Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D471/00—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00
  • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
  • C07D471/04—Ortho-condensed systems
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
  • C07K1/04—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length on carriers
  • C07K1/042—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length on carriers characterised by the nature of the carrier
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
  • C07K1/06—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length using protecting groups or activating agents
  • C07K1/061—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length using protecting groups or activating agents using protecting groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07K—PEPTIDES
  • C07K1/00—General methods for the preparation of peptides, i.e. processes for the organic chemical preparation of peptides or proteins of any length
  • C07K1/14—Extraction; Separation; Purification
  • C07K1/16—Extraction; Separation; Purification by chromatography
  • C07K1/22—Affinity chromatography or related techniques based upon selective absorption processes

Definitions

• the present invention relates to methods of solid-phase peptide synthesis and to compounds that can be used for such methods.
• it refers to peptidic compounds comprising a metal chelating moiety.
• peptides Whilst synthesis of small peptides (up to 30meres) is usually of no problem to SPPS techniques, there are limitations with peptides at a size of 40 up to 120 (or even more) amino acids. Their properties correspond much better to the term "small protein” than to the term “large peptide”: a) Peptides of such bigger size usually also have a secondary structure (e.g. helix, beta- sheet) and a tertiary structure (e.g. leucine-zipper, disulfide bridging of domains) to be constructed beyond synthesis of the linear amino acid sequence.
• secondary structure e.g. helix, beta- sheet
• tertiary structure e.g. leucine-zipper, disulfide bridging of domains
• metal affinity resins per se are known in the area of downstream processing of biotechnologically produced, recombinant biomolecules.
• Metal affinity chromatography has become popular as a tool for chromatographic purification of naturally occuring proteins from crude biological mixtures or fluids, in parallel to traditional comparable techniques such as ion exchange chromatography.
• Such purification strategy is described e.g. in EP-A-253303 and US-A-4877830 using agarose-derivatives containing iminodiacetate and nitrilotriacetate.
• peptides containing metal-affinity side chains were engineered with the intention to use the side-chain fixed transition metal complexes as luminescent labelling reagents for a given peptide (e.g. WO-A-9603651A1; EPA-A-0178450).
• P is the peptidyl part which optionally may comprise further non-peptidic moieties or protection groups
• X is a linker or amino acid protection group with the proviso that X is not an amino acid monomer or peptide
• L is a metal chelating group, X and L together constituing the anchoring part.
• anchoring part may be termed a molecular 'TAG' according to the present invention.
• formula I is not be construed as to refer to C-terminal linkage to a linear peptide but to any sort of N-terminal (N-), C-terminal (C-) or side chain linkage to such peptide.
• the activated solid phase is referred to and is construed in the present context, as a "metal affini resin", too.
• a further object of the present invention are such peptides of formula I, and their anchoring parts X-L, respectively. The methods and use of the present invention relating to such peptides apply likewise to said anchoring parts.
• the present invention relies on metal complexes for attaching a peptide structure, preferably a growing peptide, to an appropriate solid support or resin during SPPS, purification or refolding, preferably during SPPS.
• metal complexes can be used during the repetitive synthesis steps and allow e.g. of detaching the growing peptide chain during the coupling step for a segment condensation interlude and reattaching it for again before the following conventional SPPS steps.
• the same principle of anchoring the peptide chain reversibly to a solid support can be used to control and perform folding of a purified peptide product after synthesis.
• the product is purified and reattached to a metal affinity resin at a suitably diluted relation of a number of product molecules to resin surface, optionally in the further presence of denaturing agents or influences such as e.g. chaotropic salts, in particular urea, detergents, denaturing pH/temperature and/or suitable solvents. If chosen correctly, this will statistically avoid that product molecules can meet each other and thus lead to a preference for intramolecular instead of intermolecular folding (aggregation). Having been attached and purified, the product is then treated with a number of solvents which allow of a gradual re-folding of the molecule and support the correct intramolecular configuration of the peptide chains.
• denaturing agents or influences such as e.g. chaotropic salts, in particular urea, detergents, denaturing pH/temperature and/or suitable solvents.
