AU2008200714B2 - Production of polyketides - Google Patents

Description

Australian Patents Act 1990 - Regulation 3.2A ORIGINAL COMPLETE SPECIFICATION STANDARD PATENT Invention Title "Production of polyketides" The following statement is a full description of this invention, including the best method of performing it known to us:- Production of Polyketides and Other Natural Products This is a divisional of Australian Patent Application No. 2003246965, the entire contents of which are incorporated herein by reference. Field of the Invention 5 The present invention relates to production of polyketides and other natural products and to libraries of compounds and individual novel compounds. One important area is the isolation and potential use of novel FKBP-ligand analogues and host cells that produce these compounds. The invention is particularly concerned with methods for the efficient transformation of strains that produce FKBP analogues 10 and recombinant cells in which cloned genes or gene cassettes are expressed to generate novel compounds such as polyketide (especially rapamycin) FKBP-ligand analogues, and to processes for their preparation, and to means employed therein (e.g. nucleic acids, vectors, gene cassettes and genetically modified strains). Background of the Invention 15 Rapamycin (sirolimus) (Figure 1) is a lipophilic macrolide produced by Streptomyces hygroscopicus NRRL 5491 (Sehgal et al., 1975; Vezina et at., 1975; U.S. Patent No. 3,929,992; U.S. Patent No. 3,993,749) with a 1,2,3-tricarbonyl moiety linked to a pipecolic acid lactone (Paiva et at., 1991). Other related macrolides (Figure 2) include FK506 (tacrolimus) (Schreiber and Crabtree, 1992), FK520 20 (ascomycin or immunomycin) (Wu et at., 2000), FK525 (Hatanaka H, et at., 1989, FK523 (Hatanaka, H., et at., 1988), antascomicins (Fehr, T., et al., 1996) and meridamycin (Salituro et at., 1995). For the purpose of this invention rapamycin is described by the numbering convention of McAlpine et at. (1991) in preference to the numbering conventions of Findlay et at. (1980) or Chemical Abstracts (1 1 * 25 Cumulative Index, 1982-1986 p60719CS). The versatile mode of action of rapamycin demonstrates the pharmacological value of the compound and emphasizes the necessity to isolate novel derivatives of the drug. Rapamycin shows moderate antifungal activity, mainly against Candida species but also against filamentous fungi (Baker et at., 1978; Sehgal et at., 1975; Vezina et 30 al., 1975; U.S. Patent No. 3,929,992; U.S. Patent No. 3,993,749). Rapamycin inhibits cell proliferation by targeting signal transduction pathways in a variety of cell types, e.g. by inhibiting signalling pathways that allow progression from the G 1 to the S phase of the cell cycle (Kuo et at., 1992). In T cells rapamycin inhibits signalling from the IL-2 receptor and subsequent autoproliferation of the T cells resulting in 35 immunosuppression. The inhibitory effects of rapamycin are not limited to T cells, since rapamycin inhibits the proliferation of many mammalian cell types (Brunn et al., 1996). Rapamycin is, therefore, a potent immunosuppressant with established or predicted therapeutic applications in the prevention of organ allograft rejection and in the treatment of autoimmune diseases (Kahan et a., 1991). It 5 appears to cause fewer side effects than the standard anti-rejection treatments (Navia, 1996). 40-0-(2-hydroxy)ethyl-rapamycin (SDZ RAD, Certican, Everolimus) is a semi-synthetic analogue of rapamycin that shows immunosuppressive pharmacological effects (Sedrani, R. et a., 1998; U.S. 5,665,772). The clinical efficacy of the drug is presently under investigation in Phase Ill clinical trials (Kirchner 10 et al., 2000). The rapamycin ester CCI-779 (Wyeth-Ayerst) inhibits cell growth In vitro and inhibits tumour growth in vivo (Yu et al., 2001). The drug is currently in Phase Ill clinical trials. The value of rapamycin in the treatment of chronic plaque psoriasis (Kirby and Griffiths, 2001), the potential use of effects such as the stimulation of neurite outgrowth in PC12 cells (Lyons et al., 1994), the block of the proliferative 15 responses to cytokines by vascular and smooth muscle cells after mechanical injury (Gregory et al., 1993) and its role In prevention of allograft fibrosis (WaIler and Nicholson, 2001) are areas of intense research (Kahan and Camardo, 2001). Recent reports reveal that rapamycin is associated with lower incidence of cancer in organ allograft patients on long-term immunosuppressive therapy than those on other 20 immunosuppressive regimes, and that this reduced cancer incidence is due to inhibition of angiogenesis (Guba et al., 2002). It has been reported that the neurotrophic activities of immunophilin ligands are independent of their immunosuppressive activity (Steiner et a!., 1997) and that nerve growth stimulation is promoted by disruption of the mature steroid receptor complex as outlined in the 25 patent application WO01/03692. Side effects such as hyperlipidemia and thrombocytopenia as well as potential teratogenic effects have been reported (Hentges et al., 2001; Kahan and Camardo, 2001). . The polyketide backbone of rapamycin is synthesised by head-to-tail condensation of a total of seven propionate and seven acetate units to a shikimate 30 derived cyclohexane carboxylic acid starter unit (Paiva et al., 1991). The L-lysine derived imino acid, pipecolic acid, is condensed via an amide linkage onto the last acetate of the polyketide backbone (Paiva et al., 1993) and is followed by lactonisation to form the macrocycle. A 107 kb genomic region containing the biosynthetic gene cluster has been sequenced (Schwecke et a., 1995). Analysis of 35 the open reading frames revealed three large genes encoding the modular polyketide 2 synthase (PKS) (Aparicio et al., 1996; Schwecke et al., 1995). Embedded between the PKS genes lies the rapP gene encoding a protein with sequence similarity to activation domains of nonribosomal peptide synthetases and it is thought to act analogously (K~nig et al., 1997). The region encoding the PKS genes is flanked on 5 both sides by 24 additional open reading frames encoding enzymes believed to be required for the biosynthesis of rapamycin (Molndr et al., 1996). These include the following post-polyketide modification enzymes: two cytochrome P-450 monooxygenases, designated as RapJ and RapN, an associated ferredoxin RapO, and three potential SAM-dependent 0-methyltransferases Rapl, RapM and RapQ. 10 Other adjacent genes have putative roles in the regulation and the export of rapamycin (Molndr et al., 1996). The cluster also contains the gene rapL whose product RapL is proposed to catalyse the formation of the rapamycin precursor L pipecolic acid through the cyclodeamination of L-lysine (Khaw et al., 1998; Paiva et a., 1993). The introduction of a frameshift mutation into rapL gave rise to a mutant 15 unable to produce significant amounts of rapamycin and feeding of L-pipecolic acid to the growth medium restored wild-type levels of rapamycin production (Khaw et aL, 1998). The biosynthetic precursors to the cyclohexane ring of rapamycin originate from the shikimic acid pathway (Lowden et al., 1996; Lowden et a/., 2001). Other closely-related macrolides such as FK506 (tacrolimus) (Schreiber and Crabtree, 20 1992), FK520 (ascomycin or immunomycin) (Wu et al., 2000), antascomicin (Fehr, T., et al., 1996) and meridamycin (Salituro et al., 1995) share a common pharmacophore that interacts with FK506-binding proteins (FKBPs) (Figure 2). Thus rapamycin and related compounds for example, but without limitation, FK506, FK520, 'hyg', FK523, meridamycin, antascomicin, FK525 and tsukubamycin can be 25 considered "FKBP-ligands". The partial sequence of the FK506 gene cluster (Motamedi et al., 1996; Motamedi et al., 1997; Motamedi and Shaflee, 1998), the 'hyg' clster (Ruan et al., 1997) and the complete sequence of the FK520 gene cluster have been published (Wu et al., 2000; U.S. Patent No. 6,150,513). There is significant homology between genes within these clusters and the rapamycin 30 biosynthetic gene cluster and similarity in enzyme function (Motamedi et al., 1996). The pharmacologic actions of rapamycin characterised to date are believed to be mediated by the interaction with cytosolic receptors termed FKBPs or immunophilins. Immunophilins (this term is used to denote immunosuppressant binding proteins) catalyse the Isomerisation of cis and trans peptidyl-proline bonds 35 and belong to a highly conserved family of enzymes found in a wide variety of 3 organisms (Rosen and Schreiber, 1992). Two large groups of enzymes belonging to the family of immunophilins are represented by FKBPs and cyclophilins (Schreiber and Crabtree, 1992). The major intracellular rapamycin receptor in eukaryotic T-cells is FKBP12 (DiLella and Craig, 1991) and the resulting complex interacts specifically 5 with target proteins to inhibit the signal transduction cascade of the cell. FK506, an immunosuppressive agent structurally related to rapamycin, also specifically binds to FKBP12 but it effects immunosuppression through a different mechanism (Chang et al., 1991; Sigal and Dumont, 1992). Rapamycin and FK506 compete for the same binding site, thus FK506 can have an antagonistic effect with rapamycin when the 10 two drugs are used together (Cao et al., 1995). Analysis of the crystal structure of the FKBP12-rapamycin complex has identified a rapamycin-binding pharmacophore termed the 'binding domain' (Van Duyne et al., 1993) (see Figure 1). The 'binding domain' is required for the interaction with the immunophilin and consists, for both FK506 and rapamycin, of the C-1 to C-14 region including the ester linkage, the 15 pipecolinyl ring, the dicarbonyl and the hemiketal ring (see Figure 2). The interaction is characterised by many hydrophobic contacts and some hydrogen bonds including one to the hydroxyl group on the cyclohexane ring. The pipecolinyl ring (C2 to N7) makes the deepest penetration into the protein where it is surrounded by highly conserved aromatic amino acid. residues lining the hydrophobic binding cavity. Both 20 the C1 and the C8 carbonyl groups are involved in hydrogen bonding and the C9 carbonyl group protrudes into a pocket formed by three completely conserved aromatic amino acid residues (one tyrosine and two phenylalanine acid residues) in FKBP12. The domain of the immunophilin-ligand complex interacting with the target protein projects away from FKBP. 25 The target of the rapamycin-FKBP12 complex has been identified in yeast as TOR (target of rapamycin) (Alarcon et al., 1999) and the mammalian protein is known as FRAP (FKBP-rapamycin associated protein) or mTOR (mammalian target of rapamycin) (Brown et aL., 1994). These proteins show significant similarity to the phosphotransferase domains of phosphatidylinositol 3- kinases and the observation 30 that a point mutation in the FKBP12-rapamycin binding domain (FRB) of mTOR abolishes mTOR kinase activity provides evidence for the involvement of FRB in the function of the kinase domain (Vilella-Bach et aL., 1999). The crystal structure of FKBP12-rapamycin with a truncated form of mTOR containing the FRB domain (Chen et al., 1995) has been obtained thus defining the 'effector' domain of 35 rapamycin (Choi et al., 1996; Liang et al., 1999). The analysis of the crystal structure 4 revealed that protein-protein contacts are relatively limited compared to the interaction between rapamycin and each protein. No hydrogen bonds .between rapamycin and FRB were identified. Interaction is concentrated in a series of hydrophobic contacts between the triene region of rapamycin and mainly aromatic 5 residues of FRB (Liang et al., 1999). The most deeply buried atom of rapamycin is the methyl attached to C23 (see Figure 2). The C23 to C34 region and the cyclohexyl ring of rapamycin make superficial hydrophobic contacts with FRB. A small conformational change in rapamycin was evident between the binary and the ternary complexes (Liang et al., 1999). 10 Divergences between the biological effects of C16 methoxy group rapamycin analogues and their ability to bind FKBP12 were detected and the location of the C16 substituents at the interfacial space between FKBP12 and mTOR was postulated (Luengo et al., 1995). The analysis of the crystal structure of FKBP12 with the non immunosuppressive 28-0-methyl rapamycin revealed a significant difference in the 15 orientation of the cyclohexyl ring which may result in disruption of mTOR binding (Kallen et al., 1996). Rapamycin impacts signalling cascades within the cell through the inhibition of the p70sw kinase, a serine/threonine kinase in higher eukaryotes which phosphorylates the ribosomal protein S6 (Ferrari et al., 1993; Kuo et a., 1992). The 20 S6 protein is located in the ribosomal 40S subunit and it is believed to be an important functional site involved in tRNA and mRNA binding. A regulatory function for mRNA translation through S6 phosphorylation by p 70 sk has been postulated (Kawasome et al., 1998). Rapamycin inhibits protein synthesis through its effect on other growth related events, including the activity of cyclin-dependent kinases, 25 phosphorylation of cAMP-responsive element modulator (CREM) and phosphorylation of the elongation factor binding protein 4E-BR1 (PHAS1) (Hung et al, 1995). The drug induces the accumulation of the dephosphorylated species of 4E-BP1 that binds to the translation initiation factor elF-4E, thus, suppressing translation initiation of cap-dependent mRNAs (Hara et a., 1997; Raught et a., 30 2001). A link between mTOR signalling and localized protein synthesis in neurons; the effect on the phosphorylation state of proteins involved in translational control; the abundance of components of the translation machinery at the transcriptional and translational levels; control of amino acid permease activity and the coordination of 35 the transcription of many enzymes involved in metabolic pathways have been 5 described (Raught et al., 2001). Rapamycin sensitive signalling pathways also appear to play an important role in embryonic brain development, leading and memory formation (Tang et a., 2002). Research on TOR proteins in yeast also revealed their roles in modulating nutrient-sensitive signalling pathways (Hardwick et 5 al., 1999). Similarly, mTOR has been identified as a direct target for the action of protein kinase B and of having a key role in insulin signalling (Shepherd et al., 1998; Nave et al, 1999). Mammalian TOR has also been implicated in the polarization of the actin cytoskeleton and the regulation of translational initiation (Alarcon et a/., 1999). Phophatidylinositol 3-kinases, such as motor, are functional in several 10 aspects of the pathogenesis of tumours such as cell-cycle progression, adhesion, cell survival and angiogenesis (Roymans and Slegers, 2001). Most immunophilins do not appear to be directly involved in immunosuppressive activities and relatively little is known concerning their natural ligands although candidates for natural ligands of the FKBPs termed FKBP 15 associated proteins (FAP) such as FAP48 and FAP1 have been reported. The specific interaction of FAPs with FKBPs during the formation of complexes was prevented by rapamycin in a dose-dependent manner (Chambraud et a., 1996; Kunz et a., 2000). Immunophilins appear to function in a wide range of cellular activities such as protein folding; assembly and trafficking of proteins; co- regulation of 20 molecular complexes including heat shock proteins; steroid receptors; ion channels; cell-to-cell interactions and transcription and translation of genes (Galat 2000; Hamilton and Steiner 1998). All immunophilins possess the protein folding property of peptidyl-prolyl cis-trans isomerisation and several immunophilins are found located in the endoplasmic reticulum, a principal site of protein synthesis in the cell. In 25 addition to FKBP12 (U.S. 5,109,112) other immunophilins include FKBP12.6 (U.S. 5,457,182), FKBP13 (Hendrickson et a., 1993; U.S. 5,498,597), FKBP25 (Hung and Schreiber, 1992; Jin et a., 1992), FKBP14.6 (U.S. 5,354,845), FKBP52 (U.S. 5,763,590), FKBP60 (Yem et a., 1992) and FKBP65 (Patterson et a., 2000). The multitude of the FKBP's which are present in different cell types also 30 underline the utility of isolating novel FKBP-ligand analogues with potentially changed binding and/or effector domains. Pharmacokinetic studies of rapamycin and rapamycin analogues have demonstrated the need for the development of novel rapamycin compounds that may be more stable in solution, more resistant to metabolic attack and have improved bio 35 availability. Modification using chemically available positions on the molecule has 6 . been addressed, however, this approach has limited utility as the sites available for chemical modification are limited and there is less ability to selectively modify a particular position. Biological approaches to producing novel rapamycin analogues have been less successful due to the difficulties encountered in working with the 5 organism (Lomovskaya et al., 1997; Kieser et al., 2000) despite the availability of the sequence of the biosynthetic gene cluster of rapamycin from S. hygroscopicus (Schwecke et al., 1995). A range of synthesised rapamycin analogues using the chemically available sites of the molecule has been reported. The description of the following compounds 10 was adapted to the numbering system of the rapamycin molecule described in Figure 1. Chemically available sites on the molecule for derivatisation or replacement include C40 and C28 hydroxyl groups (e.g. U.S. 5,665,772; U.S. 5,362,718), C39 and C16 methoxy groups (e.g. W096/41807; U.S. 5,728,710), C32, C26 and C9 keto groups (e.g. U.S. 5,378,836; U.S. 5,138,051; U.S. 5,665,772). Hydrogenation at 15 C17, C19 and/or C21, targeting the triene, resulted in retention of antifungal activity but loss of immunosuppression (e.g. U.S. 5,391,730; U.S. 5,023,262). Significant improvements in. the stability of the molecule (e.g. formation of oximes at C32, C40 and/or C28, U.S. 5,563,145, U.S. 5,446,048), resistance to metabolic attack (e.g. U.S. 5,912,253), bioavailability (e.g. U.S. 5,221,670; U.S. 5,955,457; W098/04279) 20 and the production of prodrugs (e.g. U.S. 6,015,815; U.S. 5,432,183) have been achieved through derivatisation. However, chemical modification requires significant quantities of rapamycin template and, as a base and acid labile compound, it is difficult to work with. Where chemical derivatisation can be group selective, it is often difficult to be site selective. Consequently, chemical modification invariably requires 25 multiple protective and deprotecive steps and produces mixed products in variable yields. The isolation of rapamycin analogues using biological methods such as biotransformation and phage-based genetic modification has also been described. Isolation of minor metabolites from both mutant strains and rapamycin producing 30 strains has provided small quantities of a number of rapamycin analogues. These strains are often low yielding and produce mixtures of rapamycin analogues. The isolation of 27-O-desmethylrapamycin and 27-desmethoxyrapamycin was reported from the culture supernatant of S. hygroscopicus NCIMB 40319 (Box et al., 1995). The antifungal activity of 27-0-desmethylrapamycin was lower than that of rapamycin 35 but the inhibition of FKBP12 PPlase activity seemed to be increased. The inhibition 7 of ConA-stimulated proliferation of murine splenic T cells and the inhibition of LPS stimulated proliferation of murine splenic B cells was decreased when compared to rapamycin (Box et a/., 1995). Similarly, antifungal activities of the rapamycin derivatives prolylrapamycin, 2 7-0-desmethylrapamycin and 27 5 desmethoxyrapamycin were lower than that of rapamycin (Wong et al., 1998). Rapamycin analogues (16-0-desmethylrapamycin, 27-0-desmethylrapamycin, 39-0 desmethylrapamycin, 16,27-0-bisdesmethylrapamycin, prolylrapamycin, 26-0 desmethylprolylrapamycin, 9-deoxorapamycin, 27-desmethoxyrapamycin, 27 desmethoxy-39-0-desmethyrapamycin, 9-deoxo-27-desmethoxyrapamycin, 28 10 dehydrorapamycin, 9-deoxo-27-desmethoxy-39-0-desmethylrapamycin) were also isolated from Actinoplanes sp N902-109 after the addition of cytochrome P450 inhibitors and/or precursor feeding to the culture or after biotransformation of isolated rapamycin (Nishida et al., 1995). The use of such inhibitors, however, only allows the targeting of a particular enzyme function and is not site selective. Rational 15 production of a single selected analogue is not possible via this method. The resulting production of mixtures of rapamycin analogues rather than a single desired product also impacts yield. The mixed lymphocyte. reaction (MLR) Inhibitory activity of the compounds was assessed and little effect on the activity was detected after the loss of the methyl group at C27 or/and C16. In addition, 9-deoxorapamycin showed 20 a more significant decrease in activity and the loss of the methoxy group at C27, the hydroxy group at C28 and the substitution of a pipecolinyl group for a prolyl group resulted in a reduction in potency (Nishida et al., 1995). Similarly, biotransformation of rapamycin and the isolation of 16,39-0-bisdesmethylrapamycin have been reported (WO 94/09010). The retention of inhibitory activity in cell proliferation 25 assays with compounds modified in the cyclohexyl ring, e.g. 39-0 desmethylrapamycin and C40 modifications such as SDZ RAD, identify this region of the molecule as a target for the generation of novel rapamycin analogues. Novel rapamycin analogues were reported after feeding cyclohexanecarboxylic acid, cycloheptanecarboxylic acid, cyclohex-1-enecarboxylic acid, 3 30 methylcyclohexanecarboxylic acid, cyclohex-3-enecarboxylic acid, 3 hydroxycyclohex-4-enecarboxylic acid and cyclohept-1-enecarboxylic acid to cultures of S. hygroscopicus thus demonstrating the flexibility in the loading module of the rapamycin polyketide synthase (P.A.S. Lowden, PhD dissertation, University of Cambridge, 1997). These novel rapamycin analogues were produced in competition 8 with the natural starter, 4, 5-dihydroxycyclohex-1-enecarboxylic acid, resulting in reduced yields and mixed products. The isolation of recombinant S. hygroscopicus strains producing various rapamycin analogues, using biological methods mediated by phage technology 5 (Lomovskaya et aL., 1997), has been reported. In the presence of added proline derivatives, a S. hygroscopicus rapL deletion mutant synthesized the novel rapamycin analogues prolylrapamycin, 4-hydroxyprolylrapamycin and 4 hydroxyprolyl-26-desmethoxy-rapamycin (Khaw et al., 1998). Similarly, the novel rapamycins 3-hydroxy-prolyl-rapamycin, 3-hydroxy-prolyl-26-desmethoxy-rapamycin, 10 and trans-3-aza-bicyclo[3,1,0]hexane-2-carboxylic acid rapamycin have been identified as described In W098/54308. The activity of prolylrapamycin and 4 hydroxyprolyl-26-desmethoxy-rapamycin was assessed in proliferation assays and the inhibitory activity of the latter compound was significantly less than that of rapamycin (Khaw et al., 1998). The deletion of five contiguous genes, rapQONML 15 (responsible for post-polyketide modifications at C16, C27 and production of L pipecolic acid) and their replacement with a neomycin resistance marker in S. hygroscopicus ATCC29253 using phage-based methology resulted in the production of 16-O-desmethyl-27-desmethoxyrapamycin when fed with pipecolic acid (Chung et a/., 2001). No complementation of this deletion mutant has been demonstrated using 20 this technology. Furthermore, the site-specific functionality of rapM and rapQ remains unclear; therefore, rational design of rapamycin analogues requiring methylation at C16-OH or C27-OH has not been enabled. The phage-based methodology suffers from a number of drawbacks as described in more detail below. It offers a.difficult and protracted process of obtaining engineered strains and has a 25 reduced versatility in comparison to the methodology disclosed within this current patent Conventional approaches to manipulate rapamycin modifying genes using biological methods comprise the mutation or deletion of individual genes in the chromosome of a host strain or/and the insertion of individual genes as extra copies 30 of homologous or heterologous genes either individually or as gene cassettes (WO01/79520, WO 03/048375). However, the isolation of novel rapamycin analogues using such biological methods has been limited due to the difficulties in transforming the rapamycin-producing organism S. hygroscopicus. It has been reported that the commonly used methods of transformation with plasmid DNA or 35 conjugal transfer were unsuccessful with the rapamycin producing strain (Lomovskya 9 - et al., 1997, Schweke et a!., 1995, Kieser et a., 2000). The current state of the art uses the methodology of Lomovskya et al. (1997), a work intensive phage based method that is severely limited by the size of the cloned DNA fragments transferred into S. hygroscopicus (Kieser et a/., 2000). This technology is limited to the transfer 5 of a maximum of 6.4 kb of cloned DNA. Thus, when complementing a deletion mutant using this technology the artisan is limited to the inclusion of -2 functional genes in addition to desired promoter, regions of homology and resistance marker. The genetic information for the rapamycin biosynthetic gene cluster has been available since 1995 (Schwecke et al., 1995), however, limited progress in this area 10 has been made (Khaw et al., 1998; Chung et a., 2001; WO01/34816). Summary of the Invention The present invention provides recombinant methods for the efficient transformation of strains that contain a biosynthetic cluster encoding an FKBP ligand, 15 for example but without limitation Streptomyces hygroscopicus subsp. hygroscopicus NRRL 5491, Actinoplanes sp. N902-1 09 FERM BP-3832, Streptomyces sp. AA6554, Streptomyces hygroscopicus var. ascomyceticus MA 6475 ATCC 14891, Streptomyces hygroscopicus var. ascomyceticus MA 6678 ATCC 55087, Streptomyces hygroscopicus var. ascomyceticus MA 6674, Streptomyces 20 hygroscopicus var. ascomyceticus ATCC 55276, Streptomyces tsukubaensis No.9993 FERM BP-927, Streptomyces hygroscopicus subsp. yakushimaensis, Streptomyces sp. DSM 4137, Streptomyces sp. DSM 7348, Micromonospora n.sp. A92-306401 DSM 8429, Steptomyces sp. MA 6858 ATCC 55098, Steptomyces sp. MA 6848, said methods comprising: 25 (a) constructing a conjugative deletion plasmid in an E. coli strain that is dam , dcm or dam and dcm . (b) generation of spores from said strain suitable for conjugation wherein said strain is grown at a humidity of between 10% and 40% and the spores are harvested at between 5 and 30 days; 30 (c) . conjugating the E. col strain of step (a) with the spores from step (b) on a medium that comprises per litre: i) 0.5g to 5g corn steep powder, ii) 0.1 g to 5g Yeast extract, iii) 0.1g to 10g calcium carbonate; and 35 iv) 0.01g to 0.5 g iron sulphate; said media additionally containing BACTO-agar and starch and having been 10 dried to result in 1-20% weight loss; and (d) optionally culturing the strain under conditions suitable for polyketide production. In a preferred embodiment the methods are used for the transformation of 5 Streptomyces hygroscopicus subsp. hygroscopicus (e.g. NRRL 5491), Actinoplanes sp. N902-109 (e.g. FERM BP-3832), Streptomyces sp. AA6554, Streptomyces hygroscopicus var. ascomyceticus (e.g. MA 6475 ATCC 14891), Streptomyces hygroscopicus var. ascomyceticus (e.g. MA 6678 ATCC 55087), Streptomyces hygroscopicus var. ascomyceticus (e.g.MA 6674), Streptomyces hygroscopicus var. 10 ascomyceticus (e.g. ATCC 55276), Streptomyces tsukubaensis No.9993 (e.g. FERM BP-927), Streptomyces hygroscopicus subsp. yakushimaensis, Streptomyces sp. (e.g. DSM 4137), Streptomyces sp. (e.g. DSM 7348), Micromonospora n.sp. A92 306401 (e.g. DSM 8429) or Streptomyces sp. (e.g. MA 6858 ATCC 55098). In a more preferred embodiment the methods are used for the transformation of: S. 15 hygroscopicus subsp. hygroscopicus (e.g. NRRL 5491) or S. hygroscopicus var. ascomycpticus (e.g. ATCC 14891). In a'still more highly preferred embodiment the methods are used for the transformation of the rapamycin producer S hygroscopicus subsp. hygroscopicus (e.g. NRRL 5491). Therefore the present invention also provides a recombinant strain that 20 contains biosynthetic clusters that encode FKBP-ligands where one or more auxiliary genes have been deleted or inactivated using the methods as described herein. In a further aspect, the present invention provides recombinant methods and materials for expressing combinations of polyketide modification enzymes so as to produce novel polyketide analogues. In a specific embodiment, the present invention 25 provides recombinant methods and materials for expressing the combinations of enzymes responsible for post-PKS modification and/or precursor supply from biosynthetic clusters that encode FKBP-ligands for example but without limitation rapamycin, FK506, FK520, FK523, FK525, antascomicin, meridamycin, tsukubamycin and analogues therof and methods for the production of analogues in 30 recombinant host cells. In a preferred embodiment the recombinant methods and materials are used for expressing the combinations of enzymes responsible for post PKS modification and/or precursor supply in the biosynthesis of rapamycin, FK520, FK506 and 'hyg' and methods for the production of rapamycin, FK520, FK506 and 'hyg' analogues In recombinant host cells. In a more highly preferred embodiment 35 the recombinant methods and materials are used for expressing the combinations of 11 enzymes responsible for post-PKS modification and/or precursor supply in the biosynthesis of rapamycin and methods for the production of rapamycin analogues in recombinant host cells. Broadly, the present invention is concerned with the alteration of a gene 5 system which has a core portion responsible for the production of a basic product, and a multiplicity of modifying genes responsible for effecting relatively small modifications to the basic product - e.g. effecting glycosylation, oxidation, reduction, alkylation, dealkylation, acylation or cyclisation of the basic product, and a multiplicity of precursor supply genes which are involved in the production of particular precursor 10 compounds (e.g. pipecolate; 4,5 dihydroxycyclohex-1-ene carboxylic acid). Thus the basic product may be a modular polyketide and the modifying genes may be concerned with glycosylation and/or other modifications of a polyketide chain, and the precursor supply genes may be involved in the production and/or incorporation of natural or non-natural precursors (e.g. pipecolate and/or 4,5 dihydroxycyclohex-1 15 ene carboxylic acid in the rapamycin system). The core portion may not function properly or even at all in the absence of a precursor supply gene (unless a. natural or unnatural precursor compound is supplied or is otherwise available). In one aspect the invention provides methods for the alteration of a gene 20 system with a core portion that cannot function due to a deletion or inactivation of a precursor supply gene. Suitable gene systems include, but are not limited to, the rapamycin, antascomicin, FK520, FK506, 'hyg', FK523, meridamycin, FK525 and tsukubamycin biosynthetic clusters. In this aspect of the invention, the precursor supply gene lacking is preferably rapK or a homologue of rapK (e.g. fkbO in the 25 FK506 or FK520 gene clusters). The gene system is preferably the rapamycin - cluster. The precursor supply gene lacking is more preferably rapK. This aspect of the invention provides methods for the efficient production of a multiplicity of basic products through the incorporation of natural or non-natural precursors (e.g. 4,5 dihydroxycyclohex-1 -ene carboxylic acid). Methods may also embody further 30 aspects as set out below. Another type of system is a non-ribosomal peptide ("NRP") system where the basic product is a peptide and the modifying genes are genes responsible for modifications to a peptide (glycosylation, reduction etc), and the precursor supply genes are genes involved in the production of unusual amino acid residues to be 35 incorporated in the peptide. Systems can also be of mixed type, e.g. having a 12 polyketide part and a part with a different biosynthetic origin, e.g. NRP. Indeed, rapamycin can be regarded as an example of this since the pipecolate residue is an amino acid residue added by an enzyme similar to ones found in NRP systems. These modifying genes and precursor supply genes may be regarded as 5 "auxiliary genes" for polyketide synthesis and the term "auxiliary genes" as used herein may refer to modifying genes, precursor supply genes or both. The alteration of the gene system involves the creation of a functioning altered system in which the set of auxiliary genes has been altered. Thus one or more auxiliary genes (and preferably two or more, three or more, four or more, five or 10 more, six or more or seven or more) may have been deleted (or rendered non functional) and/or replaced by different genes. This may involve a "deletion system" comprising nucleic acid encoding a gene system lacking a multiplicity of functional auxiliary genes. This deletion system can then be complemented with one or more functional auxiliary genes (which may 15 be the same as or different from the genes they replace). This can be carried out combinatorially, a deletion system being complemented by a multiplicity of different genes and sets of genes. An altered system which differs from the natural system in lacking one or more modifying functions could be produced (a) by producing a deletion system and 20 restoring by complementation less than all of the deleted genes; or (b) by selectively deleting or inactivating genes of an existing system. In an altered system produced according to (b) genes may be inactivated by site-directed mutagenesis of an active site important in the protein function (active site point mutation), by truncation of the gene through a frameshift mutation, by an in-frame deletion of a section of the gene 25 important to its function, such as an active site; partial deletion or inactivation by point mutation. These could all be carried out by double recombination and selecting for the mutant genotype, or by single recombination. In a preferred embodiment the altered system is produced by method (a). Such methods could also be used In producing a deletion system. The "complementation" approach (a) is preferably 30 homologous, in that the "restored" genes are from the same gene cluster, however, heterologous complementation, wherein the "restored" genes are selected from a different biosynthetic cluster that encodes FKBP-ligands, is also contemplated by the present invention. In a preferred embodiment the "restored" genes are essentially the same as the deleted genes, or are variants thereof, which perform similar 35 functions. 13 In a further aspect of the invention, an altered system with a deleted (or non functional) precursor supply gene can be fed with alternative precursors so that it produces variant products. As applied to a polyketide synthase ("PKS") system, one preferred type of 5 embodiment is a method for producing polyketides comprising: (a) providing a strain of an organism which contains one or more PKS genes expressible to produce a functioning PKS which can generate a polyketide in the organism, for example PKS genes that encode a FKBP-ligand, the organism lacking one or more (and preferably a plurality) of functional auxiliary genes naturally associated with said PKS genes 10 which encode gene products capable of effecting respective modifications of the polyketide; and (b) effecting complementation by causing said organism to express one or more auxiliary genes, the expressed modifying genes constituting an incomplete set of auxiliary genes naturally associated with said PKS genes and/or comprising one or more variant auxiliary genes; and (c) culturing said strain and 15 optionally isolating the polyketide analogues produced. The step of providing a strain of an organism containing one or more PKS genes may include a step of providing nucleic acid encoding a gene cluster comprising said one or more PKS genes and lacking said one or more auxiliary genes; and introducing said nucleic acid into the organism. 20 The PKS genes are preferably rapamycin genes. The auxiliary genes which are lacking are preferably one or more of rapK, rap, rapQ, rapM, the contiguous genes rapN and 0 (herein designated as rapNIO), rapL and rapJ. In specific embodiments contemplated by the present invention: i) one auxiliary gene is lacking, for example rapK; rap; rapQ; rapM; rapL, 25 rapNIO or rapJ is lacking; preferably where one auxiliary gene is lacking it is selected from the group consisting of rapK; rapl; repQ; rapM; rapN/O and rapJ; ii) two auxiliary genes are lacking for example: rapKrapl; rapKrapQ; rapKrapM; rapKrapN/O; rapKrapL; rapKrapJ; rapklrapQ; rapira pM; 30 raplrapN/O; raplrapL; raplrapJ; rap QrapM; rapQrapN/O; rapQrapL; rapQrapJ; rapMrapN/O; rapMrapL; rapMrapJ; rapN/OrapL; rapN/OrapJ or rapLrapJ are lacking; iii) three auxiliary genes are lacking for example: rapKraplrapQ; rapKrapirapM; rapKrapirapN/O; rapKraplrapL; rapKraprapJ; 35 rapKrapQrapM; rapKrapQRapN/O; rapKrapQrapL; rapKrapQrapJ; 14 rapKrapMrapN/O,' rapKrapMrapL;* rapKrapMrapJ;, rapKrapN/rapL; rapKrapN/OrapJ, rapKrapLrapd; raplrapQrapM; raplrapQrapN/O; raplrapQrapL; raplrapQrapJ; raplrapMrapN/lO, raplrapMrapL; rapid rapMrapJ, raplrqpNlOrapL raplrapN/rapJ, rapfraprwpJ 5 rap QrapMrapN/O, rap QrapMrapL; rap QrapMrapJ, rap QrapN/QrapL, rap QraPN/OraPJ; rpPQraPLrapJ; rapMrapNlOrapL; rapMrapN/OrapJ; rapMraPLrap or rapAlOrqpLrapJ are lacking iv) four auxiliary genes are lacking, for example: rapKr-aplrapQr-apM; rapKraplrapQraPNlO;' rapKraplrapQrapL; rapKraplrapQrapJ; 10 rapKraplrapMrapNlO; rapKrapirapMrapL; rapKraplrapMrapJ; rapKrqplrapN/OrapL, rapKraplrapNlOrapJ, rapKraplrapLrapJ; rapKrapQrapMrapN/O; rapKr8pQrapMrapL, rapKrqpQrapMrapJ; rapKrapQrapNlOrqpL; rapK, rapQ rapN/O, rapJ;* rapKrapQrapLrapJ;' rapKrapMrapN/OrapL; rapKrapMrapW1OrapJ; rapKrapMrapLrapJ;* 15 rapKrapN/OrapLrapJ, raplrapQrapMrapN/O; raplrapQrapMrapL; rapl rap QrapMrqpJ; raplrapQrapNlOrapL; raplrapQrapN/OrapJ; raplrqpQrapLrapJ;' raplrapMrqpN/OrapL; raplrapMrapN/QrapJ; raplrapMrapLrapJ; raplrapN/OrapLrapJ, rap QrapMrapN/OrqpL; rap QrqpMrapN/OrapJ; rap QrapMrqpLrapJ; rap QrqpN/OrapLrapJ or 20 rapMrapN/OrapLrapJ are lacking;* v) five auxiliary genes are lacking; for example: rapKraplrapQrqpMrapN/O; rapKraplrapQrapMrapL;* rqpKraplrapQrapMrapJ; rqpKraplrqpQrapWlOrapL; rapKraplrapQrqp N/OrapJ, rqpKraplrapQrapLrapJ, rapKrqplrapMrapN/OrapL; 25 rapKraplrapMrapWlOrapJ, rapKraplrapMrapLrapJ; rapKraplrapWlOrqpLrapi; rapKrapQrapvrapN/OrqpL, -rapKrqpQrapMrqpWlOrapJ, rqpKrapQrapMrapLrapJ, rapKrapQrapN/OrapLrapJ; rapKrapMrapN/OrapLrapJ; raplrapQrapMrapN/OrapL, raplrapQrapMrapN/OrapJ, 30 raplrapQrqpN/OrapLrapJ; raplrapMrapN/OrapLrapJ; rap QrapMrapN/OrapLrqpJ or raplrapQrapMrapLrapJ are lacking; vi) six auxiliary genes are lacking for example: rapKrqplrapQrapMrapN/OrapL;* rapKraplrapQrapMrapN/OrapJ;* rapKraplrapQrapMrapLrapJ; rapKraplrapQrapN/OrapLrapJ; rapKraplrapMrapN/OrapLrapJ, 15 rapKrapQrapMrapN/OrapLrapJ or raplrapQrapMrapN/OrapLrapJ are lacking; or vii) seven auxiliary genes are lacking, e.g. rapKraplrapQrapMrapN/OrapLrapJ are lacking. 5 The expression "lacking one or more functional auxiliary genes" covers both the lack of a gene and the presence of a gene but in a non-functioning state, e.g. because it has been specifically disabled. In one aspect, the invention provides a novel and expeditious route to the efficient incorporation of natural or non-natural precursors into FKBP-ligands. These 10 include, but are not limited to, the rapamycin, antascomicin, FK520, FK506, hyg', FK523, meridamycin, FK525 and tsukubamycin polyketide synthase/non-ribosomal peptide synthase systems, the invention thus provides novel analogues of their respective natural products. In specific aspect, the invention provides a novel and expeditious route to the efficient incorporation of natural or non-natural precursors 15 providing novel rapamycin analogues. Therefore in one-aspect the present invention provides a method of generating analogues of. FKBP-ligands which incorporate a non-natural starter unit, said method comprising: (a) generating a recombinant strain in which at least the rapK homologue has 20 been deleted or inactivated; and (b) feeding a non-natural starter unit to said strain In a preferred embodiment the recombinant strain is generated using the methods of the present invention. In further aspects the invention provides libraries of compounds and individual 25 compounds available using such systems. Thus a typical compound is a variant of a compound naturally produced by a gene system which has a core portion responsible for the production of a basic product, and a multiplicity of auxiliary genes responsible for effecting relatively small modifications to the basic product, the variant being producible by a system altered so-that one or more of the auxiliary. 30 genes are absent, non-functional, or replaced by functional variants. A preferred class of compounds is rapamycin analogues corresponding to products of a rapamycin system wherein one or more of the genes selected from the group consisting of rapI( rapi, rapQ, rapM, rapN, rapO, rapL and rapJ genes are absent, non-functional or variant. 16 In a further aspect, the present invention provides novel FKBP-analogues, in a preferred embodiment the present invention provides novel rapamycin analogues. Such compounds may have one or more useful properties, for example but without limitation, utility as immunosuppressants, antifungal agents, anticancer agents, 5 neuroregenerative agents, or agents for the treatment of psoriasis, rheumatoid arthritis, fibrosis and other hyperproliferative diseases. Definitions: As used herein the term "modifying gene(s)" includes the genes required for 10 post-polyketide synthase modifications of the polyketide, for example but without limitation cytochrome P-450 monooxygenases, ferredoxins and SAM-dependent 0 methyltransferases. In the rapamycin system these modifying genes include rapN/O, rapM, rapl, rapQ, and rapJ but a person of skill in the art will appreciate that PKS systems related to rapamycin (for example but without limitation: FK506, FK520, 15 antascomicin, 'hyg', FK523, meridamycin, FK525 and tsukubamycin) will have homologues of at least a subset of these genes, some of which are discussed further below. As used herein the term "precursor supply gene(s)" includes the genes required for the supply of the natural or non-natural precursors, the genes required 20 for the synthesis of any naturally or non-naturally incorporated precursors and the genes required for the incorporation of any naturally or non-naturally incorporated precursors. For example but without limitation in the rapamycin system these genes include rapL, rapK and rapP but a person of skill in the art will appreciate that PKS systems related to rapamycin (for example but without limitation: FK506, FK520, 25 antascomicin, 'hyg', FK523, meridamycin, FK525 and tsukubamycin) will have homologues of these genes, some of which are discussed further below. As used herein, the term "auxiliary gene(s)" includes references to modifying genes, precursor supply genes or both modifying genes and precursor supply genes. As used herein, the term "precursor includes the natural starter units (i.e. 30 4,5-dihydroxycyclohex-1-ene carboxylic acid), non-natural starter units, and naturally incorporated amino acids (i.e. pipecolic acid) and non-naturally incorporated amino acids As Used herein the term "non-natural starter unit" refers to any compounds which can be incorporated as a starter unit in polyketide synthesis that are not the 35 starter unit usually chosen by that PKS. 17 As used herein, the term "FKBP-ligands" refers to compounds that bind to the immunophilin FKBP, such compounds preferentially contains an a, p-diketo amide where the 0-keto is masked as an hemi-acetal. Such compounds include, without limitation, rapamycin, FK520, FK506, antascomicin, hyg', FK523, 5 merdamycin, FK525 and tsukubamycin, As used herein, the term "biosynthetic clusters that encode FKBP Ilgands" includes but is not limited to the gene clusters which direct the synthesis of rapamycin, FK506, FK520, 'hyg', FK523, antascomicin, meridamycin, FK525 and tsukubamycin. 10 As used herein the term "strains that contain biosynthetic clusters that encode FKBP-ligands" includes but is not limited to: Streptomyces hygroscopicus subsp. hygroscopicus (e.g. NRRL 5491), Actinoplanes sp. N902-109 (e.g. FERM BP 3832), Streptomyces sp. AA6554, Streptomyces hygroscopicus var. ascomyceticus MA 6475 (e.g. ATCC 14891), Streptomyces hygroscopicus var. ascomyceticus MA 15 6678 (e.g. ATCC 55087), Streptomyces hygroscopicus var. ascomyceticus MA 6674, Streptomyces hygroscopicus var. ascomyceticus (e.g. ATCC 55276), Streptomyces tsukubaensis No.9993 (e.g. FERM BP-927), Streptomyces hygroscopicus subsp. yakushimaensis, Streptomyces sp. (e.g. DSM 4137), Streptomyces sp. (e.g. DSM 7348), Micromonospora n.sp. A92-306401 (e.g. DSM 8429) or Streptomyces sp. MA 20 6858 (e.g. ATCC 55098). As used herein, the term "rapK homologue" refers to homologues of the rapamycin gene rapK from other biosynthetic clusters that encode FKBP-ligands, for example but without limitation: the fkbO gene from the FK520 cluster, the fkbO gene from the FK506 cluster and the Orf5 in the 'hyg' cluster. Such rapK homologues 25 perform the same function as rapK in the synthesis of these related FKBP-ligands, namely they are essential for the supply of the natural starter Onit. Preferably; such rapK h6mologues have at least 40% sequence identity, preferably at least 60%, at least 70%, at least 80%, at least 90% or- at least 95% sequence identity to the sequence of rapK as shown in Figure 27 (SEQ ID NO: 13). 30 Detailed Description of the Invention In one aspect, the present invention provides a novel and expeditious method for the transformation of S. hygroscopicus. The use of phage technology for the Isolation of genetically modified strains of S. hygroscopicus has previously been 35 described (Khaw et a., 1998; Lomovskaya et al., 1997). However, no method other 18 than transfection has ever been reported for the introduction of DNA into the rapamycin producing strain S. hygroscopicus. Indeed, it has been stated previously that the commonly used methods of transformation with plasmid DNA or conjugal transfer were unsuccessful with the rapamycin-producing strain (Lomovskaya et al., 5 1997, Kieser et al., 2000; Schweke et al., 1995). In the present invention, surprisingly a conjugation protocol to successfully transform S. hygroscopicus was established as described in Example 1. The methodology was exemplified by the Isolation of the deletion mutant in S. hygroscopicus MG2-10 (Example 2) and by the expression of genes and gene 10 combinations as described in Examples 3, 5 and 15. Therefore, in one aspect the present invention provides a method for producing a recombinant strain that contains biosynthetic clusters that encode FKBP ligands where one or more.auxiliary genes have been deleted or inactivated said method comprising: 15 (a) construction of a conjugative plasmid in an E. coli strain that is dam , dcm or dam and dcm; (b) generation of spores from said strain suitable for conjugation wherein said strain is grown at a humidity of between 10% and 40% and the spores are harvested at between 5 and 30 days; 20 (c) conjugating the E. co/i strain of step (a) with the spores from step (b) in a medium that comprises per litre: i) 0.5g to 5g com steep powder, ii) 0.1g to 5g Yeast extract, iii) 0.1g to 1Og calcium carbonate; and 25 iv) 0.01g to 0.5 g iron sulphate; said media additionally containing BACTO-agar and starch arid having been dried to result in 1-20% weight loss; and (d) optionally culturing the strain under conditions suitable for polyketide production. 30 Preferably the E coil strain of step (a) is dam- and dcm-. Preferably, in step (b) the spores are harvested at between 10 and 25 days or at between 14 and 21 days. In another embodiment, in step (b) the strain is grown at a humidity of between 10 and 20%. In a specific embodiment the starch in the media in step (c) used is wheat 35 starch. 19 In preferred embodiments the media used in step (c) comprises Ig to 4g corn steep powder, ig to 4g Yeast extract, 1g to 5g calcium carbonate; and 0.2g to 0.4 g iron sulphate per litre. In a more preferred embodiment the media comprises per litre: 2.5g corn steep powder, 3g Yeast extract, 3g calcium carbonate; and 0.3g iron 5 sulphate; The complementation strategy disclosed in this invention provides an expeditious method to assess and identify the function of each auxiliary gene i.e. rapK, rapQ, rapN/O, rapM, rapL, rapJ and/or rap! in rapamycin biosynthesis. The gene product RapK has previously been identified as an interesting candidate for a 10 pteridine-dependent dioxygenase that could also catalyse an oxidative step in the biosynthesis of rapamycin (Molner et al., 1996). The homologous gene fkbO was identified in the biosynthetic gene cluster of FK506 and due to the structural similarity of rapamycin and FK506 a role for rapK in the oxidation of the C9 OH group was postulated (Motamedi et al., 1996). The findings in Examples 3, 4 and 6, describing 15 the rapK-dependent production of pre-rapamycin by S. hygroscopicus MG2 10[pSGsetrapK] suggests that RapK has at least an additional function in rapamycin biosynthesis. In another aspect, therefore, the methods of the present invention led to the elucidation of the function of RapK, namely that the expression of the rapK gene is 20 essential for the accumulation of any cyclised macrolide product. In a further aspect, the present invention describes the complementation of S. hygroscopicus MG2-10 with fkbO, the homologue of rapK from the FK520 cluster, with the surprising observation of fkbO dependent production of pre-rapamycin by S. hygroscopicus MG2-10[pMG169-1] (Example 11). It can be seen by one skilled in the art that fkbO 25 fulfils a similar function in the production of FK520 as rapK and fkbO in the production of pre-rapamycin. Further, one skilled in the art will appreciate that other homologues of rapK, including but not limited to, fkbO In the FK506 cluster, fkbO in the FK520 cluster and Orf5 in the 'hyg' cluster also fulfil the same function. In a further aspect of the invention, homologues of rapK in biosynthetic clusters that 30 encode FKBP-ligands, including, but not limited to, FK506, FK520, FK525, antascomicin, FK523, tsukubamycin, and 'hyg' can be deleted or inactivated, providing strains unable to make their respective known natural products. Similarly, the complementation strategy outlined above provides an expeditious method to investigate the function, specificity and order for the expressed products of auxiliary 35 genes in the biosynthesis of other polyketides or non-ribosomal peptides. 20 In a preferred class of embodiment, the present invention provides a method for the production of a recombinant host strain capable of producing rapamycin analogues, further involving the construction of genomic deletions, including but not limited to rapQONMLKJI introduced into S. hygroscopicus and complementation or 5 partial complementation by expressing single genes or combinations of genes, including but not limited to rapK, rapt, rapQ, rapM, the contiguous genes rapN and 0 (herein designated as rapN/O), rapL and rapJ, in gene cassettes. Further, the invention provides a method of producing said rapamycin analogues by culturing said recombinant host strain, and optionally isolating the rapamycin analogues produced. 10 Thus, the recombinant strain MG2-10[pSGsetrapK], produced by complementation of the genomic deletion strain S. hygroscopicus MG2-1 0, with rapK, was cultured to produce 9-deoxo-16-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin (pre rapamycin). In a further aspect of this class of the invention, the strategy involves the 15 integration of a vector comprising a sub-set of genes including, but not limited to, rapK, rapl, rapQ, rapM, rapN, rapO, rapL and rapJ into the S. hygroscopicus deletion mutant above. Such. integration may be performed using a variety of available integration functions including but not limited to: OC31-based vectors, vectors based on pSAM2 integrase (e.g. In pPM927 (Smovkina et al., 1990)), R4 integrase (e.g. in 20 pAT98 (Matsuura et al., 1996)), $VWNB integrase (e.g. in pKT02 (Van Mellaert et al., 1998)), OBT1 integrase ((e.g. pRT801) Gregory et al., in press) and L5 integrase (e.g. Lee et aL., 1991). In some cases this may need alteration of the host strain by addition of the specific attB site for the integrase to enable high efficiency integration. Replicating vectors could also be used, either as replacements to, or in addition to 25 PC31-based vectors. These include, but are not limited to, vectors based on plJ101 (e.g. piJ487, Kieser et al., 2000), pSG5 (e.g. pKC1 139, Bierman et al., 1992) and SCP2* Te.g. plJ698, Kieser et a/., 2000). This methodology has been exemplified herein by the use of the OBTI and OC31 site-specific integration functions. Although the introduction of gene cassettes into S. hygroscoplcus has been 30 exemplified in the present invention using the dIBT1 and the OC31 site-specific integration functions, those skilled in the art will appreciate that there are a number of different strategies described in the literature, including those mentioned above that could also be used to introduce such gene cassettes into prokaryotic, or more preferably actinomycete, host strains. These include the use of alternative site 35 specific integration vectors as described above and in the following articles (Kieser et 21 al., 2000; Van Mellaert et al., 1998; Lee et al., 1991; Smovkina et al., 1990; Matsuura et al., 1996). Alternatively, plasmids containing the gene cassettes may be integrated into a neutral site on the chromosome using homologous recombination sites. Further, for a number of actinomycete host strains, including S. hygroscopicus, 5 the gene cassettes may be introduced on self-replicating plasmids (Kieser et al., 2000; W098/01571). In a further aspect of this class, the invention provides gene cassettes for the complementation of the recombinant S. hygroscopicus deletion strains. Methods of constructing gene cassettes and their heterologous use to produce hybrid 10 glycosylated macrolides have been previously described (Gaisser et al., 2002; WO01/79520, WO 03/048375). The cloning method used to isolate the gene cassettes of the present invention differs significantly from the approach previously described in that the gene cassette is assembled directly in an expression vector rather than pre-assembling the genes in pUCI 8/19- plasmids, thus providing a more 15 rapid cloning procedure. The approach is exemplified as described in Example 3, 4, 5, 9 and 15. As described herein, a suitable vector (for example but without limitation pSGUt1) can be constructed for use in the construction of said gene cassettes, where a suitable restriction site (for example but without limitation Xbal), sensitive to dam methylation is inserted 5' to the gene(s) of interest and a second restriction site 20 (for example Xbal) can be inserted 3' to the genes of interest. The skilled artisan will appreciate that other restriction sites may be used as an alternative to Xbal and that the methylation sensitive site may be 5' or 3' of the gene(s) of interest. The use of gene cassettes enables the rapid and parallel generation of multiple recombinant strains deleted in any combination of modifying genes from a 25 single S. hygroscopicus deletion strain. The cloning strategy facilitates the assembly of a library of gene cassettes in either a directed or random manner, and is therefore a powefful tool for the combinatorial production of novel rapamycin analogues including but not exclusively limited to 9-deoxo-1 6-0-desmethyl-27-desmethoxy-39 O-desmethyl-rapamycin (pre-rapamycin), 9-deoxo-16-0-desmethyl-27-0-desmethyl 30 39-0-desmethyl-rapamycin, 16-O-desmethyl-27-desmethoxy-39-0-desmethyl rapamycin, 9-deoxo-16-0-desmethyl-39-0-desmethyl-rapamycin , 9-deoxo-16-0 desmethyl-27-desmethoxy-rapamycin , 1 6-0-desmethyl-27-0-desmethyl-39-0 desmethyl-rapamycin , 9-deoxo-27-0-desmethyl-39-0-desmethyl-rapamycin ; 9 deoxo-16-0-desmethyl-27-0-desmethyl-rapamyci n , 27-0-desmethyl-39-0 35 desmethyl-rapamycin , 9-deoxo-16-0-desmethyl-rapamycin , 9-deoxo-39-0 22 desmethyl-rapamycin , 8-deoxo-1 S-0-desmethyl-26-desmethoxy-38-O-desmethyl prolylrapamycin (pre-prolyirapamycin), 8-deoxo-1 5 -- desmethyl-26-O-desmethyl-38 0-desmethyl-prolylrapamycin , 1 5 -O-desmethyl-26-desmethoxy-38-o-desmethyl prolyirapamycin, 8 -deoxo- 26 -desmethoxy-38--desmethyproyrapamycn , 8 5 deoxo-1 5 -O-desmethyl-38-O-desmethyl-prolylrapamycin, 8-deoxo-1 5-0-desmethyl 26-desmethoxy-prolylrapamycin, 1 5-Q-desmethyl-26-O-desmethyl-38-o-desmethyl. prolyirapamycin, 8 -deoxo- 26 -O-desmethy-3--desmethyl-proylrapamycin , 8 deoxo-1 5-O-desmethyl-26-O-desmethyl-prolylrapamycin, I 5-O-desmethyl-38-O desmethy-prolyirapamycin , I S-O-desmethyl-26-O-desmethyl-prolylrapamycin, 15 10 O-desmethyl-26-desmethoxy-prolylrapamycin , 26-desmethoxy-38-O-desmethyl prolyirapamycin , 26-O-desmethyl-38-O-desmethyl-prolylrapamycin , 8-deoxo-1 5-0 desmethyl-prolyirapamycin, 8-deoxo-26-O-desmethyl-prolylrapamycin , 8-deoxo-38 0-desmethyl-prolylrapamycin, I 5-O-desmethyl-prolylrapamycin , 38-0-desmethyl prolyirapamycin , 9-deoxo-1 6-0-desmethyl-27-desmethoxy-39-desmethoxy 15 rapamycin, 9-deoxo-1 6-O-desmethyl-27-0-desmethyl-39-desmethoxy.rapamycin, I G-Q-desmethyl-27-desmethoxy-39-desmethoxy-rapamycin, 9-deoxo-27 desmethoxy-39-desmethoxy-rapamycin , 9-deoxo-1 6-0-desmethyl-39-desmethoxy rapamycin, I 6-0-desmethyl-27-O-desmethy-39-iesmethoxy-rapamycn , 9-deoxo 27-0-desmethyl-39-desmethoxy-rapamyctn, I6-O-desmethyl-39-desmethoxy 20 rapamycin, 27-desmethoxy-39-desmethoxy-rapamycin , 27-O-desmethyl-39 desmethoxy-rapamycin, 9-deoxo-39-desmethoxy-rapamycin , 8-deoxo-15-0 desmethyl-26-desmethoxy-38-desmethoxy-prolylrapamycin, 8-deoxo-1 5-0 desmethyl-26-0-desmethyl-38-desmethoxy-prolylrapamycin, 1 5-0-desmethyt-26 desmethoxy-38-desmethoxy-proylrapamycin, 8-deoxo-26-desmethoxy-38 25 desmethoxy-prolylrapamycin , 8-deoxo-1 5-O-desmethyl-38-desmethoxy prolyirapamycin, I 5-O-desmethyl-26-0-desmethyl-38-desmefioxy-prolylrapamycin , 8-deox&26-0-desmethyl-38-desmethoxy-prolylrapamycin, 1 5-0-desmethyl-38 desmethoxy-prolyrapamycin , 26-desmethoxy-38-desmethoxy-prolylrapamycjn , 26 0-desmethyl-38-desmethoxy-prolylrapamycin , 8-deoxo)-38-desmethoxy 30 prolylrapamycin , 38-desmethoxy-prolyirapamycin, 9-deoxo-1 6-0-desmethyl-27 desmethoxy-36-de(3-cis-methoxy-4-trans-hydroxycyclohexyl)-36 (hydroxycyclohexenyl) rapamycin, 9-deoxo-1 6-O-desmethyl-27-desmethoxy-36-de(3 cis-methoxy-4-trans-hydroxycyclohexyl)-36-(dihydroxy cyclohexyl) rapamycin, 9 deoxo-1 6-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans 35 hydroxycyclohexyl)-36-(hydroxynorbornyl) rapamycin, 9-deoxo-1 6-0-desmethy-27 23 desmethoxy-36-de(3-cis-methoxy-4-trans-hydroxycyclohexyl)-36-(3-methyl- 4 hydroxycyclohexyl) rapamycin, 9-deoxo-16-0-desmethyl-27-desmethoxy-36-de(3 cis-methoxy-4-trans-hydroxycyclohexyl)-36-(4-methy hydroxycyclohexyl) rapamycin, 9-deoxo-1 6-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans 5 hydroxycyclohexyl)-36-(3-fluoro-4-hydroxycyclohexyl) rapamycin, 9-deoxo-16-0 desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans-hydroxycyclohexyl)-36-(3 hydroxy-4-fluorocyclohexyl) rapamycin, 9-deoxo-16-0-desmethyl-27-desmethoxy-36 de(3-cis-methoxy-4-trans-hydroxycyclohexyl)-36-(3-chloro-4-hydroxycyclohexyl) rapamycin, 9-deoxo-16-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans 10 hydroxycyclohexyl)-36-(3-hydroxy-4-chlorocyclohexyl) rapamycin, 9-deoxo-16-0 desmethyl-27-desmethoxy-36-de(3-cis-methoky-4-trans-hydroxycyclohexyl)-36-( 3 cis-4-cis-dihydroxycyclohexyl) rapamycin, 9-deoxo-16-0-desmethyl-27-desmethoxy 36-de(3-cis-methoxy-4-trans-hydroxycyclohexyl)-36-(3-trans-4-trans dihydroxycyclohexyl) rapamycin, 9-deoxo-16-0-desmethyl-27-O-desmethyl-39-0 15 desmethyl rapamycin, 9-deoxo-16-0-desmethyl-270-desmethyl-36-de(3-cis methoxy-4-trans-hydroxycyclohexyl)-36-(hydroxycyclohexenyl) rapamycin, 9-deoxo 16-O-desmethyl-27-0-desmethyl-36-de(3-cis-methoxy-4-trans-hydroxycyclohexyl) 36-(hydroxynorbornyl) rapamycin, 9-deoxo-16-0-desmethyl-27-0-desmethyl-36 de(3-cis-methoxy-4-trans-hydroxycyclohexyl)-36-(4-methyl hydroxycyclohexyl) 20 rapamycin. In a further aspect of this class, the present invention provides a system for the combinatorial production of recombinant host strains capable of producing raparnycin analogues, involving construction of a genomic deletion rapQONMLKJI introduced into S. hygroscopicus and its partial complementation by a combinatorial 25 library of gene cassettes comprising one or a plurality of the deleted auxiliary genes rapQ, rqpN/O, rapM, rapL, rapK, rapJ, and rapl. The approach outlined comprises as a part the cloning strategy to combine genes including but not exclusively limited to rapK, rapt, rapQ, rapM, rapN/O, rapL and rapJ, and / or genes with similar gene functions, in any possible gene 30 combination and gene order. Another aspect of the Invention allows the enhancement of gene expression by changing the order of genes in a gene cassette. As applied to the preferred class, the genes may comprise one or more of rapK, rap/, rapQ, rapM, rapNIO, rapL and rapJ and / or genes with similar functions, allowing the arrangement of the genes in a 35 multitude of permutations as outlined in Example 5. 24 The cloning strategy outlined in this invention also allows the introduction of a histidine tag in combination with a terminator sequence 3' of the gene cassette to enhance gene expression. Those skilled in the art will appreciate other terminator sequences could be used. 5 Another aspect of the invention describes the multiple uses of promotor sequences in the assembled gene cassette to optimise gene expression. It will now be obvious to one skilled in the art that S. hygroscopicus deletion strains, the deletion comprising, but not limited to, a gene or a sub-set of the genes rapQ, rapN/O, rapM, rapL, rapK, rapJ and rapt could be constructed. In this case, 10 gene cassettes for complementation or partial, complementation would generally comprise single genes or a plurality of genes selected from the sub-set of the genes deleted. It is well known to those skilled in the art that there are homologues to several of the rapamycin modifying and precursor supply genes in the gene clusters of 15 closely related systems Including FK506 (Motamedi et al, 1996; Motamedi et al, 1997; Motamedi & Shafiee, 1998) and FK520 (Wu et a, 2000). These include the following as described in Table I below: Table I Rapamycin gene FK506 homologue FK520 'hyg' homologue rapt (Acc No fkbM (Acc No fkbM (Acc No CAA60470) AAC44360) AAF86398) rapJ (Acc No fkbD (Acc No fkbD (Acc No CAA60469) AAC44359) AAF86397) rapK (Acc No fkbO (Acc No fkbO (Acc No Orf5 (Acc No CAA60468) AAC68817) AAF86394) ± AAC38060) rapL (Abc No fkbL (Motamedi & fkbL (Acc No CAA60467) Shafiee-, 1998) . AAF86391) 20 Although the gene clusters of other closely related systems, including but not limited to those for the biosynthesis of FK523, meridamycin, FK525, antascomicin and tsukubamycin have not yet been sequenced, it can be anticipated that these will be shown to bear a close resemblance to those whose sequences have been determined, and, in particular, that these gene clusters will contain close homologues 25 of several of the rapamycin modifying and precursor supply genes. Therefore, in a 25 further aspect of the invention, genes from heterologous gene clusters from such closely related systems, including but not limited to FK506, FK520, FK523, antascomicin, meridamycin, FK525, 'hyg' and tsukubamycin can be included in gene cassettes in place of or in addition to their rapamycin homologues for 5 complementation and/or partial complementation of a rapamycin producer strain containing a gene deletion or deletions including but not limited to the genes rapK, rapl, rapQ, rapM, rapN/O, rapL and rapJ. It is well known to those skilled in the art that polyketide gene clusters may be expressed in heterologous hosts (Pfeifer and Khosla, 2001). Accordingly, the present 10 invention includes the transfer of the rapamycin biosynthetic gene cluster with or without resistance and regulatory genes, either complete or containing deletions, for complementation in heterologous hosts. Methods and vectors for the transfer as defined above of such large pieces of DNA are well known in the art (Rawlings, 2001; Staunton and Weissman, 2001) or are provided herein in the methods disclosed. In 15 this context a preferred host cell strain is a prokaryote, more preferably an actinomycete or Escherichia coli, still more preferably include, but are not limited to S. hygroscopicus, S. hygroscopicus sp., S. hygroscopicus var. ascomyceticus, Streptomyces tsukubaensis, Streptomyces coelicolor, Streptomyces lividans, Saccharopolyspora erythraea, Streptomyces fradiae, Streptomyces avermitiis, 20 Streptomyces cinnamonensis, Streptomyces rimosus, Streptomyces albus, Streptomyces griseofuscus,. Streptomyces longisporoflavus, Streptomyces venezuelae, Micromonospora griseorubida, Amycolatopsis mediterranei or Actinoplanes sp. N902-109. In another aspect, the rapamycin analogues of the invention may be obtained by 25 a process comprising the steps of: a) ponstructing a deletion strain, by the methods of the intention; the deletion Including, but not limited to, the genes rapK, rapQ, rapN/O, rapM, rapL, rapJ and rapl,. or a sub-set thereof; b) culturing the strain under conditions suitable for polyketide production; 30 c) optionally, isolating the rapamycin analogue intermediate produced; d) constructing a biotransformation strain containing a gene cassette comprising all or a sub-set of the genes deleted; e) feeding the rapamycin analogue intermediate in culture supernatant or isolated as in step c) to a culture of the biotransformation strain under suitable 35 biotransformation conditions 26 f) optionally isolating the rapamycin analogue produced. Suitable host strains for the construction of the biotransformation strain include the native host strain in which the rapamycin biosynthetic gene cluster has 5 been deleted, or substantially deleted or inactivated, so as to abolish polyketide synthesis, or a heterologous host strain. Methods for the expressing of gene cassettes comprising one or a plurality of modifying or precursor supply genes in heterologous hosts are described in WO 01179520. In this context heterologous hosts suitable for biotransformation of the said FKBP-ligand analogue intermediates 10 include, but are not limited to, S. hygroscopicus, S. hygroscopicus sp., S. hygroscopicus var. ascomyceticus, Streptomyces tsukubaensis, Streptomyces coelicolor, Streptomyces lividans, Saccharopolyspora erythraea, Streptomyces fradiae, Streptomyces avermitilis, Streptomyces cinnamonensis, Streptomyces rimosus, Streptomyces albus, Streptomyces griseofuscus, Streptomyces 15 longisporollavus, Streptomyces venezuelae, Micromonospora griseorubida, Amycolatopsis mediterranel, Escherichia coli and Actinoplanes sp. N902-109. The close structural relationship between rapamycin and FK506, FK520, FK523, 'hyg', meridamycin, antascomicin, FK525 and tsukubamycin, among others, and the established homologies between genes involved in the biosynthesis of 20 rapamycin and FK506 and FK520 videe supra), renders obvious the application of the methods of the present invention to these closely related systems. In a further aspect, therefore, the invention includes the construction of deletion strains of the producer strains of closely related compounds, including but not limited to FK506, FK520, FK523, 'hyg', antascomicin, meridamycin, FK525 and tsukubamycin 25 containing a gene deletion or deletions of modifying and/or precursor supply genes, and more particularly including but not limited to genes with sifnilar functions as rapK, rapl, rapQ, rapM, rapN/O, rapL and rapJ, and their complementation or partial complementation with a gene or gene cassettes comprising all or a sub-set of the deleted homologous genes, or their functional homologues from heterologous gene 30 clusters, including but not limited to rapK, rapid, rapQ, rapM, rapN/O, rapL and rapJ to produce recombinant strains capable of producing polyketide analogues varying from the parent polyketide in the Incorporation of alternative precursors and/or the extent of post-PKS modification. Further, the invention provides a method of producing said polyketide analogues by culturing said recombinant host strains, and optionally 35 isolating the polyketide analogues produced. 27 In a further aspect, the invention provides a method for the production of recombinant host strains capable of producing polyketide FKBP-ligand analogues (other than rapamycin) varying from the parent polyketide in the incorporation of alternative precursors and/or the extent of post-PKS modification, comprising the 5 construction of a genomic deletion strain from which all or a portion of the auxiliary genes have been removed, and its partial complementation by a gene cassette comprising one or a plurality of the deleted genes and/or their homologues, and further a method of producing said polyketide analogues by culturing said recombinant host strain, and optionally isolating the polyketide analogues produced. 10 It is well known in the art that in most cases that auxiliary genes are co-located with polyketide synthase genes in a gene cluster (Hopwood, 1997; Motamedi and Shafiee, 1998; Wu et al., 2000) thus facilitating creation of the deletion strain. The auxiliary genes to be deleted may or may not naturally form a contiguous sequence, however, once the deletion strain has been created the partial complementation by 15 gene cassettes provides an expeditious approach to the production of recombinant strains in which one or a plurality of the said genes have been deleted. Therefore, in a further aspect, the invention provides a method for the combinatorial production of recombinant host strains capable of producing polyketide FKBP-ligand analogues (other than rapamycin) varying from the parent polyketide in the incorporation of 20 alternative precursors and/or the extent of post-PKS modification, comprising the partial complementation of the said genomic deletion strain by a combinatorial library of gene cassettes comprising one or a glurality of the deleted genes, and further a method of producing said polyketide analogues by culturing said recombinant host strains under conditions suitable for polyketide production, and optionally isolating 25 the polyketide analogues produced. In this context a preferred recombinant host cell strain is a prokaryote, more preferably an actinomycete, still more preferably a strain selected from S. hygroscopicus, S. hygroscopicus sp., S. hygroscopicus var. ascomyceticus, Streptomyces tsukubaensis, Streptomyces coelicolor, Streptomyces lividans, Saccharopolyspora erythraea, Streptomyces fradiae, Streptomyces 30 avermitiis, Streptomyces cinnamonensis, Streptomyces rimosus, Streptomyces albus, Streptomyces griseofuscus, Streptomyces longisporoflavus, Streptomyces venezuelae, Micromonospora griseorubida, Amycolatopsis mediterranei or Actinoplanes sp. N902-109. Those skilled in the art will appreciate that the methods of the present 35 invention could be applied to recombinant host strains in which the polyketide 28 synthase (PKS) has been altered by genetic engineering to express a modified rapamycin or other polyketide analogue. The prior art describes several methods for the production of novel polyketides by the deletion or inactivation of individual domains (W093/13663, W097/92358), construction of hybrid polyketide synthases 5 (WO98/01546, WOOO/0061 8, WOQO/01 827) or alteration of domain specificity by site-directed mutagenesis (WO02/14482). It is well known in the art that non-ribosomal peptides are biosynthesised by Non-Ribosomal Peptide Synthases (NRPSs) via the stepwise condensation of successive amino acid building blocks, in a process analogous to that of polyketide 10 biosynthesis (for review see Marahiel et al., 1997; Schwarzer and Marahiel, 2001). It is well known that several non-ribosomal peptides include unusual amino-acid residues (modified, proteinogenic amino acids and / or non-proteinogenic amino acids) and carboxy acids, the biosynthetic genes for which are co-located with the non-ribosomal peptide synthase genes in the non-ribosomal peptide gene cluster 15 (Marahiel et al., 1997; Konz and Marahiel, 1999; Blanc et al., 1997). In several cases, the non-ribosomal peptide product initially released from the NRPS is further modified by a set of enzymes, Including but not limited to glycosyl transferases, reductases, acylation or heterocyclic ring formation (Konz and Marahiel, 1999; Blanc et al., 1995). These include the antibiotics chloroeremomycin, pristinamycin, 20 vancomycin and bleomycin (Konz and Marahiel, 1999; Du et al., 2000). The genes for these post-NRPS enzymes are also typically co-located in the biosynthetic gene cluster (Marahiet et al., 1997; Schwarzer and Marahiel, 2001). Therefore, in a further aspect, the invention includes a method for the production of non-ribosomal peptide analogues, varying from the parent non-ribosomal peptide in the incorporation of 25 alternative precursor amino-acids and/or the extent of post-NRPS modification, comprising the construction of a genomic deletion strain from Which all or a portion of the ger1es encoding the native amino-acid precursor synthesis and/or post-NRPS enzymes have been removed, and its partial complementation by a gene cassette comprising one or a plurality of the deleted genes and/or their homologues, and 30 further a method of producing said non-ribosomal peptide analogues by culturing said recombinant host strain, and optionally isolating the non-ribosomal peptide analogues produced. The post-NRPS and precursor biosynthesis genes to be deleted may or may not naturally form a contiguous sequence, however, once the deletion strain has been created the partial complementation by gene cassettes 35 provides an expeditious approach to the production of recombinant strains in which 29 one or a plurality of the said genes have been deleted. Therefore, in a further aspect, the invention provides a method for the combinatorial production of recombinant host strains capable of producing non-ribosomal peptide analogues varying from the parent non-ribosomal peptide in the incorporation of alternative 5 precursors and/or the extent of post-NRPS modification, comprising the partial complementation of the said genomic deletion strain by a combinatorial library of gene cassettes comprising one or a plurality of the deleted genes, and further a method of producing said non-ribosomal peptide analogues by culturing said recombinant host strains under conditions suitable for non-ribosomal peptide 10 production, and optionally isolating the non-ribosomal peptide analogues produced. In this context a preferred recombinant host cell strain is a prokaryote, more preferably an actinomycete, still more preferably a strain selected from S. hygroscopicus, S. hygroscopicus sp., S. hygroscopicus var. ascomyceticus, Streptomyces tsukubaensis, Streptomyces coellcolor, Streptomyces lividans, 15 Saccharopolyspora erythraea, Streptomyces fradiae, Streptomyces avermitiis, Streptomyces cinnamonensis, Streptomyces rimosus, Streptomyces albus, Streptomyces griseofuscus, Streptomyces longisporofiavus, Streptomyces venezuelae, Micromonospora griseorubida, Amycolatopsis mediterranei or Actinoplanes sp. N902-109. 20 It is well known that many actinomycetes contain multiple biosynthetic gene clusters for different secondary metabolites, including polyketides and non ribosomally synthesised peptides. Specifically, it has been demonstrated that strains of S. hygroscopicus produce a variety of polyketides and non-ribosomally synthesised peptides in addition to rapamycin, FK506, FK520, FK523, meridamycin, 25 FK525, antascomicin and tsukubamycin. These include, but are not limited to, elaiophy!in, bialaphos, hygromycin, augustmycin, endomycin (A, B), glebomycin, hygroscopin, ossamycin and nigericin. These additional biosynthetic gene clusters represent a competing requirement for.biosynthetic precursors and an additional metabolic demand on the host strain. In order to enhance production of the desired 30 rapamycin, or other polyketide, analogues, it may therefore be advantageous to delete or inactivate any other biosynthetic gene clusters present in the host strain. Methods for the deletion or inactivation of biosynthetic gene clusters are well known in the art. In a further aspect of this class, the invention provides a mutasynthesis 35 methodology for the complementation of recombinant deletion strains 30 In a further aspect, S. hygroscopicus strains of the present invention containing a deletion of rapL may be fed with analogues of the naturally incorporated amino acid, L-pipecolic acid, to produce new analogues of rapamycin in which the pipecolyl residue.is replaced. Prior art describes that a rapL mutant can be 5 complemented by the addition of L-pipecolic acid to the culture (Khaw et al., 1998). Similarly, it was demonstrated that rapamycin analogues were isolated after the feeding and incorporation of L-pipecolic acid analogues, L-proline, L-trans-4 hydroxyproline, L-cis-4-hydroxyproline, L-cis-3-hydroxyproline, trans-3-aza-bicyclo[3, 1, ]hexane-2-carboxylic acid (W098/54308). Using S. hygroscopicus MG2-1 0 as 10 strain background to express genes or gene cassettes encoding for post-PKS modifying steps not including rapL or rapL homologues, a library of S. hygroscopicus strains is generated, capable of producing a plurality of modified products on feeding with L-pipecolic acid analogues. Suitable L-pipecolic acid analogues include alkyl-, halo-, hydroxy-, and amino-substituted pipecolic acids and prolines, and more 15 particularly L-proline, L-trans-4-hydroxyproline, L-cis-4-hydroxyproline, L-cis-3 hydroxyproline, trans-3-aza-bicyclo[3, 1, 0]hexane-2-carboxylic acid and L-pipecolic acid analogues demonstrated to catalyse PP-ATP exchange measured by a modification of Lipmann's method (Nielsen et al., 1991) including L-4-hydroxyproline, 1- hydroxyproline, 2-hydroxyproline, 3- hydroxyproline, trans-3-methyl-L-proline, cis 20 3-methylproline, cis-3-methyl-DL-proline, cis, trans-4-methylproline,' cis-4-methyl-DL proline, trans-4-methyl-DL-proline, trans-4-aminoproline, cis-4-chloro-L-proline, 5 iminoproline hydrochloride, cis-5-methyl-DL-proline, (+)-piperazic acid, 5 chloropipecolic acid, 5-hydroxypipecolic acid, cis-4-hydroxy-L-pipecolic acid, trans-4 hydroxy-D-pipecolic acid, 4-hydroxyallopipecolic acid, thiazolidine-4-carboxylic acid 25 (Nielsen et al.,1991). This approach is exemplified in Example 7. The production of a limited number of novel rapamycinzanalogues after feeding-close structural analogues of the natural 4,5-dihydroxycyclohex-1 enecarboxylic acid.starter.unit to cultures of S. hygroscopicus has previously been described, thus demonstrating that the loading module of the rapamycin polyketide 30 synthase has some flexibility with respect to the starter acid (P.A.S. Lowden, PhD dissertation, University of Cambridge, 1997). However, these methods led to the production of a mixture of products. In a further aspect, the present invention allows for the production of rapamycin and related FKBP-ligand analogues by feeding strains of the present invention with analogues of the naturally incorporated 4,5 35 dihydroxycyclohex-1-enecarboxylic acid starter unit to produce rapamycin analogues 31 incorporating alternative starter units including, but not limited to, cyclohexane carboxylic acid, 3-cis,4-transadihydroxycyclohexane carboxylic acid, 1-cyclohexene carboxylic acid, 3-cyclohexene carboxylic acid, cycloheptane carboxylic acid, 2 norbornane carboxylic acid, 3-hydroxycyclohexane carboxylic acid, 4 5 hydroxycyclohexane carboxylic acid, 3-methylcyclohexane carboxylic acid, 4 methylcyclohexane carboxylic acid, 3-(cis/trans)methoxycyclohexane carboxylic acid, 4-(cis/trans)methoxycyclohexane carboxylic acid, 4-oxo cyclohexane carboxylic acid, 3-fluoro-4-hydroxycarboxylic acid and 4-fluoro-3-hydroxycarboxylic acid, 3 cyclohexane oxide carboxylic acid, 3,4-cis-dihydroxycyclohexane carboxylic acid, 3 10 chloro-4-hydroxycarboxylic acid and 4-chloro-3-hydroxycarboxylic acid (and the pair of opposite diastereomers), cyclohexylpropionic acid, 4-tert-Butylcyclohexane carboxylic acid and simple esters and salts thereof. This approach is exemplified in Examples 8,19 and 20. Additionally, structural analogues of biosynthetic precursors of the 4,5 15 dihydroxycyclohex-1-enecarboxylic acid starter unit may be fed (Lowden et al., 2001), leading to production of novel rapamycin analogues incorporating alternative starter units. However, these methods can lead to the production of mixed groups of products; therefore, the present invention additionally provides a method for 20 removing the competition between the endogenously produced starter unit and the alternative starter acid analogues that are fed in order to improve the efficiency of production of novel rapamycin analogues. In order to remove the competition between the endogenously produced natural starter unit and the alternative starter acid analogues fed, it is preferable to 25 disrupt the biosynthesis of the natural 4,5-dihydroxycyclohex-1 -enecarboxylic acid starter unit. This may be achieved by deletion or inactivation of one or more of the genes involved in the biosynthesis of the natural 4,5-dihydroxycyclohex-1 enecarboxylic acid starter unit from shikimic acid (Lowden et a., 2001) or the biosynthesis of shikimic acid Itself. In the latter case, it may be necessary to 30 supplement cultures with aromatic amino acids (phenyl alanine, tyrosine, tryptophan). Alternatively, endogenous production of the natural 4,5-dihydroxycyclohex-1 -ene carboxylic acid starter unit may be suppressed by the addition of a chemical inhibitor of shikimic acid biosynthesis. Such inhibitors are well known in the literature. In a further aspect, the invention makes use of the surprising discovery that 35 rapK is involved in the supply of the biosynthetic precursor(s), e.g. 4,5 32 dihydroxycyclohex-1-ene carboxylic acid starter unit of rapamycin and therefore that deletion or inactivation of rapK or a rapK homologue provides a strain lacking In competition between the natural starter unit and fed non-natural starter units. In another aspect, the invention provides. a method for the efficient incorporation of fed 5 acids including, but not limited to those described below. Therefore in one aspect of the invention the method comprises feeding starter R1 CO2H units of the formula RsR 6 where X = bond or CH 2 and R 1 , R 2 , R 3 , R4, R 5 and Re may be the same or different and may independently be Cl, F, OH, SH, H, alkyl, CN, Br, R 7 , OR 7 , C(O)R 7 or HNR 7 where R 7 is a C1-C4 alkyl; R 1 and R 3 , R 2 and 10 R 4 , R 3 and Rs, R 4 and R6, R 1 and Ra, or R 2 and Re may be joined as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link,

