WO1996023874A1 - A method of designing alpha-amylase mutants with predetermined properties - Google Patents
A method of designing alpha-amylase mutants with predetermined properties Download PDFInfo
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- WO1996023874A1 WO1996023874A1 PCT/DK1996/000057 DK9600057W WO9623874A1 WO 1996023874 A1 WO1996023874 A1 WO 1996023874A1 DK 9600057 W DK9600057 W DK 9600057W WO 9623874 A1 WO9623874 A1 WO 9623874A1
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- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N9/00—Enzymes; Proenzymes; Compositions thereof; Processes for preparing, activating, inhibiting, separating or purifying enzymes
- C12N9/14—Hydrolases (3)
- C12N9/24—Hydrolases (3) acting on glycosyl compounds (3.2)
- C12N9/2402—Hydrolases (3) acting on glycosyl compounds (3.2) hydrolysing O- and S- glycosyl compounds (3.2.1)
- C12N9/2405—Glucanases
- C12N9/2408—Glucanases acting on alpha -1,4-glucosidic bonds
- C12N9/2411—Amylases
- C12N9/2414—Alpha-amylase (3.2.1.1.)
- C12N9/2417—Alpha-amylase (3.2.1.1.) from microbiological source
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/38—Products with no well-defined composition, e.g. natural products
- C11D3/386—Preparations containing enzymes, e.g. protease or amylase
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/52—Genes encoding for enzymes or proenzymes
Definitions
- the present invention relates to a novel method of designing ⁇ -amylase mutants with predetermined properties, which method is based on the hitherto unknown three-dimensional structure of bacterial ⁇ -amylases.
- ⁇ -Amylases ⁇ -1.4 glucan-4-glucanohydrolase, EC 3.2.1.1
- ⁇ -Amylases constitute a group of enzymes which is capable of hydrolyzing starch and other linear and branched 1,4-glucosidic oligo- and polysaccharides.
- Almost all ⁇ -amylases studied have a few conserved regions with approximately the same length and spacing. One of these regions resembles the Ca2+ binding site of calmodulin and the others are thought to be necessary for the active centre and/or binding of the substrate.
- the three-dimensional structure can be determined by X-ray crystallographic analysis of ⁇ -amylase crystals, but it has proven difficult to obtain ⁇ -amylase crystals suitable for actually solving the structure.
- CGTase Bacillus circulans cyclodextrin glycosyltransferase
- the CGTase catalyzes the same type of reactions as ⁇ -amylases and exhibits some structural resemblance with ⁇ -amylases.
- crystallization and preliminary X-ray studies of B . subtilis ⁇ -amylases have been described (Chang et al. (1992) and Mizuno et al. (1993)). No final B . subtilis structure has been reported.
- the preparation of B . licheniformis ⁇ -amylase crystals has been reported (Suzuki et al. (1990), but no subsequent report on X-ray crystallographic analysis or three-dimensional structure are available.
- MacGregor (1987) predicts the presence of ⁇ -helices and ⁇ -barrels in ⁇ -amylases from different sources, including barley, pig pancreas and Bacillus amyloliquefaciens on the basis of the known structure of the A. oryzae TAKA ⁇ -amylase and secondary structure predicting algorithms. Furthermore, the possible loops and subsites which may be found to be present in, e.g., the B. amyloliquefaciens ⁇ -amylase are predicted (based on a comparison with the A . oryzae sequence and structure).
- A.E. MacGregor (Starch/Starke 45 (1993), No. 7, p. 232-237) presents a review of the relationship between the structure and activity of ⁇ -amylase related enzymes. Hitherto, no three-dimensional structure has been available for the industrially important Bacillus ⁇ -amylases (which in the present context are termed "Termamyl-like ⁇ -amylases"), including the B. licheniformis, the B . amyloliquefaciens, and the B. stearothermophilus ⁇ -amylase.
- the three-dimensional structure of a Termamyl-like bacterial ⁇ -amylase has now been elucidated. On the basis of an analysis of said structure it is possible to identify structural parts or specific amino acid residues which from structural or functional considerations appear to be important for conferring the various properties to the Termamyl-like ⁇ -amylases. Furthermore, when comparing the Termamyl-like ⁇ -amylase structure with known structures of the fungal and mammalian ⁇ -amylases mentioned above, it has been found that some similarities exist between the structures, but also that some striking, and not previously predicted structural differences between the ⁇ -amylases exist. The present invention is based on these findings.