• TAG's or anchoring parts which have to be understood as organic metal chelating groups combined with suitable linkers, them together making up for the anchoring part of the peptide .
• TAG's can be attached to amino acid side chains, carboxy- or amino-groups of a given peptide and introduce metal chelating properties to the site at which they are attached.
• Procedures for introduction, use and chemical cleavage of such TAG's are disclosed and assembled into a process of peptide synthesis, which includes the steps of synthesis of the peptide sequence, detachement from a metal-affinity resin by chemical cleavage, purification on a metal affinity resin, refolding on a metal affinity resin and chemical release of a TAG-free peptide at the end of the process.
• the metal coordination complex formed by the present invention here is characterized by strong chelation of the metal ion to the solid phase and easily reversible, reversible here meaning weaker, chelation with the peptide chain. Accordingly, and in contrast to Comely et al. (supra), firstly metal ions are attached to a solid phase and secondly the growing peptide chain is anchored to the solid phase. This ends up in elution of the peptide without substantial amounts of metal ions being attached to it.
• the peptide is a "growing peptide" and subject to peptide elongation procedures, preferably by FMOC chemistry. This implies that the peptide is protected both in susceptible side chains and N-terminally (and eventually C-terminally, where required).
• amino acid protection groups in particular amino acid side- chain protection groups, is well-known in the art and is described e.g. in Bodansky, M., Prinicples of Peptide Synthesis, 2 nd ed. , Springer Verlag Berlin/Heidelberg, 1993; further, details of Merrifield-type synthesis, coupling reagents, coupling additives and reaction conditions can be found therein.
• amino acid' as always meaning "a-amino acid in the present context, peptide 'backbone', 'a-amino' group and 'side chain' in respect to an amino acid or amino acid derivative is used in compliance with the respective IUPAC-IUB definition ( International Union of Pure and Applied Chemistry and International Union of Biochemistry/ Joint Commission on Biochemical Nomenclature, "Nomenclature and Symbolism for Amino Acids and Peptides", PureAppl. Chem, 56, 595-624 (1984)).
• the 'growing' peptide consists of at least one amino acid to which further suitably protected amino acids or oligopeptides, preferably protected di- or tripeptides comprising hmb- und pseudoproline dipeptides or dipeptides derivatives, or diglycidyl peptides, are added in cyclic or sequential reaction mode or scheme to elongate said peptide.
• Such sequential scheme is commonly termed 'Merrifield-type' solid phase synthesis.
• mono- or oligomeric amino acids are added to the N-terminus (N) of the "growing peptide" in a Merrif ⁇ eld type sequential reaction schedule, preferably in a strict (C?
• N) Merrifield-type sequential reaction schedule or scheme preferably a Merrifield reaction schedule based on Fmoc-protection group chemistry for the N-terminus.
• the mono- or oligomeric amino acids are/or comprise natural and/or unnatural amino acids such as e.g. D-amino acids or L-Nor-lysine for example.
• the appropriately protected amino acid derivatives or oligomeric fragments being attached in each cycle of the Merrifield-type sequential reaction schedule can be chosen freely.
• any support known to the skilled person in the art of peptide chemistry may be used for the present invention.
• the solid support is based on silica, glass or cellulose or a polymer selected from the group consisting of polystyrene resins crosslinked with divinylbenzene, melamine resins and polyvinyl alcohol-based resins.
• Said supports of the present invention are covalently derivatized with a suitable metal chelating ligand to constitute the solid phase capable of and being activated by the presence of metal ions according to the present invention.
• the suitably polymeric solid support contains ferromagnetic particles.
• separation of liquid and activated solid phase during synthesis cycles is achieved for example by sieving, size-based separation, centrifugation or magnetic particle separation technology.
• Reactive functional groups can be introduced to the solid support by means of reaction with pre-existing moieties of the solid support or - in the case of polymers - also by copolymerisation with suitably derivatized copolymers.
• each metal chelating ligand on the solid support and the chelating group L on the peptide comprises at least one nitrogen, oxygen, phosphor or sulfur atom which is able to establish a coordinative ligand-metal bond.