R

1 and R 2 , R 3 and R 4 or R 5 and Re may be taken together as a ketone; provided that no more than 4 of R 1 , R 2 , R 3 , R 4 , Rs or Re may be Cl; no more than 2 of R 1 , R 2 , R 3 ,

R

4 , R6 or R may be HNR 7 ; no more than 2 of R 1 , R 2 , R 3 , R 4 , R 5 or Re may be SH and 15 both R groups from one carbon on the ring are not OH. In a preferred embodiment the starter unit is not selected from the group consisting of: cyclohexane carboxylic acid, 3-cis,4-trans-dihydroxycyclohexane carboxylic acid, cycloheptane carboxylic acid and 3-(cis/trans)-methylcyclohexane carboxylic acid 20 In preferred embodiments: where R 1 , R 2 , R 3 , R 4 , Re or Re are a combination of F and OH substitution no more than 3 of R 1 .- are substituted and the remainder are H. Where R 1 , R 2 , R 3 , R 4 , R 5 or Re are a combination of Cl and OH substitution no more than 3 of R1-6 are substituted and the remainder are H. Where any two of R 1 ,

R

2 , R 3 , R 4 , R5 or Re are OH and any two remaining R groups are F on one carbon the 25 remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are Cl the remainder are H. Where two of R1, R 2 , R 3 , R 4 , R 5 or Re are Cl, not originating from the same carbon, and a further R is OH the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is alkyl and the remainder are H; the alkyl group shall have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 , R 4 , Re or Re is NHRr the remainder are H. 30 In more highly preferred embodiments: where two of R 1 , R 2 , R 3 , R 4 , R5 or Re are OH and a third R group is F, the remainder are H. Where two of R 1 , R 2 , R 3 , R4,

R

5 or Re are F the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , Re or Re are OH the remainder are H. Where two of R 1 , R 2 , R 3 , R4, Rs or Re are OH and a third R group is 33 Ci the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are F, and a third R group is OH the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is SH the remainder are H. Where one of R 1 , R 2 , R 3 , R4, R 5 or Re is SH and a second R group is OH (not originating from the same carbon) the remainder are H. 5 In still more higly preferred embodiments: where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is F the remainder are H. Where of R 1 , R 2 , R 3 , R 4 , R5 or R are CI the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , Rs or Re, are F and a second R group is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 ,

R

5 or Re is Cl and a second R group is OH (not originating from the same carbon) the 10 remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or R is alkyl and the remainder are H; the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 , R4, R 5 or Re is alkyl and a second R group is OH (not originating from the same carbon) and remainder are H; the alkyl group shall contain no more than 4 carbons and have a linear length of no 15 greater than 3 carbons. A further aspect of the invention comprises feeding starter units of the formula R1

CO

2 H

R

2 y' R

R

5

R

6 ,where X = bond or CH 2 and R 1 , R 2 , R 3 , R 4 , R 5 and Re may be the same or different and may independently be Cl, F, OH, SH, H, alkyl, CN, Br, R 7 , OR,

C(O)R

7 or HNR 7 where R 7 is a C1-C4 alkyl; R 1 and R 3 , R 2 and R 4 , R 3 and R 5 , R 4 and 20 Re, R 1 and R 5 , or R 2 and Re may be joined as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link, R 1 and R 2 , R 3 and R 4 or R. and Re may be taken together as a ketone; provided that no more than 4 of R 1 , R 2 ,

R

3 , R 4 , R 5 or R may be Cl; no more than 2 of R1, R 2 , R 3 , R4, R 5 or Re may be HNR 7 ; no more-than 2 of R 1 , R 2 , R 3 , R 4 , Ri or Re may be SH and both R groups from one 25 carbon on the ring are not OH. In a preferred embodiment the starter unit is not selected from the group consisting of: 1-cyclohexene carboxylic acid and 1-cycloheptene carboxylic acid In preferred embodiments, where R 1 , R 2 , R 3 , R 4 , R 5 or Re are a combination of F and OH substitution no more than 3 of R 1

.

6 are substituted and the remainder are 30 H. Where R 1 , R 2 , R 3 , R 4 , R 5 or Re are a combination of Cl and OH substitution no more than 3 of R 1 .e are substituted and the remainder are H. Where any two of R 1 ,

R

2 , R 3 , R 4 , Rs or Re are OH and two of the remaining R groups are F on the same carbon the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are Cl the 34 remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are Cl, not originating from the same carbon, and a further R group is OH the remainder are H. Where one of

R

1 , R 2 , R 3 , R 4 , Rs or R is alkyl and the remainder are H; the alkyl group shall have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or R 6 is 5 NHR 7 the remainder are H. In more highly preferred embodiments: where two of R 1 , R 2 , R 3 , R 4 , R 5 or R. are OH and a third R group is F, the remainder are H. Where two of R 1 , R 2 , R 3 , R4,

R

5 or Re are F the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are OH the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are OH and a third R group is 10 Cl the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are F, and a third R group is OH the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , Rs or Re is SH the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is SH and a second R group is OH (not originating from the same carbon) the remainder are H. In still more higly preferred embodiments: where one of R 1 , R 2 , R 3 , R 4 , R 5 or 15 Re is F the remainder are H. Where of R 1 , R 2 , R 3 , R 4 , R 5 or Re are Cl the remainder are H. Where one of R 1 , R 2 , R 3 , R4, R6 or Re, are F and a second R group is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 ,

R

5 or Re is Cl, a second R group is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is alkyl and the remainder 20 are H; the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is alkyl and a second R group is OH (not originating from the same carbon) the remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. 25 A further aspect of the invention comprises feeding starter units of the formula? R1

CO

2 H R2 R3:<! R4 where X = bond or CH 2 , R 1 and R 2 , may be the same or different and may independently be F, Cl, OH, SH, H, CN, OR 7 , C(O)R 7 , or NHR 7 wherein R 7 30 is a C1-C4 alkyl, R 1 and R 2 may also be taken together to form a ketone, a spirocyclopropyl group or with -OCH 2 -, -CH 2 0-, -SCH 2 - or -CH 2 S-; furthermore R 3 , and R 4 may be the same or different and may independently be be F, Cl, Br, OR 7 , H or CN; provided that both R groups from one carbon on the ring are not OH. 35 In a preferred embodiment the starter unit shall not be 5-cis-hydroxyl-3 cyclohexene carboxylic acid. In preferred embodiments:- Where two of R 1 , R 2 , R 3 , or R 4 are F the remainder are H. Where-one of R 1 , R 2 , Ra, or R 4 is Cl the remainder are H. Where one of R 3 , or .5 R 4 is F and one of R1 or R2 is OH the remainder are H. Where one of R 3 or R 4 is Cl and one of R 1 or R 2 is OH the remainder are H. Where one of R 1 or R 2 is SH the remainder are H. Where one of R 1 , R 2 , R 3 , or R 4 is alkyl and the remainder are H; the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 3 or R4 is alkyl and R 1 or R 2 is OH the 10 remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. In more highly preferred embodiment where one of R 1 , R 2 , R 3 , or R 4 is F the remainder are H. Where one of R 1 , R 2 , R 3 , or R 4 is Cl the remainder are H A further aspect of the invention comprises feeding starter units of the formula

R

2

R

1 R3

CO

2 H 15 R6 where R 1 , R 2 , R 3 , R 4 , Rs or Re may be the same or different and may independently be be be Cl, F, OH, SH, H, alkyl, CN, Br, R 7 , OR 1 , C(O)R 7 or

HNR

7 where R 7 is a CI-C4 alkyl; R 1 and R 3 , R 2 and R 4 , R 3 and R 5 , R 4 and Re, R 1 and

R

5 , or R 2 and Re may be joined as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link, R 3 and R 4 or R, 5 and Re may be taken 20 together as a ketone;provided that both R groups from one carbon on the ring are not OH. In preferred embodiments: Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are F the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , Re or Re are OH, the remainder are H. Where two of R 1 , R 2 , R 3 , R4, R 5 or Re are OH, and a third R group is F the remainder 25 are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are OH, and a third R group is Cl the remainder are H. Where two of R 1 , R 2 , R 3 , R4, R 5 or Re are F and a third R group is OH the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is Br the remainder are H. Where one of R 1 , R 2 , R 3 , R4, R 5 or Re is Br and a second R group is OH the remainder are H 30 In more preferred embodiments: Where one of R 1 , R 2 , R 3 , R 4 , Re or Re is F the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re are Cl the remainder are H. Where one of R,, R 2 , R 3 , R 4 , R 5 or Re is F and a second R group is OH (not 36 originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 , R4, Rs or R is Cl and a second R group is OH (not originating from the same carbon) the remainder-are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is SH the remainder are H. Where one R 1 , R 2 , R 3 , R4, R 6 or Re is SH and a second R group is OH (not originating 5 from the same carbon) the remainder are H. Where one of R1, R 2 , R 3 , R4, R 5 or Re is alkyl and the remainder are H; the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 , R 4 ,

R.

5 or Re alkyl and a second R group is OH (not originating from the same carbon) the remainder are H; and the alkyl group shall contain no more than 4 carbons and have 10 a linear length of no greater than 3 carbons A further aspect of the invention comprises feeding starter units of the formula

R

2

R

1 R3

CO

2 H

R

5 R4

R

6 where R 1 , R 2 , R 3 , R 4 , Re or Re may be the same or different and may independently be be be Cl, F, OH, SH, H, alkyl, CN; Br, R 7 , OR 7 , C(O)R 7 or 15 HNR 7 where R 7 is a C1-C4 alkyl; R 1 and R 3 , R 2 and R 4 , R 3 and Rs, R 4 and Re, R 1 and Rs, or R 2 and R 8 may be joined as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link, R 3 and R 4 or R 6 and Re may be taken together as a ketone;provided that both R groups from one carbon on the ring are not OH. 20 In preferred embodiments: where R 1 , R 2 , R 3 , R4, R 5 or Re are a combination of F and OH substitution no more than 3 of R 1

.

8 are substituted and the remainder are H. Where R 1 , R 2 , R 3 , R 4 , Rs or Re are a combination of Cl and OH substitution no more than 3 of R 1 . are substituted and the remainder are H. Here two of R 1 , R 2 ,

R

3 , R 4 , Rs or Re are OH and two of the remaining R groups are F on one carbon the 25 remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are Cl the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are Cl (not originating from the same carbon) and a third R group is OH, the remainder are H. Where one of R1, R 2 , R 3 , R4, R 5 or Re is alkyl and the remainder are H; the alkyl group shall have a linear length of no greater than 3 carbons. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or R 6 are SH the remainder 30 are H. Where one of R 1 , R 2 , R 3 , R 4 , Re or Re is HNR 7 the remainder are H. In more preferred embodiments: Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are F the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or R are OH the remainder are 37 H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are OH and a third R group is F, the remainder are H. Where two of R 1 , R 2 , R 3 , R4, R 5 or R are OH and a third R group Is Cl the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 , R 5 or Re are F, and a third R groups is OH the remainder are H.- Where one of R 1 , R 2 , R 3 , R 4 , Rs or Re is Br the 5 remainder are H. Where one R 1 , R 2 , R 3 , R 4 , R 5 or Re is Br and a second R group is OH (not originating from the same carbon) the remainder are H. Where one of R 1 ,

R

2 , R 3 , R 4 , Rs or Re is SH the remainder are H. Where one of R 1 , R 2 , R 3 , R4, R 5 or Re is SH and a second R groups is OH (not originating from the same carbon) the remainder are H. 10 In more preferred embodiments: Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is F the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , Re or Re is Cl the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is F and a second R group is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 ,

R

5 or Re is Cl and a second R group is OH (not originating from the same carbon) the 15 remainder are H. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is alkyl and the remainder are H; the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 , R 4 , R 5 or Re is alkyl and a second R group is OH (not originating from the same-arbon) the remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of 20 no greater than 3 carbons. A further aspect of the invention comprises feeding starter units of the formula

R

2

R

1 R3 CO2H . where R 1 and R 2 , may be the same or different and may independently be F, Cl, OH, SH, H, CN, OR 7 , C(O)R 7 , or NHR 7 wherein R 7 is a Cl 25 C4 alkyl, R 1 and R 2 may also be taken together to form a ketone, a spirocyclopropyl group or with -OCHr,

-CH

2 0-, -SCH2- or -CH 2 S-; furthermore

R

3 , and R 4 may be the same or different and may independently be be F, Cl, Br, OR 7 , H or CN; provided that both R groups from one carbon on the ring are not OH.. In preferred embodiments: Where one of R 1 , R 2 , R 3 and R 4 is F the remainder 30 are H. Where one of R 1 , R 2 , R3 and R 4 is Cl the remainder are H. Where one of R 1 ,

R

2 , R 3 and R4 is F and a second R groups is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 and R 4 is Cl and a second R group is OH (not originating from the same carbon) the remainder are H. Where one 38 of R 1 , R 2 , R 3 and R 4 is SH the remainder are H. Where one of R 1 , R 2 , R 3 and R 4 is alkyl the remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 and

R

4 is alkyl and a second R groups is OH (not originating from the same carbon) the 5 remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where two of R 1 , R 2 , R 3 and R 4 are F the remainder are H. An additional aspect of the invention comprises feeding starter units of the formula R1 CO2H 10 R5 where X = bond or CH 2 ;and R 1 , R 2 , R 3 , R 4 or R 5 may be the same or different and may independently be be Cl, F, OH, SH, H, alkyl, CN, Br, R 7 , ORT,

C(O)R

7 or HNR 7 where R 7 is a C1-C4 alkyl, R 1 and R 3 , R 2 and R 4 , may be taken together as a ketone or linked as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link where R, and R 2 or R 3 and R 4 are linked as 15 a spiro-cyclopropyl group or with -OCH 2 - or -CH 2 0- or -SCH 2 - or -CH 2 S-, R5 may be F, CL, OR 7 , H or CN; provided that no more than two of R 1 , R 2 , R 3 , R 4 or RS are SH and that both R groups attached to one carbon are not OH. In preferred embodiments: where R 1 , R 2 , R 3 , R 4 or R 5 are a combination of F and OH no more than 3 of R 1 , R 2 , R 3 , R 4 or R 5 are substituted and the remainder are 20 H. Where R 1 , R 2 , R 3 , R 4 or R 5 are a combination of Cl and OH no more than 3 of R 1 .s are substituted and the remainder are H. Where R 1 , R 2 , R 3 , R 4 or Rs are a combination of two are OH (not on the same carbon) and two are F on one carbon the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 or Rs are Cl the remainder are H. Where two of R 1 , R 2 , R 3 , R4 or R 5 are Cl (not originating from the same carbon) and a 25 third R group is OH the remainder are H. Where one of R1, R 2 , R 3 , R 4 or RS is alkyl the remainder are H; and the alkyl group shall have a linear length of no greater than 3 carbons. Where two of R 1 , R 2 , R 3 , R4 or Rs are SH the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 or R 5 is NHR 7 the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 or R 5 is SH the remainder are H. 30 in more highly preferred embodiments: where one of R 1 , R 2 , R 3 , R 4 or R 6 is OH the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 or R 5 is F the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 or R5 is Cl the remainder are H. Where one of R 1 , R 2 ,

R

3 , R 4 or R 5 is F and a second R group is OH (not originating from the same carbon) 39 the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 or Rs is Cl and a second R groups is OH (not originating from the same carbon) the remainder are H. Where one of R 1 ,

R

2 , R 3 , R 4 or R 5 is SH and a second R group is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 , R 4 or Rs is alkyl the 5 remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 , R 4 or Rs is alkyl and a second R group is OH (not originating from the same carbon) the remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where two of R 1 , R 2 , R 3 , R 4 or R 5 are F 10 the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 or Rs are OH the remainder are H. Where two of R 1 , R 2 , R 3 , R 4 or R 5 are OH and a third R group is F the remainder are H. Where two of R 1 , R 2 , R 3 , R4 or Rs are OH and a third R groups is Cl the remainder are H. Where two of R 1 , R 2 , R 3 , R4 or R 5 are F and a third R group is OH the remainder are H. 15 An additional aspect of the invention comprises feeding starter units of the R1 CO2H

R

3 f formula R4 where R 1 , R 2 , R 3 and R 4 may be the same or different and may independently be Ol, F, OH, SH, H, alkyl, CN, Br, R 7 , OR , C(O)R 7 or HNR 7 where R 7 is a C1 -C4 alkyl, R 1 and R 2 or R 3 and R 4 may be taken together to form a 20 ketone, provided that two R groups attached to the same carbon are not both OH. In preferred embodiments: Where one of R 1 , R 2 , R 3 or R 4 is F the remainder are H. Where one of R 1 , R 2 , R 3 or R4 is Cl the remainder are H. Where one of R 1 ,

R

2 , R 3 or R 4 Is Br the remainder are H. Where one of R 1 , R 2 , R 3 or R 4 is OH the remainder are H. Where one of R 1 , R 2 , R 3 or R 4 is F and a second R group is OH 25 (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 or R4 is Cl and a second R groups is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 or R 4 is SH the remainder are H. Where one of R 1 , R 2 , R 3 or R 4 is SH and a second R groups is OH (not originating from the same carbon) the remainder are H. Where one of R 1 , R 2 , R 3 or R 4 is alkyl the 30 remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where one of R 1 , R 2 , R 3 or R 4 Is alkyl and a second R groups is OH (not originating from the same carbon) the remainder are H; and the alkyl group shall contain no more than 4 carbons and have a linear length of no greater than 3 carbons. Where two of R 1 , R 2 , R 3 or R 4 are F the 40 remainder are H. Where two of R 1 , R 2 , R 3 or R 4 are OH the remainder are H. Where two of R 1 , R 2 , R 3 or R 4 are OH and a third R group is F the remainder are H. Where two of R 1 , R 2 , R 3 or R 4 are OH and a third R group is CI the remainder are H. Where two of R 1 , R 2 , R 3 or R 4 are F and a third R group is OH the remainder are H. 5 in a preferred embodiment the present invention provides a method for the efficient incorporation of- 2-norbomane carboxylic acid; 2-(cis/trans) hydroxycyclohexane carboxylic acid; 3-(cis/trans)-hydroxycyclohexane carboxylic acid; 4-(cis4rans)-hydroxycyclohexane carboxylic acid; 2-(cis/Irans) 10 methylcyclohexane carboxylic acid; 4-(cis4rans)-methylcyclohexane carboxylic acid; 3-(cisfrans)-methoxycyclohexane carboxylic acid; 4-(cis4rans)-methoxycyclohexane carboxylic acid; 4-oxocyclohexane carboxylic acid; ethyl 2-oxocyclohexane carboxylic acid; 4-trans-n-pentylcyclohexane carboxylic acid; 2-trans-aminocyclohexane carboxylic acid; 4-cis-aminocyclohexane carboxylic acid; 4-(cis/trans) 15 aminomethylcyclohexane carboxylic acid; cyclopentane carboxylic acid; cyclobutane carboxylic acid; 1-methylcyclohexane carboxylic acid; 3-trans-hydroxy-4-cis fluorocyclohexane carboxylic acid and 4-trans-hydroxy-3-cis-fluorocyclohexane carboxylic acid; 3-cis-hydroxy-4-trans-fluorocyclohexane carboxylic acid and 4-cis hydroxy-3-trans-fluorocyclohexane carboxylic acid; 3-cis-hydroxy-4-trans 20 chlorocyclohexane carboxylic acid and 4-cis-hydroxy-3-trans-chlorocyclohexane carboxylic acid; 3-trans-hydroxy-4-cis-chlorocyclohexane carboxylic acid and 4-trans hydroxy-3-cis-chlorocyclohexane carboxylic acid; 3-trans-cyclohexeneoxide carboxylic acid; 3-cis-cyclohexeneoxide carboxylic acid; 3,4-cis dihydroxycyclohexane carboxylic acid and 3,4-trans-dihydroxycyclohexane carboxylic 25 acid; cyclohexaneacetic acid; cyclohexanepropionic acid or 4-cis/trans-tert butylcyc!ohexane carboxylic acid or simple esters or salts thereof into FKBP-ligand analogGes by a strain with rapK or a rapK homologue deleted or inactivated. In a more preferred embodiment the present invention provides a method for the efficient incorporation of: 3-(cis/trans)-hydroxycyclohexane carboxylic acid; 4-(cis/trans) 30 hydroxycyclohexane carboxylic acid; 3-(cis4rans)-methoxycyclohexane carboxylic acid; 4-(cis4rans)-methoxycyclohexane carboxylic acid; 4-oxo cyclohexane carboxylic acid; cyclobutane carboxylic acid; 3-trans-hydroxy-4-cis-fluorocyclohexane carboxylic acid and 4-trans-hydroxy-3-cis-fluorocyclohexane carboxylic acid; 3-cis hydroxy-4-trans-fluorocyclohexane carboxylic acid and 4-cis-hydroxy-3-trans 35 fluorocyclohexane carboxylic acid; 3-cis-hydroxy-4-trans-chlorocyclohexane 41 carboxylic acid and 4-cis-hydroxy-3-trans-chlorocyclohexane carboxylic acid; 3-trans hydroxy-4-cis-chlorocyclohexane carboxylic acid and 4-trans-hydroxy-3-cis chlorocyclohexane carboxylic acid; 3-trans-cyclohexeneoxide carboxylic acid; 3-cis cyclohexeneoxide carboxylic acid; 3,4-cis-dihydroxycyclohexane carboxylic acid and 5 3,4-trans-dihydroxycyclohexane carboxylic acid; cyclohexanepropionic acid; 4 c/s4rans-tert-butylcyclohexane carboxylic acid or simple esters or salts thereof into FKBP-ligand analogues by a strain with rapK or a rapK homologue deleted or inactivated. In a specific embodiment of the present invention the fed starter units are not: 10 cyclohexane carboxylic acid, 3-cis,4-trans-dihydroxycyclohexane carboxylic acid, 1 cyclohexene carboxylic acid, 3-cyclohexene carboxylic acid, cycloheptane carboxylic acid, 3-(cis'rans)-methylcyclohexane carboxylic acid, 4-(cisdrans) methylcyclohexane carboxylic acid, 1 -cycloheptene carboxylic acid or 5-cis-hydroxyl 3-cyclohexene carboxylic acid. 15 The strains for use in the embodiments described above are selected from the group comprising: Streptomyces hygroscopicus subsp. hygroscopicus NRRL 5491, Actinoplanes sp. N902-109 FERM BP-3832, Streptomyces sp. AA6554, Streptomyces hygroscopicus var. ascomyceticus MA 6475 ATCC 14891, Streptomyces hygroscopicus var. ascomyceticus MA 6678 ATCC 55087, 20 Streptomyces hygroscopicus var. ascomyceticus MA 6674, Streptomyces hygroscopicus var. ascomyceticus ATCC 55276, Streptomyces hygroscopicus subsp. ascomyceticus ATCC 14891, Streptomyces tsukubaensis No.9993 FERM BP 927, Streptomyces hygroscopicus subsp. yakushimaensis, Streptomyces sp. DSM 4137, Streptomyces sp. DSM 7348, Micromonospora n.sp. A92-306401 DSM 8429, 25 Steptomyces sp. MA 6858 ATCC 55098, Steptomyces sp. MA 6848. In a preferred embodiment said strain is selected from the group consisting of: Streptomyces hygroscopicus subsp. hygroscopicus NRRL 5491, Actinoplanes sp. N902-109 FERM BP-3832, Streptomyces sp. AA6554, Streptomyces hygroscopicus var. ascomyceticus MA 6475 ATCC 14891, Streptomyces hygroscopicus var. 30 ascomyceticus MA 6678 ATCC 55087, Streptomyces hygroscopicus var. ascomyceticus MA 6674, Streptomyces hygroscopicus var. ascomyceticus ATCC 55276, Streptomyces hygroscopicus subsp. ascomyceticus ATCC 14891, Streptomyces tsukubaensis No.9993 FERM BP-927, Streptomyces hygroscopicus subsp. yakushimaensis, Streptomyces sp. DSM 4137, Streptomyces sp. DSM 7348, 35 Micromonospora n.sp. A92-306401 DSM 8429 or Streptomyces sp. MA 6858 ATCC 42 55098. In a more highly preferred embodiment the strain is the rapamycin producer S. hygroscopicus-subsp. hygroscopicus. In the methods for the efficient incorporation of fed carboxylic acids described above the. compounds produced are analogues of the FKBP-ligards as described 5 herein, for example but without limitation: rapamycin, FK506, FK520, FK523, FK525, antascomicin, meridamycin and tsukubamycin. In a preferred embodiment the compounds produced are analogues of rapamycin, FK506 or FK520. In a more highly preferred embodiment the compounds produced are analogues of rapamycin; these compounds correspond to Formula I or Formula III as described below. 10 Additionally, the methods described above may be used to generate novel FK506 and FK520 analogues which correspond to Formula I below: Formula 1: R, me B37 Me O 0 OH O Me IMe R N Z

R

4 3 e R 5 R1 =

R

8

R

9 R0 R8 R 9 Ra = OH

R

9

R

8 Rg = H, OH, halo, thiol, alkyl 15 R 2 = H, alkyl, halo, hydroxyl, thiol R= H, alkyl, halo, hydroxyl, thiol R4= H, alkyl, halo, hydroxyl, thiol

R

5 =OMe, MeorH R6 = OMe, Me or H 43 R7 = CH 2

CH

3 or CH 2

CH=CH

2 Z = keto or CH 2 X=X'=bond; X=bond and X's CH 2 , S, 0 or X= OH 2 , S, 0, fused cyclopropyl unit and X'=bond R/

R

9 5 In a preferred embodiment, R 1 = R , or where Re = OH and Rq= H, OH, halo, alkyl or thiol. Rg R9 Rg

R

8 e R- R In a further preferred embodiment R1= , , or Re

R

9 where R 8 = OH and R 9 = halo.

R

9 10 FK520 =R , where Re = 4-trans-OH, R 9 = 3-cis-OCH 3 , and R 2 = R 3 = R4 = H, X = CH 2 , X' = bond, Z = keto, R 5 = Re = OCH 3 and R 7 = CH 2

CH

3 R9 FK506 = , where Re = 4-trans-OH, R 9 = 3-cis-OCH 3 , and R 2 = R 3 = R 4 = H, X = CH 2 , X'= bond, Z = keto, R 5 = Re = OCH 3 and R 7 = CH 2

CH=CH

2 15 Thus, for example, the recombinant strain S. hygroscopicus MG2-10 can be cultured in the presence of cyclohexane carboxylic acid to produce 9-deoxo-16-O desmethyl-27-desmethoxy-39-desmethoxy-rapamycin (Example 12). It can be seen by one skilled in the art that homologues to rapK in other biosynthetic clusters that encode FKBP-ligands, including, but not limited to, FK506, FK520, FK523, FK525, 20 meridamycin, tsukubamycin, antascomicin and 'hyg' can also be deleted or inactivated allowing efficient feeding of starter unit carboxylic acids leading to the production of novel analogues. In another aspect, S. hygroscopicus strains of the invention (including rapL or rapL homologues or not including rapL or rapL homologues and/or including rapK or 25 rapK homologues or not including rapK or rapK homologues) may be fed with analogues of L-pipecolic acid, as described above, in combination with analogues of the natural 4,5-dihydroxycyclohex-1-enecarboxylic acid starter unit, as described 44 above, to produce rapamycin analogues in which both the starter unit and the pipecolyl residue have been replaced. This approach is exemplified in Examples 10, 11 and 12. The present invention provides a process for producing FKBP-Ugand 5 analogues varying in the extent of post-PKS modification and/or in which the pipecolic acid residue has been replaced, and optionally the starter 4,5 dihydroxycyclohex-1-enecarboxylic acid residue has been replaced. This process comprises the step of deleting or inactivating one or more genes in the microorganism host cell involved in the production of the precursor compound, L 10 pipecolic acid and/or 4,5-dihydroxycyclohex-1-ene carboxylic acid, required for biosynthesis of the rapamycin polyketide/NRPS template and/or in its subsequent post-PKS modification, thereby to suppress the production of the natural product. The process further comprises transforming the microorganism host cells with nucleic acid encoding polyketide-modifying genes to restore polyketide production, culturing 15 the transformed host cells under conditions suitable for polyketide production and optionally isolating the rapamycin analogues produced. The present invention provides a process for the production of FKBP-ligand analogues including, but not limited to FK506, FK520, FK523, FK525, tsukubamycin, antascomicin, meridamycin and 'hyg', varying in the extent of post-PKS modification 20 and/or in which the amino acid residue has been replaced, and optionally the starter unit has been replaced. This process comprises the step of deleting or inactivating one or more genes in the microorganism host cell involved in the production of the precursor amino acid residue and/or starter unit, required for the biosynthesis of the polyketide/NRPS template and/or in its subsequent post-PKS modification, thereby to 25 suppress the production of the natural product. The process further comprises transforming the microorganism host cells with nucleic acid encoding polyketide modifying genes to restore polyketide production, culturing the transformed host cells under conditions suitable for polyketide production and optionally isolating polyketide analogues produced. 30 The present invention provides novel FKBP-ligand analogues. In a further aspect the present invention provides the following FK520 analogues: 31-desmethoxy-FK520, 31-desmethoxy-31-cis-hydroxy-32-trans-hydroxy FK520, 31-desmethoxy-31-cis-hydroxy-32-cis-hydroxy-FK520, 31-desmethoxy-31 trans-hydroxy-32-trans-hydroxy-FK520, 31-0-desmethyl-32-d6hydroxy-FK520, 31-0 35 desmethyl-FK520, 31-deismethoxy-31-methyl-FK520, 31-O-desmethyl-32-dehydroxy 45 32-methyl-FK520, 31 -0-desmethyI-32-dehydrxy-32-fluro-FK52O1 31 -des methoxy 31 -fluoro-FK520, 31 -O-desmethyI-32-dehydroxy-32-choro-FK52O, 31 -desmethoxy 31 -chloro-FK520, 31 -O-desmethyl-32-dehydroxy-32-tert-butyI-FK520, 29-de(3 methoxy-4-hydroxy-cycIohexyl)29(hydroxy-cycoheptyl)-FK 52 0, 29-de(3-methoxy-4 5 hydroxy-cyclohexy)-29-(hydroxyflorborflY)FK520, 9-deoxo-31 -desmethoxy-FK520, 9-deoxo-31I-desmethoxy-31 -cis-hydroxy-32-trans-hydroxy-FK520, 9-deoxo-31 desmethoxy-31I cis-hydroxy-32-cis-hydroxy-FK52O, 9-deoxo-31 -desmethoxy-31 trans-hydroxy-32-trals-hydroxy-FK 52 Oa 9-deoxo-31 -Q-desmethy-32-dehydroxy FK520, 9-deoxo-3 1 -- desmethyl-FK520, 9-deoxo-31-desmethoxy-31 -methyl-FK520. 10 9-deoxo-31I 0Odesmethy-32-dehydroxy-32-methy-FK5 2 Ov 9-deoxo-31 -O-desmethyl 32-dehydroxy-32-fluoro-FK520, 9-deoxo-31 -desmethoxy-31 -fluoro-FK520, 9-deoxo: 31 -O-desmethy-32-dehydroxy-32-chIoro-FK 52 Os 9-deoxo-3 1-desmethoxy-31-choro FK520, 9-deoxo-31 -O-desmethy-32-dehydroxy-32-tert-butyI-FK52O, 9-deoxo-29 de3mtoy4hdoyccoey)-9(yrx-ylhpy)F50 9-deoxo-29 15 de(3-methoxy4hydroxy-cyclohexy)29(hydroxy-norbomyl)-FK 52 0, 30-desmethoxy prolyl-FK520, 3O-desmethoxy-3-cis-hydroxy-31 -trans-hydroxy-prolyl-FK520, 30 desmethoxy-30-cis-hYdroxy- 3 l -cis-hydroxy-prolyl-FK520, 30-desmethoxy-30-trafls hydroxy-3 1 trans-hydroxy-proIyl-FK520, 30-O-desmethyl-31 -dehydroxy-prolyI-FK5 2 O, 30-O-desmethy-prolyl-FK520, 30-desmethoxy-30-ethyl-proIyI-FK5 2 O, 30-0 20 desmethyl-31 -dehydroxy-31 -methyl-prolyl-FK520, 30-0-desmethyl-31 -dehydroxy-3 1 fluoro *p*rolyl-FK520, 30-desmethoxy-30-fluoro-proIyI-FK5 2 O, 30-0-desmethyl-31 dehydroxy-3 1-chloro-prolyI-FK520, 30-desmethoxy-3-choro-proIyI-FK 52 O, 30 desmethyl-3 1-dehydroxy-31 -tert-butyl-proyI-FK520, 28-de(3-methoxy-4-hydroxy cyclohexy)-2Hhydroxy-cycIoheptyI)-FK 52 0, 28-de(3-methoxy4-hydroxy 25 cyclohexy)-28-(hydroxy-lorbrl)-FK 52 O, 8-deoxo-30-desmethoxy-31I-hydroxy prolyl-FK 520, 8-deoxo-3O-desmlethoxy-30-cis-hydroxy- 3 l-trani -hydroxy-proIyi FK2,8doo3-emthx 0cshdoy3-cis-hydrox'y-prolyl-FK520, 8 deoxo-30-desmethoxy-30-trafls-hydroxy- 3 l -trans-hydroxy-prolyI-FK52O, 8-deoxo-30 0-desmethyl-31 -dehydroxy-prolyI-FK520, 8-deoxo-30-0-desmethy-prolyI-FK52O, 8 30 deoxo-30-desmethoxy-30-mthyI-proIyIFK 52 0, 8-deoxo-30-Q-desmlethyl-3l dehydroxy-31 -methyl-prolyl-FK520, 8-deoxo-30-O-desmethyt-31 -dehydroxy-31 fiuora-prolyl-FK520, 8-deoxo-3O-desmethoxy-3O-fiuoro-prolyi-FK 52 O, 8-deoxo-30-Q desmethyl-31 -dehydroxy-31 -chloro-prolyl-FK520, 8-deoxo-30-desmethoxy-30-chloro prolyl-FK520, 8-deoxo-30-O-desmethyl-31I-dehydroxy-31 .tert-butyl-prolyI-FK52O, 8 35 dex-8d(-ehx--yrx-ylhey)2-hdoyccoetl-rll 46 FK520, 8-ex-8d(-ehx4hdoyccoey)2-hdoynroy) prolyi-FK520, 3O-desmethoxy-3-hydroxy-proy-FK5 2 , 30-desmethoxy-30-cis hydroxy-31 -trs-hydroxy-3-hydroxy-prolyi-FK520, 30-desmethoxy-30-cis-hydroxy 31 -cis-hydroxy-3-hydroxy-prolyI-FK52O, 30-desmethoxy-3O-trals-hydrxy-31I-trans 5 hydroxy-3-hydroxy-proIyI-FK520, 30-0Odesmethy31dehydroxy-3-hydroxy-prolyi FK520, 30-O-desmethyl-3-hydroxy-proIyI-FK520, 30-desmethoxy-30-methyl-3 hydroxy-prolyi-FK520, 30-O-desmethyl-31 -dehydroxy-3l -methyl-3-hydroxy-proIyI FK520, 30-O-desmethyl-31 -dehydroxy-31 -fluoro-3-hydroxy-proIyi-FK52O, 30 desmethoxy-30-fluoro-3-hydroxy-proIyI-FK520, 30-O-desmethyl-31 -dehydroxy-31 10 chloro-3-hydroxy-prolyi-FK520, 30-desmethoxy-30-chro-3-hydroxy-pr0IyI-FK 52 0, 30-O-desmethyl-31 -dehydroxy-31 -tert-butyI-3-hydroxy-prolyI-FK52O, 28-de(3 mehx--yrx-ylhxl-8(yrxyccoetl--yrx-rllF50 28 de(3-methoxy4-hydroxy-cyclohexy)2B(hydroxy-norborny)-3hydroxy-prolyi-FK 52 0, 8-cleoxo-30-desmethoxy-31 -hydroxy-3-hydroxy-proIyI-FK52O1 8-deoxo-30 15 desmethoxy-30-cis-hydroxy-3l -trans-hydroxy-3-hydroxy-proIyI-FK5 2

O

1 8-deoxo-30 desmethoxy-30-cis-hydroxy- 3 l -cis-hydroxy-3-hydroxy-proIyi-FK52O. 8-deoxo-30 desmethoxy-30-tras-hydroxy- 3 l -trans-hydroxy-3-hydroxy-prolIt-FK5 2 O. 8-deoxo-30 O-desmethyl-31 -dehydroxy-3-hydroxy-proIyI-FK520, 8-deoxo-30-O-desmethyl-3 hydroxy-prolyl-FK520, 8-ex-0dsehq3-ehy--yrx-rllF50 8 20 deoxo-30-O-desmethyl-31 -dehydroxy-31 -methyI-3-hydroxy-prolyI-FK52O, 8-deoxo 30-O)-desmethyl-31 -dehyciroxy-3 I fluoro-3-hydroxy-proIyl-FK52O, B-deoxo-30 desmethoxy-30fluoro-3-hydroxy-roIyiFK 52 Oi 8-deoxo-30-O-desmethyI-3i dehydroxy-31 -chloro-3hydroxy-proIyI-FK52O, 8-deoxo-30-desmethoxy-30-chIoro- 3 hydroxy73-hydroxy-proIyi-FK5 2

O

1 8-deoxo-30-O-desmethyl-3 1-dehydroxy-31 -tert 25 butyI-3..hydroxy-proyI-FK52O, 8-ex-8d(-ehx--yrx-ylhxl-8 (hydroxy-cyclohepty)-3-hydroxy-proIyIFK 52 0, 8-ex-8dpmtoy4hdoy cyclohexyI)-28-(hydroxyflrbomy)-3hydroxy-proyI.FK 52 Ol 30-desmethoxy-4 hydroxy-prolyt-FK520, 30-desmethxy-30-cis-hydroxy-31 -trans-hydroxy-4-hydroxy prolyl-FK520, 30-desmethoxy-3-cis-hydroxy- 3 1 cis-hydroxy4-hydroxy-prolyk-FK5 2 O, 30 30-desmethoxy-30-trals-hydroxy- 3 1 trans-hydroxy-4-hydroxy-prolyI-FK 52 O, 30-0 desmethyl-31 -dehydroxy-4-hydroxy-proIyi-FK 52

O

1 30-O-desmethy-4-hydroxy-protyi FK520, 30dsehx-0mty4-yrx-rllF50 30-O-desmethyl-31 dehydroxy-31 -methy-4-hydroxy-proIyi-FK5 2 0, 30-O-desmethyl-31I-dehydroxy-31 fluoro-4-hydroxy-prolyI-FK52O, 30-desmethoxy30-fluoro4hydroxy-prolyi-FK 52 Os 30 35 O-desmethyl-3l -dehydroxy-31 -chloro-4-hydroxy-proIyi-FK520, 30-desmethoxy-3 0 47 chloro-4-hydroxy-prolyl-FK52O, 30-O-desmethyl-31 -dehydroxy-31 -tert-butyl-4 hydroxy-prolyl-FK520, 28-de(3-methoxy-4-hydroxy-cyclohexy)-28-(hydroxy cycloheptyl)-4-hydroxy-prolyl-FK520, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28 (hydroxy-norbomyl)-4-hydroxy-prolyl-FK520, 8-deoxo-30-ciesmethoxy-31 -hydroxy-4 5 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-4 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-4 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-trans-hydroxy-31 -trans-h ydroxy-4 hydroxy-prolyl-FK520, 8-deoxo-30-O-desmethyl-31I-dehydroxy-4-hydroxy-proyl FK520, 8-deoxo-30-O-desmethyl-4-hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy 10 30-methyM--hydroxy-prolyl-FK520, 8-deoxo-30-O-desmethyl-31 -dehydroxy-3 1 methyl-4-hydroxy-prolyl-FK520, 8-deoxo-30-O-desmethyl-31 -dehydroxy-31-fiuoro-4 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-fluoro-4-hydroxy-proly-FK520, 8 deoxo-30-O-desmethyl-31 -dehydroxy-31 -chioro-4-hydroxy-prolyl-FK520, 8-deoxo-30 desmethoxy-30-chloro-3-hydroxy-4-hydroxy-prolyl-FK520, B-deoxo-30-O-desmethyl 15 31 -dehydroxy-31 -tert-butyl-4-hydroxy-prolyl-FK520, 8-deoxa-28-de(3-methoxy-4 hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-4-hydroxy-proly-FK520, 8-deoxo-28 de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbomyl)-4-hydrxy-proly-FK520, 31 -desmethoxy-trans-3-bicyclo[3.1I.O.]FK520, 31 -desmethoxy-3 1-cis-hydroxy-32 trans-hydroxy-trans-3-bicyclo[3.1I.O.JFK520, 31 -desmethoxy-31 -cis-hydroxy-32-cis 20 hydroxy-trans-3-bicyclo[3.1I.0.]FK520, 31-desmethoxy-31 -trans-hydroxy-32-trans hydroxy-trans-3-bicyclo[3. 1 .. ]FK520, 31 -O-desmethyt-32-dehydroxy-trans-3 bicyclo(3.1I.O.]FK520, 31 -O-desmethyl-trans-3-bicyclo[3.1I.0.]FK520, 31 -desmethoxy 31 -methyl-trans-3-bicyclo[3. 1. 0.]FK520, 31 -O-desmethyl-32-dehydroxy-32-methyl trans-3-bicyclo[3. 1 .. ]FK520, 31 -O-desmethyl-32-dehydroxy-32-fluoro-trans-3 25 bicyclo[3. 1 .. ]FK520, 31 -desmethoxy-31 -fluoro-trans-3-bicyclo[3.1I.0.JFK520, 31-0 desmethyl-32-dehydroxy-32-chloro-trans-3-bicyclo[3.1I.O.]FK520, 31 -desmethoxy-31 chloro-trans-3-bicyclo[3.1I.0.]FK520, 31 -O-desmethyl-32-dehydroxy-32-tert-butyl trans-3-bicyclo[3.1I.O.]FK520, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-trans-3-bicyclo[3. I.O.]FK520, 29-de(3-methoxy-4-hydroxy-cyclohexyl) 30 29-(hydroxy-norbomyI)-trans-3-bicycloI3.1I.O.]FK520, 9-deoxo-31 -desmethoxy-trans 3-bicyclo[3.1I.O.]FK520, 9-deoxo-3 1-desmethoxy-31-cs-hydroxy-32-trans-hydroxy trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31-desmethoxy-31 -cis-hydroxy-32-cis hydroxy-trans-3-bicyclo[3. 1. 0.]FK520, 9-deoxo-31 -desmethoxy-31 -trans-hydroxy-32 trans-hydroxy-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31 -O-desmethyl-32-dehydroxy 35 trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31 -O-desmethyl-trans-3-bicyclo[3.1I.O.]FK520, 48 9-deoxo-31 -desmethoxy-31 -methyl-trans-3-bicyclo[3. 1 .. ]FK520, 9-deoxo-31 -0 desmethyl-32-dehydroxy-32-ethyl-trans-3-bicycIo[ 3 .I .O.]FK520, 9-deoxo-3 1-0 desmethyl-32-dehydroxy-32-luoro-tran-3-bicyclo[ 3 .1I.O.]FK520, 9-deoxo-31 desmethoxy-31 -fluoro-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31 -0-desmethyl-32 5 dehydroxy-32-choro-tals-3-bicyclo(3. 1. O.JFK520, 9-deoxo-31 -desmethoxy-3I chloro-traris-3-bicycIo[3.1I.O.]FK520, 9-deoxo-3I -0-desmethyl-32-dehydroxy-32-tert butyI-trfls-3-bicycI0[3. 1 .. ]FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cycIohexyI) 29-(hydroxy-cycohepty)-trfls-3-bicycIo[3.1I.O.]FK520, 9-deoxo-29-de(3-methoxy-4 hydroxycyclohexyl)29(hydroxy-lorbomyl)-trls- 3 bicyclo[ 3 .I .O.]FK520, , 10 In a preferred embodiment, the present invention provides the following FK520 analogues: 31 -desmethoxy-31-cis-hydroxy-32-trals-hydroxy-FK 52

O

1 31 desmethoxy-31 -cis-hydroxy-32-cis-hydroxy-FK520, 31 -desmethoxy-3 I -trans hydroxy-32-trans-hydroxy-FK520, 31 -desmethoxy-31 -methyl-FK520, 31 -desmethoxy 31 -fluoro-FK520, 31 -desmethoxy-31 -chloro-FK520, 31 -0-desmethyl-32-dehydroxy 15 32-tert-butyl-FK520, 29-de(3-methoxy4hydroxy-cycIohexyl)-29-(hydroxy cycloheptyl)-FK520, 29d(-ehx--yrx-yloey)2-hdoynroy) FK520, 9-ex-1dsehx-1cshyrx-2tashdoyF50 9-deoxo 31 -desmethoxy-31 .. cis-hydroxy-32-cis-hydroxy-FK520, 9-deoxo-31 -desmethoxy-31 trans-hydroxy-32-trans-hydroxy-FK5 2 O, 9-deoxo-31 -desmethoxy-31 -methyl-FK520, 20 9-deoxo-3 1-desmethoxy-31 -fluoro-FK520, 9-deoxo-31I-desmethoxy-31 -chloro-FK520, 9-deoxo-31 -O-desmethy-32-dehydroxy-32-tert-buty-FK 52 O, 9-deoxo-29-de(3 mehx--yrx-ylhxl-9(yrx-ylhpy)F50 9-dleoxo-29-dle(3 mehx--yrx-ylhxl-2-hdoynroy)F50, 30-desmethoxy-30 cis-hydroxy-3 1-trans-hydroxy-protyI-FK5 2 O, 30-desmethoxy-30-cis-hydroxy-3l -cis 25 hydroxy-prolyl-FK520, 30-desmethoxy-30-tras-hydroxy-3l -trans-hydroxy-prolyl FK520, 3O-desmethoxy-3O-methy-proIl-FK 52 O, 30-desmethoxy-30-fluoro-prolyi FK520, .3O-desmethoxy-3O-chloro-proyI-FK 52 O, 30.desmethyl-31 -dehydroxy-31 -tert butyl-prolyl-FK520, 28-de(3-methoxy4hydroxy-cyclohexyI)-28-(hydroxy cycloheptyl)-FK520, 28d(-ehx--yrx-yloey)2-hdoynroy) 30 FK520, 8-deoxo-30-desmethoxy- 3 l -hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy 30-cis-hydroxy-31I trans-hydroxy-prolyI-FK52O, 8-deoxo-30-desmethoxy-30-cis hydroxy-31 -cis-hydroxy-prolyI-FK520, 8-deoxo-3O-desmethoxy-3-trals-hydroxy-3l trans-hydroxy-prolyl-FK520, 8-deoxo-30-0-desmethyl-31 -dehydroxy-prolyl-FK520, 8 deoxo-30-0-desmethyl-prolyi-FK520, 8-deoxo-3O-desmethoxy-3-methy-prolyI 35 FK520, 8-deoxo-3O-0-desmethy-31 -dehydroxy-31 -methyl-prolyl-FK520, 8-deoxo-30 49 O-desmethyl-31 -dehydroxy-31I-fluoro-prolyl-FK520, 8-deoxo-30-desmethoxy-30 fluoro-prolyl-FK520, 8-deoxo-30-O-desmethyl-3 1 -dehydroxy-31 -chloro-prolyI-FK520, 8-deoxo-3O-desmethoxy-3-choro-proIyi-FK52O, 8-deoxo-30-O-desmethyl-31 dehydroxy-31I-tert-butyl-prolyl-FK520, 8-deoxo-28-de(3-methoxyA-hydroxy 5 cyclohexy)-28(hydroxy-cycIoheptyI)-proIyI-FK 52 O, 8-deoxo-28-de(3-methoxy-4 hydroxy-cyclohexy)28(hydroxy-lorbomyI)-proIyiFK 52 0. 30-desmethoxy-3-hydroxy prolyl-FK520, 30-desmethoxy-30-cis-hydroxy-3l -trans-hydroxy-3-hydroxy-proIyI FK520, 30-desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-3-hydroxy-prolyI-FK52O, 30 desmethoxy-30-trans-hydroxy- 3 1I trans-hydroxy3-hydroxy-proIyi-FK5 2

O

1 30-0 10 desmethyl-31 -dehydroxy-3-hydroxy-prolyl-FK52O, 30-0-desmethyl-3-hydroxy-proIyi FK520, 30dsehx-0mty--yrx-rliF50 30-0-desmethyl-31 dehydroxy-31I methyI-3-hydroxy-prolyI-FK52O. 30-0-desmethyl-31 -dehydroxy-31 fluoro-3-hydroxy-prolyi-FK520, 30.desmethoxy30-fluoro-3-hydroxy-proIyI-FK 52 O, 30 O-desmethyl-31 -dehydroxy-31I chloro-3-hydroxy-proIyI-FK520, 30-desmethoxy-30 15 chloro-3-hydroxy-prolyI-FK520, 30-0-desmethyl-31 -dehydroxy-31 -tert-butyt-3 hydroxy-prolyl-FK520, 28d(-ehx--yrx-ccoey)2-hdoy cycloheptyl)-3-hydroxy-proIyI-FK 520 , 28-de(3-methoxy-hydroxy-cycIohexy) 2 8 (hydroxy-norbomyl)3hydroxy-proIyI-FK5 2 O, 8-deoxo-3-desmethoxy-3 1-hydroxy-3 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-cis-hydroxy- 3 l-trans-hydroxy-3 20 hydroxy-prolyl-FK520, 8-deoxo-3O-desmethoxy-3O-cis-hydroxy- 3 l-cis-hydroxy-3 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-trals-hydroxy- 3 l-trans-hydroxy-3 hydroxy-prolyl-FK520, 8-deoxo-30-0-desmethyI-3l -dehydroxy-3-hydroxy-proIyi FK520, 8-deoxo-30-0-desmethy3-hydOroyIpolFK 52 0, 8-deoxo-30-desmethoxy 30-methy-3-hydroxy-proIyI-FK52O. 8-deoxo-30-0-desmethyl-31 -dehydroxy-31 25 methyl-3-hydroxy-proly-FK52O 1 8-deoxo-30-0-desm~ethyl-31 -dehydroxy-31I-fluoro-3 hydroxy-prolyl-FK520, B-ex-0dsehx-0fur--yrx-rllF50 8-.. deoxo-30-0-desmethyl-31 -dehydroxy-31I-chloro-3-hydroxy-proly-FK520, 8-deoxa-30 demtoy3-hoo3hdox--yrx-rliF50 8-de.oxo-30-0-desmlethyl 31 -dehydroxy-31 -tert-butyI-3-hydroxy-prolyl-FK520, 8-deoxo-28-de(3-methoxy-4 30 hyrx-ylhxl-8(yrx-ycoetl--yrx-rllF50 8-deoxo-28 de3mtoy-yrx-ylhxl-8(ydoynronl--yrx-rllF50 30-desmethoxy-4-hydroxy-proIyI-FK 52 O, 30-desmethoxy-30-cis-hydroxy- 3 l -tranis hydroxy-4-hydroxy-proly-FK52O 3 30-desmethoxy-3-cis-hydroxy-31 -cis-hydroxy-4 *hydroxy-prolyl-FK520, 3O-desmethoxy-30-tals-hydroxy-3I -trns-hydroxy-4-hydroxy 35 prolyl-FK520, 30-0-desmethyl-31 -dehydroxy-4-hydroxy-proIyi-FK520, 30-0 50 desmethyl-4-hydroxy-prolyl-FK520, 3O-desmethoxy-3O-methy-4-hydroxy-proIyI FK520, 30-O-desmethyl-31 -dehydroxy-31 -methyl-4-hydroxy-prolyl-FK520, 30-0 desmethyl-31 -dehydroxy-31 -fluoro-4-hydroxy-prolyJ-FK520, 30-desmethoxy-30 fluoro-4-hydroxy-prolyl-FK520, 30-0-desmethykl1-dehydroxy-31 -chloro-4-hydroxy 5 prolyl-FK520, 30-desmethoxy-30-chloro-4-hydroxy-prolyI-FK520, 30-O-desmethyl-31 dehydroxy-31 -tert-butyl-4-hydroxy-prolyl-FK520, 28-de(3-methoxy-4-hydroxy cyclohexyl)-28-(hydroxy-cycIohepty)-4-hydroxy-proIyI-FK520, 28-de(3-methoxy-4 hydroxy-cyclohexy)-28-(hydroxy-lorborl)-4-hydroxy-prolyI-FK520, 8-deoxo-30 desmethoxy-31 -hydroxy-4-hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-cis 10 hydroxy-31 -trans-hydroxy-4-hydroxy-prolyl-FK520, 8.-deoxo-30-desmetloxy-30-cis hydroxy-31 -cis-hydroxy-4-hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-trafls hydroxy-3 1-trans-hydroxy-4-hydroxy-prolyI-FK520, 8-deoxo-30-O-desmethyl-31 dehydroxy-4-hydroxy-prolyl-FK520, 8-deoxo-30-O-desmethyl-4-hydroxy-proIyI-. FK520, 8-deoxo-3O-desmethoxy-3-methy-4-hydroxy-prolyI-FK520, B-deoxo-30-0 15 desmethyl-31 -dehydroxy-31 -methyl-4-hydroxy-prolyl-FK520, 8-deoxo-30-Q desmethyl-31I-dehydroxy-31 -fluoro-4-hydroxy-prolyI-FK520, 8-deoxo-30-desmethoxy 30-fl uoro-4-hydroxy-prolyl-FK520, 8-deoxo-3O-O-desmethyl-31 -dehydroxy-31 -chioro 4-hydroxy-prolyi-FK520, 8-deoxo-3O-desmethoxy-30-cIoro-3-hydroxy-4-hydoxy prolyl-FK520, 8-deoxo-30-O-desmethyl-31 -dehydroxy-31 .tert-butyl-4-hydroxy-prolyI 20 FK520, 8-ex-8d(-ehx--y~oycclhxl-8(yrx-ylhpy)4 hydroxy-prolyl-FK520, 8-ex-8d(-ehx--yroyccoey)2-hdoy norbomyl)-4-hydroxy-prolyI-FK520, 31 -desmethoxy-trans-3-bicyco[3. 1 .O.FK52O, 31 desmethoxy-31 -cis-hydroxy-32-trals-hydroxy-trals-3-bicycIo[3. 1 .. ]FK520, 31 desmethoxy-31 -cis-hydroxy-32-cis-hydroxy-trals-3-bicycIo[3. 1 .. ]FK520, 31 25 desmethoxy-31 -trans-hydroxy-32-trans-hydroxy-tras-3-bicycIo[3.1I.0.1FK520, 31-0 desmethyl-32-dehydroxy-trals-3-bicycIo[3.1I.0.]FK520, 31 -O-desmethyl-tmans-3 bicyclo[(3.1 .0.]FK520, 31 -desmethoxy-31 -methyl-trans-3-bicycio[3. 1.0.]FK520, 31-0 desmethyl-32-dehydroxy-32-ethyI-tral3-3-bicycIo[3. 1.0.]FK520, 31 -0-desmethyl 32-dehydroxy-32-fluoro-tras-3-bicycIo[3. 1.0.]FK520, 31 -desmethoxy-31 -fluoro-trans 30 3-bicyclo[3.1I.0.]FK520, 31 -O-desmethyI-32-dehydroxy-32-chloro-trafls-3 bicyclo[3.1I.O.]FK520, 31 -desmethoxy-31 -chloro-trans-3-bicyclo[3. 1. O.JFK520, 31-0 desmethy-32-dehydroxy-32-tet-buty-trafls-3-bicycIo[3.1I.O.]FK520, 29-de(3 methoxy4-hydroxycycohexy)-29-(hydroxy-cycIohepty)-trals- 3 bicyclol3.1I.0.]FK520, 29-de(3-methoxy-4-hydroxy-cycohexy)-29-(hydroxy 35 norbornyl)-trans-3-bicyc1o[3.1I.0.]FK520, 9-deoxo-3 1-desmethoxy-trans-3 51 bicyclo[3. 1 .. ]FK520, 9-deoxo-31 -desmethoxy-31 -cis-hydroxy-32-trans-hydroxy trans-3-bicyclo[3. 1 .. ]FK520, 9-deoxo-31 -desmethoxy-31 -cis-hydroxy-32-cis hydroxy-trans-3-bicyclo[30.].FK520, 9-deoxo-3 1-desmethoxy-31I-trans-hydroxy-32 trans-hydroxy-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31 -O-desmethyl-32-dehydroxy 5 trans-3-bicyclo[3. 1 .. ]FK520, 9-deoxo-31 -O-desmethyl-trans-3-bicyclo[ 3 .1I.O.]FK520, 9-deoxo-31 -desmethoxy-31 -methyl-trans-3-bicyclo[3. 1. 0.]FK520, 9-deoxo-31 -0 desmethyl-32-dehydroxy-32-methyl-tras-3-bicyclo[ 3 . I .0.]FK520, 9-deoxo-31 -0 desmethyl-32-dehydroxy-32-fluoro-tras-3-bicycIo[3.1I.O.JFK520, 9-deoxo-31 desmethoxy-31 -fluoro-trans-3-bicyclo[3. 1 .O.FK520, 9-deoxo-31 -0-desmethyl-32 10 dehydroxy-32-chloroals-3-bICycIo[3.1I.O.]FK520, 9-deoxo-31 -desmethoxy-31 chloro-trans-3-bicyclof3.1I.O.]FK520, 9-deoxo-31 -0-desmethyl-32-dehydroxy-32-tert butyl-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl) 29-(hydroxy-cycloheptyl)-tras-3-bicycIo[3.1I.O.]FK520, 9-deoxD-29-de(3-methoxy-4 hydroxy-cycohexy)29-(hydroxy-orborfl)-tras-3-bicyclo[3. 1 .O.]FK520, 15 In a more highly preferred embodiment, the present invention provides the following novel FK520 analogues: 31 -desmethoxy-31 -methyl-FK520, 31 desmethoxy-31 -fluoro-FK520, 31 -desmethoxy-31 -chloro-FK52O, 31 -0-desmethyl-32 dehydroxy-32-tert-butyl-FK520, 29-de(3-methoxy4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-FK520, 29d(-ehx4hdoy6coey)2-hdoynroy) 20 FK520, 9-deoxo-31 -desmethoxy-31 -methyl-FK520, 9-deoxo-31 -desmethoxy-3 1 fluoro-FK520, 9-deoxo-31 -desmethoxy-31 -chloro-FK520, 9-deoxo-31 -0-desmethyl 32.dehydroxy-32-tert-butyl-FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyI) 29-(hydroxy-cycloheptyl)-FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl) 29-(hydroxy-norbomy)-FK520, 30-desmethoxy-30-methy-prolyl-FK520, 30 25 desmethoxy-30-fluoro-protyl-FK520, 30-desmethoxy-30-chloro-prolyI-FK520, 30 desmeth yl-31 -dehydroxy-31 -tert-butyl-prolyl-FK520, 28-de(3-methoxy-4-hydroxy cyclohexyl)-28-(hydroxy-cycIoheptyI)-FK520, 28-de(3-methoxy-4-hydroxy cyclohexyl)-28-(hydroxy-norboml')-FK520, 8-deoxo-30-desmethoxy-31 -hydroxy prolyl-FK520, 8-deoxo-30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-prolyl 30 FK520, 8-deoxo-30-desmethoxy-30-cis-hydroxy-31 .cis-hydroxy-prolyl-FK520, 8 deoxo-30-desmethoxy-30-trals-hydroxy-3l -trans-hydroxy-prolyl-FK520, 8-deoxo-30 0-desmethyl-3I -dehydroxy-prolyI-FK520, 8-deoxo-30-0-desmethyl-proly-FK52O, 8 deoxo-30-desmethoxy-30-methyl-prolyl-FK520, 8-deoxo-30-0-desmethyl-31 dehydroxy-31I-methyl-prolyl-FK520, 8-deoxo-30-0-desmethyl-31I-dehydroxy-SI 35 fluoro-prolyl-FK520, 8-deoxo-30-desmethoxy-30-fluoro-proyl-FK520, B-deoxo-30-0 52 desmethyl-3 1-dehydroxy-31 -chloro-prolyl-FK520, 8..deoxo-30-desmethoxy-30-choro prolyi-FK520, 8-deoxo-30-O-desmethyl-3 1-dehydroxy-31 -tert-butyl-prolyl-FK520, 8 dex-8d( ehx--yrx-ylhey)2-hdoyccoetl-rll FK520, 8-ex-8d(-ehx--yrx-ccoey)2-hdoynroy) 5 prolyi-FK520, 30-desmethoxy-3-hydroxy-proly-FK520, 30-desmethoxy-30-cis hydroxy-31 -trans-hydroxy-3-hydroxy-prolyt-FK520, 30-.desmethoxy-30-cis-hydroxy 31 -cis-hydroxy-3-hydroxy-prolyI-FK520, 30-desmethoxy-30-trans-hydroxy-31 -trans hydroxy-3-hydroxy-proIyi-FK520, 30-O-desmethyl-31 -dehydroxy-3-hydroxy-prolyI FK520, 30-Q-desmethyl-3-hydroxy-prolyI-FK520, 30-desmethoxy-30-methyl-3 10 hydroxy-prolyl-FK520, 30-O-desmethyl-31 -dehydroxy-31 -methyl-3-hydroxy-prolyI FK520, 30-O-desmethyl-31 -dehydroxy-31 -fiuoro-3-hydroxy-prolyl-FK520, 30 desmethoxy-3-fluro-3-hydroxy-proly-FK520, 30-O-desmethyl-31 -dehylroxy-31 chloro-3-hyqroxy-prolyi-FK520, 3O-desmethoxy-30-chro-3-hydroxy-proIyI-FK52O, 30- O-desmethyl-31 -dehydroxy-31 .tert-butyl-3-hyciroxy-prolyI-FK520, 28-de(3 15 mehx--yrx-ylhxo2-hdoyccoetl--yrx-rllF50 28 de3mtoy4hdoyccoey)2 (yrx-obml--yrx-rllF50 8-deoxo-30.-desmethoxy-31I-hydroxy-3-hydroxy-prolyI-FK520. 8-deoxo-30 desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-3-hydroxy-pOly-FK52O, 8-deoxo-30 desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-3-hydroxy-prolyI-FK520, 8-deoxo-30 20 desmethoxy-30-trans-hydroxy-3l -trans-hydroxy-3-hydroxy-prolyI-FK520, 8-deoxo-30 O-desmethyl-31 -dehydroxy-3-hydroxy-proIyI-FK520, 8-deoxo-30-O-desmethyl-3 hydroxy-prolyt-FK520, 8-deoxo-30-desmethoxy-30-ethyI-3-hydroxy-proIyI-FK5 2 O, 8 deoxo-30-O-desmethyl-3l -dehydroxy-31 -methyl-3-hydroxy-prolyl-FK520, 8-deoxo 30-O-desmethyl-31 -dehydroxy-31I-fluoro-3-hydroxy-prolyl-FK520, 8-deoxo-30 25 desmethoxy-30fluoro-3-hydroxy-pr0Iyi-FK520, 8-deoxo-30-O-desmethyl-31 dehydroxy-31 -chloro-3-hydroxy-proIyi-FK520, 8-deoxo-30-desmethoxy-30-chlorO-3 hydroxy-3-hydroxy-proyi-FK52O, 8-deoxo-3D0O-desmethyl-31 -dehydroxy-31 -tert butyl-3-hydroxy-proly-FK520, 8-deoxo-28-de(3-methoxy-4-hydroxy-cycIohexyI)-2 8 (hydroxy-cyclohepty)-3-hydroxy-prolyi-FK520, 8-deoxo-28-de(3-methoxy-4-hydroxy 30 cycbohexy)-28-(hydroxy-lorbomyI)-3-hydroxy-prolyIFK52O. 30-desmethoxy-4 hydroxy-prolyl-FK520, 30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy4-hydroxy prolyl-FK520, 30-desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-4-hydroxy-proyi-FK52O1 30-desmethoxy-30-tras-hydroxy-3l -trans-hydroxy-4-hydroxy-proly-FK520, 30-0 desmethyl-31 -dehydroxy-4-hydroxy-proIyi-FK520, 30-0-desmethy-4-hydro)y-proIyi 35 FK520, 30-desmethoxy-30-ethy-4-hydro)Cy-proIyI-FK520, 30-0-desmethyl-31 53 dehydroxy-31 -methy--hydroxy-prolyf-FK520, 30-O-desmethYl-31 -dehydroxy-31 fluoro-4-hydroxy-prolyi-FK520, 30-desmethoxy-3-fluoro-4-hydroxy-prolyI-FK520, 30 O-desmethyl-31 -dehydroxy-31-chloro-4-hydroxy-prolyI-FK52 0 , 30-desmethoxy-30 chloro-4-hydroxy-proyI-FK520, 30-O-desmethykl- dehydroxy-31 -tert-butyl-4 5 hydroxy-prolyi-FK520, 28-de(3-methoxy-4-hydroxy-cycIohexyI)-28-(hydroxy cycloheptyl)4-hydroxy-prolyI-FK520, 28-de(3-methoxy4hydroxy-cycIohexyI)-28 (hydroxy-norbomfyl)-4-hydroxy-prolyi-FK520, 8-deoxo-30-desmethoxy-31 -hydroxy-4 hydroxy-proly-FK520, 8-deoxo-30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-4 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-Cis-hydroxy-31 -cis-hydroxy-4 10 hydroxy-prolyl-FK520, 8-deoxo-30-desmethoxy-30-tfls-hydroxy-31I-trans-hydroxy-4 hydroxy-prolyl-FK520, 8-deoxo-30-O-desmethyl-31 -dehydroxy-4-hydroxy-prolyl FK520, 8-deoxo-3O-O-desmethy-4-hydroxy-proIyl-FK52O, 8-deoxo-30-desmethoxy 30-methyl-4-hydroxy-prolyt-FK520, 8-deoxo-30-O-desmethyl-31I-dehydroxy-31 methyl-4-hydroxy-proyI-FK520, 8-deoxo-30-O-desmethyl-31 -dehydroxy-31 -fluoro-4 15 hydroxy-prolyl-FK520, 8-deoxo-3O-desmethoxy30-fluoro-4-hydroxy-prolyI-FK 52 O, 8 deoxo-30-O-desmethyl-31 -dehydroxy-31 -chloro-4-hydroxy-prolyI-FK520, 8-deoxo-30 desmethoxy3choro-3-hydroxy-4-hydroxy-proIyI-FK 52 O, 8-deoxo-30-O-desmethyl 31 -dehydroxy-31I-tert-butyl-4-hydroxy-prolyI-FK520, 8-deoxo-28-de(3-methoxy-4 hydroxy-clohexy)-28(hydroxy-cyCIohepty)4-hydroxy-roIylFK 52 0, 8-deoxo-28 20 de3mtoy4hdoyccoey)2-hyrx-obml--yrx-rllF50 31 -desmethoxy-tras-3-bICYCIo[3. 1.0.]FK520, 31 -desmethoxy-31 -cis-hydroxy-32 trans-hydroxy-trans-3-bicycIo[3. 1 .. ]FK520, 31 -desmethoxy-31 -cis-hydroxy-32-cis hydroxy-trans-3-bicycIo[3. 1.0.]FK520, 31 -desmethoxy-31 -trans-hydroxy-32-t rans hydroxy-trans-3-bicycIo[3.1I.O.]FK520, 31 -O-desmethyl-32-dehydroxy-trals-3 25 bicyclo[3.1 .O.]FK520, 31-O-desmethyl-trans-3-bicycIo[3.1 .0.]FK520, 31-desmetioxy 31 -methyl-trans-3-bicyclo[3.1I.O.]FK520, 31 -O-desmethyI-32-dehydroxy-32-methYI trans-3-ticyclo[ 3 .1I.O.]FK520, 31 -O-desmethy-32-dehydroxy-32-fiuoro-trafls- 3 bicyclo[3.1I.0.]FK520, 31 -desmethoxy-31 -fluoro-trans-3-bicyclo[3.1I.0.]FK520, 31-0 desmethy-32-dehydroxy-32-chlro-trals-3bicycIo[ 3 .1I.0.]FK520, 31 -desmethoxy-31 30 chloro-trans-3-bicycIoI3.1I.O.]FK520, 31 -O-desmethyI-32-dehydroxy-32-tet-butyI trans-3-blcyclo[3.1I.0.]FK520, 29-de(3-methoxy--hydroxy-CycIohexyI)-29-(hydroxy cycloheptyl)-trns-3-bicycIo[ 3 .1I.O.]FK520, 29-de(3-methoxy-hydroxy-cycIohxyI) 29-(hydroxy-norbomy)-tra7s-3-bicycIo[3.1I.0.]FK520, 9-deoxo-31 -desmethoxy-traflS 3-bicyclo[3.1I.0.]FK520, 9-deoxo-31 -desmethoxy-31cis-hydroxy-32-trafls-hydroxy 35 trans-3-bicyclo[3.1I.O.]FK520, 9.eoxo-31I-desmethoxy-31 -cis-hydroxy-32-cis 54 hydroxy-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-3 1-desmethoxy-31 -trans-hydroxy-32 trans-hydroxy-trans-3-bicyclo[3.1I.O.JFK520, 9-deoxo-31 -O-desmethyl-32-dehydroxy trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-3l -O-desmethyl-trans-3-bicydlo[3.1I.O.]FK520, 9-deoxo-31 -desmethoxy-31 -methyl-trans-3-bicyclo(3.1I.O.]FK520, 9-deoxo-31 -0 5 desmethyl-32-dehydroxy-32-methyl-trals-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31 -0 desmethyl-32-dehydroxy-32-fluoro-tras-3-bicycIo[3. 1. O.]FK520, 9-deoxo-31 desmethoxy-31 -fluoro-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31 -0-desmethyl-32 dehydroxy-32-chloro-trans-3-bicyclo(3. 1.O.]FK520, 9-deoxo-31 -desmethoxy-3 1 chloro-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-31 -0-desmethyl-32-dehydroxy-32-tett 10 butyl-trans-3-bicyclo[3.1I.O.]FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cycIohexyI) 29-(hydroxy-cycloheptyl)-trals-3-bicycIoI3. 1 .. ]FK520, 9-deoxo-29-de(3-methoxy-4 hydroxy-cyclohexyl)29(hydroxy-noborl)-tras-3-bicyclo[ 3 .I .O.]FK520. In a further aspect the present invention provides the following FK506 analogues: 31 -desmethoxy-FK5OB, 31 -desmethoxy-31 -cis-hydroxy-32-trans-hydroxy 15 FK506, 31 -desmethoxy-31 -cis-hydroxy-32-cis-hydroxy-FK506, 31 -desmethoxy-31 trans-hydroxy-32-trans-hydroxy-FK506, 31 -0-desmethyl-32-dehydroxy-FK506, 31 -0 desmethyl-FK506, 31 -desmethoxy-31 -methyl-FK506, 31-O-desmethyl-32-dehydroxy 32-methyl-FK506, 31 .O-desmethy-32-dehydroxy-32-fluoro-FK5O6, 31-desmethoxy 31 -fluoro-FK506, 31 -O-desmethyI-32-dehydroxy-32-chloro-FK5Q6, 31 -desmethoxy 20 31 -chloro-FK506, 31 -O-desmethyl-32-dehydroxy-32-tet-butyl-FK5O 6 , 29-de(3 methoxy-4-hydroxycyclohexy)-29-(hydroxy-cycloheptyl)-FK 5