• the metal chelating ligands of the solid phase are, directly or by means of linker groups, covalently bound to the solid support. Suitable linker groups are for example amino, carboxy, methylene, oxy, methylenedioxy, polymethylenedioxy, ethylenedioxy and polyethylenedioxy groups.
• the chelating ligand or chelating group comprises 1 to 10 of said N,O,P or S- atoms.
• examples are carboxy, amino, phosphoryl, sulfonyl, heterocyclic nitrogen, aza, hydroxyl, mercapto.
• it is a nitrogen comprising group or moiety selected from the group consisting of amino, hydroxyl, carboxyl, mercapto, imidazolyl, iV-methylimidazolyl, aminopurinyl moieties, phenanthrolyl moieties, pyridyl moieties, bispyridyl moieties, terpyridyl moieties, triazacyclononanonyl moieties, tetraazacyclododecanyl moieties, iminodiacetic acid moieties, nitrilotriacetic acid moieties and ethylenediaminetetraacetic acid moieties.
• group or moiety selected from the group consisting of amino, hydroxyl, carboxyl, mercapto, imidazolyl, iV-methylimidazolyl, aminopurinyl moieties, phenanthrolyl moieties, pyridyl moieties, bispyridyl moieties,
• chelating groups or ligands are triphenylphosphine moieties, aminopurine moieties, preferably 6-aminopurine moieties, phthalocyanine moieties, 1,10-phenanthroline moieties, preferably 5-amino-l,10-phenanthroline moieties, terpyridine moieties, preferably 4'-amino-[2,2';6',2"]terpyridine moieties, triazacyclononane moieties, preferably [l,4,7]triazacyclononane moieties and tetraazacyclododecanyl moieties, preferably [ 1 ,4,7, 10]tetraazacyclododecane moieties.
• radical R is (a) H, C1-C4 alkyl or C2-C4 hydroxyalkyl, and wherein when Q is -CH2-,radical R can additionally be either (b.) allyl, benzyl or o- hydroxybenzyl or (c.) -(C2H3R'NR')y-CH2-pyridyl-Y with the proviso that each R' is H or CH3 and y is 0 or 1 or (d.) -(CH2) m -
• the aralkyl moiety may be any stereosiomer of methylpyridyl, which is picolyl, such as -2-picolyl, -3-picolyl or -4-picolyl, also routinely coined a- , ⁇ - and ?-picolyl, respectively.
• the picolylamines and in particular bis-picolylamine ligands provide very tight binding of the metal ions, allowing of paring such chelating ligand on the solid support with a still comparatively weaker but in absolute terms quite strong chelating group L on the peptide, allowing of reversible but tight attachment of the peptide to the activated solid phase.
• An example of such resin is Dowex M-4195 (Dow Chemicals, U.S.A.), a macroporous chelating resin consisting of a bis-2-picolylamine functionality attached to a styrene-divinylbenzene polymeric matrix.
• Dowex M-4195 is capable of removing a number of transition metal cations in the 3d series (Ni 5 Co 5 Fe) but shows a particular affinity for copper (Diniz et al., 'Uptake of heavy metals by chelating resins from acidic manganese chloride solution', Minerals and Metallurgical Processing 17, 217, 2000).
• the terms strong/weak refer to complex stability constants, of course.
• Particularly suitable for pairing with the preferred picolylamine ligands with which the solid phase M is decorated are 5-amino-, glycine-5-amino- or 5-amido-l,10-phenantrolines on the peptide side.
• Such combination is particularly preferred according to the present invention, as is shown exemplarily in Fig. 1.
• the complex metal cation M 2+ in such combination is Ni 2+ or Cu 2+ , most preferably it is Cu 2+ .
• an anchoring part of the peptide may comprise 1 to 10 of said nitrogen, heterocylic nitrogen, aza, azido, oxygen, phosphor or sulfur-containing chelating groups L, the latter which are preferably concatemerized, possibly with suitable spacers such as e.g. alkyl or polyethylenglycol chains. It may also be possible, according to the present invention, that the peptide may comprise more than one, preferably two different, anchoring parts.