O

6 , 29-de(3-methoxy-4 hydroxy-cyclohexy)-29-(hydroxy-lorbomfyl)-FK5Q6, 9-deoxo-31 -desmethoxy-FK506. 9-deoxo-31 -desmethoxy-31 -cis-hydroxy-32-trans-hydroxy-FK506, 9-deoxo-31 desmethoxy-31 -cis-hydroxy-32-cis-hydroxy-FK5O6, 9-deoxo-31 -desmethoxy-3 1 25 trans-hydroxy-32-rans-hydroxy-FK5OG, 9-deoxo-31 -O-desmethyl-32-dehydroxy FK506, 9-deoxo-31 -O-desmethyl-FK506, 9-d~oxo-31 -desmethoxy-31 -methyi-FK506, 9-deoxa-31 -0-desmethyl-32-dehydroxy-32-methyl-FK5O6, 9-deoxo-31I-0-desmethyl 32-dehydroxy-32-fluoro-FK506, 9-deoxo-31 -desmethoxy-31 -fluoro-FK506, 9-deoxo 31 -O-desmethy-32-dehydroxy-32-chloro-FK5O6, 9-deoxo-31 -desmethoxy-31 -chloro 30 FK506, 9-deoxo-31-O-desmethyl-32-dehydroxy-32-ter-butyI-FK5O6, 9-deoxo-29 de(3-methoxy4hydroxy-cyclohexyl)-29-(hydroxy-cycloheptyl)>FK 5 0 6 , 9-deoxo-29 de(3-methoxy4hydroxy-cyclohexyl)-29-(hydroxy-lorbomyl).FK5O 6 , 30-desmethoxy Prolyl-FK5OS, 30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-prolyl-FK506, 30 desmethoxy-30-cis-hydroxy- 3 l -cis-hydroxy-prolyl-FK506, 30-desmethoxy-30-trafls 35 hydroxy-31 -trans-hydroxy-prolyl-FK506, 30-0-desmethyl-31 -dehydroxy-prolyl-FK506, 55 30-O-desmethyl-pro[yIFK506, 3O-desmethoxy3-methyI-proIyI-FK5O 6 , 30-0 desmethyl-31 -dehydroxy-31 -methyl-prolyI-FK506, 30-O-desmethyl-31-dehydroxy- 3 I fluoro-prolyl-FK506,.30-desmethoxy30-fluro-proIyI-FK 5

O

6 , 30-O-desmethyl-3l dehydroxy-31 -chloro-prolyI-FK506, 30-desmethoxy30-choro-proIyi-FK506, 30-0 5 desmethyl-31 -dehydroxy-31 -tert-butyI-prolyI-FK506, 28-de(3-methoxy-4-hydroxy cyclohexyl)-28-(hydroxy-cycIoheptyl)FK 506 , 28-de(3-methoxy-4-hydroxy cyclohexy)-28-(hyiroxy-florboml)-FK 5

O

6 , 8-deoxo-30-desmlethoxy-31 -hydroxy prolyi-FK506, 8-deoxo-30-desmethoxy-30-cis-hydroxy- 3 l-trans-hydroxy-prolyl FK506, 8Bcieoxo-3O-desmethoxy-30-cis-hydroxy- 3 I-cis-hydroxy-protyl-FK506, 8 10 dex-Ddsehx-0tashdoy3-rn-yrx-rllF56 8-deoxo-30-, 0-desmethyl-31 -dehydroxy-prolyl-FK506, 8-deoxo-30-O-desmethyI-prIyI-FK 5

O

6 , 8 deoxo-30-desmethoxy-30-methyI-proIyiF K506, 8-deoxo-30-O-desmethyt-31 dehydroxy-31 -methyl-prolyl-FK506, 8-deoxo-30-0-desmfethyt-31 -dehydroxy-31 fluoro-prolyi-FK506, B-ex-0dsehx-0-loopo*IF56 8-deoxo-30-0 15 desmethyl-31 -dehydroxy-31 -chloro-prolyl-FK506, 8-deoxo-3D-desmethoxy-30-horo prolyl-FK506. 8-deoxo-30-0-desmlethyI-31 -dehydroxy-31 -tert-butyI-prolyI-FK506, 8 dex-8d(-ehxAhdoyccoey)2- doyccoetl-rll FK506, 9-ex-8d(-ehx--yrx-ccoey)2-hdoynroy) prolyl-FK506, 30-desmethoxy3-hydroxy-proIyi-FK50 6 , 30-desmethoxy-30-cis 20 hydroxy-31 -trans-hydroxy-3-hyd roxy-proIyI-FK5O 6 , 30-desmethoxy-30-cis-hydroxy 31 -cis-hydroxy-3-hydroxy-proIyi-FK5O 6 , 3O-desmethoxy-30-trals-hydroxy- 3 1I-trafls hydroxy-3-hydroxy-protyi-FK5O 6 , 30-0-desnethyl-31 -dehydroxy-3-hydroxy-proIyI FK506, 300dsehl3hdrx-rliF56 30-desmethoxy-30-methyl- 3 hydroxy-prolyl-FK506, 30-0-desmethyl-31 -dehydroxy-31 -methyI-3-hydroxy-prolyl 25 FK5OS, 30-0-desmethykl-3 -dehydroxy-31 -fluoro-3-hydroxy-prolyi-FK506, 30 desmethoxy30fluoro-3-hydroxy-prolylFK5O 6 , 30-O-desmeUty-31-dehydroxy- 3 I chloro--hydroxy-prolyI-FK5O 6 , 30-desmethoxy30-chloro-3-hydroxy-proIyI-FK 5 0 6 , 30-0-desmethyl-31 -dehydroxy-:31- tert-butyl-3-hydroxy-protyi-FK 5 06, 28-de(3 mehx4hdoyccoey)2-hdox-ylhpy--yrx-rllF56 28 3D de3mtoy4hdoyccoey)2-hdoynronl--yrx-rllF56 8-deoxo-3O-desmethoxy-31 -hydroxy-3-hydroxy-proIyI-FK5O 6 , 8-deoxo-30 desmethoxy-30-cis-hydroxy-3l -trans-hydroxy-3-hydroxy-proIyI-FK5O 6 , 8-deoxo-30 desmethoxy-30-cis-hydroxy- 31 -cis-hydroxy-3-hydroxy-proIyi-FK5O 6 , 8-deoxo-30 desmethoxy-30-tras-hydroxy- 3 l trans-hydroxy-3-hydroxy-proyI-tFK5O 6 , 8-deoxo-30 35 O-desmethyl-31 ;dehydroxy-3-hydroxy-proIyi-FK5O 6 , 8-deoxo-30-O-desmethy 56 hydroxy-prolyl-FK506, 8-ex-0dsehx-0mty--yrx-rllF56 8 deoxo-30-O-desmethyl-3l -dehydroxy-31I methyI-3-hydroxy-pr0IyIFK5O 6 , 8-deoxo 30-Q-desmethyl-31 -dehydroxy-31 -fluoro-3-hydr0xy-prolyI-FK5O6, 8-deoxo-30 desmethoxy3f1uoro-3-hydroxy-proIyI-FK 5 0 6 , 8-deoxo-30-O-desmethyl-3l 5 dehydroxy-3 1-chloro-3-hydroxy-proIyI-FK50 6 , 8-deoxo-3O-desmethoxy-3O-chIoro-3a hydroxy-3-hydroxy-proIyi-FK 5 O6, 8-deoxo-3O-O-desmlethyI- 3 l -dehydroxy-31 -tert butyI-3-hydroxy-prolyl-FK5O 6 , 8-deoxo-28-de(3-methoxy4hydroxy-cyclohexyI)- 2 8 (hydroxy-cyclohepty)3hydroxy-proIylIFK 5 0 6 , 8-deoxo-28-de(3-methoxy-4-hydroxy cyclohexy)-28-(hydroxy-florbomyl)-3hydroxy-prolylIFK 5 0 6 , 30-desmethoxy-4 10 hydroxy-prolyl-FK506, 3O-desmethoxy-3-is-hydroxy- 3 l trans-hydroxy-4-hydroxy prolyl-FK506, 30-desmethoxy-3-cis-hydroxy- 3 l cis-hydroxy-4-hydroxy-proIyI-FK 5 0 6 . 3O-desmethoxy-30-trals-hydroxy' 3 l -trans-hydroxy-4-hydroxy-prolyi-FK 5

O

6 , 30-0 desmethyl-31 -dehydroxy-4-hydroxy-proIyl-FK 5

O

6 , 30-O-desmethy-4-hydroxy-proIyI FK506, 30dsehx-0mty--yrx-rllF56 30-O-desmethyl-31 15 dehydroxy-31 -methyk4-hydroxy-proIyI-FK 5 O$, 3O--desmethyI-31 .dehydroxy-31 -. fluoro-4-hydroxy-proIyI-FK5OB, 30-desmethoxy-30-fluoro4hydroxy-proIyi-FK 5 0 6 , 30 O-desmethyl-31 -dehydroxy-31 -chloro-4-hydroxy-prolyi-FK5O 6 , 30-desmethoxy-30 chloro-4-hydroxy-proIyI-FK 5

O

6 , 30-O-desmethyl-31 -dehydroxy-31 -tert-butyl-4 hydroxy-prolyl-FK506, 2 8-de(3-methoxy4hydroxy-cycIohexyl)- 28- (hydro(y. 20 cycloheptyl)4-hydroxy-proIyI-FK 5 0 6 , 28-de(3-methxy-4-hydroxy-cycIohexyl)- 28 (hydroxy-norbomy)-4-hydroxy-proIylFK 5 0 6 , 8-deoxo-30-desmethoxy-3l -hydroxy-4 hydroxy-prolyl-FK506, 8-deoxo-3O-desRmethoxy-3O-cis-hydroxy- 3 l-trans-hydroxy- 4 hydroxy-prolyl-FK506, B-ex-0dsmtoy3 ishdoy3-cis-hydroxy-4 hydroxy-prolyI-FK506, B-ex-0dsmtoy3 rashdoy3-trans-hydroxy-4 25 hydroxy-prolyi-FK506. 8-deoxo-30-O-desmethyI-31 -dehydroxy-4-hydroxy-proly! FK506, 8-ex-0C dsehl--yrx-rliF56 8-cL-oxo-30-des'ethoxy 3O-methiyl4-hydroxy-proIyi-FK 5

O

6 , 8-deoxo-3Q-O-desmfethyI-3 1-dehydroxy-3 1 methy-4-hydroxy-proIyi-FK 5 0 6 , 8-deoxo-30-O-desmethyI-3l -dehydroxy-31 -fluoro-4 hydroxy-prolyI-FK506, 8 -deoxo-30-desmethoxy-30-fluoro-4hydroxy-proIyi-FK 5 0 6 , 8 30 deoxo-30-O-desmethyl- 3 1I-dehydroxy-31 -chloro-4-hydr0xy-proIyi-FK50 6 , 8-deoxo-30 desmethoxy 30-chloro-3-hydroxy-4hydroxy-prolylIFK 5 0 6 , 8-deoxo-30-0-desmethyI 31 -dehydroxy-31 tert-butyI]4-hydroxy-prolyI-FK 5

O

6 , 8&deoxo-28-de(3-methoxy-4 hydroxy-cyclohexy)-28-(hydroxy-cycloheptyl)4hydroxy-prolyi-FK 5 0 6 , B-deoxo-28 de3mtoy4hdoyccoey)2-hyrx-obml--yrx-rllF56 35 31 -desmethoxy-trals-3-bicycI0( 3 .l .0.]FK506, 31 -desmethoxy-31 -cis-hydroxy-32 57 trans-hydroxy-trans-3-bicyclo[ 3 .1.0.]FK506, 31-desmethoxy-31-cis-hydroxy-32-cis hydroxy-trans-3-bicyclo[3.1.0.]FK506, 31-desmethoxy- 3 1-trans-hydroxy-32-trans hydroxy-trans-3-bicyclo[3.1.0.]FK506, 31-O-desmethyl-32-dehydroxy-trans- 3 bicyclo[3.1.0.]FK506, 31-0-desmethyl-trans-3-bicyclo[3.1.0.]FK506, 31-desmethoxy 5 31-methyl-trans-3-bicyclo[3.1.0.]FK506, 31-O-desmethyl-32-dehydroxy-32-methyl trans-3-bicyclo[3.1.0.]FK506, 31-O-desmethyl-32-dehydroxy-32-fluoro-trans-3 bicyclo[3.1.0.]FK506, 31-desmethoxy-31-fluoro-trans-3-bicyclo[3.1.0.]FK506, 31-0 desmethyl-32-dehydroxy-32-chloro-trans- 3 -bicyclo[ 3 .1.0.]FK506, 31-desmethoxy-31 chloro-trans-3-bicyclo[3.1.0.]FK506, 31-0-desmethyl-32-dehydroxy-32-tert-butyl 10 trans-3-bicyclo[3.1.0.]FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-trans-3-bicyclo[ 3 .1.0.]FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl) 29-(hydroxy-norbomyl)-trans-3-bicyclo[ 3 .1.0.]FK506, 9-deoxo-31-desmethoxy-trans 3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-31-cis-hydroxy-32-trans-hydroxy trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-31-cis-hydroxy-32-cis 15 hydroxy-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-31-trans-hydroxy-32 trans-hydroxy-trans-3-bicyclo[ 3 .1.0.]FK506, 9-deoxo-31-0-desmethyl-32-dehydroxy trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-0-desmethyl-trans-3-bicyclo[ 3 .1.0.]FK506, 9-deoxo-31-desmethoxy-31-methyl-trans-3-bicyclo[ 3 .1.0.]FK506, 9-deoxo-31-0 desmethyl-32-dehydroxy-32-methyl-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-0 20 desmethyl-32-dehydroxy-32-fluoro-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31 desmethoxy-31-fluoro-trans-3-bicyclo[ 3 .1.0.]FK506, 9-deoxo-31-0-desmethyl-32 dehydroxy-32-chloro-trans-3-bicyclo[ 3 .1.0.]FK506, 9-deoxo-31-desmethoxy-31 chloro-trans-3-bicyclo[ 3 .1.0.]FK506, 9-deoxo-31-0-desmethyl-32-dehydroxy-32-tert butyl-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl) 25 29-(hydroxy-cycloheptyl)-trans-3-bicyclo( 3 .1.O.]FK506, 9-deoxo-29-de(3-methoxy-4 hydroxy-cyclohexyl)-29-(hydroxy-norbomyl)-trans-3-bicyclo[3..0.]FK506, In a preferred embodiment, the present invention provides the following FK506 analogues: 31-desmethoxy-31-cis-hydroxy-32-trans-hydroxy-FK506, 31-desmethoxy 31-cis-hydroxy-32-cis-hydroxy-FK506, 31-desmethoxy-31-trans-hydroxy-32-trans 30 hydroxy-FK506, 31-desmethoxy-31-methyl-FK506, 31-0-desmethyl-32-dehydroxy 32-tert-butyl-FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-norbomyl) FK506, 9-deoxo-31-desmethoxy-31-cis-hydroxy-32-trans-hydroxy-FK506, 9-deoxo 31-desmethoxy-31-cis-hydroxy-32-cis-hydroxy-FK506, 9-deoxo-31-desmethoxy-31 35 trans-hydroxy-32-trans-hydroxy-FK506, 9-deoxo-31-desmethoxy-31-methyl-FK506, 58 9-deoxo-31 -O-desmethyI-32-dehydroxy-32-tert-buty-FK5O6, 9-deoxo-29-de(3 methoxy-4-hyiroxy-cyclo'exyI)-29-(hydroxy-cycheptyI)-FK 5

O

6 , 9-deoxo-29-de(3 methoxy-4-hydroxy-cycoheXYI)-29-(hydroxy-lorbomyI).FK 5

O

6 .30-desmethoxy-30 cis-hydroxy-31 -trans-hydroxy-prolyl-FK506, 30-desmethoxy-30-cis-hydroxy-3 I -cis 5 hydroxy-prolyl-FK506, 30-desmethoxy-30-trans-hyroxy-31 -trans-hydroxy-proly FK506, 30-desmethoxy-30-methyl-proly-FK506, 30-O-desmethyl-3 1 -dehydroxy-31 tert-butyl-prolyl-FK506, 28-de(3-methoxy-4-hydroxy-cycIohexyI)-28(hydroxy cycloheptyl)-FK506, 28-de(3-methoxy4hydrxy-cycIohexyI)-28-(hydroxy-lorbol) FK506, 8-deoxo-30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-prolyl-FK506, 8 10 deoxo-30-desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-prolyl-FK506, 8-deoxo-30 desmethoxy-30-trans-hydroxy-31 -trans-hydroxy-prolyl-FK506, 8-deoxo-30 desmethoxy-30-methyl-proly-FK506, 8-deoxo-30-O-desmethyl-31 -dehydroxy-31 -tert butyl-prolyl-FK5O6, 8-deoxo-28-de(3-methoxy-4-hydroxy-cycIohexyI)-28-(hydroxy cycloheptyl)-prolyl-FK506, 8-deoxo-28-de(3-mthoxy-4-hydroxy-CYCIoheXYI)-28 15 (hydroxy-norbornyl)-prolyI-FK506, 30-desmethoxy-3-hydroxy-proIyi-FK506, 30 desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-3-hydroxy-prolyl-FK506, 30 desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-3-hydroxy-prolyI-FK506, 30-desmethoxy 30-trans-hydroxy-31 .trans-hydroxy-3-hydroxy-proly-FK506, 30-O-desmethykldehydroxy-3-hydroxy-prolyI-FK506, 30-O-desmethyl-3-hydroxy-prolyl-FK506, 30 20 desmethoxy-30-methyl-3-hydroxy-prolyi-FK50 6 , 30-O-desmethyl-31 -dehydroxy-31 methyl-3-hydroxy-prolyl-FK506, 30-O-desmethyl-3 1 -dehydroxy-31 -fluoro-3-hydroxy prolyl-FK506, 3O-desmethoxy-30-fluro-3-hydroxy-proIyi-FK5O6, 30-O-desmethyl-31 dehydroxy-31 -chloro-3-hydroxy-prolyl-FK506, 30-desmethoxy-30-choro-3-hydroxy prolyl-FK506, 30-O-desmethyl-31 -dehydroxy-3 1-tert-butyl-3-hydroxy-pro~yI-FK506, 25 28d(-ehx--yrx-ylhxl-8-hdoyccoetl--yrx-ril FK506, 28d(-ehx--yrx-ylhxl-8(yrx-obry)3hdoy prolyl-FK506, 8-deoxo-30-desmethoxy-31I-hydroxy-3-hydroxy-*prolyI-FK506, 8-deoxo 30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-3-hydroxy-prolyt-FK506, 8-deoxo 3G-desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-3-hydroxy-prolyl-FK506 .8-deoxo-30 30 desmethoxy-30-trans-hydroxy-31 -trans-hydroxy-3-hydroxy-prolyl-FK506, B-deoxo-30 O-desmethyl-31 -dehydroxy-3-hydroxy-prolyl-FK506, 8-deoxo-30-O-desmethyl-3 hydroxy-prolyl-FK506, 8-deoxo-30-desmethoxy30-methy-3-hydroxy-proIyI-FK 5

O

6 , 8 deoxo-30-O-desmethyl-31 -dehydroxy-31 -methyl-3-hydroxy-prolyl-FK506, 8-deoxo 30-Q-desmethyl-31 -dehydroxy-31 -fluoro-3-hydroxy-prolyl-FK506, 8-deoxo-30 35 desmethoxy-30-fluoro-3-hydroxy-proyI-FK5O6, 8-deoxo-30-O-desmethyl-31 59 dehydroxy-31I-chloro-3-hydroxy-prolyI-FK506, 8-deoxo-3O-desmethoxy-3O-choro-3 hydroxy-3-hydroxy-prolyi-FK506, 8-deoxo-30-O-desmethyl-31 -dehydroxy-31 -tert butyl-3-hydroxy-prolyl-FK506, 8-deoxo-28-de(3-methxy-4-hydroxy-cyclohexyl)- 2 8 (hydroxy-cycloheptyl)-3-hydroxy-prolyI-FK506, 8-deoxo-28-de(3-methoxy-4-hydroxy 5 cyclohexy)-28(hydroxy-orboyl)-3-hydroxy-proIyI-FK5O6, 30-desmethoxy-4 hydroxy-prolyl-FK506, 30-desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-4-hydroxy prolyl-FK506, 30-desmethoxy-30-cis-hydroxy-31 -cis-hydroxy-4-hydroxy-proly-FK5O6, 30-desmethoxy-30-trans-hydroxy-31 -trans-hydroxy-4-hydroxy-proIyi-FK506, 30-0 desmethyl-31 -dehydroxy-4-hydroxy-proIyI-FK5O6, 3O-0-desmethy-4-hydroxy-proIyI 10 FK506, 30-desmethoxy-30-methyl-4-hydroxy-prolyI-FK50 6 , 30-0-desmethyl-31 dehydroxy-31 -methyl-4-hydroxy-prolyl-FK5OB, 30-0-desmethyl-31 -dehydroxy-31 fluoro-4-hydroxy-prolyl-FK506, 3O-desmethoxy3fluor-4-hydroxy-proIYI-FK 5 OG, 30 0-desmethyl-31 -dehydroxy-31 -chloro-4-hydroxy-prolyI-FK506, .30-desmethoxy-30 chloro-4-hydroxy-prolyl-FK506, 3D-0-desmethyl-31 -dehydroxy-31 -tert-butyl-4 15 hydroxy-prolyl-FK506, 28-de(3-methoxy--hydroxy-cycIohexyI)-28-(hydroxy cycloheptyo-4-hydroxy-proyi-FK5O6, 28-de(3-methoxy-4-hydroxy-cycIohexyI)-28 (hydroxy-norborny)-4-hydroxy-proIyl-FK5O6, 8-deoxo-30-desmethoxy-31 -hydroxy-4 hydroxy-prolyl-FK506, 5-deoxo-3O-desmethoxy-30-cis-hydroxy-3l -trans-hydroxy-4 hydroxy-prolyl-FK506, 8-deoxo-30-desmethoxy-3-ci-hydroxy- 3 l-cis-hydroxy-4 20 hydroxy-prolyl-FK506, 8-deoxo-30-desmethoxy-30-trfls-hydroxy- 3 l-trans-hydroxy-4 hydroxy-prolyl-FK506, 8-deoxo-30-0-desmethyl-31 -dehydroxy-4-hydroxy-proIyi FK506, 8-deoxo-3O00desmethy-4-hydroxy-proIyI-FK5O6, 8-deoxo-30-desmethoxy 30-methyl-4-hydroxy-prolyl-FK506,. B-deoxo-30-0-desmethyl-3 I -dehydroxy-31 methyl-4-hydroxy-proyi-FK506, 8-deoxo-30-O-desmethyl-3 1-dehydroxy-3 1-fluoro-4 25 'hydroxy-prolyl-FK506, B-ex-Ddsehx-0fur--yrx-rllF56 8 deoxo-30-0-desmethyl-31 -dehydroxy-31 -chloro-4-hydroxy-prolyI-FK506, 8-deoxo-30 desmetoxy3-choro-3-hydroxyA-hydroxy-proIyiFK 5 0 6 , 8-deoxo-30-O-desmethyl 31 -dehyciroxy-31 -tert-butyl-4-hydroxy-prolyI-FK506, 8-deoxo-28-de(3-methoxy-4 hydroxy-cyclohexy)-28(hydroxy-cycIoheptyI)-4-hydroxy-proIyiFK 5 0 6 , 8-deoxo-28 30 de3mtoy4hdoyccoey)2-hdoynroy)-yrx-rliF56 3 1 .desmethoxy-tras-3-bicycIo[3. 1 .O.]FK506, 31 -desmethoxy-3 1 -cis-hydroxy-32 trans-hydroxy-trans-3-bicycIo[3.1I.O.]FK506, 31 -desmethoxy-3 I-cis-hydroxy-32-cis hydroxy-trns-3-bicycIo[3.1I.0.]FK506, 31 -desmethoxy-31I-trans-hydroxy-32-tanls hydroxy-trans-3-bicycIo[3.1I.0.]FK506, 31-0-desmethyl-32-dehydroxy-trafls-3 35 bicyclo[3.1I.O.]FK506, 31 -0-desmethyl-trans-3-bicycIo[3.1I.O.]FK506, 31 -desmethoxy 60 31-methyl-trans-3-bicyclo[3.1.0.]FK506, 31-0-desmethyl-32-dehydroxy-32-methyl trans-3-bicyclo[3.1.0.]FK506, 31-0-desmethyl-32-dehydroxy-32-fluoro-trans-3 bicyclo[3.1.0.]FK506, 31-desmethoxy-31-fluoro-trans-3-bicyclo[3.1.0.]FK506, 31-0 desmethyl-32-dehydroxy-32-chloro-trans-3-bicyclo[3.1.0.]FK506, 31-desmethoxy-31 5 chloro-trans-3-bicyclo[3.1.0.]FK506, 31-0-desmethyl-32-dehydroxy-32-tert-butyl trans-3-bicyclo[3.1.0.]FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-trans-3-bicyclo[3.1.0.]FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl) 29-(hydroxy-norbomyl)-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-trans 3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-31-cis-hydroxy-32-trans-hydroxy 10 trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-31-cis-hydroxy-32-cis hydroxy-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-31-trans-hydroxy-32 trans-hydroxy-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-0-desmethyl-32-dehydroxy trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-(-desmethyl-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31 -desmethoxy-31 -methyl-trans-3-bicyclo[3. 1.0.]FK506, 9-deoxo-31 -0 15 desmethyl-32-dehydroxy-32-methyl-tans-3-bicyclo[3. 1. 0.]FK506, 9-deoxo-31 -0 desmethyl-32-dehydroxy-32-fluoro-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31 desmethoxy-31-fluoro-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-0-desmethyl-32 dehydroxy-32-chloro-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-desmethoxy-31 chloro-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-31-0-desmethyl-32-dehydroxy-32-tert 20 butyl-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl) 29-(hydroxy-cycloheptyl)-trans-3-bicyclo[3.1.0.]FK506, 9-deoxo-29-de(3-methoxy-4 hydroxy-cyclohexyl)-29-(hydroxy-norboyl)-trans-3-bicyclo[3.1.0.]FK506. In a more highly preferred embodiment, the present invention provides the following FK506 analogues: 31-desmethoxy-31-methyl-FK506, 31-0-desmethyl-32 25 dehydroxy-32-tert-butyl-FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-norbornyl) FK506, ~9deoxo-31-desmethoxy-31-methyl-FK506, 9-deoxo-31-0-desmethyl-32 dehydroxy-32-tert-butyl-FK506, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29 (hydroxy-cycloheptyl)-FK506, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29 30 (hydroxy-norbornyl)-FK506, 30-desmethoxy-30-methyl-prolyl-FK506, 30-0 desmethyl-31-dehydroxy-31-teit-butyl-prolyl-FK506, 28-de(3-methoxy-4-hydroxy cyclohexyl)-28-(hydroxy-cycloheptyl)-FK506, 28-de(3-methoxy-4-hydroxy cyclohexyl)-28-(hydroxy-norbomyl)-FK506, 8-deoxo-30-desmethoxy-30-methyl prolyl-FK506, 8-deoxo-30-0-desmethyl-31-dehydroxy-31-tert-butyl-prolyl-FK506, 8 35 deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-prolyl 61 *FK506, 8-ex-8d(-ehx--yrx-ccoey)2-hdoynroy) prolyl-FK506, 3O-desmethoxy-3-hydroxy-proIyI-FK506, 30-desmethoxy-30-cis hydroxy-31I-trans-hydroxy-3-hydroxy-proyI-FK506, 30-desmethoxy-30-cis-hydroxy 31 -cis-hydroxy-3-hydroxy-prolyI-FK506, 3O-desmethoxy-3-trans-hydroxy-31 -trans 5 hydroxy-3-hydroxy-proIyI-FK506, 30-O-desmethyl-31 -dehydroxy-3-hydroxy-proIyI FK506, 3O-O-desmethy-3-hydroxy-prolyl-FK5O6, 30-desmethoxy-30-methyl-3 hydroxy-proyI-FK506, 30-O-desmethyl-3 1-dehydroxy-31 -methyl-3-hydroxy-prolyi FK506, 30-Q-desmethyl-31 -dehydroxy-31 -fluoro-3-hydroxy-prolyI-FK506, 30 desmethoxy3-fluoro-3-hydroxy-proIyI-FK 5

O

6 , 30-O-desmethyl-31 -dehydroxy-31 10 chloro-3-hydroxy-prolyI-FK506, 3O-desmethoxy-3O-choro-3-hydroXy-proIyl-FK 5

O

6 , 3D0O-desmethyl-31 -dehydroxy-31 -tert-butyI-3-hydroxy-proIyl-FK5O6, 28-de(3 8-deoxo-3O-desmethoxy-3l -hydroxy-3-hydroxy-proIyI-FK506, 8-deoxo-30 15 desmethoxy-30-cis-hydroxy-31 -trans-hydroxy-3-hydroxy-proIyl-FK5O 6 , 8-deoxo-30 desmethoxy-30-CIS-hydroxy-3l -cis-hydroxy-3-hydroxy-proIyI-FK5O6, 8-deoxo-30 desmethoxy-30-trals-hydroxy- 3 l -trans-hydroxy-3-hydroxy-prolyI-FK50 6 , 8-deoxo-30 O-desmethyl-31 -dehydroxy-3hydroxy-proIyI-FK5O6, 8-deoxD-30-O-desmethyl-3 hydroxy-prolyi-FK506, 8-ex-0dsehx-0mty--yrx-rllF56 8 20 deoxo-30-O-desmethyl-3 1-dehydroxy-31 -methyi-3-hydroxy-prolyi-FK50 6 , 8-deoxo 30-O-desmethyl-31 -dehydroxy-31 -fluoro-3-hydroxy-proIyI-FK506, 8-deoxo-30 desethoxy3fuoro-3-hydroxy-protyI-FK 5

O

6 , B-deoxo-30-O-desmethyl-31 dehydroxy-3 1 chloro-3-hydroxy-prolyi-FK5O6, 8-deaxo-30-desmethoxy-3O-chIoro- 3 hydroxy-3-hydroxy-proIyi-FK506, 8-deoxo-30-O-desmethyl-31 -dehydroxy-31 -tert 25 butyl-3-hydroxy-proly-FK50 6 , B-ex-8d(-ehx--yrx-ylhxl-8 (hydroxy-cyclohepty)3-hydroxy-prolyI-FK 5

O

6 , 8-deoxo-28-dep3-methoxy-hydroxy cylh~l-8(yrx-obml--yrx-rllF56 30-desmethoxy-4 hydroxy-prolyl-FK506, 3O-desmethoxy-3-cis-hydroxy-31 -trans-hydroxy-4-hydroxy prolyl-FK506, 3O-desmethoxy-30-cis-hydroxy-3l -cis-hydroxy4-hydroxy-proIyi-FK5O 6 , 30 3O-desmethoxy-3-trafls-hydroxy- 3 l -trans-hydroxy-4-hydroxy-proIyl-FK5O&. 30-0 desmethyl-31 -dehydroxy4-hydroxy-proIyI-FK 5

O

6 , 30-0-desmethyl4-hydroxy-proIyI FK506, 30-desmethoxy-30-methyA-hydroxy-prolyIFK 5

O

6 , 30-O-desmethyl-31 dehydroxy-31 -methyI-4-hydroxy-prolyI-FK5O 6 , 30-0-desmethyl-31I-dehydroxy-!31 fluoro-4-hydroxy-protyI-FK5 06 , 30-desmethoxy-30-fuor-4-hydroXY-proIyI-FK 5

O

6 , 30 35 O-desmethyl-31 -dehydroxy-31 -chloro-4-hydroxy-prolyi-FK506, 30-desmethoxy-30chloro-4-hydroxy-prolyt-FK506, 30-O-desmethyl-31 -dehydroxy-31-tert-buty hydroxy-prolyl-FK506, 28-de(3-methoxy-4-hyiroxy-cycloexy)-28-(hydroxy cycloheptyl)4-hydroxy-prolyl-FK506, 28-de(3-methoxy-4-4iydroxy-cycohexyl)-28 (hydroxy-norbomyl)-4-hydroxy-proly-FK506, 8-deoxo-30-desmethoxy-31 -hydroxy-4 5 hydroxy-prolyl-FK506, 8-deoxo-3desmethoxy-3-cis-hydroxy-31 -trans-hydroxy-4 hydroxy-protyl-FK506, 8-deoxo-30-desmethoxy-30-cis-hydroxy-3 1-cis-hydroxy-4 hydroxy-prolyl-FK506, 8-deoxo-3-desmethoxy-3-trans-tiyroxy-31 -trans-hydroxy-4 hydroxy-prolyl-FK506, 8-deoxo-30-O-desmethyl-31I-dehydroxy-4-hydroxy-prolyl FK506, 8-deoxo-30-O-ciesmethyl-4-hydroxy-prolylFK506, 8-deoxo-30-desmethoxy 10 3O-methyM--hydroxy-prolyI-FK5O6, 8-deoxo-30-O-desmethyl-3 1-dehydroxy-3 1 methyl-4-hydroxy-prolyl-FK506, 8-deoxo-30-O-desmethyl-31 -dehydroxy-31 -fluoro-4 hydroxy-:prolyl-FK506, 8-deoxo-30-desmethoxy-30-fluoro-4-hydroxy-proly.FK5oG, 8 deoxo-30-O-desniethyl-31I-dehydroxy-31-chloro-4-hydroxy-proly-FK506, 8-deoxo-30 desmethoxy-30-chloro-3-hydroxy-4-hydroxy-prolyl-FK506, 8-deoxo-30-O-desmethyl 15 31 -dehydroxy-31 -tert-butyl-4-hydroxy-proly-FK506, B-deoxo-28-de(3-methoxy-4 hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)4-hydroxy-prolyl-FK506, 8-deoxo-28 de(3-methoxy-4-hydroxy-cycohexy)-28-(hydroxy-norbomy)-4-hydroxy-prolyi-FK506, 31 -desmethoxy-trans-3-bicyclo[3.1I.O.JFK506, 31-desmethoxy-31 -cis-hydroxy-32 trans-h ydroxy-trans-3-bicyclo[3. 1 ;O.]FK506, 31 -desmethoxy-3 1-cis-hydroxy-32-cis 20 hydroxy-trans-3-bicyclo[3. 1 .. ]FK506, 31 -desmethoxy-31 -trans-hydroxy-32-trans hydroxy-trans-3-bicyclo[3.1I.O.]FK506, 31 -O-desmethyl-32-dehydroxy-trans-3 bicyolo[3.1I.O.JFK506, 31-O-desmethyl-trans-3-bicyclo[3.1I.O.]FK506, 31 -desmethoxy 31 -methyl-trans-3-bicyclo[3. I.O.JFK506, 31 -O-desmethyl-32-dehydroxy-32-methyl trans-3-bicyclo[3.1I.O.JFK506, 3 1-O-desmethyl-32-dehydroxy-32-fluoro-trans-3 25 bicyclo[3. 1. O.]FK506, 31-desmethoxy-31 -fluoro-trans-3-bioyclo[3. 1 .. ]FK506, 31-0 desmethy-32-dehydroxy-32-chloro-rans-3-bicyclo[3.1I.O.]FK506, 31 -desmethoxy-3 1 chloro-frans-3-bicyclo[3.1I.O.JFK506, 31 -Q-desmethyl-32-dehydroxy-32-tert-butyl trans-;3-bicycto[3. 1 .. ]FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl}4rans-3-bicyclo[3.l1.O.]FK506, 29-de(3-rnethoixy-4-hycfroxy-cyclohexyl) 30 29-(hydroxy-norbarny)-trans-3-bicyclo[3. 1 .. ]FK506, 9-deoxo-31I-desmethoxy-tmans 3-bicyclo[3. 1 .. ]FK506, 9-deoxo-31 -desmethoxy-31 -cis-hydroxy-32-trans-hydroxy trans-3-bicyclo3. 1 .O.]FK506, 9-deoxo-31I-desmethoxy-31 -cis-hydroxy-32-cis hydroxy-trans-3-bicyclo[3. 1 .. ]FK506, 9-deoxo-3 1-desmethoxy-31 -trans-hydroxy-32 trans-hydroxy-trans-3-bicyclo(3. I .O.]FK506, 9-deoxo-3 I -O-desmethyl-32-dehydroxy 35 trans-3-bicyclo[3.1I.O]FK506, 9-deoxo-31I-O-desmethyl-t'ans-3-bicyc o[3. I.O.]FK506, 63 9-deoxo-31 -desmethoxy-31 -methyl-trans-3-bicyclo[ 3 .I .O]FK506, 9-deoxo-31 -0 demty-2dhdoy3-mty-rn--iyl[.O.]FK506, 9-deoxo-3 1-0 desmethy-32-dehydroxy-32-fluoro-tals-3bicyclo[ 3 .l .O.FK506, 9-deoxo-31 desmethoxy31-fluoro-trals- 3 -bicyclo[ 3 .1I.O.]FK506, 9-deoxo-31 -0-desmethyl-32 5 dehydroxy-32-chloro-trfls-3-bicycI0[ 3 .1 .O.FK506, 9-deoxo-31 -desmethoxy-31 chloro-trans-3-bicyclo[3.1I.O.]FK506, 9-deoxo-31 -0-desmethyl-32-dehydroxy-32-tort butyl-trans-3-bicyclo[3. I.O.]FK506, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexYl) 29-(hydroxy-cycloheptyl)-trafls-3-bicycI0[ 3 .1I.O.]FK506, 9-deoxo-29-de(3-methoxy-4 hyrx-ylhxl-9(yrx-obml-ras3bcco3 1.O.]FK506. 10 In further aspects the Invention provides: A: Compounds of the formula: R7

R

1 5

-

O 0 OH 15 where: x =bond or CHR 1 , or -CHRG-x-CHR5- is 20 R15 64

R

17 RR17 -R16 , R16 R16 A B C ,D 17 -RC ' -17 R D E F G R1= OH, OCH 3 R2 = H, OH, OCH 3 R3 = H, OH, CH 3 , F, Cl, OCH 3 5 R4 = H, OH, CH, F, CI R5 = H, OH R6 = H, OH R7 = H R8 = H, keto. 10 R9 = H, keto R10 = H R11 = H R13=H R14 = H 15 R16 = OH, OCH 3 R17 = H, OH, Cl, F and y = bond, CH 2 with the- proviso that the compounds do not include the following:: 20 i) where R, = OCH 3 in combination with R 2 = H, R 15 = C, R 1 B cis-3-OH, R17 = trans-4-OH, Rs= H, Re= H, R 7 = H, Re= H, R 9 = H, R 10 = H, R, = H, x =

CHR

1 ; ii) where R 1 = OH in combination with R 2

OCH

3 , R 1 5 = C, R18 = cis-3-OH,

R

1 7 = trans-4-OH,

R

5 = H, R= H, R 7 = H, Re,R, = keto, R 1 a= H R, = H, x = 25

CHR

1 ; iii) where R 1 = OH in combination with R 2 = OH, R 1 , 5 = C, R1 6= cis-3-OCH 3 ,

R

1 7 = trans-4-OH, Rs= H, Re= H, R 7 = H, Re,R 9 =keto, R 1 = H, R, 1 = H, x = CHRil; 65 iv) where R 1 = OH in combination with R 2 = H, R 1 s = C, R 16 = cis-3-OCH 3 , R 17 =trans-4-OH, Rs = H, Re= H, R 7 = H, R6,R, = keto, R 1 = H, RI, = H, x

CHR

1 ; v) where R 1 = OCH 3 in combination with R 2 = H, R 1 s = C, R 18 = cis-3-OH,

R

17 5 = trans-4-OH,

R

5 = H, R= H, R 7 = H, Re,R 9 = keto, R 1 o= H, Rv, = H, x =

CHR

1 ; vi) where R 1 = OCH 3 in combination with R 2 = H, R 1 s = C, R 1 e = cis-3-OCH3 ,

R

17 trans-4-OH, Rs = H, R6 = H, R 7 = H, Re = H, Re = H, R 1 o= H, RI, H, x = CHR 1 ; 10 vii) except where R 1 = OCH 3 in combination with R 2 = OH, R 1 s = C, R 1 = cis 3-OCH 3 , R 17 = trans-4-OH, Rs = H, Re = H, R 7 = H, Re = H, R 9 H, R 10 H, Rji = H, x = CHR 1 ,; viii) where

R

1 = OCH 3 in combination with R 2

=OCH

3 , R 1 s = C, R 1 cis-3

OCH

3 , R 17 = trans-4-OH,

R

5 = H, R6 = H, R 7 = H, Re = H, R 9 = H, R 1 = H, 15

R

1 = H, x =CHRoj; ix) where R 1 = OH In combination with R 2 = OCH 3 , R 1 s = C, R 16 = cis-3-OCH3,

R

17 = trans-4-OH, Rs = H, R 6 = H, R 7 = H, R 8 ,Rq = keto, R 1 o = H, RI, = H, x = CHRI 1 ; x) where

R

1 = OCH 3 in combination with R 2 = OH, R 1 s = C; R 1 8 = cis-3-OCH3, 20

R

17 = trans-4-OH, Rs = H, Re = H, R 7 = H, R 8 ,Rg = keto, R 1 o = H, RI, = H, x = CHRII; xi) where R 1 = OCH 3 in combination with R 2 = H, R 16 = C, R 18 = cis-3-OCH3 ,

R

17 trans-4-OH,

R

5 = H, Re = H, R 7 = H, R 8 ,Rq = keto, R 10 = H, Ril = H, x = CHR 1 ; 25 xii) where R 1 = OCH 3 in combination with R 2 = OCH 3 , R 1 s = C, R 1 6 = cis-3-OH,

R

1 7 trans-4-OH,

R

5 = H, Re = H, R 7 = H, Rs,Rq = keto, R 10 = H, R, 1 = H, x =CHRII; xiii) where R 1 = OCH 3 in combination with R 2 = H, R 15 = C, R 1 e = cis-3-OCH3 ,

R

17 = trans-4-OH,

R

5 = H, Re = H, R? = H, Re = H, Re = H, R 1 O = H, x = 30 bond; xiv) where R 1 = OCH 3 in combination with R 2 = OCH 3 , R 1 s = C, R 1 6 = cis-3

OCH

3 , R 17 trans-4-OH,

R

5 = H, Re = H, R 7 = H, Re = H, R 9 = H, R 1 = H, x = bond; xv) where R 1 = OCH 3 In combination with R 2 = OH, R 1 s = C, R 1 8 = cis-3-OCH3 , 35

R

17 trans-4-OH,

R

5 = H, Re = H, R, = H, R 8 ,Rq = keto, R 10 = H, x = bond; 66 xvi) where R 1 = OCH 3 in combination with R 2 = H, R 1 5 = C, R 18 = cis-3-OCH 3 ,

R

17 = trans-4-OH, Re = H, Re = H, R 7 = H, Re,R 9 = keto, R 1 o = H, x = bond; xvii) where R 1 = OCH 3 in combination with R 2 = OCH 3 , R 1 s = C, Rie = H, R 1 7 = OH, R 5 = H, Re = H, R 7 = H, R 8

,R

9 = keto, R 1 = H, R 1 1 = H, x = CHR 1 ,; R 1 5 xviii) where -CHRe-x-CHRs- is and R 11 = H, R 13 = H, R 14 = H, in combination with R 1 = OCH 3 , R 2 = OCH 3 , R 1 s = C, R1 6 = cis-3-OCH 3 , R 1 7 = trans-4-OH, R 7 = H, Re, Re = keto, R 10 = H; xix) where R 16 = G, R 1 = cis-3-OCH 3 , R 17 = trans-4-OH, y = bond, in combination with R 1 = OCH 3 , R 2 = H, R 5 = H, Re = OH, R 7 = H, R 11 = H, x 10 = bond, RB,Rq = keto, R 10 = H xx) where R 1 8 = G, R 3 = H, R 4 = trans-OH, y = bond, in combination with R, =

OCH

3 , R 2

OCH

3 , R 5 = H, R = H, R 7 = H, R, 1 = H, x = CHR 1 , Ro,R 9 = keto, R 10 = H. xxi) where R 1 s = G, R 3 = H, R 4 = OH, y = CH 2 in combination with R 1 = OCH 3 , 15

R

2 = OCH 3 ; R 5 = H, Re = H, R 7 = H, Rl = H, x = CHR 1 , R,Re = keto, R 10 = H xxii) where R 16 = G, R 3 = cis-OH, R 4 = H, y = bond, in combination with R 1 =

OCH

3 , R 2 = OCH 3 , R 5 = H, Re = H, R 7 = H, R 1 1 = H, x = CHR 11 , Rs,R 9 keto, R 1 = H 20 xxiii) where R 15 = G, R 3 = CH, R4 = OH, y = bond, in combination with R 1 =

OCH

3 , R 2 = OCH 3 , R 5 = H, Re = H, R 7 H, R 1 1 = H, x = CHRI 1 , R,R, = keto, R 10 = H xxiv) where R 1 , = G, R 3 = H, R 4 = OH, y = CH 2 , in combination with R 1 = OH, R 2 = OH, R 5 = H, Re = H, R 7 = H, Rl = H, x = CHR, 1 , RB=R 9 = H, R 10 = H 25 xxv) where R 1 5 = G, R 3 = H, R 4 = OH, y = CH 2 , in combination with R 1 = OCH 3 , R2 = OCH 3 , Rs = H, Re = H, R 7 = H, R 1 1 = H, x = CHR 1 , RB=R = H, R 10 = H xxvi) where R 15 = G, R 3 = H, R 4 = OH, y = CH 2 , in combination with R 1 = OH, R 2 = OCH3, Rs = H, Re = H, R 7 = H, Ril = H, x = CHR 1 , R 8 =Rq = H, R 1 = H 30 xxvii) where R 1 5 = G, R 3 = H, R 4 = OH, y = CH 2 , in combination with R 1 = OH, R 2 = H, Re = H, R = H, R 7 = H, R 11 = H, x = CHRI 1 , R 8

=R

9 = H, R 10 = H; xxviii) where R 15 = G, R 3 = H, R 4 = OH, y = CH 2 , in combination with R 1 = OH, R 2 = OCH 3 , Rs = H, R 6 = H, R 7 = H, R, 1 = H, x = CHR, 1 , R, Re = keto, R 10 = H 67 xxix) where R 1 5 = G, R 3 = H, R 4 = OH, y = CH 2 , in combination with R 1 = OCH 3 , R2= H, Rs = H, Re = H, R 7 = H, R 11 H, x = CHR 11 , R 8 ,R, keto, RI = H 5 B. Compounds according to the formula below R RR6

R

6 Ry O OH R9 O , 0 6 0 R2 O01 where

R

1 =OH, OCH 3 10 R 2 = H, OH, OCH 3

R

3 = H, OH, CH 3 , OCH 3

R

4 = H, OH Rr = H R6= H, OH 15 R 7 = H Ri = H, keto

R

9 = H, keto Rio= H. x = bond, CH 2 or-CHRe-x-CHR- is R 1 20 R,= H

R

1 3 = H R14= H y = bond, CH 2 25 with the proviso that the compounds do not include the following: 68 I) where R 3 = H, R 4 = trans-OH, y = bond, in combination with Ri

OCH

3 , R 2 = OCH 3 , Re = H, Re = H, R 7 = H, x = CH 2 , R 8 1

R

9 keto, RIO -H ii) where R 3 = H, R 4 = OH, y = OH 2 in combination with R, = 00H 3 , R 2 = 5

OCH

3 , R 5 = H, Re = H, R 7 = H, x = CH 2 ,cRe,Rg = keto, Rio = H iii) where R 3 = cls-OH, R 4 = H, y = bond, in combination with R, = OCH 3 , R= OCH 3 , R5 = H, Re = H, R 7 = H, x =CH 2 , R 8

,R

9 = keto, RIO = H iv) where R 3 = OH 3 , R 4 = OH, y = bond, in combination with R, = OCH 3 , R= 00H 3 , Rs z- H, R 6 = H, R 7 = H, x = OH 2 , Ra,R 9 = keto, Rio = H 10 V) where R 3 = H, R 4 = OH, y = OH 2 , in combination with R, = OH, R 2 OH, Rs = H, Re = H, R 7 = H, x = OH 2 , R 8

=R

9 = H, Rio = H vi) where R 3 = H, R 4 = OH, y = OH 2 , in combination with R 1 = OCH 3 , R 2 =

OCH

3 , Rs = H, R 6 = H, R 7 = H, x = OH 2 , R.=R 9 = H, Rio H vii) where R 3 = H, R 4 = OH, y = OH 2 , in combination with R, OH, R 2 15

OCH

3 , R 5 =H.ReH,R 7 = H, x=CH 2 , R=R9=H, RIO H viii) where R 3 = H, R 4 = OH, y OH 2 , in combination with R, OH, R 2 = H,

R

5 = H, Re = H, R 7 = H, x = H 2 , Ra=Rg = H, Rio = H; ix) where R 3 = H, R 4 = OH, y = H 2 , in combination with R, OH, R 2 00H 3 , R = H, Re =H,R 7 = H,x = H 2 , Ro,R = keto, Ro = H 20 X) where R 3 = H, R 4 = OH, y = OH 2 , in combination with'R 1 = OCH 3 , R 2 = H, Rs = H, R 8 e H, R 7 = H, x = OH 2

,NR,R

9 = keto, Rio = H xi) where R 3 = 00H 3 , R 4 = OH, y = bond, in combination with R, OCH 3 ,

R

2 = H, R 5 = H, Re = OH, R 7 = H, x= bond, R 8

,R

9 = keto, Rio H x ii) where -. CH&-x-CHRs- i and RI, = H, R 13 = H, R 14 = H, in 25 combination with R, = OCH 3 , R 2 = 00H 3 , R 3 = 00H 3 , R. = OH, R 7 = H, Re,R 9 = keto, Rio = H xiii) where R, = 00H 3 in combination with R 2 = H, R 3 = 00H 3 , R 4 = OH, R 5 = H, Re H, R 7 = H, R = H, Rg=H, R 1 = H, x =bond, y= bond xiv) where Ri = 00H 3 in combination with R 2 = 00H 3 , R 3 = 00H 3 , R 4 30 OH, R 5 =H, R =H,R 7 =H, Re =H, Re=H, Rio =H, x =bond, y bond xv) where R, = 00H 3 in combination with R 2 = OH, R 3 = 00H 3 , R 4 =OH, Rs= H, Re H, R 7 = H, Rs,R 9 = keto, Rio = H, x = bond, y = bond 69 xvi) where R, OCH 3 in combination with R 2 = H, R 3 = OCH 3 , R 4 = OH, Rs = H, NR= H, R 7 = H, R6,R 9 = keto, R 1 0 = H, x =bond, y = bond xvii) where R=OCH 3

,R

2 =H, R 3 =OH, R=OH, R=H, R=H xviii) where R =OCH, R 2 H, R=OCH 3 , R=OH, RH, R=H 5 xAx) where R, OCH 3 , R 2 = H, R 3 = OH, R4 = OH, R 8

,R

9 keto xx) where R, = OH, R 2 = OH, R 3 = OCH 3 , R 4 = OH, Re,R 9 = keto xxi) where R, = OCH 3 , R 2 = OCH 3 , R3 = OH, R 4 =OH, R 8

,R

9 keto xxii) where R, = OCH 3 , R 2 = OH, R 3 = OCH 3 , R 4 =OH, R 8 ,R, keto xxiii) where R, = OCH 3 , R 2 = OCH 3 , R 3 = OCH 3 , R 4 = OH, Re H, R 9 = H 10 C. A compound selected from the group consisting of: 9-deoxo-l 6-0 desmethy-27-desmethoxy-39--desmlethyI-rapamycin (pre-rapamycin), 9-deoxo-1 6 0-emty-70dsehl-90dsehlrpmcn 1 6-O-desmethyl-27 desmethoxy-39-O-desmethyl-rapaycin, 9-deoxo-1 6-0-desmethyl-39-O-desmethyl 15 rapamycin, 9-deoxo-16-O-desmethyl-27-desmeth)Cy-rapamycifl, 16-0-desmethyl 27-O-desmethyl-39-O-desmethyl-rapamycifl , 9-deoxo-27-O-desmethyl-39-O desmethyl-rapamycin , 9-deoxo-1 6-0-desmethyl-27-O-desmethy-rapamycin ,27-0 desmethyl-39-0-desmethyl-rapamycifl, 9-deoxo-1 6-0-desmethyl-rapamycin ,9 deoxo-39-Q-desmethyl-rapamyclfl , 8-deoxo-1 5-0-desmethyl-26-desmethoxy-38-O 20 desmethyl-prolylrapamycin (pre-prolyirapamycin), 8-deoxo-1 5-0-desmethyl-26-0 desmethy-38-0-desmethyl-prolylrapamycin, I 5-0-desmethyl-26-desmethoxy-38-0 desmethyl-prolyrapamycin, 8-deoxo-26-desmethoxy-38-0-desmethyl prolyirapamycin , 8-deoxo-1 5-O-desmethyl-38-O-desmethyI-protylrapamycin , 8 deoxo-1 5-O-desmethy-26-desmethoxy-proIylrapamycin, I 5-0-desmethyl-26-O 25 desmethyl-38-O-desmethy-prolyrapamycifl , B-deoxo-26-0-desmethyl-38-0 desmeth.yi-prolylrapamycifl, 8-deoxo-1 5-0-desmethyl-26-0-desmethyl prolylrapamycin, I 5-0-desmethy-38-0-desmethyl-proIylrapamycifl, 15-0 desmethyl-26--desmethyI-proIy~rapamycin, I 5-0-desmethyl-26-desmethoxy prolyirapamycin , 26-desmethoxy-38-0-desmethy-prolylraPamycin , 26-0-desmethyl 30 38-0-desmethyl-proylrapamycifl, 8-deoxo-1 5-O-desmethyl-prolylrapamycifl, 8 deoxo-26-0-desmethy-proylraPamycifl, 8Meoxo-38-0-desmethyI-prolylrapamycin, I 5-0-desmethy-prolylrapamycin , 38-0-desmethyl-prolylrapamycin , 9-deoxo-1 6-0 desmethy-27-desmethoxy-39-desmetho(y-rapamycin , 9-deoxo-I 6-0-desmethyl-27 O-desmethy-39-desmethoxy-rapamycifl, I 6-O-desmethy-27-desmethoxy-39 3:5 desmethoxy-rapamyCinR 9-deoxo-27-desmethoxy-39-desmethoxy-rapamycifl , 9 70 deoxo-1 6-O-desmethyl-39-desmethoxy-rapamycin, I6-O-desmethyl-27-O desmethyl-39-desmethoxy-rapamycil , 9-ex-70dsehl3-emtoy rapamycin, I 6-O-desmethyI-39-des'ethoxy-rapamycifl , 27-desmethoxy- 39 desmethoxy-rapamycin , 27-O-desmethy 39-desmethoxy-rapamycifl, 9-deoxo-39 5 desmethoxy-rapamycin , 8-deoxo-1 5-0-desmethy-26-desmethoxy-38-desmlethoxy prolyirapamycin, 8-deoxo-I5-O-desmethy-26-O-desmlethyI-38-desmethoxy prolylrapamycin, 15--emty 6dsmtoy3Asehxypoyrpmcn 8-ex-6dsehx-8demtoypoyrpmcn 8-deoxo-1 5-0-desniethyl 38-desmethoxy-prolylrapamycif, 150dsehl2--esehl3-emtoy 1 0 prolylrapamycin, B-ex-60dsehl3-esehx-rllaayi 15-0 desmethy38desmlethoxy-proIlrapamycifl , 26-desmethcxy-38-desmfethoxy prolyirapamycin , 26-0-desmethy-38desmlethoxy-proIylrapamycifl, 8-deoxo-38 desmethoxy-prolylrapamfycifl, 38-desmthoxy-prolyrapamycifl, 9-deoxo-1 6-0-. demty-7dsehx-6d(-i-ehx4tashdoyylhxl-6 15 (hydroxycyclohexelYl) rapamycin, 9-deoxo-I 6-0-desmethy-27-desmethoxy-36-de( 3 cis-methoxy-4transhydroxycycIohexyIY-36-(dihydro(y cyclohexyl) rapamycin, 9 deoxo-16--emty 7dsehx-3-e3csmtoy4tas hydroxycyclohexyl)-36-(hydroxyforborl) rapamycin, 9-deoxo-1 6-O-desmethyl-27 -desmethoxy-36-de(3-cis-mfethoxy4-trls-hydroxycyclohexyl)3 6-

(

3 -methyIA4 20 hydroxycyclohexyl) rapamycin, 9-deoxo-1 6-O-desmethyl-27-desmeth0xy-36-de( 3 cis-methoxyAtranshydroxycycIohexy)-36+4-methyI hydroxycyclohexyl) rapamycin, 9-deoxo-l 6--emty-7dsehx-6d(-i-ehX4tas hydroxycycohexy)-36(3fluoro4hydroxycyclohexyl) rapamycin, 9-deoxo-1 6-0 desmethy-27-desmethoxy-36-de(3cismethoxy4transhydroxycyclohexy)- 36-

(

3 25 hydroxy-4-fluorocyclohexyI) rapamycin, 9-deoxo-1 6-Q-desmethyt-27-desmethoxy- 36 rapamycein, 9-deoxo-16--emty 7dsehx-3-e3csmtoy4tas h ydrxycycohexy)36(3hydroxy-4-chorocyclohexyI) rapamycin, 9-deoxo-1 6-0 30 cis-4-cis-dihydroxycycIohexyI) rapamycin, 9-deoxo-1 6-0-desmethy-27-desmlethoxy dihydroxycyclohexyt) rapamycifi, 9-deoxo-1 6-O-desmethyI-27-O-desmethyli 3 9-O desmethyl rapamycin, 9-ex-60dsehl20dsehl3-e3cs methoxy4-transhydroxycyclohe(y)36-(hydroxycyclohexenyl) rapamycin, 9-deoxo 35 16--emty2--emty-6d(-ismtoy-rn-yrxccoey) 36-(hydroxynorbomyl) rapa mycin, 9-deoxo-1 6-O-desmethyI-27-O-des methyl-36 de3csmtoy4tashdrxccoey)3-4mty hydroxycyclohexyl) rapamycin. In a specific embodiment the present invention describes methods to produce 5and optionally. isolate the following compounds (Figure 10, Figure 11, Figure 12, Figure 13, and Figures 14, 15, 16 and Figure 17): Table 11 Compound no: Name: 1. 9-deoxo-16--emty 7dsehxy3--emty-aayi (pre; rapamycin) 2. 9§'-deoxo-1 &"sehl2--emty-90dseh~aayi 3. 1 6-0desmethyl27-desmethoxy-39-0desmethylrapamycin 4. 9 -deoxo-27-desmethoxy-39O0desmethyl-rapamycin 5. 9-deoxo-16--emty 90demty-aayi 6. 9-deoxo-1 6-O.desmethyI-27-desmethoxyrapamycin 7. 1 6 -0-desmethyl-27-0-desmethyl39-0desmethyl-rapamycin 8. 9-ex-7Oemty-9--emty-aayi 9. 9-deoxo-16--emty 70demty-aayi 10. 1 6-0-desmethy-39-O-desmethyl-rapamycin 11. 16--emty 70demty-aayi 12. 16--emtyl2-emtox-aayi 13. 27-desmethoxy-39-O-desmethyl-rapamycin 14. 270dsehl3--emty-aayi 15. 9-deoxo-1 6-O-desmethyl-rapamycin 16. 9-deoxo-27-desmlethoxy-rapamycin 17. 9-deoxo-27-O-desmethyl-rapamycin 18. 9-deoxo-39-O-desmethyl-rapamycin 19. 9-deoxo-rapamycin 20. 16-0-desmethyl-rapamycifl 21. 27-O-desmethyl-rapamycin 22. 27-desmethoxy-rapamycin 23. 39-0-desmethyl-rapamycin 24. 8-deoxo-1 5-O-desmethyI-26-desmethoxy-38O0desmethyIproylrapamyI (pre-prolyirapamycin) 72 Compound no: Name: 25. deoxo-1 5 26. 1 27. 8 28. 8-deoxo-1 5-O-desmethy.38-Q-desmethyIproIylrapamycin 29. 8-deoxo-1 5-0-desmethy-26-desmethoxyproIylrapamycin 30. 1 31. 32. 8-deoxo-1 5-O-desmethy-26-O-desmethyIproIylrapamycin 33. 1 s 34. 15-O-desmethy-26-O-desmethyl.proIytrapamyan 35. 1 esmethy-26-desmethoxy-prolylrapamycin 36. 26 -desmethoxy-38-0-desmethyl-prolylrapamycin 37. 2 38.8-deoxo-1 5--desmethy-prolytrapamyci 39. 8-deoxo-26-desmethoxyprolylrapamycin 40. B-deoxo-26-O-desmethyIproIylrapamycin 41. B-deoxo-3 0-desmethyIprolylrapamycin 42. 8-deoxo-prolylrapamycif 43. 15-O-desmethy-prolylrapamycif 44. 26 desmethy-proIylrapamycif 45. 26-desmethoxy-proIylrapamycin 46. 38-0-desmethy-proIylrapamycin 47. 9-deoxo-1 x 48. 9-deoxo-1 6 49. 1 50. 9 51. 9-deoxo-1 6 52. 53. 9 54. 16-O-desmethy-39-desmethoxyrapamyctn 55. 27-desmethoxy-39-desm ethoxy-rapamycin 56. 27-0-desmethyl-39-desmethoxy-rapam ycin 57. 9-deoxo-39-desmethoxy-rapamcil 73 Compound no: Name: 58. 39-0-desmethoxy-rapamycin 59. 8-deoxo-i 5-0-desmethyl-26-desmethoxy-38-desmethoxy-prolylrapamycin 60. 8-deoxo-1 5-0-desmethyl-26--desmethyl-38-desmethoxy-prolylrapamycir 61. 15-0-desmt yl Z6-desmetoy-38-desmethoxy-prolylrapamycin 62. 8-deoxo-26-desmethoxy-38-desmethoxy-prolylrapamycin 63. 8-deoxo-1 5-O-desmethyl-38-desmethoxy-prolylrapamycin 64. 15-O-desmethyl-26-0-desmethy-38-desmethoxy-prolylrapamycin 65. 8-deoxo-26-O-desmethyl-38-desmethoxy-prolyrapamycin 66. 15-O-desmethyl-38-desmethoxy-prolylrapamycin 67. 26-desmethoxy-38-desmethoxy-prolylrapamycin 68. 26-O-desmethyl-38-desmethoxy-prolylrapamycin 69. 8-deoxo-38-desmethoxy-prolylrapamycin 70. 38-desmethoxy-prolylrapamycin 71 9-deoxo-16-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy4-trans hydroxycyclohexyI)-36-(hydroxycyclohexenyl) rapamycin 72 9-deoxo-16-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(dihydroxy cyclohexyl) rapamycin 73 9-deoxo-16-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxynorbomyl) rapamycin 74 9-deoxo- 27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-methyl-4-hydroxycyclohexyl) rapamycin 75 9-deoxo-16-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(4-methyl hydroxycyclohexyl) rapamycin 76 9-deoxo-16-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-fluoro-4-hydroxycyclohexyl) rapamycin 77 9-deoxo-1 6-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-hydroxy-4-fluorocyclohexyl) rapamycin 78 9-deoxo-1 6-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-chloro-4-hydroxycyclohexyl) rapamycin 79 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-hydroxy-4-chlorocyclohexyl) rapamycin 80 9-deoxo-16-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy4-trans hydroxycyclohexyl)-36-(3-cis-4-cis-dihydroxycyclohexyl) rapamycin 74 Compound no: Name: 81 9-deoxo-1 6-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-trans-4-trans-dihydroxycyclohexyl) rapamycin 82 9-deoxo-16-O-desmethyl-27-0-desmethyl-39-0-desmethy rapamycin 83 9-deoxo-16-0-desmethyl-270-desmethyl-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxycyclohexenyl) rapamycin 84 9-deoxo-1 6-0-desmethyl-27-0-desmethyl-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxynorbomyl) rapamycin 85 9-deoxo-16-0-desmethyl-27-0-desmethyl-36-de(3-cis-methoxy-4-trans hydroxycydohexyl)-36-(4-methyl hydroxycyclohexyl) rapamycin 86 9-deoxo-1 6-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxycycloheptyl) rapamycin 87 9-deoxo-1 6-O-desmethyl-27-0-desmethyl-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxycycloheptyl) rapamycin In a further aspect, the invention provides the following novel rapamycin analogues: Table III Compound Name: no: 1. 9-deoxo-16-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin (pre-rapamycin) 2. 9-deoxo-16-0-desmethyl-27-0-desmethyl-39-0-desmethyl-rapamycin 3. 16-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin 5. 9-deoxo-16-0-desmethyl-39-0-desmethyl-rapamycin 6. 9-deoxo-1 6-0-desmethyl-27-desmethoxy-rapamycin 7. 16-O-desmethyl-27-0-desmethyl-39-0-desmethyl-rapamycin 8. 9-deoxo-27-0-desmethyl-39-0-desmethyl-rapamycin 9. 9-deoxo-16-0-desmethyl-27-0-desmethyl-rapamycin 14. 27-0-desmethyl-39-O-desmethyl-rapamycin 15. 9-deoxo-16-O-desmethyl-rapamycin 18. 9-deoxo-39-O-desmethyl-rapamycin 24. 8-deoxo-1 5-O-desmethyl-26-desmethoxy-38-0-desmethyl prolylrapamycin (pre-prolylrapamycin) 25. 8-deoxo-1 5-0-desmethyl-26-0-desmethyl-38-0-desmethyl prolylrapamycin 75 Compound Name: no: 26. 15-O-desmethyl-26-desmethoxy-38-0-desmethyl-prolylrapamycin 27. 8-deoxo-26-desmethoxy-38-0-desmethyl-prolylrapamycin 28. 8-deoxo-1 5--desmethyl-38-0-desmethyl-prolylrapamycin 29. 8-deoxo-1 5-0-desmethyl-26-desmethoxy-prolytrapamycin 30. 15-0-desmethyl-26-0-desmethyl-38-0-desmethyl-prolylrapamycin 31. 8eoxo-26-0-desmethyl-38-0-desmethyl-prolylrapamycin 32. 8-deoxo-1 5-0-desmethyl-26-0-desmethyl-prolylrapamycin 33. 15-O-desmethyl-380-desmethyl-prolylrapamycin 34. 15-O-desmethyl-26-O-desmethyl-prolylrapamycin 35. 15-O-desmethyl-26-desmethoxy-prolylrapamycin 36. 26-desmethoxy-38-0-desmethyl-prolyrapamycin . 37. 26-O-desmethyl-38-0-desmethyl-prolylrapamycin 38. 8-deoxo-15-O-desmethyl-prolylrapamycin 40. 8-deoxo-26-0-desmethyl-prolylrapamycin 41. 8-deoxo-38-0-desmethyl-prolylrapamycin 43. 15-0-desmethyl-prolylrapamycin 46. 38-O-desmethyl-prolylrapamycin 47. 9-deoxo-1 6-0-desmethyl-27-desmethoxy-39-desmethoxy-rapamycin 48. 9-deoxo-16-0-desmethyl-27-0-desmethyl-39-desmethoxy-rapamycin 49. 16-0-desmethyl-27-desmethoxy-39-desmethoxy-rapamycin 50. 9-deoxo-27-desmethoxy-39-desmethoxy-rapamycin 51. 9-deoxo-16-0-desmethyl-39-desmethoxy-rapamycin 52. 16-O-desmethyl-27-0-desmethyl-39-desmehoxy-rapamycin 53. 9-deoxo-27-0-desmethyl-39-desmethoxy-rapamycin 54 16-0-desmethyl-39-desmethoxy-rapamycin 55. 27-desmethoxy-39-desmethoxy-rapamycin 56. 27-0-desmethyl-39-desmethoxy-rapamycin 57. 9-deoxo-39-desmethoxy-rapamycin 59. 8-deoxo-1 5-0-desmethyl-26-desmethoxy-38-desmethoxy prolylrapamycin 60. 8-deoxo-1 5--desmethyl-26-0-desmethyl-38-desmethoxy prolylrapamycin 76 Compound Name: no: 61. 1 5--desmethyl-26-desmethoxy-38-desmethoxy-prolylrapamycin 62. 8-deoxo-26-desmethoxy-38-desmethoxy-prolylrapamycin 63. 8-deoxo-1 5-O-desmethyl-38-desmethoxy-prolylrapamycin 64. 15-O-desmethyl-26-0-desmethyl-38-desmethoxy-prolylrapamycin 65. 8-deoxo-26.--desmethyl-38-desmethoxy-prolylrapamycin 66. 1 5-0-desmethy-38-desmethoxy-prolylrapamycin 67. 26-desmethoxy-38-desmethoxy-prolylrapamycin 68. 26-O-desmethyl-38-desmethoxy-prolylrapamycin 69. 8-deoxo-38-desmethoxy-prolylrapamycin 70. 38-desmethoxy-prolylrapamycin 71 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxycyclohexenyl) rapamycin 72 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy4-trans hydroxycyclohexyl)-36-(dihydroxy cyclohexyl) rapamycin 73 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxynorbomyl) rapamycin 74 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-methyl4-hydroxycyclohexyl) rapamycin 75 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy4-trans hydroxycyclohexyl)-36-(4-methyl hydroxycyclohexyl) rapamycin 76 9-deoxo-16-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-fluoro-4-hydroxycyclohexyl) rapamycin 77 9-deoxo-16-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy4-trans - hydroxycyclohexyl)-36-(3-hydroxy-4-fluorocyclohexyl) rapamycin 78 9-deoxo-1 6-0-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexy)-36-(3-chloro4-hydroxycyclohexyl) rapamycin 79 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4rans hydroxycyclohexyl)-36-(3-hydroxy4-chlorocyclohexyl) rapamycin 80 9-deoxo-16-O-desmethyl-27-desmethoxy-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(3-cis-4-cis-dihydroxycyclohexyl) rapamycin 81 9-deoxo-1 6--desmethyl-27-desmethoxy-36-de(3-cis-methoxy4-trans hydroxycyclohexyl)-36-(3-trans-4-trans-dihydroxycyclohexyl) rapamycin 82 9-deoxo-16-O-desmethyl-27-0-desmethyl-39-O-desmethyl rapamycin 77 Compound Name: no: 83 9-deoxo-1 6-O-desmethyl-270-desmethyl-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxycyclohexenyl) rapamycin 84 9-deoxo-16-O-desmethyl-27-0-desmethyl-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(hydroxynorbomyl) rapamycin 85 9-deoxo-1 6-O-desmethyl-27-0-desmethyl-36-de(3-cis-methoxy-4-trans hydroxycyclohexyl)-36-(4-methyl hydroxycyclohexyl) rapamycin In a further aspect, the invention provides novel rapamycin analogues of Formula II: 5 R4 y

R

3

R

6 R x . O0 OH

R

7 N

R

9 0 RR - HO where x= bond or CHR, or -CHRe-x-CHR 5 - is 10 78

CHR

11

R

1 3 _ R 1 4

C

y = bond or CHR 12

R

1 = OH, OCH 3 5 R 2 = H, OH, OCH 3

R

3 = H, OH, OCH 3 , alkyl-, halo-, amino-, thiol- residue R4= H, OH, OCH 3 , alkyl-, halo-, amino-, thiol- residue Rs= H, alkyl-, halo-, hydroxy- residue Re= H, alkyl-, halo-, hydroxy- residue 10 R 7 = H, alkyl-, halo-, hydroxy- residue Re, Re= =O or H,H

R

1 = H, alkyl-, halo-, hydroxy- residue

R

1 1 = H, alkyl-, halo-, hydroxy- residue

R

12 = H, alkyl-, halo-, hydroxy-residue 15 R 13 = H, alkyl-, halo-, hydroxy- residue

R

1 4 = H, alkyl-, halo-, hydroxy- residue Additionally, the present invention also provides novel rapamycin analogues of Formula IlIl: R15 Re R * Rio O O R7 N

R

9 00 Re O R2 HO 0H -, 20 where: x = bond or CHR 1 , or -CHRG-x-CHR 6 - Is 79 R13 /- R C C

R

1 = OH, OCH 3 5 R 2 = H, OH, OCH 3

R

5 = H, alkyl-, halo-, hydroxy- residue

R

6 = H, alkyl-, halo-, hydroxy- residue R7= H, alkyl-, halo-, hydroxy- residue R9, Rq= =O or H,H 10 R 10 = H, alkyl-, halo-, hydroxy- residue

R

1 1= H, alkyl-, halo-, hydroxy- residue

R

1 2 = H, alkyl-, halo-, hydroxy-residue

R

1 3 = H, alkyl-, halo-, hydroxy- residue R1 4 = H, alkyl-, halo-, hydroxy- residue 15 R 1 s= -R 1 1 R 1 7 , R 1 7 ' R 1 7

R

1 7

R

1 = OH

R

17 = H, OH, halo-, thiol-, alkyl 20 ,The novel rapamycin analogues are useful directly, and as templates for further semi-synthesis or bioconversion to produce compounds useful, as immunosuppressants, antifungal agents, anticancer agents, neuroregenerative agents or agents for the treatment of psoriasis, rheumatoid arthritis, fibrosis and other hyperproliferative diseases. 25 Therefore in a further aspect, the present invention provides use of the FKBP ligand analogues generated in the manufacture of a medicament for the treatment of cancer, the treatment of fungal infections, the treatment of autoimmune, Inflammatory, proliferative and hyperproliferative diseases or the maintenance of immunosuppression. 80 One skilled in the art would be able by routine experimentation to determine the ability of these compounds to inhibit fungal growth (e.g. Baker, H., et al., 1978; NCCLS Reference method for broth dilution antifungal susceptibility testing for yeasts: Approved standard M27-A, 17(9). 1997), and for example but without 5 limitation using the methods described in Example 19. Additionally, one skilled in the art would be able by routine experimentation to determine the ability of these compounds to inhibit tumour cell growth, for example but without limitation using the methods described in Example 19, (also see Dudkin, L., et al., 2001; Yu et al. 2001). In a further aspect the compounds of this invention are useful for inducing 10 immunosuppression and therefore relate to methods of therapeutically or prophylactically inducing a suppression of a human's or an animal's immune system for the treatment or prevention of rejection of transplanted organs or tissue, the treatment of autoimmune, inflammatory, proliferative and hyperproliferative diseases (examples include but are not inclusively limited to autoimmune diseases, diabetes 15 type I, acute or chronic rejection of an organ or tissue transplant, asthma, tumours or hyperprolific disorders, psoriasis, eczema, rheumatoid arthritis, fibrosis, allergies and food related allergies). Such assays are well known to those of skill in the art, for example but without limitation: Immunosuppressant activity - Wamer, L.M.,et al., 1992, Kahan et al. (1991) & Kahan & Camardo, 2001); Allografts - Fishbein, T.M., et 20 al., 2002, Kirchner et al. 2000; Autoimmune / Inflammatory / Asthma - Carlson, R.P. et al., 1993, Powell, N. et al., 2001; Diabetes I - Rabinovitch, A. et al., 2002; Psoriasis - Reitamo, S. et al., 2001; Rheumatoid arthritis - Foey, A., et aL., 2002; Fibrosis Zhu, J. et al., 1999, Jain, S., et al., 2001, Gregory et al. 1993 The ability of the compounds of this invention to induce immunosuppression 25 may be demonstrated in standard tests used for this purpose, for example but without limitation using the methods described in example 19.: In a further aspect the compounds of this invention are useful in relation to antifibrotic, neuroregenerative and anti-angiogenic mechanisms, one skilled in the art would be able by routine experimentation to determine the ability of these compounds to prevent angiogenesis 30 (e.g. Guba, M.,et aL., 2002, ). One of skill in the art would be able by routine experimentation to determine the utility of these compounds in stents (e.g. Morice, M.C., et al., 2002). Additionally, one of skill in the art would be able by routine experimentation to determine the neuroregenerative ability of these compounds (e.g. Myckatyn, T.M., et aL., 2002, Steiner et aL. 1997) 35 81 Brief description of the Figures Figure 1 Structure of rapamycin, the sections to the left of the line represent the binding domain and those to the right indicate the effector domain. 5 Figure 2 Structure of rapamycin (A), FK-506 (B), FK-520 (C) and meridamycin (D) Figure 3 Plasmid map of pMG55, a double recombination vector with RpsL positive selection and onT for conjugation. Figure 4 A flow chart demonstrating the cloning strategy for the isolation of 10 pMAG144-16 to create MG2-10. Figure 5 Overview over the gene cassettes Figure 6 Structure of 9-deoxo-16-O-desmethyl-27-desmethoxy-39-0-desmethyl rapamycin Figure 7 Structure of 9-deoxo-16-0-desmethy-27-desmethoxy-39-0-desmethyI 15 prolylrapamycin Figure 8 Structure of 9-deoxo-16-0-desmethyl-27-desmethoxy-39-desmethoxy rapamycin Figure 9 Structure of 16-0-desmethyl-27-desmethoxy rapamycin Figure 10 Structures of compounds 1, 2, 4, 5, 6, 8, 9, 15, 16, 17, 18 and 19 20 Figure 11 Structures of compounds 3, 7, 10, 11, 12, 13, 14, 20, 21, 22 and 23 Figure 12 Structures of compounds 24, 25, 27,28, 29, 31, 32, 38, 39, 40, 41 and 42 Figure 13 Structures of compounds 26, 30, 33, 34, 35, 36, 37, 43, 44, 45, and 46 Figure 14 Structures of compounds 47, 48, 50, 51, 53 and 57 25 Figure 15 Structures of compounds 49, 52, 54, 55, 56, and 58 Figure 16 Structure of compounds 61, 64, 66, 67, 68, and 70 Figure 17 Structure of compounds 59, 60, 62, 63, 65, and 69 Figure 18 Pre-rapamycin heteronuclear multiple bond coherence HMBC Figure 19 Pre-rapamycin heteronuclear multiple quantum coherence HMQC 30 Figure 20 Pre-rapamycin correlation spectroscopy (COSY) indicated by solid arrows, Pre-rapamycin total correlation spectroscopy (TOCSY) indicated by dotted arrows. Figure 21 Corrections in the DNA sequence of rapN, the corrected sequence is shown on top (5EQ ID NO: 1) and the published sequence (acc no: 35 X86780, nt 91764-92978) is shown underneath (SEQ ID NO: 2). 82 Figure 22 Corrections in the amino acid sequence of RapN, the corrected sequence is shown on top (SEQ ID NO: 3) and the published sequence (acc no: X86780) is shown underneath (SEQ ID NO: 4). Figure 23 Corrections in the DNA sequence of rapM, the corrected sequence is 5 shown on top (SEQ ID NO: 5) and the published sequence (acc no: X86780, nt 92992-93945 complement) is shown underneath (SEQ ID NO: 6). Figure 24 Corrections In the amino acid sequence of RapM, the corrected sequence is shown on top (SEQ ID NO: 7) and the published 10 sequence (acc no: X86780) is shown underneath (SEQ ID NO: 8). Figure 25 Corrections in the DNA sequence of rapL, the corrected sequence is shown on top (SEQ ID NO: 9), the published sequence (acc no: X86780, nt 94047-95078 complement) is shown at the bottom (SEQ ID NO: 10). 15 Figure 26 Corrections in the amino acid sequence of RapL, the corrected sequence is shown at the top (SEQ ID NO: 11) and the published sequence (acc no: X86780) is shown underneath (SEQ ID NO: 12) Figure 27 Corrections in the DNA sequence of rapK, the corrected sequence is shown at the top (SEQ ID NO: 13) and the published sequence (acc 20 no: X86780, nt 95430-96434) is shown at the bottom (SEQ ID NO: 14). Figure 28 Corrections in the amino acid sequence of RapK, the corrected sequence is shown at the top (SEQ ID NO: 15) and the published sequence (acc no: X86780) is shown underneath (SEQ ID NO: 16). 25 Figure 29 Corrections In the DNA sequence of rapJ, the corrected sequence is shown at the top (SEQ ID NO: 17) and the publshed sequence (acc no: X86780, nt 96465-97625) is shown at the bottom (S EQ I D NO: 18). Figure 30 Corrections in the amino acid sequence of RapJ, the corrected 30 sequence is shown at the top (SEQ ID NO: 19) and the published sequence (acc no: X86780) is shown underneath (SEQ ID NO: 20). Figure 31 Corrections in the DNA sequence of rap, the corrected sequence is shown at the top (SEQ ID NO: 21) and the published sequence (ac no: X86780, nt 97622-98404) is shown at the bottom (SEQ ID NO: 35 22). 83 Figure 32 Corrections in the amino acid sequence of Rapl, the corrected sequence is shown at the top (SEQ ID NO: 23) and the published sequence (acc no: X86780) is shown underneath (SEQ ID NO: 24). Figure 33 Corrections in the DNA sequence of rapQ, the corrected sequence is 5 shown at the top (SEQ ID NO: 25) and the published sequence (acc no: X86780, nt 90798-91433) is shown at the bottom (SEQ ID NO: 26). Figure 34 Corrections in the amino acid sequence of RapQ, the corrected sequence is shown at the top (SEQ ID NO: 27) and the published 10 sequence (acc no: X86780) is shown underneath (SEQ ID NO: 28). Figure 35 A flow chart demonstrating the cloning strategy for the isolation of pMG278-1 to create MG3. Figure 36 A flow chart demonstrating the cloning strategy for the isolation of pMG267-1 to create MG4. 15 Materials and Methods 20 Materials All molecular biology enzymes and reagents were from commercial sources. D/L pipecolic acid was obtained from Sigma. Starter materials 25 Table IV summarises the sources of the acids used in the feeding experiments described in the Examples section. For those compounds that were purchased details of the source are given. A brief synthetic method is given for those starter acids that were synthesised in house. A person of skill in the art will appreciate that variations on the methods described are routine and are within the 30 scope of the present invention. Table IV SCompany Stock synthesis number cyclohexane carboxylic acid Aldrich 10,83-4 in house by method of Lowden PhD thesis 1-cyclohexene carboxylic acid Aldrich 32,836-7 84 Acid Company Stock synthesis number 3-cyclohexene carboxylic acid Aldrich 45,375-7 cycloheptane carboxylic acid Aldrich C9,850-0 methyl-2-norbomane carboxylate Aldrich S40,932-4 2-(cis/trans)-hydroxycyclohexane U. Nottingham Syn by Dr R Goss carboxylic acid 3-(cis/trans)-hydroxycyclohexane U. Nottingham Syn by Dr R Goss carboxylic acid 4-(cis/trans)-hydroxycyclohexane U. Nottingham Syn by Dr R Goss carboxylic acid 2-(cis/trans)-methylcyclohexane Aldrich 33,060-4 carboxylic acid 3-(cis/trans)-methylcyclohexane Aldrich 33,061-2 carboxylic acid 4-(cis/trans)-methylcyclohexane Aldrich 33,062-0 carboxylic acid 3-(cis/trans)-methoxycyclohexane Aldrich 33,283-6 carboxylic acid 4-(cis/trans)-methoxycyclohexane Aldrich 33,284-4 carboxylic acid ethyl 4-cyclohexanone carboxylate Aldrich 32,062-5 ethyl 2-cyclohexanone carboxylate Aldrich 16,699-5 4-trans-n-pentylcyclohexane Aldrich 26,160-2 carboxylic acid 2-trans-aminocyclohexane Aldrich A7331 carboxylic acid 4-cis-aminocyclohexane carboxylic Aldrich 40,485-3 acid 4-(cistrans)-(aminomethyl)- Aldrich S42,955-4 cyclohexane carboxylic acid Cyclopentane carboxylic acid Aldrich C1 1,200-3 Cyclobutane carboxylic acid Aldrich C9,560-9 1-methylcyclohexane carboxylic acid' Aldrich 14,282-4 Mixture of 3-trans-hydroxy-4-cis- in house, Method fluorocyclohexane carboxylic acid B and 4-trans-hydroxy-3-cis-. fluorocyclohexane carboxylic acid OR mixure of 3-cis-hydroxy-4-trans fluorocyclohexane carboxylic acid and 4-cis-hydroxy-3-trans fluorocyclohexane carboxylic acid mixture of 3-cis-hydroxy-4-trans- in house, Method chlorocyclohexane carboxylic acid C and 4-c/s-hydroxy-3-trans chlorocyclohexane carboxylic acid Mixture of 3-:trans-hydroxy-4-cis- in house, Method chlorocyclohexane carboxylic acid C and 4-trans-hydroxy-3-cis chlorocyclohexane carboxylic acid 3-trans-cyclohexeneoxide carboxylic in house, Method acid _A 85 Acid Company Stock synthesis number 3-cis-cyclohexeneoxide carboxylic in house, Method acid ._A Mixture of 3,4-cis- in house, Method dihydroxycyclohexane carboxylic D acid and 3,4-trans dihydroxycyclohexane carboxylic acid Cyclohexaneacetic acid Aldrich C10,450-7 Cyclohexanepropionic acid Aldrich 16,147 4-cis/trans-tert-butylcyclohexane Aldrich 37,493-8 carboxylic acid Synthesis of 3-cis,4-trans-dihydroxycyclohexane carboxylic acid 0 0 0 OH mCPBA KOH HO OH Et 3 N

THF/H

2 0 II HaHO 5 Racemic 3-cis,4-trans-dihydroxycyclohexane carboxylic acid was readily attainable from commercially available racemic 3-cyclohexene carboxylic acid. This acid was epoxidised through treatment with meta-chloroperbenzoic acid and converted to the lactone in situ by the addition of base (triethylamine), thus setting up the relative 10 stereochemistries. This lactone was then hydrolysed by the action of aqueous potassium hydroxide, and the final product purified over ion exchange resin, (see PAS Lowden Thesis 1997, Corey, E. J. and Huang, H., 1989). Method A: A 0 O 0 O O OH Et 3 N, IBCF mCPBA 0

HOCH

2

CH

2 SiMe 3 Epoxides A and B were synthesised by standard steps. Cyclohex-3-ene carboxylic acid was protected with 2-trimethylsilylethanol following activation with isobutylchloroformate and triethylamine. The resultant ester was treated with meta chloroperbenzoic acid and the resultant racemic mix of diastereomers separated on 20 normal phase silica. The epoxides were either reacted on (see below) or deprotected directly by the treatment of trifluoroacetic acid, to liberate the respective free acids. 86 Method B: 0 O F oOHF-pyridine HO HO O F 5 A protected epoxide was treated with anhydrous HF-pyridine to effect the ring opening to produce a pair of racemic regiomers, containing F and OH in a trans arrangement (as previously demonstrated for cyclohexene oxide). The esters were then deprotected with trifluoroacetic acid to liberate the free acids, (see Welch, J. T. 10 and Seper, K., W., 1988) Method C C 1 O O cHCI H O HO CI&O"i 15 A protected epoxide was treated with concentrated hydrochloric acid suspended organic solvent to affect the ring opening to produce a pair of racemic regiomers, containing Cl and OH in a trans arrangement (as previously demonstrated for cyclohexene oxide). The esters were then deprotected with trifluoroacetic acid to liberate the free acids, (see Chini, M., Crotti, P., et al., 1992) 20 Method D 0)Y *S 050 O HO 25 cis-dihydroxyicyclocarboxylic acids were generated by treating protected epoxides with a catalytic amount of osmium tetraoxide together with a co-oxidant. The esters were then deprotected with trifluoroacetic acid to liberate the free acids. 87 Bacterial strains and growth conditions Escherichia coil DH 1OB (GibcoBRL) was grown in 2xTY medium as described by Sambrook et al. (1989) and E. co/i ET12567(pUB307) as described in MacNeil et al. (1992) and E. coli ET12567(pUZ8002) as described in Paget et al. (1999) in 2xTY 5 medium with kanamycin (25 pg/mI). The vectors pUC1 8 and Litmus28 were obtained from New England Biolabs. Vector pSET152 is described in Bierman et al., (1992a). E. colitransformants were selected for with 100 g/ml ampicillin or 50 pg/mI apramycin. The rapamycin producer S. hygroscopicus ATCC29253 and its derivatives 10 were maintained on medium I agar plates (see below) at 26*C, and cultivated in TSBGM (Tryptic Soy Broth with 1.0 % glucose and 100 mM MES, pH 6.0) as described in (Khaw et al., 1998), supplemented with 100 pg/mI apramycin when required. Liquid cultures were grown at 25"C in side-baffled Erlenmeyer flasks with 15 shaking at 300 rpm. The streptomycin resistant mutant S. hygroscopicus MG1 C was selected using standard procedures and maintained on medium 1 with streptomycin (50pg/ml). 20 Feeding methods: Spore stocks of all strains were prepared after growth on medium 1, preserved In 20% w/v glycerol:1 0% w/v lactose in distilled water and stored at -80 *C. Vegetative cultures were prepared by inoculating 100pl of frozen stock into 50ml medium 6 in 250ml flask. The culture was incubated for 36 to 48 hours at 28 "C, 25 250rpm. Feeding procedure: Vegetative cultures were inoculated at 0.5 ml into 7ml medium 7 in 50ml tubes. Cultivation was carried out for 7 days, 260C, 250rpm. The feeding/addition of the selected carboxylic acids ("non-natural starters" or "natural 30 starters") were carried out at 24 and 48 hours after inoculation and were fed at ImM or 3mM. Medium 1: Modified A-medium component Source Catalogue # gl1 Com steep powder Sigma C-8160 2.5 g 88 Yeast extract Difoc 0127-17 3 g Calcium carbonate Sigma C5929 3 g Iron sulphate Sigma F8633 0.3 g BACTO agar 20 g Wheat starch Sigma S2760 10 g Water to 1 L The media was then sterilised by autoclaving 121 0 C, 15 min. Medium 2 (Box et al.,. 1995) component g/L Soy peptone-SL (Marcor) 10 Glucose (Sigma G-7021) 20 Baker's Yeast 5 NaCl (Sigma) 2 Trace Elements ZnSO 4 .7H 2 0 0.05 MgSO 4 . 7H 2 0 0.125 MnSO 4 .4H 2 0 0.01 FeSO 4 .7H 2 0 0.02 Adjust pH to 7.0 5 Medium 3 (Wilkinson et al., 2000) component g/L Dextrose (Sigma) 15 Glycerol-(BDH-Merck) 15 Soypeptone (Marcor-SL) 15 NaCl (Fisher) 3 CaCO 3 (Sigma) 1 Medium 4 (U.S. Patent No. 3,993,749) Component g/L Soybean flour (Arkasoy 50) 30 Glucose (Sigma G-7021) 20 89 Ammonium sulphate 15

KH

2

PO

4 (Sigma) 5. Trace Elements ZnSO 4 .7H 2 0 0.05 MgSO 4 .7H 2 0 0.125 MnSO 4 .4H 2 0 0.01 FeSO 4 .7H 2 0 0.02 Adjust pH to 6.0 Medium 5 (Box et al., 1995) Component g/L Soybean flour (Arkasoy 50) 20 Glucose (Sigma G-7021) 20 Baker's Yeast 6

K

2

HPO

4 (Sigma) 2.5

KH

2

PO

4 (Sigma) 2.5 NaCl (Sigma) 5 Glycerol (BDH) 30 Soybean oil 10 Trace Eements ZnSO 4 .7H 2 0 0.05 MgSO 4 .7H 2 0 0.125 MnSO 4 . 4H 2 0 0.01 FeSO 4 . 7H 2 0 0.02 Adjust pH to 6.4 Medium 6: Rap V7 Seed medium Component. Per L Soy bean flour (Nutrisoy) 5g Dextrin (White, Prolab) 35g Com Steep Solids (Sigma) 4g Glucose . log

(NH

4

)

2

SO

4 2g Lactic acid (80%) 1.6ml 90 CaCO 3 (Sigma) 7g Adjust pH to 7.5 with 1 M NaOH. Medium 7: MD6 medium (Fermentation medium) Component Per L Soy bean flour (Nutrisoy) 30g Com starch (Sigma) 30g Dextrin (White, Prolab) 1 9g Fructose 20g Yeast (Alinson) 3g Com Steep Solids (Sigma) 1g L-Lysine 2.5g

KH

2

PO

4 2.5g

K

2

HPO

4 2.5g (NH4) 2

SO

4 1 Og NaCl 5g CaCO 3 (Caltec) 1Og MnCL 2 x4H 2 0 10mg MgSO 4 x7H 2 0 2.5mg FeSO 4 x7H 2 O 120mg ZnSO 4 x7H 2 O 50mg MES (2-morpholinoethane sulphuric acid monohydrate) 21.2g pH is corrected to 6.0 with IM NaOH Before sterilization 0.4ml of Sigma c-amylase (BAN 250) is added to 1L of medium. Medium is sterilised for 20min at 121*C. 5 Mediuni 8: MD3 medium (fermentation medium) Component Per L Soy flour (Nutrisoy) 31.25 g White Dextrin (Prolab) 18.75 g

KH

2

PO

4 5 g

(NH

4

)

2

SO

4 1.25 g MnCI 2 .4H 2 0 10 mg MgSO 4 .7H 2 0 2.5 mg 91 FeSO 4 .7H20 120 mg ZnSO4.7H20 50 mg SAG 417 1.2 mL pH to 6.4 with NaOH L-lysine 0.625 g Glucose (40 % w/v) 50 mL Description of Strains All strains shared the wild type morphology, with cream vegetative mycelia, 5 white aerial hyphae, developing grey spores turning black and characteristically hygroscopic. Preferably spores for use in the generation of the recombinant strains as described herein were dark grey in colour, as defined in Fan 4, 202 C to B, more preferably they are as defined in Fan 4, 202 B (Royal Horticultural Society Colour 10 Chart 2001, available from The Royal Horticultural Society, 80 Vincent Square, London, SW1P 2PE). DNA manipulation and sequencing 15 DNA manipulations, PCR and electroporation procedures were carried out as described in Sambrook et al. (1989). Southern hybridisations were carried out with probes labelled with digoxigenin using the DIG DNA labelling kit as described by the manufacturer (Boehringer Mannheim). DNA sequencing was performed as described previously (Gaisser et al., 2000). 20 Fermentation of Streptomyces hygroscopicus strains. Streptomyces hygroscopicus strains were cultured from a frozen spore stock in cryopreservative (20% glyceroli 10% lactose w/v in distilled water) on Medium 1 (see Materials and Methods) and spores were harvested after 10-20 days growth at 25 29 0 C. Alternatively, spores from frozen working stocks were inoculated directly into pre-culture medium. A primary pre-culture was inoculated with the harvested spores and cultured in 250 ml Erlenmeyer flasks containing 50 ml Medium 6 (see Materials and Methods), shaken at 250 rpm with a two-inch throw, at 30 0 C, for two days. The primary pre-culture was used to inoculate secondary pre-cultures of Medium 6 (see 92 Materials and Methods), at 10% v/v, which was shaken at 300 rpm with a one-inch throw, at 28*C, for a further 24h. Secondary pre-cultures were used to inoculate, at 10% v/v, production Medium 8 (see Materials and Methods) containing 0.01% v/v SAG 417 antifoam and allowed to ferment in a stirred bioreactor for five to seven 5 days at 26*C. Airflow was set to 0.75 vvm, over pressure at 0.5 bar and the impeller tip speed was controlled between 0.98 ms' and 2.67 ms'. Additional SAG 417 was added on demand. pH was controlled at 6 - 7 with ammonium (10% v/v) or sulphuric acid (1 M) and glucose solution (40% w/v) was drip fed on initiation of ammonium demand. 10 Extraction and High Performance Liquid Chromatography (HPLC) analysis Method Centrifugation was carried out on 50 ml of the fermentation broth and the supernatant and the mycelium were extracted separately as follows. The mycelia 15 were washed with H 2 0 and extracted with 50 ml of methanol for 16 hours at 4 0 C. The cell debris was removed by centrifugation, the methanol evaporated to dryness then dissolved In 200 d methanol. The supernatant of the fermentation broth was extracted twice with an equal volume of ethyl acetate. The organic layer was dried over Na 2

SO

4 , evaporated to dryness and then dissolved in 200 pl methanol. HPLC 20 analysis was performed on a Hewlett Packard HP1 100 liquid chromatograph with variable wavelength detector or a Finnigan MAT LCQ (Finnigan, CA) instrument. High-resolution spectra were obtained on a Bruker BioApex 11 4.7 T Fourier Transform-Ion Cyclotron Resonance (FT-ICR) mass spectrometer (Bruker, Bremen, FRG). 25 For NMR analysis, the bacterial broth was centrifuged, the supernatant extracted with three equal volumes of ethylacetate and the mycelia extracted with methanol as described above. The extracts were combined, dried (Na 2

SO

4 ) and evaporated under reduced pressure to yield a white solid. Proton detected NMR spectra ('H, DQF-COSY, TOCSY, HMQC, HMBC, 30 NOESY) were recorded on a Bruker Advance DRX500 spectrometer which operated at 500 MHz at 27 *C, with the exception of example 6, where the Bruker Advance DRX500 spectrometer was operated at 500 MHz at 1 0*C. Chemical shifts are described in parts per million (ppm) on the 8 scale and are referenced to CHCa at 8H 7.26 ('H) and CHC 3 at 8c 77.0 ("C). J values are given in Hertz (Hz). 35 93 Extraction, isolation and analysis Protocols (B). Extraction and purification protocol: The fermentation broth was clarified by centrifugation to provide supernatant and cells. The supernatant was applied to a column (16 x 15 cm) of Diaion* HP20 resin 5 (Supelco), washed with water followed by 75% MeOHIH 2 0 and then eluted with MeOH. The cells were mixed to homogeneity with an equal volume of acetone. After at least 30 minutes the acetone slurry was clarified by centrifugation and the supernatant decanted. The pelleted cells were similarly extracted twice more with acetone. The acetone extract was combined with the MeOH from the HP20 column 10 and the solvent was removed In vacuo to give an aqueous concentrate. The aqueous (typically 1-2 L) was extracted with EtOAc (3 x 1-2 L) and the solvent removed In vacuo to give an oily crude extract (typically 20 g). The oily residue was dissolved in a minimal volume of EtOAc and dried onto silica. The coated silica was applied to a silica column (400g, 36 x 6 cm) that was eluted sequentially with acetone/hexane 15 mixtures ranging from 25% acetone Initially to 100% acetone. The fractions containing rapamycin analogues were identified by HPLC (280 nm) using conditions described within. The rapamycin analogue-containing fractions were combined and the solvent was removed in vacuo. The residue was further chromatographed over Sephadex LH20, 20 eluting with 10:10:1 chloroform/heptane/ethanol. The semipurified rapamycin analogues were purified by reverse phase (C18) high performance liquid chromatography using a Gilson HPLC, eluting a Phenomenex 21.2 x 250 mm Luna 5 sm C18 BDS column at 21 mL/min, isocratic elution with 50% to 70% CH 3