• the coordinative bond of the metal chelating ligands of the activated solid phase to the metal ions is stronger than the coordinative bond of the anchoring part of the peptide, that is the chelating group L, to said metal ions in terms of complex stability constant.
• the chelating group L is selected from the group consisting of amino, hydroxyl, carboxyl, mercapto, imidazolyl, iV-methylimidazolyl, aminopurinyl moieties, phenanthrolyl moieties, pyridyl moieties, bispyridyl moieties, terpyridyl moieties, triazacyclononanonyl moieties, tetraazacyclododecanyl moieties, iminodiacetic acid moieties, nitrilotriacetic acid moieties and ethylenediaminetetraacetic acid moieties.
• the metal M n+ is selected from the group consisting of Mn 2+ , Cu 2+ , Ni 2+ , Co 2+ , Zn 2+ , Mg 2+ , Ca 2+ , Fe 2+ , Fe 3+ and lanthanide ions, particularly preferred M n+ is Cu 2+ , Ni 2+ , Co 2+ and Zn 2+ ', most preferably it is Cu 2+ OrNi 2+
• a competitive agent can be added to the anchored peptides in order to competitively detach the anchored part of the peptide from the activated solid phase.
• the competitive agent is added to the reagent mixture of the coupling step of a Merrifield-type reaction schedule.
• a suitable competitive chelating agent or ligand has about the same or weaker affinity for the free coordination sites at the activated solid phase as each individual metal ion chelating moiety of the anchoring part of a peptide to said coordination sites. Detachment is achieved by adding a large excess (typically 10 - 10 molar excess of competitive ligand related to the attached ligand) of competitive ligand compared to the attached peptide to the solvent.
• the competitive agent is soluble in the reagent mixture of the coupling step and does not react with the ingredients of the reagent mixtures.
• a reattachment of the anchoring part of the peptide to an activated solid phase is possible e.g. by diluting the mixture containing an activated solid phase is, a competitive agent and a non-attached peptide.
• the competitive ligand contains at least one moiety able to chelate metal ions, preferably a nitrogen containing moiety, selected from the group consisting of imidazolyle, N-methyl-imidazolyle, aminopurine, phenanthroline, bipyridine, terpyridine, triazacyclononane and tetraazacyclododecane, iminodiacetic acid moieties, nitrilotriacetic acid moieties and ethylendiaminetetraacetic acid moieties.
• a nitrogen containing moiety selected from the group consisting of imidazolyle, N-methyl-imidazolyle, aminopurine, phenanthroline, bipyridine, terpyridine, triazacyclononane and tetraazacyclododecane, iminodiacetic acid moieties, nitrilotriacetic acid moieties and ethylendiaminetetraacetic acid moieties.
• the competitive ligands contains structural moieties having electron pairs for coordinative bonds such as triphenylphosphine moieties, 6-aminopurine moieties or phthalocyanine moieties.
• the competitive ligand are glutathione, ethylenediaminotetraacetic acid, imidazole, N-methyl-imidazole, phenanthrolines, preferably 5-amino-l,10-phenanthrolines, aminoterpyridines, triazacyclononanes or tetraazacyclododecanes.
• the competitive agent is soluble in the solvent and reagent mixture of the coupling/or washing steps of solid phase synthesis, which typically are dichloromethane, N-methylpyrrolidone or dimethylformamide, and does not react with the ingredients of the reagent mixtures.
• the peptide comprises at least 25, more preferably at least 30, more preferably at least 60, most preferably at least 100 amino acids.
• the peptidyl moiety comprises at least one optionally protected, unnatural amino acids, wherein the characterization as non-natural relates to the non-occurrence of the unprotected amino acid in nature.
• An example is e.g. D-Phe.
• the chelating group on the peptide is of course an unwanted immunogen or inhibitor for biological function.
• the linker is an acid-labile and/or photocleavable linker (described e.g. in . US5739386).
• the linker is non-base labile as regards standard 20% Fmoc 20% piperidine chemistry for deprotection.