CN/H

2 0 mixtures depending on the polarity of the rapamycin analogue. 25 Analysis of culture broths An aliquot of whole broth (1 mL) was shaken with CH 3 CN (1 mL) for 30 minutes. The mixture was clarified by centrifugation and the supernatant analysed by HPLC with diode array detection. The HPLC system comprised an Agilent HP 1100 equipped 30 with a BDS HYPERSIL C18 3 pm 4.6 x 150 mm column (ThermoHypersil-Keystone) heated to 400C. The gradient elution was from 55% mobile phase B to 95% mobile phase B over 10 minutes followed by an isocratic hold at 95% mobile phase B for 2 minutes with a flow rate of 1 m/min. Mobile phase A was 10% acetonitrile:90% water, containing 10 mM ammonium acetate and 0.1% trifluoroacetic acid, mobile 35 phase B was 90% acetonitrile:10% water, containing 10 mM ammonium acetate and 94 0.1% trifluoroacetic acid. Rapamycin analogues were identified by the presence of the characteristic rapamycin triene, centred on 278 nm. FK506 and FK520 analogues are identified by LC-MS analysis. 5 Analysis by LCMS The HPLC system described above was coupled to a Bruker Daltonics Esquire3000 electrospray mass spectrometer. The same column and gradient elution scheme were used as described above. Mobile phase A was water, mobile phase B was acetonitrile. Positive negative switching was used over a scan range of 500 to 1000 10 Dalton. Example I Conjugation of S. hygroscopicus 15 The plasmid to be conjugated into S. hygroscopicus was transformed by electroporation into the camf dcnf ET1 2567 E coli strain containing either pUB307 as described in MacNeil et al. (1992) or pUZ8002 as described in Paget et al. (1999). A preculture was used (over night culture, 30 0 C) to inoculate fresh 2xTY (with 50 Rg/ml apramycin and 25 pg/ml kanamycin) at a dilution of 1/25 and grown with 20 shaking at 37 0 C to an optical density at 595 nm of 0.25-0.6. The cells from this broth were washed twice with 2xTY, then resuspended with 0.5 ml of 2xTY per 25 ml original culture. The quality of the spore stock used is critical for the success of this method. In this context the age of the spores when harvested and the use of medium I are crucial for the isolation of high-quality spore suspension. To isolate high- quality 25 spore suspensions of S. hygroscopicus, pre-dried plates of medium 1 agar (see Materials and Methods section) were spread with S. hygroscopicus spores or mycelia using sfandard microbiological techniques followed by incubation at 26*-28"C for 14 21 days. Spores were harvested by addition of 1-2 ml of sterile 20 % w/v glycerol or water by standard. techniques. An aliquot of 200 pl of the S. hygroscopicus spore 30 suspension was washed in 500 pl of 2xTY, resuspended in 500 pl of 2xTY, subjected to heat shock at 50*C for 10 minutes then cooled on ice. An aliquot of 0.5 ml of the E coil suspension was mixed with the heat-shocked spores and this mixture plated on medium 1 agar plates. These plates were incubated at 26 0 -28 0 C for 16 hours before overlaying with 1 mg of nalidixic acid and I mg of apramycin per plate. Exconjugant 35 colonies usually appeared after 3-7 days. 95 Use in S.hygroscopicus MG2-10 of an alternative integrating vector, pRT8OI Conjugation was also carried out using the OBT1 -based integrating vector pRT801 into S.hygroscopicus MG2-10 as described above. Exconjugants were 5 patched on to medium .1 containing 50pg/ml apramycin and 50pg/ml nalidixic acid, and shown to be apramycin resistant Example 2 10 Isolation of the S. hygroscopicus mutant MG2-10 carrying the chromosomal deletion of rapQONMLKJI (Figure 4). An S. hygroscopicus mutant (MG2-1 0) in which the rapamycin modifying genes rapQ, rapO/N, rapM, repL, rapK rapJ and rap/ were deleted was constructed 15 as described below. Isolation of the streptomycin resistant mutant MGI C: S.hygroscopicus NRRL5491 mycelia were spread onto plates of medium I containing 50mg/ml streptomycin. Three colonies were isolated and labelled MGIA, 20 MG1B and MG1C. These were conjugated as in example I with the plasmid pMG49, a derivative of pSET152 containing the rpsL gene from S.lividans TK24. Exconjugants from each of these conjugations were patched onto a plate if medium I containing 50mg/mi apramycin and 50mg/ml nalidixic acid, to confirm the presence of the plasmid pMG49. They were then streaked, along with the original strains MG1A, 25 MG1 B and MG IC, onto a both a plate of medium 1 containing no antibiotic and a plate of.mediuml containing 50mg/ml streptomycin. Growth was seen in all cases except The streaks of MG1A [pMG49], MG1B [pMG49] and MG1C [pMG49] on streptomycin, indicating that the w.t. rpsL gene from S.lividans TK24 conferred dominant streptomycin sensitivity on these strains. The production of pre-rapamycin 30 was measured In MGIA, MG1B and MG1C and the best producer, MG1C, was kept for further work. Conjugation of S. hygroscopicus MG1C Conjugations were carried out as described in example 1 using the 35 streptomycin resistant S. hygroscopicus MG1 C and vector pMG55 derived 96 constructs. Construction of conjugative double recombination vector pMG55 (Figure 3) The primers MAG47 5'-GCAAGCTTGGTACCGACACGCTCGCCGAACAGG 5 3' (SEQ ID NO: 29) and MAG48 5'-GCGCATGCCCTAGGGTGTACATTACTTCTCC 3' (SEQ ID NO: 30) were used to amplify the S.lividans rpsL gene using the plasmid pRPSL21 (Shima et a., 1996) as a template. The PCR fragment was digested with Sphl and HindIll, isolated and ligated with the 3.2 kb fragment of pSET1 52 (Bierman et af., 1992b), which had been digested with Sphl and HindIll. After transformation 10 into E coil DH1OB, plasmid pMG55 was isolated. This plasmid was confirmed by sequencing. Plasmid pMG55 contains the rpsL gene to allow selection for double recombinants (Hosted and Baltz, 1997). Isolation of the S. hygroscopicus mutant MG2-10 canying the chromosomal deletion 15 of rapQONMLKJI (Figure 4) The primers MAG23 5'-TATCTAGACTTCGCACGTGCCTGGGACA-3' (SEQ ID NO: 31) and MAG24-5'-AGAAGCTTACCCAATTCCAACATCACCT-3' (SEQ ID NO: 32) were used to amplify the left region of homology (from nt 89298 to nt 90798 in the rapamycin cluster as described in Schwecke et al.(Schwecke et al., 1995) 20 using genomic DNA prepared from S. hygroscopicus NRRL5491 as a template. The 1.5 kb PCR product was digested with Xbal and Hindill and ligated into pUC18 cut with Xbal and Hindill. After transformation into E coli DH1OB, the plasmid pMAG127 8 was isolated. The primers MAG25 5'-GGAAGCTTTGACCACACGCCGCCCGTTC 3' (SEQ ID NO: 33) and MAG26 5'-ATGCATGCCCGCCGCAACCCGCTGGCCT-3' 25 (SEQ ID NO: 34) were used to amplify the right region of homology (from nt 98404 to nt 99904 in the rapamycin cluster as described in Schwecke et al. (1995)) using genomic DNA prepared from S. hygroscopicus NRRL5491 as a template. The 1.5 kb product of PCR was digested with Hind ll1 and Sphl and ligated into pUC1 8 cut with Hindlll and Sphl. After transformation into E. coli DH1OB, the plasmid pMAG128-2 30 was isolated (Figure 4). Both plasmids were checked by sequence analysis. The plasmid pMAG127-8 was digested with Sphl and HindIll, the plasmid pMAG128-2 was digested with Xbal and Hindlli and the 1.5 kb fragments were isolated from both plasmids. These fragments were ligated into pUC1 8 cut with Sphl and Xbal and used to transform E coli DHIOB. The plasmid pMAG131-1 was isolated. This plasmid was 35 digested with Sphil and Xbal, the 3 kb fragment was isolated and ligated into pMG55 97 cut with Sphl and AvrIl and the DNA was used to transform E coli DHIOB. The plasmid pMAG144-16 was isolated and used to conjugate S. hygroscopicus MG1C. An apramycin resistant S. hygroscopicus colony was isolated, grown for 24 hours in TSBGM with shaking at 26 0 C, and spread onto medium 1 agar plates containing 50 5 ig/I streptomycin.- Streptomycin resistant colonies were isolated and shown to be apramycin sensitive. The 7606 nt chromosomal deletion of the rapQONMLKJI region of the rapamycin cluster was verified in the mutant MG2-1 0 by using the 1.5 kb PCR product of MAG23 and MAG24 to probe EcoRl- and BamHi-digested chromosomal DNA. Analysis of the wild type S. hygroscopicus showed the expected 5.8 kb EcoRI 10 and 5.9 kb BamHl band after hybridisation. When chromosomal DNA of MG2-10 was treated similarly, 9.6 kb EcoRI and 7.6 kb BamHl bands were detected, indicating that rapQONMLKJI had been removed. Example 3 15 Expression of rapK in the S. hygroscopicus mutant MG2-10 carrying the chromosomal deletion of rapQONMLKJI (Figure 4) Construction of expression vector pSGsetl The pSET1 52 (Bierman et al., 1992a) derived vector pCJR336 (kindly 20 provided by Christine Martin and Corinne Squire) was created by cloning the primer dimer of CR347 5' TAAACTAGTCCATCTGAGAGTTTCATATGGCCCTATTCTGCCCAGCCGCTCTAG AAAT-3' (SEQ ID NO: 35) and CR348 5' ATTTCTAGAGCGGCTGGGCAGAATAGGGCCATATGAAACTCTCAGATGGACTAG 25 TTTA -3' (SEQ ID NO: 36) into Pvull digested pSETI52 using standard molecular biological techniques, thus introducing sites for the restriction enzymes Spel, Ndel, and Xbal into pSET1 52. The orientation of the insert was confirmed by sequencing. Plasmid pCJR336 was digested using the restriction enzymes NdelISpel and vector pSGI42 (Gaisser et al., 2000) was digested identically. The resulting DNA bands of 30 about 5.4 kb for pCJR336 and 1.2 kb for pSG142 were isolated followed by a ligation which was used to transform E. coli DHIOB. The vector construct containing the actI/-ORF4 regulator region was isolated and digested using the restriction enzyme Xbal follovied by an alkaline phosphatase treatment according to standard protocols. The isolated DNA was ligated with a fragment of about 200 bp from plasmid 35 pEXoleG2cas (pSG142 derivative containing the ca. 1.2kb Ndel/Bgil fragment of 98 pSGcasOleG2 (WO01/79520) digested with the restriction enzymes Xbal and Nhel. Vector pSGsetl was Isolated and the correct orientation of the insert was verified using restriction digests and sequence analysis. Plasmid pSGsetl contains the act/I ORF4 regulator, the Pacu promoter and the 6xHis-tag coding sequence as well as the 5 lambda to transcriptional termination region (originating from plasmid pQE-16) and it can integrate site-specifically at the OC31 attachment site. Cloning of rapK The gene rapK was amplified by PCR using the primers BIOSG8 5' 10 GGGCATATGAGGCAATTGACTCCGCCGGTCACGGCACCGTACTGCC -3' (SEQ ID NO: 37) and BIOSG9 5' GGGGTCTAGAGGTCACGCCACCACACCCTCGATCTCGACC -3' (SEQ ID NO: 38), which introduce a Ndel site at the 5' end and a Xbal site at the 3' end of rapK. Plasmid pR19 (Schwecke et al., 1995) was used as a template. After treatment with 15 T4 polynucleotide kinase using standard techniques the PCR. product was ligated with Smal-cut pUC18 and used to transform E. col DHI10. The DNA sequence of rapK in the isolated plasmid pUCrapK was verified by sequence analysis. The. differences in the DNA sequence compared to the published sequence (acc. no. X86780) are shown in Figure 27. The resulting changes in RapK are shown in Figure 20 28. Isolation of pSGsetrapK Plasmid pUCrapK was digested with Ndel and Xbal and the insert fragments were isolated and ligated into identically digested pSGset1. The ligation was used to 25 transform E. coli DH10B using standard procedures and the transformants were analysed. Plasmid pSGsetrapK, was isolated and the construct was verified using restricti6n digests and sequence analysis. Example 4. 30 Identification of 9-deoxo-16-O-desmethyl-27-desmethoxy-39-O-desmethyl-rapamycin (pre-rapamycin, Figure 6) 9-deoxo-16-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin (pre rapamycin) was obtained by conjugating the S. hygroscopicus strain MG2-10 as 35 described in Example 1 with pSGsetrapK and isolating the products produced on 99 fermentation. This demonstrates that it is possible to complement the deletion of rapK in the MG2-10 strain and that, if the strain is fed with pipecolic acid, pre rapamycin is produced, an analogue which is lacking the post-PKS modifications. 5 The plasmid pSGsetrapK was conjugated into S. hygroscopicus MG2-10 and the strain grown in TSBGM fed with 2mg/l pipecolic acid at 25 0 C with shaking. The mycelia were extracted with methanol and the culture broth was extracted with ethyl acetate as described previously. Analysis of the culture broth of the pipecolic acid-fed S. hygroscopicus mutant 10 MG2-10[pSGsetrapK] by HPLC with UV detection at 280nm revealed the presence of two major new peaks with retention times of 4.0 and 5.1 minutes. Electrospray mass spectroscopy of these peaks revealed'that both contained ions corresponding to a compound with a MW of 841.5. Neither of these peaks was seen in the culture extractions of the S. hygroscopicus NRRL 5491 strain or the mutant strain MG2-1 0 15 without the rapK expression plasmid pSGsetrapK. MS/MS analysis of the ion with m/z of 864 (corresponding to the sodium adduct of pre-rapamycin) revealed that it fragmented into an ion with m/z of 735 corresponding to the loss of m/z 129 (pipecolic acid), or an ion with m/z of 556 corresponding to the loss of m/z 308 (C28 C42 of pre- rapamycin). This ion itself fragmented further to an ion with m/z 306, 20 corresponding to the loss of m/z 250 (C14 to C27 of pre- rapamycin). This fragmentation pattern was identical to the pattern seen for rapamycin but with the second loss of m/z (-308) reduced by 14, corresponding to the absence of the C39 O-methyl group, the third loss of m/z (-250) reduced by 44, corresponding to the absence of the C27 methoxy and CI 6 0-methyl groups and the final ion (306) having 25 a mass reduced by 14 corresponding to the absence of the C9 ketone group. This was evidence that the compound with MW 841.5 represents 9Edeoxo-16-O desmetlyl-27-desmethoxy-39--desmethyl-rapamycin (pre- rapamycin). Example 5. 30 Preparation of gene cassettes for expression in S. hygroscopicus MG2-1 0 Gene cassettes able to direct the expression of a variety of rapamycin modifying genes and combinations of modifying genes were constructed as described below. 35 100 Cloning of rapN/O The contiguous genes rapN and rapO, hereafter designated rapN/O. were amplified by PCR using the primers BIOSG2 5' GGGCATATGTCGACGACCGATCAGGGTGAGACCGGAAAGGCCTG -3' (SEQ ID 5 NO: 39) and.BIOSG3 5' GGGGTCTAGAGGTCAGTCCTGGGGTTCGAGAAGCTCGCCGGTCTCCTT-3' (SEQ ID NO: 40), which introduce a Ndel site at the 5' end and a Xbal site at the 3' end of rapNIO. Plasmid pR19 (Schwecke et al., 1995) was used as a template. After treatment with T4 polynucleotide kinase using standard techniques the PCR product 10 was ligated Into Smai-cut pUC18 and used to transform E coli DH1OB. The DNA sequence of rapN/O In the isolated plasmid pUCrapN/O was verified by sequence analysis. The differences in the DNA sequence compared to the published sequence (acc. no. X86780) are shown in Fig 21. The resulting changes in RapN are shown in Fig 22. 15 Cloning of rapM The gene rapM was amplified by PCR using the primers BIOSG4 5' GGGCATATGATCCAACCCGACGTCGTGACCGCCTTCACAGCGG -3' (SEQ ID 20 NO: 41) and BIOSG5 5' GGGGTCTAGAGGTCACACGCGGACGGCGATCTGGTGCCGATAGG -3' (SEQ ID NO: 42), which introduce a Ndel site at the 5' end and a Xbal site at the 3' end of rapM. Plasmid pR19 (Schwecke et al., 1995) was used as a template. After treatment with T4 polynucleotide kinase using standard techniques the PCR product was 25 ligated into Smal-cut pUC18 and used to transform E. coli DH10B. The DNA sequenc.e of rapM in the isolated plasmid pUCrapM was verified by sequence analysis. The differences in the DNA sequence compared to the published sequence (acc. no. X86780) are shown in Fig 23. The resulting changes in RapM are shown in Fig 24. 30 Cloning of rapL The gene rapL was amplified by PCR using the primers BIOSG6 5' GGGCATATGCAGACCAAGG1TCTGTGCCAGCGTGACATCAAG -3' (SEQ 1D NO: 43) and BIOSG7 5' 35 GGGGTCTAGAGGTCACTACAGCGAGTACGGATCGAGGACGTCCTCGGGCG -3' 101 (SEQ ID NO: 44), which introduce a Ndel site at the 5' end and a Xbal site at the 3' end of rapL. Plasmid pR19 (Schwecke et al., 1995) was used as a template. After treatment with T4 polynucleotide kinase using standard techniques the PCR product was ligated into Srnal-cut pUC1 8 and used to transform E coli DH1 0B. The DNA 5 sequence of rapL in the isolated plasmid pUCrapL was verified by sequence analysis. The differences in the DNA sequence compared to the published sequence (acc. no. X86780) are shown in Fig 25. The resulting changes in RapL are shown in Fig 26. 10 Cloning of rapLt& The gene rapL was amplified by PCR using the primers BIOSG6 5' GGGCATATGCAGACCAAGGTTCTGTGCCAGCGTGACATCAAG -3' (SEQ ID NO: 43) and BIOSG45 5' GGAGATCTCAGCGAGTACGGATCGAGGACGTCCTCGGGCG -3' (SEQ ID NO: 15 45), which introduce a Ndel site at the 5' end and a Bg/I site at the 3' end of rapL. Plasmid pR19 (Schwecke et al., 1995) was used as a template. After treatment with T4 polynucleotide kinase using.standard techniques the PCR product was ligated into Smal-cut pUC19 and used to transform E. coliDH10B. The DNA sequence of rapL in the isolated plasmid pUC19rapLs was verified by sequence analysis. 20 Cloning of rapK The gene rapK was amplified by PCR using the primers BIOSG8 5' GGGCATATGAGGCAATTGACTCCGCCGGTCACGGCACCGTACTGCC -3' (SEQ ID NO: 37) and BIOSG9 5' 25 GGGGTCTAGAGGTCACGCCACCACACCCTCGATCTCGACC -3' (SEQ ID NO: 38), which introduce a Ndel site at the 5' end and a Xbal site at the:3' end of rapK. PlasmidpR19 (Schwecke et al., 1995) was used as a template. After treatment with T4 polynucleotide kinase using standard techniques the PCR product was ligated with Smal-cut pUC1 8 and used to transform E. coli DH1 0B. The DNA sequence of 30 rapK in the isolated plasmid pUCrapK was verified by sequence analysis. The differences in the DNA sequence compared to the published sequence (acc. no. X86780) are shown in Fig 27. The resulting changes in RapK are shown Fig 28. Isolation of pSGsetrpaN/O, pSGsetrapJ, pSGsetrapM, pSGsetrapQ, pSGsetrapl, 35 pSGsetrapK, and pSGsetrapL 102 Plasmids pUCrapN/O, pUCrapJ, pUCrapM, pUCrapi, pUCrapL, pUCrapK and pAHL42 were digested with Ndel and Xbal and the insert fragments, ranging in size from about 1.3 kb to 0.7 kb, were isolated and ligated into identically digested pSGsetl. The ligations were used to transform E coli DH10B using standard 5 procedures and the transformants were analysed. Plasmids pSGsetrapN/O, pSGsetrapJ, pSGsetrapM, pSGsetrapQ, pSGsetrapl, pSGsetrapK, and pSGsetrapL were isolated and the constructs were verified using restriction digests and sequence analysis. 10 Cloning of rapJ The gene rapJ was amplified by PCR using the primers BIOSG10 5' GGGCATATGAGCACCGAAGCTCAGCAAGAGAGCACGCCCACCGCACGCT-3' (SEQ ID NO: 46) and BIOSGI1 5' GGGGTCTAGAGGTCACTCCGCTCCCCAGGTGACCCGGAGCTCGGC -3' (SEQ ID 15 NO: 47), which introduce a Ndel site at the 5' end and a Xbal site at the 3' end of rapJ. Plasmid pR19 (Schwecke et al., 1995) was used as a template. After treatment with T4 polynucleotide kinase using standard techniques the PCR product was ligated with Smal-cut pUC18 and used to transform E. co/i DHI1B. The DNA sequence of rapJ in the isolated plasmid pUCrapJ was verified by sequence analysis. 20 The differences in the DNA sequence compared to the published sequence (acc. no. X86780) are shown in Fig 29. The resulting changes in RapJ are shown in Fig 30. Cloning of rapid The gene rapt was amplified by PCR using the primers BIOSG12 5' 25 GGGCATATGAGCGCGTCCGTGCAGACCATCAAGCTGCC -3' (SEQ ID NO: 48) and BIQSG1 3 5'-GGGGTCTAGAGGTCAGGCGTCCCCGCGGCGGGCGACGACCT.. -3' (SEQ ID NO: 49), which introduce a Ndel site at the 5' end and a Xbal site at the 3' end of rapt. Plasmid pAHL2 (kindly provided by Huai-Lo Lee) is derived from. pUC1 8 containing the rapt gene and was used as a template. After treatment with T4 30 polynucleotide kinase using standard techniques the PCR product was ligated with Smal-cut pUC1 8 and used to transform E. coli DH101B. The DNA sequence of rapt In the isolated plasmid pUCrapl was verified by sequence analysis. The differences in the DNA sequence compared to the published sequence (acc. no. X86780) are shown in Fig 31. The resulting changes in RapI are shown in Fig 32. 35 103 Cloning of rapQ The gene rapQ was amplified by PCR using the primers AHL21 5' CATATGTTGGAATTGGGTACCCGCCTG -3' (SEQ ID NO: 50) and AHL22 5' TCTAGACGCTCACGCCTCCAGGGTG -3' (SEQ iD NO: 51), which introduce a Ndel 5 site at the 5' end and a Xbal site at the 3' end of rapQ..Plasmid pR19 (Schwecke et al., 1995) was used as a template. After treatment with T4 polynucleotide kinase using standard techniques the PCR product was ligated with Smal-cut pUC1 8 and used to transform E. coli DH1 OB. The DNA sequence of rapQ in the isolated plasmid pAHL42 was verified by sequence analysis. The differences in the DNA sequence 10 compared to the published sequence (acc. no. X86780) are shown in Fig 33. The resulting changes in RapQ are shown in Fig 34. Isolation of pUC18eryBVcas The gene eiyBV was amplified by PCR using the primers casOleG21 15 (WO1/79520) and 7966 5' GGGGAATTCAGATCTGGTCTAGAGGTCAGCCGGCGTGGCGGCGCGTG AGTTCCTCCAGTCGCGGGACGATCT -3' (SEQ ID NO: 52) and pSGI42 (Gaisser et al., 2000) as template. The PCR fragment was cloned using standard procedures and plasmid pUC1 8eryBVcas was isolated with an Ndel site overlapping the start 20 codon of eryBV and an Xbal and BgII site following the stop codon. The construct was verified by sequence analysis. Isolation of vector pSGLit1 The gene etyBV was amplified by PCR using the primers BIOSG1 5' 25 GGGTCTAGATCCGGACGAACGCATCGATTAATTAAGGAGGACACATA -3' (SEQ ID NO: 53) and 7966 5' GGGGAATrCAGATCTGGTCTAGAGGTCAGCCGGCGTGGCGGCGCGTGAGTTC CTCCAGTCGCGGGACGATCT -3' (SEQ ID NO: 52), which introduce a Xbal site sensitive to Dam methylation at the 5' end and a Xbal site and a Bgll site at 3' end of 30 eryBV. Plasmid pUC18eryBVcas was used as a template. After treatment with T4 polynucleotide kinase using standard techniques the PCR product was ligated with Smal-cut pUC18 and used to transform E. coli DH1OB. The construct was then digested using BamHlIBgl and an about 1.3 kb DNA band was isolated from an agarose gel followed by the ligation with BamHI/Bgll digested Litmus 28 vector DNA 104 using standard procedures. The vector pSGLit1 was isolated and the DNA sequence of the insert was verified by-sequence analysis. Isolation of pSGsetrpaN/O, pSGsetrapJ, pSGsetrapM, pSGsetrapQ, pSGsetrapl, 5 pSGsetrapK, and pSGsetrapL Plasmids pUCrapN/O, pUCrapJ, pUCrapM, pUCrapl, pUCrapL, pUCrapK and pAHL42 were digested with Ndel and Xbal and the insert fragments ranging in size from about 1.3 kb to 0.7 kb were isolated and ligated into identically digested pSGsetl. The ligations were used to transform E. coliDH1OB using standard 10 procedures and the transformants were analysed. Plasmids pSGsetrapN/O, pSGsetrapJ, pSGsetrapM, pSGsetrapQ, pSGsetrapl, pSGsetrapK, and pSGsetrapL were isolated and the constructs were verified using restriction digests and sequence analysis. 15 Isolation of pSGLitrapN/O, pSGLitrapJ, pSGLitrapM, pSGLitrapQ, pSGlitrapl, pSGLitrapK, pSGLftrapL and pSGltrapLI 3 Plasmids pSGsetrpaN/O, pSGsetrapJ, pSGsetrapM, pSGsetrapQ, pSGsetrapl, pSGsetrapK, pSGsetrapL, and pUCI 9rapLs, were digested using NdellBgll restriction enzymes and the bands ranging from about 0.7 to 1.3 kb were 20 isolated followed by ligations with pSGUt1 digested with Ndel/Bg/l. The ligations were used to transform E. coli ETI 2567 and the transformants were analysed. Plasmids pSGLitrapN/O, pSGLitrapJ, pSGLitrapM, pSGUtrapQ, pSGLitrapl, pSGLitrapK, pSGLitrapL and pSGLitrapLt were isolated. 25 Isolation of plasmids pSGsetrapKI, pSGsetrapKM, pSGsetrapKN/O, pSGsetrapKL, pSGsetrapKQ and pSGrapKJ = The plasmids pSGUtrapN/O, pSGLitrapJ, pSGLitrapM, pSGLitrapQ, pSGLitrapl, and pSGLitrapL were digested using Xbal and the fragments ranging from about 0.8 to 1.3 kb were isolated followed by ligations with pSGsetrapK. 30 digested with Xbal and treated with alkaline phosphatase using standard molecular biological techniques. The ligations were used to transform E. coli DH1OB and the transformants were analysed. Plasmids pSGsetrapKI, pSGsetrapKM, pSGsetrapKN/O, pSGsetrapKL, pSGsetrapKQ and pSGrapKJ were isolated and the orientation of the Insert was verified by restriction digest analysis. For the addition of 35 rapL, these constructs were either digested with Bgll/Xbal followed by partial digest 105 with BgIll as appropriate and the isolated vector fragments were ligated with the Ikb Xbal/BgIll fragment of pSGLitrapL. Isolation of plasmids pSGsetrapKJ, pSGsetrapKIM and pSGsetrapKlQ 5 The plasmids pSGLitrapJ, pSGLitrapM, and pSGLitrapQ were digested using Xbal and the fragments ranging from about 0.8 to 1.3 were isolated followed by ligations with pSGsetrapKI digested with Xbal and treated with alkaline phosphatase using standard molecular biological techniques. The ligations were used to transform E. coli DHIOB and the transformants were analysed. Plasmids pSGsetrapKIJ, 10 pSGsetrapKIM, and pSGrapKlQ were isolated and the orientation of the insert was verified by restriction digest analysis. For the addition of rapLhi these constructs were either digested with Bglll/Xbal followed by partial digest with Bgll as appropriate and the isolated vector fragments were ligated with the - 1kb Xbal/Bgll fragment of pSGLitrapLis. 15 Isolation of plasmids pSGsetrapKN/Ol, pSGsetrapKN/OQ, pSGsetrapKN/OM and pSGsetrapKN/OJ. The plasmids pSGLitrapl, pSGLitrapM, pSGLitrapJ, and pSGLitrapQ were digested using Xbal and the fragments ranging from about 0.8 to 1.3 were isolated 20 followed by ligations with pSGsetrapKN/O digested with Xbal and treated with alkaline phosphatase using standard molecular biological techniques. The ligations were used to transform E coli DHI OB and the transformants were analysed. Plasmids pSGsetrapKN/Ol, pSGsetrapKN/OQ, pSGsetrapKN/OM and pSGrapKN/OJ were isolated and the orientation of the insert was verified by restriction digest 25 analysis. For the addition of rapL these constructs were either digested with BgllI/Xbal followed by partial digest with BglIl as appropriate and the isolated vector fragments were ligated with the - 1kb XbaVBgllI fragment of pSGLitrapLs. Isolation of plasmids pSGsetrapKJM and pSGsetrapKJQ 30 The plasmids pSGLitrapM and pSGLitrapQ were digested using Xbal and the fragments ranging from about 0.8 to 1.1 were isolated followed by a ligation with pSGsetrapKJ digested with Xbal and treated with alkaline phosphatase using standard molecular biological techniques. The ligations were used to transform E coli DHIOB and the transformants were analysed. Plasmids pSGsetrapKJM and 35 pSGrapKJQ were Isolated and the orientation of the insert was verified by restriction 106 digest analysis. For the addition of rapLhs these constructs were either digested with BglIl/Xbal followed by partial digest with Bglll as appropriate and the isolated vector fragments were ligated with the - 1kb Xbal/Bgill fragment of pSGLtrapLmS. 5 Using the same strategy outlined above, the following gene cassettes were isolated: pSGsetrapKIJM pSGsetrapKN/OJI pSGsetrapKQN/OM pSGsetrapKlJQ pSGsetrapKJMN/O pSGsetrapKJMN/OQ pSGsetrapKiJN/O pSGsetrapKJQN/O pSGsetrapKIJN/OMQ pSGsetrapKIMN/O pSGsetrapKJN/OM pSGsetrapN/OQ 10 pSGsetrapKlQN/O pSGsetrapKIJN/OQ pSGsetrapKJMN/OQ pSGsetrapKN/OMQ pSGsetrapKlMN/OQ An overview is given in Figure 5. For the addition of rapLs, these cassette constructs were either digested with Bg/ll/Xbal or with Xbal followed by partial digest with Bg/ll as appropriate and the is isolated vector fragments were ligated with the about I kb Xbal/Bgill fragment of pSGLitrapLt". Example 6 Isolation of 9-deoxo-1 6-O-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin 20 (pre-rapamycin, Figure 6) 9-Deoxo-16-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin (pre rapamycin) was obtained by conjugating the S. hygroscopicus strain MG2-10 with pSGsetrapKL and isolating the products generated as described below.. This 25 demonstrates that it is possible to complement the deletion of rapK and rapL in the MG2-1Qstrain and that pre-rapamycin is produced, an analogue which is lacking post-PKS modification. The feeding of pipecolic acid is not required when rapL is complemented confirming that rapL plays a role in the provision of pipecolic acid in the production of rapamycin. 30 S. hygroscopicus MG2-10[pSGsetrapKL] was cultured from a frozen working spore stock in cryopreservative (20% glycerol, 10% lactose w/v in distilled water) on Medium 1 (see Materials and Methods) and spores were harvested after 14 days 35 growth at 29 0 C. A primary pre-culture was inoculated with the harvested spores and cultured in two 250 ml Erlenmeyer flasks containing 50 ml Medium 3 (see Materials 107 and Methods), shaken at 250 rpm with a two-inch throw, at 30*C, for two days. The primary pre-culture was used to inoculate two secondary pre-cultures of Medium 2 (see Materials and Methods) and Medium 3, at 10% v/v, which was shaken at 300 rpm with a one-inch throw, at 25 0 C, for a further 24h. Four litres of Medium 4 (see 5 Materials and Methods) and Medium 5 (see Materials and Methods) were prepared containing 0.01% v/v Pluronic L101 antifoam (BASF). Production Medium 4 was Inoculated with the secondary pre-culture in Medium 2 and Production Medium 5 was inoculated with the secondary pre-culture in Medium 3 at 10% v/v and allowed to ferment in a 7 L stirred bioreactor for five to seven days at 25"C. Airflow was set to 10 0.75 vvm and the impeller tip speed was controlled between 0.98 ms ' ahd 2.67 ms". Additional Pluronic L101 was added on demand. To confirm the structure of 9-deoxo-1 6-0-desmethyl-27-desmethoxy-39-0 desmethyl-rapamycin (pre-rapamycin), broths from Medium 4 and Medium 5 were extracted with ethyl acetate and reduced to a crude extract by evaporation. The 15 extracts were defatted on partition with hexane:methanol:water and flashed through a 70 g silica cartridge starting with hexane and finishing with acetone. Pre-rapamycin fractions from each fermentation were pooled and flashed through a C18 cartridge starting with water and finishing with methanol. Pre-rapamycin (8.5 mg) was Isolated after chromatography on Sephadex LH 2 0 using heptane:chloroform:ethanol as the 20 mobile phase. This compound was analysed and the structure fully confirmed by NMR (Figure 18-20). The 'H and "3C NMR data are given in Table V below. Table V: 'H and 1 3 C NMR data for pre-rapamycin Position Su multiplicity coupling Sc 1 171.8 2.. 5.49- 52.7 3 1.76 25.9 3b 2.21 4a 1.21 20.9 4b 1.75 5a 1.47 25.0 5b 1.74 6a 3.27 45.1 6b 3.87 br. d 12.8 8 171.6 9a 2.46 d 12.8 41.4 9b 3.23 d 12.8 108 Position SI. multiplicity coupling SC 10 98.9 11 1.60 38.1 12a 1.52 27.6 12b 1.

65 t 13a 1.38 31.6 13b 1.53 14 4.00 71.5 15a 1.48 40.6 15b 1.70 16 3.95 br. d 8.1 75.5 17 139.2 18 6.39 122.6 19 6.33 128.1 20 6.17 dd 14.3,10.7 131.4 21 6.04 130.9 22 5.26 138.1 23 2.21 37.2 24a 1.26 39.8 24b 1.64 25 2.30 45.8 26 215.3 27a 2.42 dd 15.1, 4.7 44.8 27b 2.89 dd 15.1, 5.8 28 4.32 dd 5.5, 4.9 71.4 29 138.6 30 5.26 123.7 31 3.20 45.5 32 208.2 33a 2.58 dd 18.1, 4.3 41.5 33b 2.78 dd 18.1, 9.6 34 5.18 76.0 35 1.72 31.9 36a 1.00 37.3 36b 1.07 37 1.30 33.1 38a Ax. 0.62 ddd 11.9, 11.9, 38.2 11.9 38b eq. 1.83 39 3.24 74.9 tAssignment tentative 109 Position am multiplicity coupling Sc 40 3.25 75.9 41a 1.28 31.5 41b 1.94 42a 0.98 32.2 42b 1.61 43 0.98 d 6.6 16.5 44 1.61 s 14.1 45 1.04 d 6.8 21.3 46 0.95 d 6.8 15.2 47 1.66 d 0.9 14.1 48 0.99 d 6.8 15.7 49 0.89 d 6.6 17.4 Example 7 5 Isolation of 8-deoxo-15-O-desmethyl-26-desmethoxy-38-0-desmethyl prolyrapamycin (pre- prolylrapamycin, Figure 7) Feeding of S. hygroscopicus MG2-1 0[pSEGrapK] with praline acid resulted in the production pre-prolylrapamycin as described below. This demonstrated that in 10 the absence of rapL alternative pipecolic acid analogues are incorporated. S. hygroscopicus MG2-10[pSGsetrapK] was grown in TSBGM fed with Img/i praline at 25 0 C with shaking. The mycelia were extracted with methanol and the culture broth was extracted with ethyl acetate as described previously. 15 Analysis of the culture broth of the proline-fed S. hygroscopicus mutant MG2 1 0[pSGsetrapKJ by HPLC with UV detection at 280nm revealed the presence of two major new peaks with retention times of 4.5 and 4.6 minutes. Electrospray mass spectroscopy of these peaks revealed that both contained ions corresponding to a compound with a MW of 827.5. Neither of these peaks were seen in the cultures of 20 S. hygroscopicus NRRL 5491, S. hygroscopicus MG1 C or S. hygroscopicus MG2-1 0 without the rapK expression plasmid pSGsetrapK. MS/MS analysis of the ion with * m/z of 850 (corresponding to the sodium adduct of pre-prolylrapamycin) revealed that it fragmented Into an ion with m/z of 735 corresponding to the loss of m/z 115 (proline), or an ion with m/z of 542 corresponding to the loss of m/z 308 (C27-C41 of 25 pre-prolylrapamycin). This ion itself fragmented further to an ion with m/z 292, 110 corresponding to the loss of m/z 250 (C13 to C26 of pre-prolylrapamycin). This fragmentation pattern was identical to the pattern seen for rapamycin but with the first loss of m/z (-115) reduced by 14 corresponding to the change from pipecolic acid to proline for the amino acid, the second loss of m/z (-308) reduced by 14, 5 corresponding to the absence of the C38 0-methyl group, the third loss of m/z (-250) reduced by 44, corresponding to the absence of the C26 methoxy and C1 5 0-methyl groups and the final ion (306) having a mass reduced by 14 corresponding to the absence of the C8 ketone group and the change from pipecolic acid to proline. This was evidence that the compound with MW of 827.5 represents 8-deoxo-15-O 10 desmethyl-26-desmethoxy-38-0-desmethyl-prolylrapamycin (pre-prolylrapamycin). Example 8 Isolation of 9-deoxo-16-0-desmethyl-27-desmethoxy-39-desmethoxy-rapamycin (39 dehydroxy pre- rapamycin, Figure 8) 15 Feeding of S. hygroscopicus MG2-10[pSGsetrapK] with pipecolic acid and cyclohexane carboxylic acid resulted in the production of two major compounds, pre rapamycin which corresponds to the incorporation of the natural starter unit and 39 dehydroxy pre-rapamycin, which corresponds to the incorporation of the fed starter 20 unit. S. hygroscopicus MG2-1 0[pSGsetrapK] was grown in TSBGM fed with 2mg/I pipecolic acid and 1mM cyclohexane carboxylic acid at 25 0 C with shaking. The culture broth was extracted with ethyl acetate as described previously. 25 Analysis of the culture broth of the cyclohexane carboxylic acid-fed S. hygrmscopicus mutant MG2-10[pSGsetrapK] by HPLC with UV detection at 280nm revealed the presence of one major new peak with a retention time of 5.8 minutes. Electrospray mass spectroscopy of this peak revealed that it contained ions corresponding to a compound with a MW of 825.5. This peak was not seen in the 30 cultures of S. hygroscopicus NRRL5491, S. hygroscopicus MG1C or S. hygroscopicus MG2-1 0 without the rapK expression plasmid pSGsetrapK. MS/MS analysis of the Ion with m/z of 848 (corresponding to the sodium adduct of 39 dehydroxy pre-rapamycin) revealed that it fragmented into an ion with m/z of 719 corresponding to the loss of m/z 129 (pipecolic acid), or an ion with m/z of 556 35 corresponding to the loss of m/z 292 (C28-C42 of 39-dehydroxy pre-rapamycin). This 111 ion itself fragmented further to an ion with m/z 306, corresponding to the loss of m/z 250 (C14 to C27 of 39-dehydroxy pre-rapamycin). This fragmentation pattern was identical to the pattern seen for pre- rapamycin but with the second loss of miz (-292) reduced by 16, corresponding to the absence of the C39 hydroxy group. This was 5 evidence that the compound with MW 825.5 represents 9-deoxo-16-0-desmethyl-27 desmethoxy-39-desmethoxy-rapamycin (39-dehydroxy-pre-rapamycin). Example 9 Isolation of 16-O-desmethyl-27-desmethoxy-rapamycin (Figure 9) 10 The S hygroscopicus strain MG2-10 was conjugated with pSGsetrapKIJ as described in Example 1. Feeding of this strain with pipecolic acid and isolation of the products produced on fermentation resulted in the production of 16-O-desmethyl-27 desmethoxy-rapamycin. 15 The plasmid pSGsetrapKIJ (Figure 5) was conjugated into S. hygroscopicus MG2-10 and the strain grown in-TSB GM fed with 2mg/l pipecolic acid at 25 0 C with shaking. The mycelia were extracted with methanol and the culture broth extracted with ethyl acetate as described previously. 20 Analysis of the extracts of the S. hygroscopicus mutant MG2 10[pSGsetrapKIJ] by electrospray mass spectroscopy revealed one major new peak of retention time 4.3 minutes which contained ions corresponding to a compound with a MW of 869. This peak was not seen in the cultures of S. hygroscopicus NRRL 5491, S. hygroscopicus MG1 C S. hygroscopicus MG2-1 0 with or without the rapK 25 expression plasmid pSGsetrapK. MS/MS analysis of the ion with m/z of 892 (corresponding to the sodium adduct of 16-0-desmethyl-27-ddsmethoxy-rapamycin) revealed that it fragmented into an ion with m/z of 763 corresponding to the loss of m/z 129 (pipecolic acid), or an ion with m/z of 570 corresponding to the loss of m/z 322 (C28-C42 of 16-O-desmethyl-27-desmethoxy-rapamycin). This ion itself 30 fragmented further to an ion with m/z 320, corresponding to the loss of m/z 250 (C14 to C27 of 16-O-desmethyl-27-desmethoxy-rapamycin). This fragmentation pattern was identical to the pattern seen for rapamycin but with the third loss of m/z (-250) reduced by 44, corresponding to the absence of the C16 methyl and C27 methoxy groups. This was evidence that the compound with MW 869 was 16-O-desmethyl-27 35 desmethoxy-rapamycin. 112 Example 10 Array feeding S. hygroscopicus MG2-10[pSGsetrapKl] was used to carry out an array 5 feeding. Primary vegetative cultures were prepared by innocculating medium with spore stock as described in the Materials and Methods. TSB GM medium was inoculated at 10% v/v using methods described in the materials and methods section. The following compounds were added as Indicated in Table Vi below Table VI: cyclohexane cyclohex-1-ene cycloheptane carboxylic acid carboxylic acid carboxylic acid (1 MM) (1 MM) (1 MM) L-lysine (25.3mM) X X X L-proline (44.7mM) X X X DL-pipecolinic acid (39.8mM) X X X trans-4-hydroxy proline X X X (13mM) cis-4-hydroxy proline (0.2mM) X X X 10 The cultures were incubated, extracted and measured using techniques described in the Material and Method section. Table VII shows the results of the analysis showing the ion (miz) observed for each combination of starter carboxylic acid and amino acid: 15 Table VII cyclohexane cyclohex-1-one cycloheptane carboxylic acid carboxylic acid carboxylic acid L-lysine 848.5 848.5 862.4 L-proline 834.5 834.5 848.5 DL-pipewolinic acid 848.5 848.5 .862.4 trans-4-hydroxy praline 850.5 850.5 864.5 cis-4-hydroxy praline 850.5 n.a. 864.5 These data demonstrate incorporation of the fed compounds. Example 11 20 Complementation of S.hygroscopicus MG2-10 with fkbO To assess whether rapK homologous genes such as fkbO in S.hygroscopicus var. ascomyceticus and S.tsukubaensls, and orf5 in the partially sequenced 'hyg' 113 cluster (Ruan et al., 1997) fulfil similar functions, complementation assays were carried out using fkbO as described below. Isolation of pMG169-1 5 The gene fkbO from Strepomyces hygroscopicus var. ascomyceticus (ATCC 14891), an FK520 producer, was amplified by PCR using the primers fkbof 5' GGGCATATGACCGATGCCGGACGCCA 3' (SEQ ID NO: 54) and fkbor 5' GGGGTCTAGATCACGCCACCATGCCTTCGA 3' (SEQ ID NO: 55), introducing a Ndel site at the 5'end and a Xbal site at the 3'end of 1kbO. Genomic DNA isolated 10 from S.hygroscopicus var. ascoinyceticus (ATCC 14891) was used as a template. The amplified PCR product was subjected to digestion with Ndel and Xbal and ligated with Ndel-Xbal cut pSGsetl. The ligation was used to transform E.coli DH1 0B and the transformants were analysed using methods described in the Materials and Methods section. Plasmid pMG169-1 was isolated and verified by restriction 15 digestion and S.hygroscopicus MG2-10 was transformed using methods described in the Materials and Methods section. Heterlogous complementation of rapK by fkbO S.hygroscopicus MG2-10[pMG169-1] was grown in TSBGM fed with 2mg/ 20 pipecolic acid at 25 0 C with shaking. The culture broth and mycelia were extracted using methods described in the Materials and Methods section (Method A). Analysis of the extract with UV detection at 280nm revealed the presence of two major new peaks with retention times of 4.5 and 4.6 minutes. Electrospray mass spectroscopy of these peaks revealed that both contained ions with a MW of 827.5 corresponding 25 to two Isomers of pre-rapamycin (Example 7). Example 12 Efficient production of 9-deoxo-1 6-O-desmethyl-27-desmethoxy-39-desmethoxy rapamycin (39-dehyroxy pre-rapamycin, Figure 8) in the absence of competition by 30 endogenous starter unit by feeding to a rapK knockout mutant The ability of S. hygroscopicus strains MG2-10 and MG2-10[pSGsetrapK] to incorporate a different starter unit, cyclohexane carboxylic acid, was compared as described below. When fed cyclohexane carboxylic acid and pipecolic acid MG2 10 35 produced only one compound (39-dehydroxy pre-rapamycin) corresponding to 114 incorporation of the fed starter unit only, whereas MG2-10[pSGsetrapK] produced two compounds in a 1:1 ratio, 39-dehydroxy pre-rapamycin and pre-rapamycin. This demonstrated that rapK is required for the incorporation of the natural endogenous starter unit and a rapK knock-out strain had no competition of the endogenous starter 5 unit with the fed starter unit. S. hygroscopicus MG2-1 0 was grown on TSBGM fed with 2 mg/L pipecolic acid and 1 mM cyclohexane carboxylic acid at 25 0 C with shaking. The culture broth was extracted with ethyl acetate as described previously. Analysis of the extracts by 10 HPLC with UV detection at 280 nm revealed the presence of one new major peak with a retention time of 5.8 min. However, S. hygroscopicus MG2-1 0[pSGsetrapK] (Example 4), produced pre-rapamycin (Figure 6) in addition to 39-dehydroxy pre rapamycin in a ratio of -1:1 when fed with cyclohexane carboxylic acid (Example 8, Figure 8). Surprisingly, feeding of cyclohexane carboxylic acid to S. hygroscopicus 15 MG2-10 resulted in a single product, 39-dehydroxy pre-rapamycin. The endogenous starter, 4,5-dihydroxycyclohex-1-ene carboxylic acid, was not incorporated in the absence of rapK. There was therefore no competition between the incorporation of the fed carboxylic acid and the endogenous starter. 20 Example 13 Elucidation of the function of RapM Cultures of Streptomyces lividans TK24, S. lividans TK24[pSGsetrapM] and S. ividans TK24[pSGsetrapQ] were grown in TSBGM with shaking at 30"C and fed with 20 pg/ml of pre-rapamycin. Controls remained unfed. After a further 5 days 25 incubation, the cultures were extracted with ethylacetate and brought to dryness. Reconstitution and analysis by LC-MS identified no production of rapamycin analogues in the unfed controls. Two major new peaks were identified in the extract of S. lividans TK24[pSGsetrapM] fed pre-rapamycin, one at 2.5 min and one at 7.9 min. Electrospray mass spectroscopy of these peaks revealed that both contained 30 ions corresponding to a compound with a MW of 855.6, consistent with 9-deoxo-16 O-methyl-27-desmethoxy-39-O-desmethy-rapamycin (16-0-methyl-pre-rapamycin). Two isomers were commonly observed when extracts were analysed by LC-MS in the absence of TFA. No new peaks were identified in the extracts of S. /ividans TK24 or S. lividans TK24[pSGsetrapQ]. Unmodified pre-rapamycin was clearly evident. 115 -RapM was clearly responsible for methylation at the C16 hydroxyl, RapQ was not specific for this site. Example 14 5 Elucidation of the function of RapJ Cultures of S. lividans TK24, S. lividans TK24[pSGsetrapK], S. lividans TK24[pSGsetrapJ] and S. lividans TK24[pSGsetrapKJ] were grown in TSBGM with shaking at 30 0 C and fed with 40 pg/ml of pre-rapamycin. Controls remained unfed. After a further 5 days incubation, the cultures were extracted with ethylacetate and 10 brought to dryness. Reconstitution and analysis by LC-MS identified no production of rapamycin analogues in the unfed controls. One major new peak at 4.9 min was identified in the extracts of S. lividans TK24[pSGsetrapKJ] and S. fividans TK24[pSGsetrapJ] fed pre-rapamycin. Electrospray mass spectroscopy of this peak revealed that it contained ions corresponding to a compound with a MW of 855.5, 15 consistent with 16-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin (C9 oxo pre-rapamycin). In extracts of S. lividans TK24 and S. ividans TK24[pSGsetrapK] fed with pre-rapamycin, no new peaks were identified. Unmodified pre-rapamycin was clearly evident. Due to the homology of RapJ with FkbD of the FK506 and FK520 cluster, 20 RapJ has been postulated to oxidise pre-rapamycin at C9 to 9-hydroxy-16-0 desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin (C9 OH-pre-rapamycin). RapK has been postulated to be responsible for the further conversion to the ketone. Surprisingly, in the presence of RapJ, but in the absence of RapK, 16-0-desmethyl 27-desmethoxy-39-O-desmethyl-rapamycin (C9 keto-pre-rapamycin) was formed. 25 RapJ clearly has an oxidative function at C9, complete conversion to the ketone was observed. RapK does not have an oxidative function at C9. Example 15 Plasmids containing the following combinations of rapamycin modifying genes 30 were constructed as described below: pMG260 (rapl, rapJ, rapN, rapO, and rapL), pMG261 (rapl, rapJ, rapN, rapO, rapM and rapL), pMG262 (rapl, rapJ, rapN, rapO,. rapM, rapQ and rapL) pMG236 (rapN, rapO, rapQ and rapL) and pMG238 (rapJ and rapL). 35 Isolation of plasmids pMG236 and pMG238 - 116 The plasmids pSGsetrapNOQ and pSGsetrapJ were digested using Bgill/Xbal and the isolated vector fragments were ligated with the 1kb Xbal/Bglll fragment of pSGLitrapLi,. Plasmids pMG236 (expressing rapN, rapO, rapQ and rapL) and pMG238 (expressing rapJ and rapL) respectively, were isolated. 5 Isolation of plasmids pMG260, pMG261 and pMG262 The plasmids pSGSetrapKIJNOL, pSGSetrapKIJMNOL, and pSGSetrapKIJMNOQL were digested using Bglll and the isolated insert fragments (containing the rapamycin cluster genes from the Bglll site in rapl to the Bglll site after rapL) were ligated with io the vector-containing fragment from pSGSetrapl digested with Bgill. Plasmids pMG260 (expressing rapl, rapJ, rapN, rapO, and rapL), pMG261 (expressing rapid, rapJ, rapN, rapO, rapM and rapL), and pMG262 (expressing rapl, rapJ, rapN, rapO, rapM, rapQ and rapL) were isolated. 15 Example 16 An S.hygroscopicus mutant (MG3) carrying the chromosomal deletion of rapK was constructed -as described below. Heterologous complementation of rapK with fkbO can then be performed as described and will result in the restoration of rapamycin production demonstrating that fkbO is able to complement the function of 20 rapK in S. hygroscopicus. Isolation of the S.hygmscopicus mutant MG3 canying the chromosomal deletion of rapK The primers RAPKF1 5'-CAAAGCTTCCTGGCGCGGTTCGGCCGGCA- 3 ' 25 (SEQ ID NO: 56) and RAPKF2 5'-TGGCATGCCCTTCCCCGCCGTTCCCTGGC- 3 ' (SEQ ID.NO: 57) were used to amplify the left region of homolbgy outside the gene rapK (frbm nt94403 to nt95429 in the rapamycin cluster as described in Schwecke et al., 1995) using genomic DNA prepared from S.hygroscopicus NRRL5491 as a template. The 1kb PCR product was phosphorylated using T4 polynucleotide kinase 30 and ligated into dephosphorylated Smal cut pUCI 8. After transformation into EcoIl DH10B, the plasmid pMG233-7 was isolated. The primers RAPKR1 5' TGGCATGCCCCCGCCGAGCTGACCTGGAA-3' (SEQ ID NO: 58) and RAPKR2 5' GTTCTAGAGCTTACGCGTGATGTCGAACG-3' (SEQ ID NO: 59) were used to amplify the right region of homology outside the gene rapK (from nt96435 to nt97428 35 in the rapamycin cluster as described in Schwecke et al., 1995) using genomic DNA 117 prepared from S.hygroscopicus NRRL5491 as a template. The 1kb PCR product was phosphorylated using T4 polynucleotide kinase and ligated into dephosphorylated Small cut pUC18. After transformation into E.coi DH10B, the plasmid pMG257-7 was isolated. Both plasmids were checked by sequence analysis. The plasmid pMG233-7 5 was digested with SphI/Xbal and the 3.7kb fragment was isolated, pMG257-7 was digested with SphI/Xbal and the 1kb fragment isolated. These fragments were ligated and used to transform E.coli DH1OB. The plasmid pMG268-12 was isolated. This plasmid was digested with Hindlll/Xbal and the 2kb fragment Isolated and ligated Into pMG55 cut with Hindill/Xbal and the DNA was used to transform E.coli DHI 0. The 10 plasmid pMG278-1 was isolated and used to conjugate S.hygroscopicus MG1C. An apramycin resistant colony is isolated, and is grown for 24 hours in TSBGM with shaking at 300C and spread onto medium I agar plates containing 50ug/l streptomycin. Streptomycin resistant colonies are isolated and shown to be apramycin sensitive. The 1004nt chromosomal deletion of rapK can be verified in the 15 mutant MG3 by Southern blotting. An overview is given in Figure 35. S.hygroscopicus MG3 is grown in TSBGM at 260C with shaking. The culture broth and mycelia are extracted using methods as described in the Materials and Methods section. Analysis of the extract with UV detection reveals the presence of no peaks with the characteristic rapamycin triene. 20 Expression of fkbO in the S.hygroscopicus mutant MG3 carrying the chromosomal deletion of rapK Plasmid pMG169-1 (described in example 11) is transformed into 25 S.hygroscopicus mutant MG3 using methods as described in the Materials and Methods section. Heterologous complementation of rapK by fkbO S.hygoscopicus MG3pMG169-1 is grown in TSBGM at 260C with shaking. 30 The culture broth and mycelia arere extracted using methods as described in the Materials and Methods section. Analysis of the extract with UV detection at 280nm. reveals the presence of two major new peaks. Electrospray mass spectroscopy of these peaks reveals that these contain Ions with a MW of 913 corresponding to rapamycin. 35 118 Example 17 Isolation and heterologous complementation of the S. hygroscopicus var ascomyceticus mutant MG4 canying the chromosomal deletion of fkbO 5 Isolation af the S.hygroscopicus var ascomyceticus mutant MG4 carrying the chromosomal deletion of fkbO The primers FKOF1 5'-GCTCTAGAGCCCGCGGCTCGCCGGACACG-3' (SEQ ID NO: 60) and FKOF2 5'-CCCCTGCAGGCGTCCGGCATCGGTCATCAG-3' (SEQ ID NO: 61) were used to amplify the left region of homology (from nt45750 to 10 nt46751 In the ascomycin cluster as described in Wu et al., 2000) using genomic DNA prepared from S.hygroscopicus varascomyceticusATCC14891 as a template. The Ikb PCR product was phosphorylated using T4 polynucleotide kinase and ligated into dephosphorylated Smal cut pUC1 8. After transformation into E.coli. DHIOB, the plasmid pMG258-4 was isolated. The primers FKORl 5' 15 CGCCTGCAGGGATACGGTCCGCCGGGTCTGC-3' (SEQ ID NO: 62) and FKOR2 5'-CCAAGCTTGTACGGTTCGCCACGGGCGTGC-3' (SEQ ID NO: 63) were used to amplify the right region of homology.(from nt47785to. nt48781 in the rapamycin cluster as described in Wu et al., 2000) using genomic DNA prepared from S.hygroscopicus var ascomyceticus ATCC14891 as a template. The 1kb PCR 20 product was phosphorylated using T4 polynucleotide kinase and ligated into dephosphorylated Smal cut pUC18. After transformation into E.coli DH10B, the plasmid pMG259-5 was isolated. Both plasmids were checked by sequence analysis. The plasmid pMG258-4 was digested with Sbfl/Hindlll and the 3.7kb fragment was isolated, pMG259-5 was digested with Sbfi/HindllI and the 1kb fragment isolated. 25 These fragments were ligated and used to transform E.coli DH10B. The plasmid pMG265-1 was isolated. This plasmid was digested with Hindll/EcoRI and the 2kb fragment isolated and ligated into pMG55 cut with HindIll/EcoRI and the DNA was used to transform E.co/i DH10B. The plasmid pMG267-1 was Isolated and used to conjugate S.hygroscopicus var ascomyceticus ATCC 14891. 30 An apramycin resistant colony is isolated and Is grown for 24 hours in TSBGM with shaking at 30 0 C and spread onto medium 1 agar plates containing 50ug/ streptomycin. Streptomycin resistant colonies are isolated and shown to be apramycin sensitive. The 1034nt chromosomal deletion of fkbO can be verified in the mutant MG4 by Southern blotting. An overview is given in Figure 36. 35 119 Expression of RapK in the S.hygroscopicus var ascomyceticus mutant MG4 canying the chromosomal deletion of fkbO . Plasmid pSGsetRapK Is transformed into S.hygroscopicus mutant MG4 as described in the Materials and Methods section. 5 Heterologous complementation of fkbO by rapK S.hygroscopicus var ascomyceticus MG4 pSGSetRapK is grown in TSBGM at 26*C with shaking. The culture broth and mycelia are extracted using methods as described in the Materials and Methods section. The extract is analysed by LC-MS to 10 reveal the presence of a major new peak and to reveal that this contains ions that correspond to FK520 (ascomycin). Example 18 It is obvious to those skilled in the art that other biosynthetic clusters that 15 encode FKBP-ligands for example, FK506, can be modified such that the rapK homologue is deleted or inactivated using the methods as described herein. In FK506, for example; this could be done by amplifying PCR products against the regions either side of the fkbO gene (sequence accession number AF082099, AF082100), ligating these together in a vector such as pMG55, transforming the 20 FK506-producing strain, selecting for the double crossover and confirming the removal of the fkbO gene by southern blotting. Example 19 Incorporation of non-natural starter units by the rapK deletion strain, S. 25 hygroscopicus M1G2-10, into rapamycin analogues in the absence of competition by endogenous natural starter unit. As demonstrated In examples 10 and 12, the rapamycin PKS has a high degree of flexibility for non-natural starter units and in the absence of rapK, the system Is free of competition from the natural starter. In this example, the degree of 30 flexibility is further demonstrated. S. hygroscopicus MG2-10 was grown, fed and extracted according to the feeding, extraction and analysis methods outlined in Materials and Methods (Method B). The range of carboxylic acids fed along with the compounds generated are listed below. Surprisingly, all of the carboxylic acids listed were incorporated as 35 determined by observing the characteristic UV chromophore at 278 nm and 120 electrospray mass spectrometry and resulted in the production of rapamycin analogues. The rapamycin analogues generated corresponded to the formula below as described in Table VIlI: 5