• Such linkers are readily commerciably available e.g. from Novabiochem (Merck Biosciences, UK); they are usually used to derivativatize solid supports as to provide resin handles for attachment of a starting amino acids or peptide segment for solid phase synthesis; here they are used to derivatize a peptide or starting amino acid with a chelating group, requiring selective removal from the full length peptide in the aftermath. They may also be used to introduce C-terminal carboxamides to the C-terminus of the peptidyl part upon cleavage (e.g. Fmoc Rink linker, EP -322348). Further examples are:
• linker moiety is acid-labile as to require at least 50% trifluoroacetic acid or more for cleavage.
• linker is acid-labile even at 3-10% trifluoroacetic acid in an aprotic, polar organic solvent such as N-methyl-pyrrolidone or dichloromethane.
• such selectively cleavable linkers are attached C-terminally or via amino acid side chains to the peptide, most preferably via the C-terminus.
• protection groups as are routinely used in peptide synthesis, being inert to standard Merrifield-type peptide synthesis, in particular and favorably to Fmoc synthesis; a broad review of such groups is found in Bodansky, supra.
• the present invention converts such protection groups into bi-functional linker-like moieties for transiently attaching a metal chelating group covalently to peptide.
• Most protection groups may be cleaved off under 'strongly' acidic conditions of 50%-80% trifluoroactic acid as applied in global deprotection of peptid and are encompassed by the present definition, as are special protection groups requiring selective chemical cleavage or that are base-labile (e.g.
• the protection groups are protection groups that are orthogonal to Fmoc chemistry and consequently are non-base labile (meaning they are not susceptible to 20% piperidine in dichloromethane or N-methylpyrrolidone).
• a protection group according to the present invention is not labile under 'mildly' acidic condition of up to 3-10% trifluoroacetic acid in dichloromethane or N-methylpyrrolidone but is inert to mild acidic cleavage from suitably susceptible resins in conventional covalent linkage (e.g.
• a dimedon derivative that is removable by hydrazinolysis and functional derivatives thereof (N-l-(4-nitro-l,3-dioxoindan-2-ylidene)-ethyl or Nde group, Kellam et al., Tetrahedron 54, 1998, p. 6817-6832; N-l-(4,4-dimethyl-2,6-dioxocyclohexylidene)-3-methylbutyl, Chan 1995).
• Functional derivatives include chelating group conjugates which essentially retain or have substantially unaffected the reactivity and selective chemical removability of afore types of protection groups; for the purpose of the present invention, a spacer moiety such as an alkyl, aryl or alkanoyl chain may need to be attached peripherially to such protection groups for bonding the metal chelating group to it.
• a protection group that is both orthogonal to Boc and Fmoc chemistry hence is both acid and base resistant when bonded to peptide, favorably preserves this inert character for all of the anchoring part moiety by conjugating to the chelating group in aliphatic, aromatic, ester or amido linkage; such linkage is chemically inert during SPPS.
• an anchoring part comprising a derivatized protection group N-terminal or as an N-TAG; such N-TAG is attached to or is provided with the last amino acid or peptide segment added during synthesis, and may be bonded to the Na or an amino acid side chain.
• N-TAG is attached to or is provided with the last amino acid or peptide segment added during synthesis, and may be bonded to the Na or an amino acid side chain.
• An example is given in the experimental section with TAGl 8, 10-(4,4-Dimethyl-2,6-dioxo-cyclohexylidene)-10-hydroxy-decanoic acid [l,10]phenanthrolin-5-ylamide hydroacetate.
• the protection group is a protection group of the Dde/Nde-type having a functional moiety of formula III
• protection groups may be combined with the chelating moieties or chelating groups described in the foregoing, except where stated that such chelating moiety is only suited for being used as a chelating ligand on the support due to strenght of complex formed with metal ion, as has e.g. been said for the picolylamines.
• a further object of the present invention are the isolated compounds X-L, constituting the anchoring part reagent for being subsequently ligated to the peptidic part in order to obtain the peptide of formula I.
• X is a protection group here, more preferably it is a protection group of the alloc/allyl type or of formula III, most preferably it is of the O-l-(2,6-dioxocyclohexylidene)- .
• the activated, vinylogous hydroxy function compares in reactivity to an acid anhydride. Hence Dde , Nde and related compounds are very simple conjugated, not requiring activating coupling reagents.
• Another preferred embodiment of the invention makes use of chelating groups attached in final steps of the synthesis to a peptide, namely by having an anchoring part either at the Na of the amino-terminus or proximal to the N-terminus side by attachment to the side chain of at least one of the last 10, preferably the last two, amino acids next to the N-terminus.
• purification of the raw product from contaminating side products is achieved by a chromatographic procedure making use of the coordinativly attachment of a peptide to an activated solid phase.
• This principle can be applied by using regular end-capping of free uncoupled amino groups in each synthesis cycle, hi applying this principle, purification of a raw product can be achieved within a single chromatographic run.
• Detachment can be achieved by addition of a suitable competition agent as described above or by increasing acidity of the solvent to a critical degree, preferably at least to below pH 6, more preferably to pH 5 or below, especially in aqueous solution, which offers another elegant way of detaching an anchored peptide from a metal affinity resin.
• Another advantage associated with the invention is that metal-affinity resins can be reused after peptide synthesis.
• the respective definitions and preferred embodiments as described above apply likewise to such object.
• the peptide part P comprises, optionally N-terminally protected, at least two imidazolyl side chains in combination with the solid phase or support comprising methylenepyridyl- amine chelating ligands defined above.
• said part P comprises oligohistidine or again it is a compound of the type P-L comprising short (1-6 residues) sequences of unnatural amino acids harbouring any of the above mentioned chelating functional groups L may be constituted of, most preferably the unnatural amino acids are having phenanthroline moieties in their side chains with at least one additional amino acid in between, wherein the additional amino acid doesn't interfere or is inert with chelation to the solid support such as for instance , and preferably, glycine. It is also possible, though less preferred, to use any other nitrogen containing group
• said oligohistidine moieties comprises at least 2 histidine residues which are vicinal or spaced apart by not more than 2 amino acid residues; more preferably 6-10 histidine residues.
• imidazolyl side chain comprising amino acids such as Nor- or Homo-histidine, wherein a Homo-histidine may comprise 1-10 extra methylene groups, to any of which the imidazolyl-moiety may be attached.
• said oligohistidine moieties comprise a seqence of at least 2 serial L- or D-histidine residues, more preferably 6 L- or D-histidine residues.
• said mono- or oligomeric amino acids of the anchoring part of the peptide contain at least one 5- amino-l,10-phenanthroline moiety or 5-amido-l,10-phenanthroline moitey, and preferably up to 10 therefrom.
• the activated solid phase of the present invention in peptide purification by synthesizing peptide in a traditional way from C to N-terminus, covalently attached to a solid-phase, but adding a chelating group L and anchoring part L-X, respectively in the last final coupling reaction N-terminally (e.g. a Gly-phenantroline conjugate), only the full length peptide products but not prematurely terminated chains may be easily purified after cleavage from resin by transient attachement to a metal ion activated, chelating solid-phase of the methylene-pyridyl-amine or specifically picolyl-amine type of the present invention.
• Example 1 Synthesis of a chemically cleavable Tag for amino groups (Example of an N- TAG: 10-(4,4-Dimethyl-2,6-dioxo-cyclohexylidene)-10-hydroxy-decanoic acid [l,10]phenanthrolin-5-ylamide hydroacetate (TAG18)):
• Examples 2-5 describe the syntheses of organic compounds which harbour suitable - partially protected - chelating groups and which can be coupled in analogy to example Ic to form dimedone-based N-terminal TAG's:
• Precipitated salts are filtered off and the solution is dissolved in 250 ethyl acetate.
• the organic layer is extracted with the following solutions: 2x 200 ml IN NaOH, 3x IN NaOH/brine 1:1.
• the crude peptide was dissolved in DMSO and lOOO ⁇ l purified on a Gilson Nebula LCMS System using a Kromasil RP Cl 8 column.
• the linear gradient extended from 5% aqueous TFA (0.1%) to 50% acetonitrile (containing 0.085% TFA) over 50 min.
• the flow rate was 20 mL/min and the absorbance monitored at 214nm.