R

15

R

6 R5 Ry 0 OH H7 R1 R16 = OH

R

17 = H, OH, halo, thiol, alkyl y = bond, CH 2 R15 R17

-R

16 R R17

R

17 Z R16 A B C 17

-R

1 6 17 D E F Table ViI Carboxylic acid M-H [M+K] Compound generated starter unit fed. cyclohexane carboxylic 824.7 864.6 R 15 = E, R 1 6 = 4-OH, y = bond, in acidcombination with R, = OH, R 2 = H, Rs H, acid RG= H, R 7 = H, Ra = H, R 9 = H, RIO = H, x= - H 2 3-cis,4-trans- 840.5 80.4 Ris = C. Rie = 3-cis-OH, R 17 = 4-trans-OH, in dihydroxycyclohexanecombination with R = OH, R 2 = H, R = H, dihydroyc~cloe~afleR = H, R 7 =H, R = H, R = H, RIO = H,x = carboxylic acid 1-2 1-cyclohexene 824.4 864.3 R 15 = E, R 16 = 3-OH, y = bond, in combination with R 1 = OH, R 2 = H, Rs = H, R = H, Ry = H, R8 = H, R9 = H, RIO H, x= I CH 2 121 Carboxylic acid M-H [M+K] Compound generated starter unit fed. 3-cyclohexene 840.5 880.4 R 1 0, Ri= OH, R 17 OH, in combination carboxylic acid with R, = OH, R 2 = H, R 5 = H, Re = H, R 7 H, Re = H, R, = H, Rio = H, x= OH 2 822.4 862.3 R 1 5 = A, RiB = OH, R 17 = H, in combination with R, =01H, R 2 =H, R 5 =H, Re= H, R 7 = ___H, Re=H, RgH,R QH, x=CH 2 _ cycloheptane 838.4 878.3 R 1 5 = E, Rig = OH, y = OH 2 , in combination carboylicacidwith R, = OH, R 2 = H, R5 = H, Re = H, R 7 = carboxylic acid = H,Re=H,Rio=H,x=CH 2 Methyl 2-norbomane 836.2 876.2 R15 = B, R16 = OH, R17 = H, in carboxylate combination with R, = OH, R 2 = H, Rs = H, R=H, R = H, R = H, Rg = H, Rio= H, x = CH 2=H e=H Re=H H 3-hydroxycyclohexane 824.7 864.6 R 1 5 = E, R 7 = 3-OH, y c bond, in carboxylic acid combination with R = OH, R 2 H, R 5 = H, RO = H, R 7 = H, R = H, R =H, R= H, x=

CH

2 4-hydroxycyclohexane 824.6 864.6 R 15 = E, R 1 6 = 4-OH, y = bond, in combination with R 1 = OH, R 2 = H, Rs = H, Re=H, R 7 = H, Re=H, Rg=H, R 1 0 = H,x=

CH

2 3-methylcyclohexane 838.4 878.3 R 1 5 = F, R1 7 = OH, in combination with Rn OH, R 2 =H, R =H, R = H, R 7 = H, Re = H, carboxylic acid= H, R = H, x = H 2 4-methylcyclohexane 838.4 878.3 R 15 = D, R 1 7 =OH, in combination with R, RO= H, R 2 = H, R= H, Re = H, R 7 =H,e = H, Cg=H2 I H H 3- 824.3 864.2 R 15 = E, R 1 8 = 3-OH, y = bond, in .rc .combination with R 1 = OH, R 2 = H, R 5 = H, (cis/raroxythxycid l Re= H, R 7 =H, Re = H, Rq = H, R 1 = H, x = hexane carboxylic acid OH 2 4- 824.2 864.2 R 1 5 = E, R 1 i = 4-OH, y i bond, in combination with R = OH, R 2 H, R = H, OH R2= H, R 7 = H, Rd = H, Re = H, Rio = H, x hexanearboxylic acid OH 2 ethyl 4-cyclohexanone 824.3 864.2 R 1 5 = E, R 1 = 4-OH, y = bond, in carboxylate combination with R 1 = OH, R 2 = H, Rs = H, Re = H, R 7 = H, Re = H, Re = H, R 10 = H, x = heaecabxicdCH 2 3-fluoro-4-hydroxy 843.0 882.0 R 1 5 = 0, R 1 = OH, R 17 = F, In combination combination with R1 =, R 2 = H, R= H, R = H, R 7 = (csransmethoxycycloheRaeH, Re = H, Re = H, R1 = H, x = OH 2 acid and 4-fluoro-3 hydrox cyclohexane ycarboxylic acid 3-cyclohexane oxide 841.0 880.8 R 1 5 0, R 1 3-cis-OH, R 17 = 4-trans-dH, in 122 Carboxylic acid M-H [M+K] Compound generated starter unit fed. carboxylic acid combination with R 1 = OH, R 2 = H, R 5 = H, Re= H, R 7 = H, Re = H, R 9 = H, R 1 = H, x= CH 2 3,4-cis- 841.2 881.1 R 1 5 C, Rio = 3-cis-OH, R 17 = 4-cis-OH, in dihydroxycyclohexane combination with R, = OH, R 2 = H, Re = H, Re H, R 7 =H, Re H, R 9 =H, Rio = H, x= carboxylic acid CH 2 841.2 881.1 R 1 5 = C, R 1 = 3-trans-OH, R 17 = 4-trans-OH, in combination with R 1 = OH, R 2 = H, RO = H, Re = H, R 7 = H, Re = H, R 9 = H, R 10 = H, x =

CH

2 3-chloro-4-hydroxy 858.8 898.8 R 15 = C, R 1 = OH, R 1 7 = CI, in combination with R 1 = OH, R 2 = H, Rs = H, Re = H, R 7 = cyclohexane carboxylic H, Re = H, R 9 = H, R 1 = H, x = CH 2 acid and 4-chloro-3 hydroxy cyclohexane carboxylic acid (and the pair of opposite diastereomers) cyclohexylpropionic 825.0 864.9 R 15 = C, R 1 = 3-cis-OH, R 17 = 4-trans-OH, in combination with R, = OH, R 2 = H, Rs = H, acid Re = H, R 7 = H, Re = H, R 9 = H, R 1 = H, x =

CH

2 TBC Example 20 5 Incorporation of non-natural starter units by the rapK deletion strain, S. hygroscopicus MG2-10[pSGsetrapN/OQLs], into rapamycin analogues in the absence of competition by endogenous natural starter unit. As demonstrated in examples 10, 12 and 19, the rapamycin PKS has a high degree of flexibility for non-natural starter units and in the absence of rapK, the 10 system is free of competition from the natural starter. In this example, the degree of flexibility is further demonstrated. S. hygroscopicus MG2-10[pSGsetrapN/OQLh] was grown, fed and extracted according to the feeding, extraction and analysis methods outlined in Materials and Methods (Method B). The range of carboxylic acids fed along with the compounds 15 generated are listed below. Surprisingly, all of the carboxylic acids listed were incorporated as determined by observing the characteristic UV chromophore at 278 123 nm and electrospray mass spectrometry and resulted in the production of rapamycin analogues. The rapamycin analogues generated corresponded to the formula below as described in Table IX

R

15

R

6 R6 R'5 H0 OH R7R~ = OHO

R

17 = H, OH, halo, thiol, alkyl y = bond, CH 2 R15 = R 17 R1 R16 R16-R 15 A B C 5 D E F Table IX Carboxylic acid M-H [M+K] Compound generated starter unit fed. cyctoheT~ane carboxylic 840.4 880.4 R 15 = E, R 18 = 4-OH, y = bond, In combination with R 1 = OH, R 2 = OH, R 5 = acid H, R 8 = H, Ry = H, R 8 = H, R 9 = H, R 10 = H, x=CH 2 3-cis,4-trans- 840.4 880.4 R 15 = C, R 18 = 3--cis-OH, R 17 = 4-trans-OH, in combination with R 1 = OH, R 2 = H, R dihydroxycyclohexane H, R1 = H, R = H, Ra = H, Ra = H, R 10 = H, carboxylic acid x = CH 2 856.4 896.4 R 1 = C, R 1 = 3-cis-OH; R 1 = 4-trns-OH, in combination with R 1 = OH, R 2 = OH, R = H, RJ = H, R 7 = H, R = H, R 9 = H, R 10 = H, xCH 2 124 Carboxylic acid M-H [M+K] Compound generated starter unit fed. 1-cyclohexene 824.4 864.4 R 1 5 = E, Rio = 3-OH, y = bond, in carboylicacidcombination with R, OH, R 2 = H, R 5 = H, carboxylic acid H,R 7 =H,R=H, RHRiH,x CH, 880.4 R 1 = E, R 1 = 3-OH, y = bond, in combination with R 1 = OH, R 2 = OH, R 5 = H, Re = H, R, = H, Re = H, R 9 = H, R = H, x=CH 2 3-cyclohexene 840.4 880.4 R 1 s = C, R 1 = OH, R 1 7 = OH, in combination with R, = OH, R 2 = H, RG = H, HiRed= H, R 7 = H, Re = H, R 9 = H, RI = H,x x CH 2 822.4 862.4 R 1 s = A, R 1 = OH, R 17 = H, in combination with R1 = OH, R 2 = H, R5 = H, Re = H, R 7 _ H, Re = H, R, = H, RIO = H, x== H 2 840.4 880.4 R 1 = A, Rio = OH, R 1 7 = H, in combination with R 1 = OH, R 2 = OH, R 5 = H, R = H, R 7 = H, Re = H, Re= H, R 10 = H, x = CH 2 cycloheptane 854.4 894.4 R 1 s = E, R 16 = OH, y = OH 2 , in combination with R 1 = OH, R 2 = OH, Rs = H, Re = H, R 7 = H, Re = H, Re = H, R 1 = H, x = CH 2 methyl-2-norbomane 852.4 892.4 R 15 = B, R 1 8 = OH, R 17 = H, in combination .i .d with R 1 = OH, R 2 = OH, R 5 = H, R = H, R7 carboxylicacid = H, Re = H, Re = H, R 1 = H, x CH 2 3-hydroxycyclohexane 824.4 864.4 R 1 5 = E, R 1 i = 3-OH, y bond, in .r i .combination with R = OH, R 2 = H, Rs = H, carboxyicacid = = H , RHR = H, xR= Hx= ____ ____ ____ _ __ __ _ ___ CH 2 4-hydroxycyclohexane 840.4 880.4 R 18 = E, R 1 = 4-OH, y = bond, in i .d combination with R 1 = OH, R 2 = H, R 5 = H, carboxycacid R= H, R 7 = H, Re = H, R = H, R 10 = H, x=

CH

2 824.4 864.4 Rio = E, R 1 = 4-OH, y = bond, in combination with R 1 = OH, R 2 = OH, R 5 = H, R y = H, R 7 = H, Re = H, H, R 1 i = H, xCH 2 4-methylcyclohexane 838.4 878.4 R 1 s = D, R 1 7 = OH, in combination with R OH, R 2 = H, R 5 = H, Re = H, R 7 = H, Re = H, carboxylic acid= H, R = H, x = H 2 854.4 894.4 R 15 = D, R 17 = OH, in combination with R 1 = OH, R 2 = OH, R 5 = H, Re = H, R 7 = H, R = H, R 8 =H, RIO= H, x=CH 2 125 Example 20 Incorporation of non-natural starter units by the rapK deletion strain, S. hygroscopicus MG3, into rapamycin analogues in the absence of competition by endogenous natural starter unit. 5 As demonstrated in examples 10, 12 and 19, the rapamycin PKS has a high degree of flexibility for non-natural starter units and in the absence of rapK, the system is free of competition from the natural starter. In this example, the degree of flexibility is further demonstrated. S. hygroscopicus MG3 is grown, fed and extracted according to the feeding, 10 extraction and analysis methods outlined In Materials and Methods (Method B). The range of carboxylic acids fed that can be fed is listed below. Incorporation of the carboxylic acids listed and production of rapamycin analogues is determined by observing the characteristic UV chromophore at 278 nm and electrospray mass spectrometry. 15 Carboxylic acid starter units that can be fed include. cyclohexane carboxylic acid, 3-cis,4-trans-dihydroxycyclohexane carboxylic acid, 1-cyclohexene carboxylic acid, 3-cyclohexene carboxylic acid, cycloheptane carboxylic acid, methyl 2 norbomane carboxylate, 3-hydroxycyclohexane carboxylic acid, 4 hydroxycyclohexane carboxylic acid, 3-methylcyclohexane carboxylic acid, 4 20 methylcyclohexane carboxylic acid, 3-(cis/trans)methoxycyclohexane carboxylic acid, 4-(cisltrans)methoxycyclohexane carboxylic acid, ethyl 4-cyclohexanone carboxylate, 3-fluoro-4-hydroxycarboxylic acid and 4-fluoro-3-hydroxycarboxylic acid, 3 cyclohexane oxide carboxylic acid, 3,4-cis-dihydroxycyclohexane carboxylic acid, 3 chloro-4-hydroxycarboxylic acid and 4-chloro-3-hydroxycarboxylic acid (and the pair 25 of opposite diastereomers), cyclohexylpropionic acid and 4-tert-Butylcyclohexane carboxylic acid Example 21 Incorporation of non-natural starter units by the fkbO deletion strain, S. 30 hygroscoplcus var. ascomyceticus MG4, into FK520 analogues in the absence of competition by endogenous natural starter unit. As demonstrated in examples 10, 12, 19 and 20, the rapamycin PKS has a high degree of flexibility for non-natural starter units. In the absence of fkbO, the FK520 system is free of competition from the natural starter. In this example, the 126 degree of flexibility of the FK520 PKS is investigated, free of competition from the natural starter. S. hygroscopicus var. ascomyceticus MG4 is grown, fed and extracted according to the feeding, extraction and analysis methods outlined in Materials and 5 Methods (Method B). Examples of the range of carboxylic acids that can be fed are given in Table IV. Incorporation of the carboxylic acids listed and production of FK520 analogues is determined by electrospray mass spectrometry. Example 22 10 Incorporation of non-natural starter acids into FK506 analogues by an fkbO deletion mutant of S. tsukubaensis in absence of competition from the natural starter. An fkbO deletion mutant of S. tsukubaensis is grown and fed according to the feeding methods outlined in Materials and Methods. A sub-set of the carboxylic acids listed In Table IV in Materials and Methods is fed. Analysis is performed as 15 described in Method (B) of Materials and Methods. Example 23 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetrapKL1J 9-deoxo-16-0-desmethyl-27-desmethoxy-rapamycin was obtained by 20 conjugating the S. hygroscopicus strain MG2-10 with pSGsetrapKlLh and isolating the fermentation products generated as described below. This demonstrates that it is possible to complement the deletion of rapK, rap/ and rapL in the MG2-10 strain and that 9-deoxo-16-O-desmethyl-27-desmethoxy-rapamycin is produced, an analogue which is lacking the post-PKS modifications. The feeding of pipecolic acid is not 25 required when rapL is complemented confirming that rapL plays a role in the provision of pipecolic acid in the production of rapamycin. S. hygroscopicus MG2-10 [pSGsetKILw] was fermented (see Materials and Methods), extracted and isolated using the method (B) as outlined in Materials and 30 Methods. The isocratic solvent system used for preparative HPLC was 60%

CH

3

CN/H

2 0. 9-Deoxo-16-O-desmethyl-27-desmethoxy rapamycin (Compound 6) has the following characteristics: Isolated yield: 22 mg 35 Molecular weight: 856 127 Molecular formula: C 4 gHnNOjj UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm Electrospray MS: m/z for MNa* = 878, m/z for M-H = 854 5 Table X below summarises the 'H and 1 3 C NMR data for 9-deoxo-16-0-desmethyl 27-desmethoxy rapamycin in CDCl 3 . Table X Proton SH multiplicity coupling 8 c 1 169.0 171.5 2 4.37 5.40 55.6 52.5 3a 1.51 1.75 26.5 26.3 a 3b 2.40 2.19 4a 20.9 4b 5a 1.30 1.48 25.1 5b 1.68 1.72 6a 4.45 3.26 39.0 44.4 6b 2.16 3.83 8 171.7 172.4 9a 2.41 2.54 38.7 40.2 9b 2.67 2.89 10 98.4 99.7 10-OH 6.62 5.34 br. s 11 1.37 1.51 38.7 38.7 12a 1.67 1.62 27.3 27.6 12b 1.48 1.48 13a 1.29 1.32 13b 14 4.21 3.87 71.3 69.6 15a 1

.

4 7 b 1.50 15b 1.66 1.65 16 4.21 4.06 dd 6.1, 6.1 76.0 75.6 17 141.6 138.4 18 6.08 6.22 d d 11.2 11.2 122.5 125.0 19 6.38 6.31 dd dd 14.0,11.2 14.7, 128.6 127.7 11.2 20 6.01 6.17 dd . 14.5, 131.1 132.2 10.5 21 6.04 6.04 130.3 130.3 128 Proton SH multiplicity coupling 8C 22 5.18 5.30 dd dd 14.1, 9.1 14.9, 9.3 139.4 139.1 23. 2.11 2.15 39.5 37.3 24a 1.34 1.35 40.3 40.3 24b 1.68 1.67 25 2.43 . 2.44 45.5 46.3 26 215.2 216.1 27a 2.53 2.60 46.7 47.9 27b 2.65 2.43 28 4.33 4.39 dd 7.9,3.2 71.7 71.9 29 139.6 139.6 30 5.36 5.45 d 9.9 123.7 125.4 31 3.24 3.37 ' 46.4 45.6 32 209.0 209.1 33a 2.63 2.63 39.4 39.4 33b 2.95 2.95 34 5.13 5.38 76.0 74.2 35 1.93 1.98 32.7 32.7 b 36a 1.04 1.03 37.8 39.8 36b 1.17 1.16 37 1.34 1.38 33.2 33.2 38a ax. 0.61 0.73 ddd ddd 11.9,11.9, 11.9, 33.9 34.5 11.9 11.9, 11.9 38b eq. 2.04 2.09 39 2.90 2.91 84.5 84.4 40 3.37 3.37 73.8 73.8 41a 1.31 1.31 31.2 31.2 41b 1.97 1.97 42a2 0.97 0.97 31.7 31.7 42b 43 0.93 0.93 d d 6.5 6.5 16.8" 16.9c 44 1.78 1.63 s s 15.6 12.7 45 0.98 1.00 21.7 21.7 46 1.00 1.02 16.7 19.1 47 1.58 1.48 s s 13.1 11.7 48 1.07 1.00 d 6.9 16.2 14.6 49 0.89 0.89 d d 6.8 6.8 14

.

6 d 15

.

2 d 50 3.37 3.37 s s 56.5 56.5 a: may be assigned instead to H4a 129 b: tentative assignment c: the assignment may be interchanged d: the assignment may be interchanged 5 Compound 6 exists as a 1:1 mixture of conformers in CDCl 3 .The data above is for both conformers. Where a dotted line has been drawn across the table it was not possible to determine connectivity between spin systems, hence the assignment of data to a particular conformer is not possible. 10 Example 24 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetrapKIMLh] 9-Deoxo-27-desmethoxy-rapamycin was obtained by conjugating S. hygroscopicus MG2-1 0 strain with pSGsetKIMLt, as described in example I and isolating the products produced on fermentation. This demonstrated that it was 15 possible to complement the deletion of rapK, rapl, rapM and rapL in the MG2-10 strain with the production of a rapamycin analogue lacking some post-PKS modification. S. hygroscopicus MG2-1 0 [pSGsetKIML4s] was fermented (see Materials and Methods), extracted and isolated using the method (B) as outlined in Materials and 20 Methods. The isocratic solvent system used for preparative HPLC was 75% CH 3

CN/H

2 0 9-Deoxo-27-desmethoxy rapamycin (Compound 16) has the following characteristics: Isolated yield: 24 mg Molecular weight: 870 25 Molecular formula: CsoH 7 9

NO

1 1 UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 .- nm Electrospray MS: m/z for MNa* = 892, m/z for M-H = 868 Table X below summarises the 'H and 1 3 C NMR data for 9-deoxo-27-desmethoxy 30 rapamycln in CDCl 3 . Table XI Position 8H multiplicity coupling 6C 1 171.0 2 5,37 m 52.0 3a 1.73 m 26.8 3b 2.22 m 130 Position SH multiplicity coupling SC 4a 1.39 m 20.5 4b 1.73 m 5a 1.56 m 25.1 5b 1.77 m 6a 3.34 m 43.5 6b 3.85 br. d 12.9 8 173.4 9a 2.43 d 14.4 38.8 9b 2.74 d 14.4 10 98.0 10-OH 6.02 s 11 1.43 m 39.1 12a 1.44 m 2.7.5 12b 1.58 m 13a 1.28 m 32.2 13b 1.45 m 14 3.61 m 65.8 15a 1.55. m 38.6 15b 1.64 m 16 3.70 dd 10.8, 4.7 84.5 17 134.8 18 5.98 d 9.2 130.8 19 6.34 m 126.9 20 6.32 m 133.1 21 6.11 dd 15.3, 9.0 130.6 22 5.46 dd 15.2, 8.6 139.3 23 2.22 m 35.7 24a 1.28 m 40.2 24b 1.49 m 25 2.58 m 44.8 26 215.0 27a 2.65 m 46.2 27b 2.65 m 28 4.37 m 73.1 29 139.8 30 5.32 d 9.9 124.5 31 3.38 m 46.3 32 208.9 33a 2.59 m 41.4 33b 2.59 m 34 5.04 ddd 5.2, 5.2, 5.2 75.7 131 Position 81 multiplicity coupling Sc 35 1.97 m 33.4 36a 1.11 m 38.6 36b 1.26 m 37 1.41 m 33.1 38a ax. 0.69 ddd 12.3,12.3,12.3 34.1 38b eq. 2.11 m 39 2.93 m 84.4 40 3.37 m 73.9 41a 1.32 m 31.2 41b 1.97 m 42a 1.00 m 31.6 42b 1.68 m 43 0.88 d 6.4 16.9 44 3.10 s 55.6 45 1.59 s 9.9 46 1.02 d 7.2 20.5 47 1.03 d 7.1 15.7 48 1.67 s 12.2 49 1.12 d 6.8 16.3 50 0.92 d 6.8 15.8 51 3.39 s 56.5 Example 25 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetKIN/OLh] 9-Deoxo-16-0-desmethyl-27-O-desmethyl-rapamycin was obtained by 5 conjugating S. hygroscopicus MG2-10 strain with pSGsetKIN/OLN, as described in Example I and isolating the products produced on fermentation. This demonstrated that it was possible to complement the deletion of rapK, rapid, mpNIO and rapL in the. MG2-1 G strain with the production of a rapamycin analogue lacking some post-PKS modification. 10 S. hygroscopicus MG2-10 [pSGsetKIN/OLJ,] was fermented (see Materials and Methods), extracted and isolated using the method (B) as outlined in Materials and Methods. The isocratic solvent system used for preparative HPLC was 60% CH 3

CN/H

2 0. 9-Deoxo-16-O-desmethyl-27-O-desmethylrapamycin (Compound 9) has the following 15 characteristics: Isolated yield: 77 mg Molecular weight: 872 132 Molecular formula: CaHnNO 12 UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm Electrospray MS: m/z for MNa = 894, m/z for M-H = 870 5 Table XIl below summarises the 'H and 13C NMR data for 9-deoxo-16-0-desmethyl 27-O-desmethylrapamycin in CDCl 3 . Table XI Position mH multiplicity coupling SC 1 172.1 2 5.55 m 52.8 3a 1.74 m 26.0 3b 2.21 m 4a 1.18 m 21.1 4b 1.73 m 5a 1.44 m 25.2 5b 1.73 m 6a 3.28 m 45.7 6b 3.87 m 8 171.6 9a 2.41 d 12.5 42.3 9b 3.34 d 12.5 10 99.2 10-OH 4.15 m 11 1.61 m 38.3 12a 1.50 m 27.9 12b 1.61 m 13a 1.36 m 31.5 13b 1.52 m 14 .. 3.99 m 72.5 15a 1.45 m 40.9 15b 1.70 m 16 3.86 m 75.3 17 140.0 18 6.44 d 11.4 121.9 19 6.33 dd 14.4,11.4 128.6 20 6.20 dd 14.8,10.6 131.2 21 6.02 dd 14.9,10.6 131.2 22 5.25 m 137.4 23 2.26 m 35.3 24a 1.21 m 41.1 133 Position 8N multiplicity coupling Sc 24b 1.21 m 25 2.37 m 40.9 26 212.8 27 4.55 d 2.3 74.9 28 4.20 77.3 29 135.8 30 5.25 m 124.9 31 3.29 m 44.9 32 208.0 33a 2.53 dd 18.2, 4.0 42.2 33b 2.81 dd 18.2, 10.6 34 5.28 ddd , 4.0, 4.0 75.8 35 1.71 m 31.2 36a- 0.92 m 36.9 36b 1.04 m 37 1.23 m 32.6 38a ax. 0.28 ddd 11.9, 11.9, 34.2 11.9 38b eq. 1.88 m 39 2.85 84.8 40 3.29 m 74.1 41a 1.26 m 31.3 41b 1.92 m 42a 0.88 m 32.3 42b 1.57 m 43 0.98 d 6.2 16.6 44 1.59 s 14.6 45 1.01 d 6.4 21.4 46 0.89 d 6.4 12.0 47 1.90 s

-

15.7 48 0.92 d 6.4 15.6 49 0.84 d 6.8 17.6 50 3.37 s 57.5 Example 26 isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetKJLh] 16-O-Desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin was obtained by 5 conjugating S. hygroscopicus MG2-10 strain with pSGsetKJLil as described in Example I and isolating the products produced on fermentation. This demonstrated 134 that it was possible to complement the deletion of rapK, rapJ and rapL in the MG2-1 0 strain with the production of a rapamycin analogue lacking some post-PKS modification. S. hygroscopicus MG2-1 0 [pSGsetKJLi,] was fermented (see Materials and 5 Methods), extracted and isolated using the method (B) as outlined in Materials and Methods. The isocratic solvent system used for preparative HPLC was 55% CH 3

CN/H

2 O. 16-0-Desmethyl-27-desmethoxy-39-O-desmethy rapamycin (Compound 3) has the following characteristics: 10 Isolated yield: 176 mg (mixture of 2 interconverting isomers) Molecular weight: 856 Molecular formula: C 4 sH 73 NO12 UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm 15 Electrospray MS: m/z for MNa = 878, m/z for M-H = 854 MS fragmentation: The sodiated adduct (m/z 878) was fragmented to provide three fragments: C8-C42, m/z MNa* 749; C1-C27, m/z MNa* 570; C28-C42+C1 C14, m/z MNa' 628. The fragment Ions 628 and 570 were fragmented further to give the same fragment: C1-C14, m/z MNa* 320. The mass of this C1-C14 fragment is 20 14 mass units greater than the equivalent fragment from the fragmentation of the sodiated adduct of 9-deoxo-16-O-desmethyl-27-desmethoxy-39-0-desmethy rapamycin (Compound 1) consistent with oxidation at C9. Example 27 25 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetKMNOLh] 9-Deoxo-27-0-desmethyl-39-O-desmethyl-rapamycin was obtained by conjugating S. hygroscopicus MG2-10 strain with pSGsetKMN/OLi, as described in example 1 and isolating the products produced on fermentation. This demonstrated that it was possible to complement the deletion of rapK, rapM, rapN/O and rapL in 30 the MG2-1 0 strain with the production of a rapamycin analogue lacking some post PKS modification. S. hygroscopicus MG2-10 [pSGsetKMN/OL,] was fermented (see Materials and Methods), extracted and Isolated using the method (B) as outlined in Materials and Methods. 35 The isocratic solvent system used for preparative HPLC was 60% CH 3

CNIH

2 O. 135 9-Deoxo-27-0-desmethyl-39-0-desmethy rapamycin (Compound 8) has the following characteristics: Isolated yield: 6 mg Molecular weight: 872 5 Molecular formula: C 49

H

77

NO

2 UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm Electrospray MS: m/z for MNa = 894, m/z for M-H = 870 MS fragmentation: The sodiated adduct (m/z 894) was fragmented to provide 10. three fragments: C8-C42, m/z MNa* 765; C1-C27, m/z MNa' 586; C28-C42+C1 C14, m/z MNa 614. The fragment ions 614 and 586 were fragmented further to give the same fragment: C1-C14, m/z MNa* 306. The C1-C14 is identical to that obtained from fragmentation of the sodiated adduct of 9-deoxo-16-O-desmethyl-27 desmethoxy-39-O-desmethyl rapamycin; the compound is 9-deoxo. The C1-C27 15 fragment is 30 mass units greater than the equivalent fragment from 9-deoxo-16-0 desmethyl-27-desmethoxy-39-O-desmethyl rapamycin, consistent with one hydroxylation and one methylation; RapM methylates the hydroxy group at C-16 (see Example 22 for pSGsetKiLhL, together with Example 23 pSGsetKIMLl,) and RapN in combination with RapO hydroxylates C27 so the data is consistent with the 20 compound being 9-deoxo-27-0-desmethyl-39-0-desmethyl rapamycin (Compound 8). Example 28 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetKIJLh] 25 1 6-0-desmethyl-27-desmethoxy-rapamycin was obtained by conjugating S. hygrosoopicus MG2-1 0 strain with pSGsetKIJL 1 s as described in Example I and isolating the products produced on fermentation. This demonstrated that it was possible to complement the deletion of rapK, rapl, rapJ and rapL in the MG2-10 strain with the production of a rapamycin analogue lacking some post-PKS 30 modification. S. hygroscopicus MG2-1 0 [pSGsetKIJLlsl was fermented (see Materials and Methods), extracted and isolated using the method (B) as outlined in Materials and Methods. The isocratic solvent system used for preparative HPLC was 60% CH 3

CNIH

2 0. 136 16-O-Desmethyl-27-desmethoxy rapamycin (Compound 12) has the following characteristics: Isolated yield: 11 mg Molecular weight: 870 5 Molecular formula: C 4 9

H

75

NO

12 UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm Electrospray MS: m/z for MNa* = 892, m/z for M-H = 868 10 Example 29 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetKLt.] 9-Deoxo-1 6-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin was obtained by conjugating S. hygroscopicus MG2-10 strain with pSGsetKLh, as described in example 1 and isolating the products produced on fermentation. This 15 demonstrated that it was possible to complement the deletion of rapK and rapL. in the MG2-1 0 strain with the production of a rapamycin analogue lacking post-PKS modification (pre-rapamycin). S. hygroscopicus MG2-10 [pSGsetKLs,] was fermented, extracted and isolated using the methods outlined in Materials and Methods. 20 The isocratic solvent system used for preparative HPLC was 60%

CH

3

CN/H

2 0. 9-Deoxo-16-0-desmethyl-27-desmethoxy-39-O-desmethyI rapamycin (Compound 1) has the following characteristics: Isolated yield: 24 mg 25 Molecular weight 842 .. Molecular formula: CaHsNOn UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm Electrospray MS: m/z for MNa* = 864, m/z for M-H = 840 30 MS fragmentation: The sodiated adduct (m/z 864.5) was fragmented to provide four fragments: C8-C42, m/z MNa 735; CI-C27, m/z MNa' 556; C28 C42+C1-C14, m/z MNa' 614, C1-C14, m/z MNa' 306. The expected m/z for these fragments were determined by comparison to the reported fragmentation of rapamycin (J. A. Reather, Ph.D. Dissertation, University of Cambridge, 2000). These 137 fragments have the same m/z as the predicted m/z for the fragmentation of 9-deoxo 16-O-desmethyl-27-desmethoxy-39-0-desmethy rapamycin. Example 30 5 Isolation of product from fermentation of S. hygroscopicus MG2-10 fed with cyclohexane carboxylic acid 9-Deoxo-1 6-0-desmethyl-27-desmethoxy-39-desmethoxy-rapamycin was obtained on feeding cyclohexane carboxylic acid to S. hygroscopicus MG2-1 0 and isolating the products produced on fermentation. The resulting mutasynthesis 10 demonstrated that it was possible to chemically complement the deletion of rapK In the MG2-1 0 strain, in the absence of natural endogenous starter, with the resulting production of a rapamycin analogue lacking post-PKS modification. S. hygroscopicus MG2-10 was fermented (see Materials and Methods), fed (see Materials and Methods), extracted and isolated using the method (B) as outlined 15 in Materials and Methods. The isocratic solvent system used for preparative HPLC was 60%

CH

3

CN/H

2 0. 9-Deoxo-16-0-desmethyl-27-desmethoxy-39-desmethoxy rapamycin (Compound 47) has the following characteristics: 20 Isolated yield: 12 mg Molecular weight: 826 Molecular formula: C 4 eH 7 sNO UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm 25 Electrospray MS: m/z for MNa = 848.5, m/z for M-H = 825 MS fragmentation: The sodiated adduct (m/z 848.5) was fragmented to provide.four fragments: C8-C42, m/z MNa' 719; C1-C27,' mz MNa* 556; C28 C42+C1-C14, m/z MNa* 598, C1-C14, m/z MNa* 306. These data illustrate that the difference between Compound 47 and 9-deoxo-16-0-desmethyl-27-desmethoxy-39 30 0-desmethyl rapamycin (Compound 1) is located in the region of C28-C42. This fragment Is 16 mass units less for Compound 47 than it Is for Compound 1, consistent with Compound 47 being 9-deoxo-16-O-desmethyl-27-desmethoxy-39 desmethoxy rapamycin. 35 Example 31 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetKNOLh] 138 9-Deoxo-16-O-desmethyl-27-O-desmethyl-39-O-desmethyl-rapamycin is obtained by conjugating S. hygroscopicus MG2-10 strain with pSGsetKN/OLN, as described in Example 1 and isolating the products produced on fermentation. This demonstrates that it is possible to complement the deletion of rapK, rapNIO and rapL 5 in the MG2-10 strain with the production of a rapamycin analogue lacking some post PKS modification. S. hygroscopicus MG2-10 [pSGsetKN/OLw] is fermented (see Materials and Methods), extracted and isolated using the method (B) as outlined in Materials and Methods. 10 The isocratic solvent system used for preparative HPLC is 60% CH 3 CN/H20. 9-Deoxo-16-0-desmethyl-27-O-desmethyl-39-0-desmethyl rapamycin (Compound 2) has the following characteristics: Molecular weight: 858 Molecular formula: C 48

H

75

NO

12 15 UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm Electrospray MS: m/z for MK'= 896, m/z for M-H = 856 Example 32 20 Identification of product from fermentation of S. hygroscopicus MG2 10[pSGsetKJNOLh] 16-O-Desmethyl-27-0-desmethyl-39-0-desmethy-rapamycin was obtained by conjugating S. hygroscopicus MG2-10 strain with pSGsetKJN/OLts as described in example I and analysing the products produced on fermentation. This 25 demonstrated that it was possible to complement the deletion of rapK, rapJ, rapN/O and repL in the MG2-10 strain with the production of a rapamycin analogue lacking some post-PKS modification. The fermentation broth (1 mL) was treated as described in the extraction, isolation and analysis Method (B) described in Materials and Methods. The HPLC 30 chromatograml (280 nm) contained a peak that had the characteristic rapamycin triene (268 nm, 278 nm, 288 nm). This peak was not observed in the chromatogram of the control sample extracted from S. hygroscopcus MG2-1 0 in the absence of the cassette. LCMS (see Materials and Methods, Method B) of the novel rapamycin analogue peak gave ions m/z 895 (MNa*) and 871 (M-H). These ions confirm that the 35 molecular weight of the novel rapamycin analogue is 872, 30 mass units greater than 139 9-deoxo-16-O-desmethyl-27-desmethoxy-39-0-desmethyl rapamycin (Compound 1), consistent with oxidation at C9 (rapJ) and hydroxylation at C27 (rapN/0). These data are consistent with the compound being 16-0-desmethyl-27-0-desmethyl-39-0 desmethyl rapamycin (Compound 7). 5 Example 33 Isolation of product from fermentation of S. hygroscopicus MG2-10[pSGsetKJNOLh] 16-O-Desmethyl-27-O-desmethyl-39-O-desmethyl-rapamycin is obtained by conjugating S. hygroscopicus MG2-1 0 strain with pSGsetKJN/OLh, as described in 10 Example I and isolating the products produced on fermentation. This demonstrates that it is possible to complement the deletion of rapK, rapJ, rapN/O and rapL in the MG2-10 strain with the production of a rapamycin analogue lacking some post-PKS modification. S. hygroscopicus MG2-10 [pSGsetKJN/OLs,] is fermented (see Materials and 15 Methods), extracted and Isolated using the method (B) as outlined in Materials and Methods. The isocratic solvent system used for preparative HPLC is 60% CH 3

CN/H

2 O. 16-0-Desmethyl-27-0-desmethyl-39-0-desmethyl rapamycin (Compound 7) has the following characteristics: 20 Molecular weight: 872 Molecular formula: C 48 HnNO13 UV (by diode array detection during HPLC analysis): 268 nm, 278 nm, 288 nm Electrospray MS: m/z for MNa* = 895, m/z for M-H = 871 25 Example 34 Identification of product from fermentation of S. hygroscopicus MG2-10 [pSGsetKIJNOQLh] 16-0-Desmethyl-rapamycin was obtained by conjugating S. hygroscopicus 30 MG2-10 strain with pSGsetKIJN/OQL, as described in example 1 and analysing the products produced on fermentation. This demonstrated that it was possible to complement the deletion of rapK, rapl, rapJ, rapN/O, rapQ and rapL in the MG2-10 strain with the production of a rapamycin analogue lacking methylation at C16-OH. In addition, it clearly identified RapQ as the SAM-dependent 0-methyltransferase 35 responsible for methylation of C27-OH. 140 S. hygroscopicus MG2-10 [pSGsetKIJN/OQLi,] was fermented (see Materials and Methods), extracted and analysed using the method (B) as outlined in Materials and Methods. The fermentation broth (1 mL) was treated- as described in Materials and 5 Methods. The HPLC chromatogram (280 nm) contained a peak that had the characteristic rapamycin triene (268 nm, 278 nm, 288 nm). This peak was not observed in the chromatogram of the control sample extracted from S. hygroscopicus MG2-1 0 in the absence of the cassette. LCMS (see Materials and Methods) of the novel rapamycin analogue peak gave ions m/z 923 (MNa*) and 899 (M-H). These 10 ions confirm that the molecular weight of the novel rapamycin analogue is 900, 14 mass units less than rapamycin. It has already been established that the only post PKS gene not included in the cassette, rapM, acts to methylate the C16-OH, hence the novel rapamycin analogue is 16-0-desmethyl rapamycin (Compound 20) and rapQ is shown to be functional and acting to O-methylate at C27. 15 Example 35 Bioassay of rapamycin analogues: (1) = 9-deoxo-16-O-desmethyl-27-desmethoxy-39-O-desmethy-rapamycin 20 (pre-rapamycin) (6) = 9-deoxo-16-0-desmethyl-27-desmethoxy-rapamycin (16) = 9-deoxo-27-desmethoxy-rapamycin, (3) = 16-0-desmethyl-27-desmethoxy-39-0-desmethyl-rapamycin (9) = 9-deoxo-16-Odesmethyl-27-0-desmethyl-rapamycin 25 (8) = 9-deoxo-27-O-desmethyl-39-O-desmethyl-rapamycin. Cancer Cell Lines .Orowth inhibition of adherent human tumour cell lines bf solid malignancies HT29 (colon) and MCF-7 (breast) was tested in vitro using an MTT (3-(4,5 dimethylthiazol-2-yl)-2,5-diphenytetrazolium bromide) assay using micro-titre plates 30 (Sleuwerts, A.M., et al., 1995). All cell lines were obtained from either the ATCC (American Type Culture Collection) or ECACC (European Collection of Cell Cultures). All cell lines were grown from frozen stocks and passaged at least once prior to use in RPMI 1640. Cells were harvested from sub-confluent cultures using minimal trypsinization. Cells were diluted to the appropriate density for each cell line 35 (dependent on cell doubling time) in RPMI 1640, and seeded in 60 wells of a 96 well plate in a volume of 100 pl per well (i.e. outside wells of the plate were not used). 141 Plates were incubated at 370C overnight. Following this incubation, log scale dilutions of reference and test substances were added in 100 pl per well, 6 replicates were used to test all test compounds, reference compounds and medium controls. Plates were Incubated for a further 72 h prior to analysis. MTT (5 mg/ml) was added 5 to each well and plates were re-incubated for 3-4 h. Unreacted MTT was removed from the wells and formazan crystals formed from the MTT were dissolved in DMSO and characteristic absorbance read at 570 nm. The concentration (nM) of each test compound and reference compound, which resulted in 50% of maximum inhibition