• tags comprising dicarboxylic acids derivatives other than glutaric acid can be prepared analogously to the here described protocols.
• the peptide was prepared following standard procedures on a Rink-amide resin (0.2mmol). After FMOC deprotection of the last amino acid with piperidine/DMF 1 :4 the resin was washed 6 times with 20 ml DMF each. A solution of Tagl8*HOAc (0.56g, lmmol) in 20ml DMF and 1 drop TFA were added to resin and the mixture was shaken for 2 days. The solution was filtered off, the resin washed 6 times with DMF, then 2 times with DCM, and dried in vacuo. Cleavage of the crude peptides is achieved by treatment with 5ml TFA/TIS/EDT/H 2 O (94/1/2.5/2.5) for 120 minutes under inert atmosphere.
• the crude product from example 3 was purified on AktaFPLC system: 30 mg of the crude peptide were dissolved in 9ml ACN/iPrOH/H 2 O 5:4:1 + 1% DIEA + 5mM NMI and injected on a column filled with about 5.6ml Ni-loaded bispicolyl-aminopropyl silica resin.
• the column was washed with 70ml of ACN/iPrOH/H 2 O 5:4:1 + 1% DIEA + 5mM NMI, 60 ml ACN/H 2 O 1 : 1 , and the product was eluted with 60 ml ACN/H 2 O 1:1 + 1% 1 ,3-diamino ⁇ ropane.
• TAG 8 decorated peptide The above binding experiment is repeated under the same conditions whilst now using complete, deprotected peptide comprising deprotected TAG8 after global deprotection, that is the compound loaded and bound to the resin now is N,N'-diacetyl-2-amino-acetic acid [peptidyl-Na -10-(4,4-dimethyl-2,6-dioxo- cyclohexylidene)]-decanyl ester.
• the TAG8-peptide binds to the resin.
• CEM Odyssey Microwave Peptide Synthesizer
• the resin has been washed 5 times with DMF, then 5 times with DCM.
• 10 ml of a cleavage cocktail (94% TFA, 1.0% Triisopropylsilan (TIS), 2.5% water, 2.5% 3,6-dioxa-l,8- octandithiol (DODT)) were added and shaken for 2 hours. 10 minutes before stopping shaking, additional lOO ⁇ l TIS were added.
• the mixture was filtered and the peptide precipitated by dropping the filtrate into 40 ml of cold tert-butyl methyl ether (TBME).
• TBME cold tert-butyl methyl ether
• the UV absorption peak of the tagged peptide PeptideTl ⁇ exceeds all other signals. Three of the other peaks can be assigned by the signals in the mass spectrometer (see below).
• CFPS purification was performed by binding the crude peptide to a NiNTA resin and washing off non-tagged compounds in a column followed by cleavage of the tag in a batch hydrazinolysis experiment.
• One part distilled water was mixed with one part ACN, and degassed by 10 min sonification and bubbling argon through the solvent for 10 minutes.
• MES 2-(N-morpholino)ethanesulfonic acid monohydrate
• the column was washed with ACN/MES 1:1, 30ml, a gradient of ACN/MES 1:1 to ACN/H 2 O 1:1, 30ml, and with ACN/H 2 O 1:1, until the conductivity drops to 0 mS/cm (11.6 ml).
• a rather small injection peak shows the removal of non-tagged compounds by washing.
• the resin was transferred into a 50 ml Falcon tube, 6 ml of ACN/H 2 O 1:1 and 600 ⁇ l hydrazine-hydrate added and shaken for 1 hour. 6 ml ACN/H 2 O 1:1 were added and the resin filtered off and washed with 12 ml H 2 O. The filtrate was lyophilised, redisolved in ACN and water and lyophilised a second time.

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• 2005
  • 2005-11-24 JP JP2007541845A patent/JP2008520616A/ja not_active Abandoned
  • 2005-11-24 US US11/791,342 patent/US20100029911A1/en not_active Abandoned
  • 2005-11-24 WO PCT/EP2005/012576 patent/WO2006056443A2/en active Application Filing
  • 2005-11-24 EP EP05821714A patent/EP1831241A2/en not_active Withdrawn

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