(IC

5 0 ), , was calculated for each cell line and quoted along with the maximum 10 percentage of inhibition observed (1m), see Table XIII. For reference, rapamycin has an IC 5 0 of 200nM and an Im of 40% in the HT-29 cell line and an IC 5 0 of 0.O3nM and an Im of 56% in the MCF-7 cell line. Table XII1 Assay 1 6 - 16 3 9 8 IC50 Im ICS Ima IC 50 1m IC 5 0 Im IC 50 Im ICS 0 Im HT29 50.1 38 25 38 15.8 25 63.1 37 12.6 35 63 30 rIC 5 0 MCF-7 3.2 38 126 48 2 32 20 38 17.8 40 20 38 rIC 5 0 15 Mixed Lymphocyte Reaction (MLR): Originally developed to assess tissue compatibility prior to allografts, MLR offers an established model for immune reaction in vitro (SOULILLOU, J.P., et al. 20 (1975); T. Meo. immunologicall Methods", L. Lefkovits and B. Pemis, Eds., Academic Press, N.Y. pp. 227-239 (1979). MLR was performed by mixing splenic lymphocytes isolated from C57BL/6 mice (5x10 cells) with inhibited splenic lymphocytes from CBA mice (2.5x105 cells). The Inhibited CBA lymphocytes induced a proliferative response in C57BL/6 lymphoctes and this was determined by (rH] thymidine 25 incorporation Into DNA as a measure of proliferation of splenic lymphocytes isolated from C57BLJ6 mice. The anti-proliferative effect was assayed for in the presence of log scale dilutions of reference compounds, test compounds and media controls over a 72 h period at 37 "C. The concentration of each test compound and reference compound, which Inhibited lymphocyte proliferation by 50% (IC5o), compared to 30 control proliferation, was calculated for each cell line and quoted as a ratio of the 142 concentration of rapamycin required to inhibit lymphocyte proliferation by 50% (rCo), see Table XIV. Table XIV Assay 1 6 16 3. 9 8 MLR 9.4 8.8 >14.7 7.9 6.5 4.1 rICs 0 5 Anti-fungal Assay: The comparative anti-fungal activities of reference and test compounds were determined against pathogenic fungi Candida albicans DSM 5816, Candida albicans DSM 1386 and Candida glabrata DSM 11226. This was achieved using a microtitre 10 plate adaption of the NCCLS Reference Method for Broth Dilution Antifungal Susceptibility Testing for Yeasts: Approved Standard (M27-A, vol. 17 No. 9. (1997)). Yeast strains were inoculated (104 cfu/ml) to RPMI 1640 media containing 0.165 mM MOPS, pH 7. Growth was determined in the presence of log scale dilutions of reference compounds, test compounds and media controls after incubation with 15 . shaking at 37 "C, 24 h. Minimum inhibitory concentration (MIC) and minimum fungicidal activity (MFC) were determined for test compounds and expressed as a ratio of the rapamycin minimum inhibitory concentration (rMIC respectively), see Table XV. Table XV Assay 1 6 16 3 9 8 C. albicans DSM 5816 1 1 1 1 1 1 rMIC C. albicans DSM1386 5 5 5 1 1 1 rMIC C. glabrata DSM 11226 5 5 5 1 1 1 rMIC 20 References Alarcon, C.M., Heitman, J., and Cardenas, M.E. (1999) Protein kinase activity and 25 identification of a toxic effector domain of the target of rapamycin TOR 143 proteins in yeast. Molecular Biology of the Cell 10: 2531-2546. Aparico, J.F., Molndr, I., Schwecke, T., Kdnig, A., Haydock, S.F., Khaw, L.E., Staunton, J., and Leadlay, P.F. (1996) Organization of the biosynthetic gene cluster for rapamycin in Streptomyces hygroscopicus: analysis of the 5 enzymatic domains in the modular polyketide synthase. Gene 169: 9-16. Baker, H., Sidorowicz, A., Sehgal, S.N., and V6zina, C, (1978) Rapamycin (AY 22,989), a new antifungal antibiotic. Ill. /n vitro and in vivo evaluation. Journal of Antibiotics 31: 539-545. Bierman, M., Logan, R., O'Brien, K., Seno, E.T., Nagaraja Rao, R., and Schoner, 10 B.E. (1992) Plasmid cloning vectors for the conjugal transfer of DNA from Escherichia coli to Streptomyces spp. Gene 116: 43-49. Blanc, V., Lagneaux, D., Didier, P., Gil, P., Lacroix, P., and Crouzet, J. (1995) Cloning and analysis of structural genes from Streptomyces pristinaespiralis encoding enzymes involved In the conversion of pristinamycin 1l to 15 pristinamycin lIA (PIlA): PIIA synthase and NADH:riboflavin 5'-phosphate oxidoreductase. Joumal of Bacteriology 177: 5206-5214. Blanc, V., Gil, P., Bamas-Jacques, N., Lorenzon, S., Zagorec, M., Schleuniger, J., Bisch, D., Blanche, F., Debussche, L., Crouzet, J., and Thibaut, D. (1997) Identification and analysis of genes from Streptomyces pristinaespiralis 20 encoding enzymes involved in the biosynthesis of the 4-dimethylamino-L phenylalanine precursor of pristinamycin I. Molecular Microbiology 23: 191 202. Box, S.J., Shelley, P.R., Tyler, J.W., Verrall, M.S., Warr, S.R.C., Badger, A.M., Levy, M.A., and Banks, R.M. (1995) 27-0-Demethylrapamycin, an 25 immunosuppressant compound produced by a new strain of Streptomyces hygroscopicus. Journal of Antibiotics 48: 1347-1349. Brown, E.J., Albers, M.W., Shin, T.B., Ichikawa, K., Keith, C.T., Lane, W.S., and Schreiber, S.L. (1994) A mammalian protein targeted by G1-arresting rapamycin-receptor complex. Nature 369: 756-758. 30 Brunn, G.J., Williams, J., Sabers, C., Wiederrecht, G., Lawrence, J.C., and Abraham, R.T. (1996) Direct inhibition of the signaling functions of the mammalian target of rapamycin by the phosphoinositide 3-kinase inhibitors, wortmannin and LY294002. EMBO Journal 15: 5256-5267. Cao, W., Mohacsi, P., Shorthouse, R., Pratt, R. and Morris, R.E. (1995). Effects of 35 rapamycin on growth factor-stimulated vascular smooth muscle cell DNA 144 synthesis. Inhibition of basic fibroblast growth factor and platelet-derived growth factor action and antagonism of rapamycin by FK506. Transplantation 59(3): 390-395. Carlson, R.P., Hartman, D.A., Tomchek, L.A., Walter, T.L., Lugay, J.R., Calhoun, W., 5 Sehgal, $.N., Chang, J.Y. (1993). Rapamycin, a potential disease-modifying antiarthritic drug. J. Pharmacol. Exp. Ther. 266(2):1125-38. Chambraud, B., Radanyi, C., Camonis, J.H., Shazand, K., Rajkowski, K., and Baulieu, E.E. (1996) FAP48, a new protein that forms specific complexes both immunophilins FKBP59 and FKBP12. Prevention by the immunosuppressant 10 drugs FK506 and rapamycin. Journal of Biological Chemistry 271: 32923 32929. Chang, J.Y., Sehgal, S.N., and Bansbach, C.C. (1991) FK506 and rapamycin: novel pharmacological probes of the immune response. Trends in Pharmacological Sciences 12: 218-223. 15 Chen, J., Zheng, X.F., Brown, E.J., and Schreiber, S.L (1995) Identification of an 11 kDa FKBP1 2-rapamycin-binding domain within the 289-kDa FKBP1 2 rapamycin-associated protein and characterization of a critical seine residue. Proceedings of the National Academy of Sciences of the United States of America 92: 4947-4951. 20 Chini, M., Crotti, P., Gardelli, C., and Macchia, F., (1992), Tetrahedron, 48, 3805 3812 Choi, J.W., Chen, J., Schreiber, S.L, and Clardy, J. (1996) Structure of the FKBP12 rapamycin complex interacting with the binding domain of human FRAP. Science 273: 239-242. 25 Chung, L., Liu, L, Patel, S., Camey, J.R., and Reeves, C.D. (2001) Deletion of rapQNML from the rapamycin gene cluster of Streptdrnyces hygroscopicus bives production of the 16-0-desmethyl-27-desmethoxy analog. Journal of Antibiotics 54: 250-256. Corey, E.. J. and Huang, H., (1989) Tetrahedron Lett., 30, 5235-5238 30 DiLella, A.G., and Craig, R.J. (1991) Exon organization of the human FKBP-12 gene: correlation with structural and functional protein domains. Biochemistry 30: 8512-8517. Du, L.C., S~nchez, C., Chen, M., Edwards, D.J., and Shen, B. (2000) The blosynthetic gene cluster for the antitumor drug bleomycin from Streptomyces 35 verticilus ATCC15003 supporting functional interactions between 145 nonribosomal peptide synthetases and a polyketide synthase. Chemistry & Biology 7: 623-642. Dudkin, L., Dilling, M.B., Cheshire, P.J., Harwood, F.C., Hollingshead, M., Arbuck, S.G., Travis, R., Sausville, E.A., Houghton, P.J. (2001). Biochemical 5 correlates of mTOR inhibition by the rapamycin ester CCI-779 and tumor growth inhibition. Clin. Cancer Res. 7(6):1758-64 Fehr, T., Sanglier, J-J., Schuler, W., Gschwind, L., Ponelle, M., Schilling, W., Wioland, C. (1996). Antascomicinc A, B, C, D and E: Novel FKBP12 binding compounds from a Micromonospora strain. J. Antibiot. 49(3): 230-233. 10 Ferrari, S., Pearson, R.B., Slegmann, M., Kozma, S.C., and Thomas, G. (1993) The immunosuppressant rapamycin induces inactivation of P 70

*

6 k through dephosphorylation of a novel set of sites. Journal of Biological Chemistry 268: 16091-16094. Findlay J.A, and Radics, L (1980) Canadian Journal of Chemistry 58:579. 15 Fishbein, T.M., Florman, S., Gondolesi, G., Schiano, T., LeLeiko, N., Tschemia, A., Kaufman, S. (2002). Intestinal transplantation before and after the introduction of sirolimus. Transplantation. 73(10):1538-42. Foey, A., Green, P., Foxwell,.B., Feldmann, M., Brennan, F. (2002). Cytokine 20 stimulated T cells induce macrophage IL-10 production dependent on phosphatidylinositol 3-kinase and p70S6K: implications for rheumatoid arthritis. Arthritis Res. 4(1):64-70. Epub 2001 Oct 10. Gaisser, S., Reather, J., Wirtz, G., Kellenberger, L., Staunton, J., and Leadlay, P.F. (2000) A defined system for hybrid macrolide biosynthesis in 25 Saccharopolyspora erythraea. Molecular Microbiology 36: 391-401. Gaisser..S., Lill, R., Staunton, J., Mendez, C., Salas, J., Leadly, PF. (2002) Parallel pathways for oxidation of 14-membered polyketide macrolactones in Saccharopolyspora erythraea. Mol Microbiol 44:771-81. Galat, A. (2000) Sequence diversification of the FK506-binding proteins in several 30 different genomes. European Journal of Biochemistry 267: 4945-4959. Gregory, C.R., Huie, P., Billingham, M.E. and Morris, R.E. (1993). Rapamycin inhibits arterial intimal thickening caused by both alloimmune and mechanical injury. Its effect on cellular, growth factor and cytokine response in injured vessels. Transplantation 55(6):1409-1418. 35 Gregory MA, Till R, Smith, MCM. (in Press) Integration site for Streptomyces phage 146 <DBTI and the development of site-specific integrating vectors. J Bacteriol. Guba, M., von Breitenbuch, P., Steinbauer, M., Koehl, G., Flegel, S., Hornung, M., Bruns; C.J., Zuelke, C., Farkas, S., Anthuber, M., Jauch, K.W., and Geissler, E.K (2002) Rapamycin inhibits primary and metastatic tumor growth by 5 antiangiogenesis:. involvement of vascular endothelial growth factor. Nature Medicine 8: 128-135. Hamilton, G.S., and Steiner, J.P. (1998) Immunophilins: Beyond Immunosuppression. Journal of Medicinal Chemistry 41: 5119-5143. Hara, K., Yonezawa, K., Kozlowski, M.T., Sugimoto, T., Andrabi, K., Weng, Q.P., 10 Kasuga, M., Nishimoto, I., and Avruch, J. (1997) Regulation of elF-4E BP1 phosphorylation by mTOR. Journal of Biological Chemistry 272- 26457 26463. Hardwick, J.S., Kuruvilla, F.G., Tong, J.K., Shamji, A.F., and Schreiber, S.L. (1999) Rapamycin-modulated transcription defines the subset of nutrient-sensitive 15 signaling pathways directly controlled by the Tor proteins. Proceedings of the National Academy of Sciences of the United States of America 96: 14866 14870. Hatanaka, H., Kino, T., Miyata, S., Inamura, N., Kuroda, A., Goto, T., Tanaka, H., Okuhara, M. (1988). FR-900520 and FR-900523, novel immunosuppressants 20 isolated from a Streptomyces. II. Fermentation, isolation and physico chemical and biological characteristics.J. Antibiot. (Tokyo). 41(11):1592-601. Hatanaka H, Kino T, Asano M, Goto T, Tanaka H, Okuhara M. (1989). FK-506 related compounds produced by Streptomyces tsukubaensis No. 9993. J. Antibiot. (Tokyo). 42(4):620-2. 25 Hendrickson, BA, Zhang, W., Craig, R.J., Jin, Y.J., Bierer, B.E., Burakoff, S., and DiLella, A.G. (1993) Structural organization of the gends encoding human and urinee FK506-binding protein (FKBP)13 and comparison to FKBP1. Gene 134: 271-275. Hentges, K.E., Sirry, B., Gingeras, A.C., Sarbassov, D., Sonenberg, N., Sabatini, D., 30 and Peterson, A.S. (2001) FRAP/mTOR is required for proliferation and patterning during embryonic development in the mouse. Proceedings of the National Academy of Sciences of the United States of America 98: 13796 13801. Hopwood, D.A. (1997) Genetic contributions to understanding polyketide synthases. 35 Chemical Reviews 97: 2465-2497. 147 Hosted, T.J., and Baltz, R.H. (1997) Use of rpsL for dominance selection and gene replacement in Streptomyces roseosporus. Journal of Bacteriology 179: 180 186. Hung, D.T.,- and Schreiber, S.L. (1992) cDNA cloning of a human 25 kDa FK506 and 5 rapamycin. binding protein. Biochemical and Biophysical Research Communications 184: 733-738. Hung, D.T., Jamison, T.F., and Schreiber, S.L. (1996) Understanding and controlling the cell cycle with natural products. Chemistry & Biology 3: 623-639. Jain, S., Bicknell,-G.R., Whiting, P.H., Nicholson, M.L. (2001). Rapamycin reduces 10 expression of fibrosis-associated genes in an experimental model of renal ischaemia reperfusion injury. Transplant Proc. 33(1-2):556-8. Jin, Y.J., Burakoff, S.J., and Bierer, B.E. (1992) Molecular cloning of a 25-kDa high affinity rapamycin binding protein, FKBP25. Journal of Biological Chemistry 267: 10942-10945. 15 Kahan, B.D., Chang, J.Y., and Sehgal, S.N. (1991) Preclinical evaluation of a new potent immunosuppressive agent, rapamycin. Transplantation 52: 185-191. Kahan, B.D., and Camardo, J.S. (2001) Rapamycin: Clinical results and future opportunities. Transplantation 72:1181-1193. Kallen, J. A., Sedrani, R., and Cottens S. (1996) X-ray crystal structure of 28-0 20 methylrapamycin complexed with FKBP1 2: Is the cyclohexyl moiety part of the effector domain of rapamycin? Journal of the American Chemical Society 118: 5857-5861. Kawasome, H., Papst, P., Webb, S., Keller, G.M., Johnson, G.L., Gelfand, E.W., and Terada, N. (1998) Targeted disruption of p70* defines its role in protein 25 synthesis and rapamycin sensitivity. Proceedings of the National Academy of Sciences of the United States of America 95: 5033-5038. Khaw, .E., B6hm, GA., Metcalfe, S., Staunton, J., and Leadlay, P.F. (1998) Mutational biosynthesis of novel rapamycins by a strain of Streptomyces hygroscopicus NRRL 5491 disrupted in rapL, encoding a putative lysine 30 cyclodeaminase. Journal of Bacteriology 180: 809-814. Kieser, T., Bibb, M.J., Buttner, M.J., Chater, K.F., and Hopwood, D.A. (2000) Practical Streptomyces Genetics, John Innes Foundation, Norwich. Kirby, B., and Griffiths,C.E.M. (2001) Psoriasis: the future. British Journal of Dermatology 144:37-43. 35 Kirchner, G.I., Winkler, M., Mueller L., Vidal, C., Jacobsen, W., Franzke, A., Wagner, 148 S., Blick, S., Manns M.P., and Sewing K.-F.(2000) Pharmacokinetics of SDZ RAD and cyclosporin including their metabolites in seven kidney graft patients after the first dose of SDZ RAD. British Journal of Clinical Pharmacology 50:449-454.

5 K6nig, A.,'Schwecke, T., Molner, I., Bohm, G., Lowden, P.A.S., Staunton, J., and Leadlay, P.F. (1997) The pipecolate-incorporating enzyme for the biosynthesis of the immunosuppressant rapamycin. Nucleotide sequence analysis, disruption and heterologus expression of rapP from Streptomyces hygroscopicus. European Journal of Biochemistry 247: 526-534. 10 Kunz, J., Loeschmann, A., Deuter-Reinhard, M., and Hall, M.N. (2000) FAP1, a homologue of human transcription factor NF-X1, competes with rapamycin for binding to FKBP12 in yeast. Molecular Microbiology 37: 1480-1493. Kuo, C.J., Chung, J.K., Fiorentino, D.F., Flanagan, W.M., Blenis, J., and Crabtree, G.R. (1992) Rapamycin selectively inhibits interleukin-2 activation of p 70 S6 15 kinase. Nature 358: 70-73. Lee, M.H. Pascopella, L, Jacobs, W.R., Jr and Hatfull, G.F (1991). Site specific integration of mycobacteriophage L5: integration-proficient vectors for Mycobacterium smegmatis, Mycobacterium tuberculosis and Bacille Calmette-Guerin. Proc. Nat). Acad. Sci. USA, 88:3111-3115. 20 Lee MH, Pascopella L, Jacobs WR Jr, Hatfull GF. (1991), Site-specific integration of mycobacteriophage~L5: integration-proficient vectors for Mycobacterium smegmatis, Mycobacterium tuberculosis, and bacille Calmette-Guerin. Proc Natl Acad Sci U S A.; 88:3111-5. Liang, J., Choi, J., and Clardy, J. (1999) Refined structure of the FKBP12-rapamycin 25 FRB ternary complex at 2.2 A resolution. Acta Crystallographica Section D Biological Crystallography 55: 736-744. Lomovsikaya, N., Fonstein, L., Ruan, X., Stassi, D., Katz, L., and Hutchinson, C.R. (1997) Gene disruption and replacement in the rapamycin-producing Stieptomyces hygroscopicus strain ATCC 29253. Microbiology-Uk 143: 875 30 883. Lowden, P.A.S., Bohm, G., Staunton, J., and Leadlay, P.F. (1996) The nature of the starter unit for the rapamycin polyketide sythase. Angewandte Chemie 35: 2249-2251. Lowden, P. A. S., (1997) Ph.D. Dissertation, University of Cambridge. "Studies on the 35 biosynthesis of rapamycin". 149 Lowden, P.A.S., Wilkinson, B., B6hm, G.A., Handa, S., Floss, H.G., Leadlay, P.F., and Staunton, J. (2001) Origin and true nature of the starter unit for the rapamycin polyketide synthase. Angewandte Chemie-Intemational Edition 40: 777-779. 5 Luengo, J.l., Yamashita,.D.S., Dunnington, D., Beck, A.K., Rozamus, L.W., Yen, H.K., Bossard, M.J., Levy, M.A., Hand, A., Newmantarr, T., Badger, A., Faucette, L., Johnson, R.K., Dalesslo, K., Porter, T., Shu, A.Y.L, Heys, R., Choi, J.W., Kongsaeree, P., Clardy, J., and Holt, D.A. (1995) Structure Activity Studies of Rapamycin Analogs - Evidence That the C-7 Methoxy 10 Group Is Part of the Effector Domain and Positioned at the Fkbpl 2-Frap Interface. Chemisby & Biology 2: 471-481. Lyons, W.E., George, E.B., Dawson, T.M., Steiner, J.P., and Snyder, S.H. (1994) Immunosuppressant FK506 promotes neurite outgrowth in cultures of PC12 cells and sensory ganglia. Proceedings of the NationalAcademy of Sciences 15 of the United States of America 91:3191-3195. MacNeil, D.J., Gewain, KM., Ruby, C.L, Dezeny, G., Gibbons, P.H., and MacNeil, T. (1992) Analysis of Streptomyces avermitilis genes required for avermectin biosynthesis utilizing a novel integration vector. Gene 111: 61-68. Marahiel, M.A., Stacheihaus, T., and Mootz, H.D. (1997) Modular peptide 20 synthetases involved in nonribosomal peptide synthesis. Chemical Reviews 97: 2651-2673. Matsuura, M., Noguchi, T., Yamaguchi, D., Aida, T., Asayama, M., Takahashi, H. and Shirai, M. (1996). The sre gene (ORF469) encodes a site-specific recombinase responsible for integration of the R4 phage genome. J Bact. 25 178(11):3374-3376. McAlpine, J. B,.Swanson S. J., Jackson, M., Whittem, D.N. (1991). Revised NMR assignments for rapamycin. Journal of Antibiotics 44: 688-690. Meo, T. In "Immunological Methods, L. Lefkovits and B. Pemis, Eds., Academic Press, N.Y. pp. 227-239 (1979). 30 Molner, I., Aparicio, J.F., Haydock, S.F., Khaw, L.E., Schwecke, T., K6nig, A., Staunton, J., and Leadlay, P.F. (1996) Organisation of the biosynthetic gene cluster for rapamycin in Streptomyces hygroscopicus: analysis of genes flanking the polyketide synthase. Gene 169: 1-7. Morice, M.C., Serruys, P.W., Sousa, J.E., Fajadet, J., Ban Hayashi, E., Pern, M., 35 Colombo, A., Schuler, G., Barragan, P., Guagliumi, G., Molnar, F., Falotico, 150 R. (2002). RAVEL Study Group. Randomized Study with the Sirolimus Coated Bx Velocity Balloon-Expandable Stent in the Treatment of Patients with de Novo Native Coronary Artery Lesions. A randomized comparison of a sirolimus-eluting stent with a standard stent for coronary revascularization. N. 5 Eng.l J. Med. 346(23):1773-80. Motamedi, H., Shaflee, A, Cai, S.J., Streicher, S.L., Arison, B.H., and Miller, R.R. (1996) Characterization of methyltransferase and hydroxylase genes Involved in the biosynthesis of the immunosuppressants FK506 and FK520. Joumal of Bacteriology 178: 5243-5248. 10 Motamedi, H., Cal, S.J., Shaflee, A., and Elliston, K.O. (1997) Structural organization of a multifunctional polyketide synthase involved in the biosynthesis of the macrolide immunosuppressant FK506. European Journal of Biochemistry 244: 74-80. Motamedi, H., and Shafiee, A. (1998) The biosynthetic gene cluster for the IS macrolactone ring of the immunosuppressant FK506. European Journal of Biochemistry 256: 528-534. Myckatyn, T.M., Ellis, RA., Grand, A.G., Sen, S.K., Lowe, J.B. 3rd, Hunter, D.A., Mackinnon, S.E. (2002). The effects of rapamycin in murine peripheral nerve isografts and allografts. 20 Plast. Reconstr. Surg. 109(7):2405-17. Nav6, B.T., Ouwens, D.M., Wthers, D.J., Alessi, D.R., and Sheperd, P.R. (1999) Mammalian target of rapamycin is a direct target for protein kinase B: identification of a convergence point for opposing effects of insulin and amino acid deficiency on protein translation. Biochemical Joumal 344:427-431. 25 Navia, M.A. (1996) Protein-drug complexes important for immunoregulation and organ transplantation. Current Opinion in Structural Biology 6: 838-847. NCCLS Reference Method for Broth Dilution Antifungal Susceptibility Testing for Yeasts: Approved Standard M27-A, vol. 17 No. 9. (1997). Nishida, H., Sakakibara, T., Aoki, F., Saito, T., Ichikawa, K., Inagaki, T., Kojima, Y., 30 Yamauchi, Y., Huang, L.H., Guadliana, M.A., Kaneko, T., and Kojima, N. (1995) Generation of novel rapamycin structures by microbial manipulations. Journal of Antibiotics 48: 657-666. Nielsen, J.B., Hsu, M.J., Byrne, K.M., and Kaplan, L. (1991) Biosynthesis of the immunosuppressant Immunomycin: the enzymology of pipecolate 35 incorporation. Biochemistry 30: 5789-5796. 151 Paget, M.S.B., Chamberlin, L, Atrih, A., Foster, S.J., and Buttner, M.J. (1999) Evidence that the extracytoplasmic function sigma factor 0 E is required for normal cell wall structure in Streptomyces coelicolorA3(2). Journal of Bacteriology 181: 204-211) 5 Paiva, N.L., Demain, A.L., and Roberts, M.F. (1991) Incorporation of acetate, propionate, and methionine into rapamycin By Streptomyces hygroscopicus. Journal of Natural Products 54: 167-177. Paiva, N.L., Demain, A.L., and Roberts, M.F. (1993) The immediate precursor of the nitrogen-containing ring of rapamycin is free pipecolic acid. Enzyme and 10 Microbial Technology 15: 581-585. Patterson, C.E., Schaub, T., Coleman, E.J., and Davies E.C. (2000) Developmental regulation of FKBP65. An ER-localized extracellular matrix binding-protein. Molecular Biology of the Cell 11:3925-3935. Pfeifer, BA, Admiraal, S.J., Gramajo, H., Cane, D.E., and Khosla, C. (2001) 15 Biosynthesis of complex polyketides in a metabolically engineered strain of E. coli. Science 291: 1790-1792. Powell, N., Till, S., Bungre, J., Corrigan, C. (2001). The immunomodulatory drugs cyclosporin A, mycophenolate mofetil, and sirolimus (rapamycin) inhibit allergen-induced proliferation and IL-5 production by PBMCs from atopic 20 asthmatic patients. J. Allergy Clin. Immunol. 108(6):915-7 Rabinovitch, A., Suarez-Pinzon, W.L., Shapiro, A.M., Rajotte, R.V., Power, R. (2002). Combination therapy with sirolimus and interleukin-2 prevents spontaneous and recurrent autoimmune diabetes in NOD mice.Diabetes. 51(3):638-45. 25 Raught, B., Gingras, A.C., and Sonenberg, N. (2001) The target of rapamycin (TOR) proteins. Proceedings of the National Academy of Sciences of the. United States of America 98: 7037-7044. Rawlings, B.J. (2001) Type I polyketide biosynthesis in bacteria (Part A). Natural Product Reports 18: 190-227. 30 Reather, J. A., (2000), Ph.D. Dissertation, University of Cambridge. "Late steps in the biosynthesis of macrocyclic lactones". Reitamo, S., Spuls, P., Sassolas, B., Lahfa, M., Claudy, A., Griffiths, C.E.; Sirolimus European Psoriasis Study Group. (2001). Efficacy of sirolimus (rapamycin) administered concomitantly with a subtherapeutlc dose of cyclosporin in the 35 treatment of severe psoriasis: a randomized controlled trial. Br. J. Dermatol. 152 145(3):438-45. Rosen, M.K., and Schreiber, S.L. (1992) Natural products as probes of cellular function: studies of immunophilins. Angewandte Chemie-international Edition in English 31: 384-400. 5 Roymans, D., and Slegers, H. (2001) Phosphaditidylinositol 3-kinases in tumor progression. European Journal of Biochemistry 268:487-498. Ruan, X.A., Stass, D., Lax, S.A., and Katz, L. (1997) A second type-I PKS gene cluster isolated from Streptomyces hygroscopicus ATCC 29253, a rapamycin producing strain. Gene 203: 1-9. 10 Salituro, G.M., Zink, D.L., Dahl, A., Nielsen, J., Wu, E., Huang, L., Kastner C., Dumont, F. (1995) Meridamycin: a novel nonimmunosuppressive FKBP12 ligand from Streptomyces hygroscopicus. Tetrahydron letters 36: 997-1000. Schwarzer, D., and Marahiel, M.A. (2001) Multimodular biocatalysts for natural product assembly. Naturwissenschaften 88: 93-101. 15 Sambrook, J., Fritsch, E.F., and Maniatis, T. (1989) Molecular cloning: a laboratory manual, 2nd ed. Cold Spring Harbor Laboratory Press, N.Y. Schreiber, S.L., and Crabtree, G.R. (1992) The mechanism of action of cyclosporine A and FK506. Immunology Today 13: 136-142. Schwecke, T., Aparicio, J.F., Moln~r, I., K6nig, A., Khaw, L.E., Haydock, S.F., 20 Ollynyk, M., Caffrey, P., Cort6s, J., Lester, J.B., Bdhm, G.A., Staunton, J., and Leadlay, P.F. (1995) The biosynthetic gene cluster for the polyketide immunosuppressant rapamycin. Proceedings of the National Academy of Sciences of the United States of America 92: 7839-7843. Sedrani, R., Cottens, S., Kallen, J., and Schuler, W. (1998) Chemical modifications of 25 rapamycin: the discovery of SDZ RAD. Transplantation Proceedings 30: 2.192-2194. Sehgal;-S.N., Baker, H., and Vbzina, C. (1975) Rapamycin (AY-22,989), a new antifungal antibiotic II. Fermentation, isolation and characterization. The Journal of Antibiotics 28: 727-733. 30 Shepherd, P.R , Withers, D.J., and Siddle K. (1998) Phosphoinositide 3-kinase: the key switch mechanism in insulin signalling. Biochemical Joumal 333: 471 490. Shima, J., Hesketh, A., Okamoto, S., Kawamoto, S., and Ochi, K. (1996) Induction of actinorhodin production by rpsL (encoding ribosomal protein S12) mutations 35 that confer streptomycin resistance in Streptomyces lividans and 153 Streptomyces coelicolorA3(2). Journal of Bacteriology 178: 7276-7284. Sigal, N.H., and Dumont, F.J. (1992) Cyclosporine A, FK-506, and rapamycin: pharmacological probes of lymphocyte signal transduction. Annual Review of Immunology 10: 519-560. 5 Sieuwerts, A.M., Kijn, J.G., Peters, H.A., Foekens, J.A. (1995). The MTT tetrazolium salt assay scrutinized: how to use this assay reliably to measure metabolic activity of cell cultures In vitro for the assessment of growth characteristics, IC50-values and cell survival. Eur. J Clin. Chem. Clin. Biochem. 33(11):813 23. 10 Smovkina, T., Mazodier, P., Boccard, F., Thompson, C.J. and Guerineau, M. (1990) Contstruction of a series of pSAM2-based integrative vectors for use in actinomycetes. Gene 94: 53-59. SOULILLOU, J.P., CARPENTERf C.B., LUNDIN, A.P. and STROM, T.B. (1975) Augmentation of proliferation and in vitro production of cytotoxic cells by 2-ME 15 In the rat J Immunol. 115(6):1566-71. Staunton, J., and Weissman, K.J. (2001) Polyketide biosynthesis: a millennium review. Natural Product Reports 18: 380-416. Steiner, J.P., Hamilton, G.S., Ross, D. T., Valentine, H.L., Guo, H., Connolly, M.A., Liang, S., Ramsey, C., Li, J.-H.J., Huang, W., Howorth, P., Soni, R., Fuller, 20 M., Sauer, H., Nowotnik, A.C., and Suzdak, P.D. (1997) Neutrophic immunophilin ligands stimulate structural and functional recovery in neurodegenerative animal models. Proceedings of the National Academy of Sciences of the United States of America 94:2019-2024. Tang, S.J., Reis, G., Kang, H., Gingras, A.-C., Sonenberg, N., and Schuman, E.M. 25 (2002) A rapamycin-sensitive signaling pathway contributes to long-term synaptic plasticity in the hippocampus. Proceedings oFthe National Academy bf Sciences of the United States of America 1:467-472. Van Duyne, G.D., Standaert, R.F., Karplus, P.A., Schreiber, S.L,.and Clardy, J. (1993) Atomic structures of the human immunophilin FKBP-12 complexes 30 with FK506 and rapamycin. Journal of Molecular Biology 229: 105-124. Van Mellaert, L., Mel, L., Lammertyn, E., Schacht, S., and Ann6, J..(1998) Site specific integration of bacteriophage VWB genome into Streptomyces venezuelae and construction of a VWB-based Integrative vector. Microbiology 144:3351-3358. 35 V6zina, C., Kudelski, A., and Sehgal, S.N. (1975) Rapamycin (AY-22,989), a new 154 antifungal antibiotic. 1. Taxonomy of the producing streptomycete and isolation of the active principle. The Journal of Antibiotics 28: 721-726. Vilella-Bach, M., Nuzzi, P., Fang, Y.M., and Chen, J. (1999) The FKBP12-rapamycin binding domain is required for FKBP12-rapamycin-associated protein kinase 5 activity-and G 1 progression. Journal of Biological Chemistry 274: 4266-4272. Waller, J.R., and Nicholson, M.L. (2001) Molecular mechanisms of renal allograft fibrosis. British Journal of Surgery 88:1429-1441. Warner, L.M., Adams, L.M., Chang, J.Y., Sehgal, S.N. (1992). A modification of the in vivo mixed lymphocyte reaction and rapamycin's effect in this model.Clin. 10 Immunol. Immunopathol. 64(3):242-7. Weber, T., and Marahiel, MA (2001) Exploring the domain structure of modular nonribosomal peptide synthetases. Structure 9: R3-R9 Welch, J. T. and Seper, K., W., (1988), J. Org. Chem., 53, 2991-2999 Wilkinson, B., Foster, G., Rudd, B.A.M., Taylor, N.L., Blackaby, A.P., Sidebottom, 15 P.J., Cooper, D.J., Dawson, M.J., Buss, A.D., Gaisser, S., B6hm, I.U., Rowe, C.J., Cort6s, J., Leadlay, P.F. and Staunton, J. (2000). Novel octaketide macrolides related to 6-deoxoerythronolide B provide evidence for iterative operation of the erythromycin polyketide synthase. Chemistry & Biology 7: 111-117. 20 Wong, G.K., Griffith, S., Kojima, I., and Demain, A.L. (1998) Antifungal activities of rapamycin and its derivatives, prolylrapamycin, 32-desmethyrapamycin, and 32-desmethoxyrapamycin. Journal of Antibiotics 51: 487-491. Wu, K., Chung, L., Revill, W.P., Katz, L., and Reeves, C.D. (2000) The FK520 gene cluster of Streptomyces hygroscopicus var. ascomyceticus (ATCC 14891) 25 contains genes for biosynthesis of unusual polyketide extender units. Gene 251: 81-90. Yem, AW., Tomasselli, A.G., Heinrikson, R.L, Zurcher-Neely, H., Ruff, V.A., Johnson, R.A., and Deibel, M.R. (1992) The Hsp56 component of steroid receptor complexes binds to immobilized FK506 and shows homology to 30 FKBP-12 and FKBP-13. Journal of Biological Chemistry 267: 2868-2871. Yu, K., Toral-Barza, L., Discafani, C., Zhang, W.G., Skotnicki, J., Frost, P., Gibbons, J.J. (2001) mTOR, a novel target in breast cancer the effect of CCI-779, an mTOR Inhibitor, in preclinical models of breast cancer. Endocrine-Related Cancer 8:249-258. 35 Zhu, J., Wu J., Frizell, E., Liu, S.L., Bashey, R., Rubin, R., Norton, P., Zem, M.A. 155 (1999). Rapamycin inhibits hepatic stellate cell proliferation in vitro and limits fibrogenesis in an in vivo model of liver fibrosis. Gastroenterology. 117(5):1198-204. 5 The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as an acknowledgment or admission or any form of suggestion that that prior publication (or information derived from it) or known matter forms part of the common general 10 knowledge in the field of endeavour to which this specification relates. Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" and "comprising", will be understood to imply the inclusion of a stated integer or step or 15 group of integers or steps but not the exclusion of any other integer or step or group of integers or steps. 156

Claims (6)

1. A compound of the formula: R Me R7 Me O 0 OH O Me R2 M "Me R3 N Z OH y R6 R 4 OMe R5 wherein R9 R1 =RR9R 131~ C R 8 D E R8 R F G 5 R 2 = H, alkyl, halo, hydroxyl, or thiol; R 3 = H, alkyl, halo, hydroxyl, or thiol; R4 = H, alkyl, halo, hydroxyl, or thiol; 10 R 5 = OMe; R 6 = OMe, R7= CH 2 CH 3 or CH 2 CH=CH 2 ; R 8 = OH ; Rg = H, OH, halo, thiol, or alkyl; 5 Z = keto or CH 2 ; X=X'=bond; or X=bond and X'=CH 2 .

2. A compound of the formula: 157 R Me R Me O 0 OH O Me R2 'Me R 3 N Z OH 0Me R 5 wherein R R R1 = R8 R R8 A 13 C R 8 R R 8 R9 D E R8R R F G R2= H, alkyl, halo, hydroxyl, or thiol; R 3 = H, alkyl, halo, hydroxyl, or thiol; 5 R = H, alkyl, halo, hydroxyl, or thiol; R 5 = OMe; R= OMe; R= CH 2 CH 3 or CH 2 CH=CH 2 ; R= OH ; 0 R 9 = H or alkyl; Z = keto or CH 2 ; X = bond; and X'= CH 2 .

3. A compound according to claim 1or 2: RR 9 R 8 - R 8 15 wherein R 1 = R or where R 8 = OH and R 9 = halo. 158

4. A compound according to claim 1, 2 or 3 which is selected from the group consisting of: 31-desmethoxy-FK520, 31-0-desmethyl-32-dehydroxy-FK520, 31-desmethoxy

31-methyl-FK520, 31-0-desmethyl-32-dehydroxy-32-methyl-FK520, 31-0-desmethyl

32-dehydroxy-32-tert-butyl-FK520, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29 (hydroxy-cycloheptyl)-FK520, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy norbornyl)-FK520, 9-deoxo-31-desmethoxy-FK520, 9-deoxo-31-0-desmethyl-32 dehydroxy-FK520, 9-deoxo-31 -desmethoxy-31 -methyl-FK520, 9-deoxo-31-0 desmethyl-32-dehydroxy-32-methyl-FK520, 9-deoxo-31-0-desmethyl-32-dehydroxy 32-tert-butyl-FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy norbornyl)-FK520, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl) FK520, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbornyl)-FK5 2 0, 8 deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-prolyl FK520, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbornyl) prolyl-FK520, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-3 hydroxy-prolyl-FK520, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy norbornyl)-3-hydroxy-prolyl-FK520, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl) 28-(hydroxy-cycloheptyl)-3-hydroxy-prolyl-FK5 2 0, 8-deoxo-28-de(3-methoxy-4 hydroxy-cyclohexyl)-28-(hydroxy-norbornyl)-3-hydroxy-prolyl-FK520, 28-de(3 ) methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-4-hydroxy-prolyl-FK520, 28 de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbornyl)-4-hydroxy-prolyl-FK520, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-4 hydroxy-prolyl-FK520, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy norbornyl)-4-hydroxy-prolyl-FK520. 5 5. A compound according to claim 4 which is selected from the group consisting of: 31 desmethoxy-31-methyl-FK520, 31-0-desmethyl-32-dehydroxy-32-tert-butyl-FK520, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-cycloheptyl)-FK520, 29-de(3 methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-norbornyl)-FK520, 9-deoxo-31 0 desmethoxy-31-methyl-FK520, 9-deoxo-31-0-desmethyl-32-dehydroxy-32-tert-butyl FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-cycloheptyl) FK520, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-norbornyl) FK520, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-FK520, 28 de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbornyl)-FK520. 35 159 6. A compound according to claim 1, 2 or 3 which is selected from the group consisting of: 31-desmethoxy-FK506, 31-0-desmethyl-32-dehydroxy-FK506, 31-desmethoxy 31-methyl-FK506, 31-0-desmethyl-32-dehydroxy-32-methyl-FK506, 31-0-desmethyl 32-dehydroxy-32-tert-butyl-FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29 (hydroxy-cycloheptyl)-FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy norbornyl)-FK506, 9-deoxo-31 -desmethoxy-FK506, 9-deoxo-31-0-desmethyl-32 dehydroxy-FK506, 9-deoxo-31 -desmethoxy-31 -methyl-FK506, 9-deoxo-31-0 desmethyl-32-dehydroxy-32-methy-FK506, 9-deoxo-31-0-desmethyl-32-dehydroxy 32-tert-butyl-FK506, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy cycloheptyl)-FK506, 9-deoxo-29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy norbornyl)-FK506, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl) FK506, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbornyl)-FK506, 8 deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-prolyl FK506, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbornyl) prolyl-FK506, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)- 3 hydroxy-prolyl-FK506, 28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy norbornyl)-3-hydroxy-prolyl-FK506, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl) 28-(hydroxy-cycloheptyl)-3-hydroxy-prolyl-FK506, 8-deoxo-28-de(3-methoxy-4 hydroxy-cyclohexyl)-28-(hydroxy-norbornyl)-3-hydroxy-prolyl-FK506, 28-de(3 ) methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-4-hydroxy-prolyl-FK506, 28 de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-norbornyl)- 4 -hydroxy-prolyl FK506, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy-cycloheptyl)-4 hydroxy-prolyl-FK506, 8-deoxo-28-de(3-methoxy-4-hydroxy-cyclohexyl)-28-(hydroxy norbornyl)-4-hydroxy-prolyl-FK506. 25 7. A compound according to claim 6 which is selected from the group consisting of: 31 desmethoxy-31-methyl-FK506, 31-0-desmethyl-32-dehydroxy-32-tert-butyl-FK506, 29-de(3-methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-cycloheptyl)-FK506, 29-de(3 methoxy-4-hydroxy-cyclohexyl)-29-(hydroxy-norbornyl)-FK50 6 . 30 8. A method of treatment of cancer, fungal infections, autoimmune, proliferative and/or hyperproliferative diseases, the maintenance of immunosuppression, the treatment of diabetes, acute or chronic rejection of an organ or tissue transplant, asthma, 35 tumours, psoriasis, eczema, rheumatoid arthritis, fibrosis, allergies or for use in relation to antifibrotic, neuroregenerative and/or anti-angiogenic mechanisms, which comprises administering to a subject an effective amount of a compound according 160 to any one of claims 1 to 7. 9. Use of a compound according to any one of claims 1 to 7 in the manufacture of a medicament for the treatment of cancer, fungal infections, autoimmune, proliferative and/or hyperproliferative diseases, the maintenance of immunosuppression, the treatment of diabetes, acute or chronic rejection of an organ or tissue transplant, asthma, tumours, psoriasis, eczema, rheumatoid arthritis, fibrosis, allergies for use in relation to antifibrotic, neuroregenerative and/or anti-angiogenic mechanisms. 10. A compound of the formula 1i Me R7 M e. o O OHO Me R 2 'Me R OH R4 0 Me R 5 wherein R 1 represents R21 R22 R23 R24 R 25 R 2 6 where Y = bond or CH 2 and R 21 , R 22 , R 23 , R 24 , R 25 and R 2 6 may be the same or different and may independently be Cl, F, OH, SH, H, 5 alkyl, CN, Br, R 27 , OR 27 , C(O)R 27 or HNR 2 7 where R 27 is a C1-C4 alkyl; R 21 and R 23 , R 22 and R 24 , R 23 and R 25 , R 24 and R 26 , R 21 and R 25 , or R 22 and R 2 6 may be joined as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link, R 21 and R 22 , R 23 and R 2 4 or R 2 5 and R 2 6 may be taken together as a ketone; provided that no more than 4 of R 21 , R 22 , R 23 , R 24 , R 2 5 or R 26 may be Cl; no 20 more than 2 of R 21 , R 22 , R 23 , R 24 , R 2 5 or R 2 6 may be HNR 2 7 : no more than 2 of R 21 , 161 R 22 , R 23 , R 24 , R 25 or R 26 may be SH and both R groups from one carbon on the ring are not OH; or wherein R 1 represents R31 R32 \\J% R 33 R34 where Y = bond or CH 2 , R 3 1 and R 32 , may be the same or different and may independently be F, Cl, OH, SH, H, CN, OR 3 7 , C(O) R 37 , or NHR 37 wherein R 37 is a C1-C4 alkyl; R 31 and R 32 may also be taken together to form a ketone, a spirocyclopropyl group or with -OCH 2 -, -CH 2 0-, -SCH 2 - or -CH 2 S furthermore R 3 3 , and R 34 may be the same or different and may independently be F, Cl, Br, OR 37 , H or CN; provided that both R groups from one carbon on the ring are not OH; or wherein R 1 represents R 42 R 41 R 42 R 41 K L R43 R43 R 45 R 45 R R46 or R 46 where R 41 , R 42 , R 43 , R 44 , R 45 or R 46 may be the same or different and may independently be Cl, F, OH, SH, H, alkyl, CN, Br, R 47 , OR 47 , C(O)R 4 7 or HNR 47 where R 47 is a C1-C4 alkyl; 5 R 41 and R 43 , R 42 and R 44 , R 43 and R 45 , R 44 and R 46 , R 41 and R 4 5 , or R 42 and R 4 6 may be joined as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link , R 43 and R 44 or R 45 and R 46 may be taken together as a ketone;provided that both R groups from one carbon on the ring are not OH; or wherein R 1 represents 162 R 52 R 51 M R 53 Z R54 _where R 51 and R 52 , may be the same or different and may independently be F, Cl, OH, SH, H, CN, OR 57 , C(O)R 57 , or NHR 57 wherein R 57 is a C1-C4 alkyl, R 51 and R 52 may also be taken together to form a ketone, a spirocyclopropyl group or with -OCH2-, -CH 2 0-, -SCH 2 - or -CH 2 S-; furthermore R 53 , and R 54 may be the same or different and may independently be F, Cl, Br, OR 57 , H or CN; provided that both R groups from one carbon on the ring are not OH; or wherein R 1 represents R61 R 62 111111" Z I N R63 R64 R65 where Y = bond or CH 2 ;and R 61 , R 62 , R 63 , R 64 or R 65 may be the same or different and may independently be Cl, F, OH, SH, H, alkyl, CN, ) Br, R5 7 , OR 67 , C(O)R 67 or HNR 6 7 where R 67 is a C1-C4 alkyl, Rr 1 and R 63 , R 62 and R 64 , may be taken together as a ketone or linked as either a substituted or unsubstituted methylene link, an ether link, a thia link or an amino link where R 61 and R 62 or R 63 and R 64 are linked as a spiro-cyclopropyl group or with -OCH 2 - or -CH 2 0- or -SCH 2 - or CH 2 S-, R 65 may be F, Cl, OR 67 , H or CN; provided that no more than two of R 61 , R 62 , 5 R 63 , R 64 or R 65 are SH and that both R groups attached to one carbon are not OH; or wherein R 1 represents R71 R72"I R 7 3 0 R74 where R 71 , R 72 , R 73 and R 7 4 may be the same or different and may independently be Cl, F, OH, SH, H, alkyl, CN, Br, R 77 , OR 77 , C(O)R 7 7 or HNR 77 where R 77 is a C1-C4 alkyl, R 71 and R 7 2 or R 7 3 and R 74 may be 20 taken together to form a ketone, provided that two R groups attached to the same carbon are not both OH; R2 = H, alkyl, halo, hydroxyl or thiol; 163 R 3 = H, alkyl, halo, hydroxyl or thiol; R4 = H, alkyl, halo, hydroxyl or thiol; R5 = OMe, Me or H; R 6 = OMe, Me or H; R7 = CH 2 CH 3 or CH 2 CH=CH 2 ; R 8 = OH; R9 = H, OH, halo, thiol or alkyl; Z = keto or CH 2 ; Y = bond or CH 2 ; X=X'=bond; or X=bond and X'= CH 2 . 11. A compound according to claim 10 wherein R 1 is structure I, K, L, N or 0; and two of R 21 , R 22 , R 23 , R 24 , R 25 and R 26 are F, one of R 21 , R 22 , R 23 , R 24 , R 25 and R 26 is OH and the remainder of R 21 , R 22 , R 23 , R 24 , R 25 and R 26 are H; or two of R 41 , R 42 , R 43 , R 44 , R 4 5 and R 46 are F, one of R 41 , R 42 , R 43 , R 44 , R 45 and R 46 is OH and the remainder of R 41 , R 42 , R 43 , R 44 , R 4 5 and R 4 6 are H; or two of Rr 1 , R 62 , R 63 , R 64 and R 6 5 are F, one of R 61 , R 62 , R 63 , R 64 and R 65 is OH and the remainder of R 61 , R 62 , R 63 , R 64 and R 65 are H; or two of R 71 , R 72 , R 7 3 and R 74 are F, one of R 71 , R 72 , R 73 and R 74 is OH and the ) remainder of R 71 , R 72 , R 73 and R 74 are H. 12. A compound according to claim 10 wherein R 1 is structure 1, K, L, N or 0; and one of R 21 , R 22 , R 23 , R 24 , R 25 and R 26 is SH, F, Cl or alkyl (wherein the alkyl group shall contain no more than 4 carbon atoms and have a linear length of no greater .5 than 3 carbon atoms), one of R 21 , R 22 , R 23 , R 24 , R 2 5 and R 26 is OH (not originating from the same carbon atom as the SH, F, Cl or alkyl group) and the remainder of R 2 1 , R 22 , R 23 , R 24 , R 2 5 and R 2 6 are H; or one of R 41 , R 42 , R 4 3 , R 44 , R 45 and R 46 is SH, F, CI or alkyl (wherein the alkyl group shall contain no more than 4 carbon atoms and have a linear length of no greater 30 than 3 carbon atoms), one of R 41 , R 42 , R 43 , R 44 , R 45 and R 46 is OH (not originating from the same carbon atom as the SH, F, CI or alkyl group) and the remainder of R 41 , R 42 , R 43 , R 44 , R 45 and R 46 are H; or one of R 61 , R 62 , R 63 , R 64 and R 65 is SH, F, CI or alkyl (wherein the alkyl group shall contain no more than 4 carbon atoms and have a linear length of no greater than 3 35 carbon atoms), one of R 61 , R 62 , R 63 , R 64 and R 65 is OH (not originating from the same carbon atom as the SH, F, Cl or alkyl group) and the remainder of R 61 , R 62 , Re 3 , R 64 and R 65 are H; or 164 one of R 71 , R 7 2 , R 73 and R 7 4 is SH, F, Cl or alkyl (wherein the alkyl group shall contain no more than 4 carbon atoms and have a linear length of no greater than 3 carbon atoms), one of R 71 , R 7 2 , R 73 and R 7 4 is OH (not originating from the same carbon atom as the SH, F, Cl or alkyl group) and the remainder of R 71 , R 7 2 , R 7 3 and R 74 are H. 13. A compound according to claim 10 wherein R 1 is structure 1, K, L, N or 0; and two of R 21 , R 22 , R 23 , R 24 , R 2 s and R 26 are OH, one of R 21 , R 22 , R 23 , R 24 , R 25 and R 2 e is Cl or F and the remainder of R 21 , R 22 , R 23 , R 24 , R 25 and R 2 6 are H; or two of R 41 , R 42 , R 43 , R 44 , R 45 and R 46 are OH, one of R 41 , R 42 , R 43 , R 44 , R 45 and R 46 is Cl or F and the remainder of R 4 1 , R 42 , R 43 , R 44 , R 4 5 and R 46 are H; or two of R 61 , R 62 , R 63 , R 64 and R 65 are OH, one of R 61 , R 62 , R 63 , R 64 and R 65 is Cl or F and the remainder of R 6 1 , R 62 , R 63 , R 64 and R 65 are H; or two of R 71 , R 7 2 , R 73 and R 7 4 are OH, one of R 71 , R 7 2 , R 7 3 and R 7 4 is Cl or F and the 5 remainder of R 71 , R 7 2 , R 73 and R 74 are H. 14. A compound according to claim 10 wherein R 1 is structure N or 0; and one of R 61 , R5 2 , R 63 , R 6 4 and R 65 is OH and the remainder of R 61 , R 62 , R 63 , R 64 and R 65 are H; or one of R 71 , R 7 2 , R 7 3 and R 74 is OH and the remainder of R 71 , R 7 2 , R 7 3 and R 74 are H. 15. A compound according to claim 10 wherein R 1 is structure 1, K , L, N or O; and two of R 21 , R 22 , R 23 , R 24 , R 2 5 and R 2 6 are OH and the remainder of R 21 , R 22 , R 23 , R 24 , R 25 and R 26 are H; or 25 two of R 41 , R 42 , R 43 , R 44 , R 4 5 and R 46 are OH and the remainder of R 41 , R 4 2 , R 43 , R 44 , R 45 and R 46 are H; or two of R 61 , R 62 , R 63 , R 64 and R 65 are OH and the remainder of R 61 , R 62 , R 63 , R 64 and R 65 are H; or two of R 71 , R 7 2 , R 73 and R 74 are OH and the remainder of R 71 , R 7 2 , R 7 3 and R 74 are H. 30 16. A compound according to claim 10 wherein R 1 is structure J or M; and one of R 33 and R 34 is F, Cl or alkyl (wherein the alkyl group shall contain no more than 4 carbon atoms and have a linear length of no greater than 3 carbon atoms), one of R 3 1 and R 32 is OH and the remainder of R 3 1 , R 32 , R 33 and R 3 4 are H; or 35 one of R 5 1 , R 52 , R 53 and R 54 is F, Cl or alkyl (wherein the alkyl group shall contain no more than 4 carbon atoms and have a linear length of no greater than 3 carbon atoms), one of R 51 , R 52 , R 53 and R 54 is OH (not originating from the same carbon 165 atom as the SH, F, CI or alkyl group) and the remainder of R 51 , R 52 , R 53 and R 5 4 are H. 17. A method of generating a compound according to claim 10, said method comprising: (a) generating a recombinant strain in which at least the rapK homologue has been deleted or inactivated; and (b) feeding a non-natural starter unit to said strain. 18. A method of treatment of cancer, fungal infections, autoimmune, proliferative and/or hyperproliferative diseases, the maintenance of immunosuppression, the treatment of diabetes, acute or chronic rejection of an organ or tissue transplant, asthma, tumours, psoriasis, eczema, rheumatoid arthritis, fibrosis, allergies or for use in relation to antifibrotic, neuroregenerative and/or anti-angiogenic mechanisms, which comprises administering to a subject an effective amount of a compound according to any one of claims 10-16. 19. Use of a compound according to any one of claims 10-16 in the manufacture of a medicament for the treatment of cancer, fungal infections, autoimmune, proliferative and/or hyperproliferative diseases, the maintenance of immunosuppression, the ) treatment of diabetes, acute or chronic rejection of an organ or tissue transplant, asthma, tumours, psoriasis, eczema, rheumatoid arthritis, fibrosis, allergies, or for use in relation to antifibrotic, neuroregenerative and/or anti-angiogenic mechanisms. 5 166