- the invention relates to a method of constructing a variant of a parent Termamyl-like ⁇ -amylase, which variant has ⁇ -amylase activity and at least one altered property as compared to said parent ⁇ -amylase, which method comprises i) analysing the structure of the Termamyl-like ⁇ -amylase with a view to identifying at least one amino acid residue or at least one structural part of the Termamyl-like ⁇ -amylase structure, which amino acid residue or structural part is believed to be of relevance for altering said property of the parent Termamyl-like ⁇ -amylase (as evaluated on the basis of structural or functional considerations), ii) constructing a Termamyl-like ⁇ -amylase variant, which as compared to the parent Termamyl-like ⁇ -amylase, has been modified in the amino acid residue or structural part identified in i) so as to alter said property, and iii) testing the resulting
- the present invention relates to a method of constructing a variant of a parent Termamyl-like ⁇ -amylase, which variant has ⁇ -amylase activity and one or more altered properties as compared to said parent ⁇ -amylase, which method comprises
- iii) modifying the part of the Termamyl-like ⁇ -amylase identified in ii) whereby a Termamyl-like ⁇ -amylase variant is obtained, one or more properties of which differ from the parent Termamyl-like ⁇ -amylase.
- the invention relates to a method of constructing a variant of a parent non-Termamyl-like ⁇ -amylase, which variant has ⁇ -amylase activity and one or more altered properties as compared to said parent ⁇ -amylase, which method comprises
- iii) modifying the part of the non-Termamyl-like ⁇ -amylase identified in ii) whereby a non-Termamyl-like ⁇ -amylase variant is obtained, one or more properties of which differ from the parent Termamyl-like ⁇ -amylase.
- the property which may be altered by the above methods of the present invention may, e.g., be substrate specificity, substrate binding, substrate cleavage pattern, temperature stability, pH dependent activity, pH dependent stability (especially increased stability at low (e.g. pH ⁇ 6, in particular pH ⁇ 5) or high (e.g. pH>9) pH values), stability towards oxidation, Ca 2+ -dependency, specific activity, and other properties of interest.
- the alteration may result in a variant which, as compared to the parent Termamyl-like ⁇ -amylase, has an increased specific activity at a given pH and/or an altered substrate specificity.
- the invention relates to variants of a Termamyl-like ⁇ -amylase, DNA encoding such variants and methods of preparing the variants. Finally, the invention relates to the use of the variants for various industrial purposes.
- homologous ⁇ -amylases include an ⁇ -amylase derived from a strain of the Bacillus sp. NCIB 12289, NCIB 12512, NCIB 12513 or DSM 9375, all of which are described in detail in WO 95/26397, and the ⁇ -amylase described by Tsukamoto et al., 1988, Biochemical and Biophysical Research Communications, Vol. 151, No. 1.
- Still other homologous ⁇ -amylases include the ⁇ -amylase produced by the B . licheniformis described in EP 252 666 (ATCC 27811), and the ⁇ -amylases identified in WO 91/00353 and WO 94/18314.
- Termamyl-like B. licheniformis ⁇ -amylases are Optitherm ® and Takatherm ® (available from Solvay), Maxamyl ® (available from Gistbrocades/Genencor), Spezym AA ® (available from Genencor), and Keistase ® (available from Daiwa).
- Termamyl-like ⁇ -amylase is intended to indicate an ⁇ -amylase which, on the amino acid level, exhibits a substantial homology to Termamyl ® , i.e. the B. licheniformis ⁇ -amylase SEQ ID NO 2.
- a Termamyl-like ⁇ -amylase is an ⁇ -amylase, which has the amino acid sequence shown in SEQ ID No.
- the "homology" may be determined by use of any conventional algorithm, preferably by use of the GAP progamme from the GCG package version 7.3 (June 1993) using default values for GAP penalties (Genetic Computer Group (1991) Programme Manual for the GCG Package, version 7, 575 Science Drive, Madison, Wisconsin, USA 53711).
- Property ii) of the ⁇ -amylase i.e. the immunological cross reactivity, may be assayed using an antibody raised against or reactive with at least one epitope of the relevant Termamyl-like ⁇ -amylase.
- the antibody which may either be monoclonal or polyclonal, may be produced by methods known in the art, e.g. as described by Hudson et al., 1989.
- the immunological cross-reactivity may be determined using assays known in the art, examples of which are Western Blotting or radial immunodiffusion assay, e.g. as described by Hudson et al., 1989. In this respect, immunological cross-reactivity between the ⁇ -amylases having the amino acid sequences SEQ ID Nos. 2, 4 and 6, respectively, has been found.
- the oligonucleotide probe used in the characterization of the Termamyl-like ⁇ -amylase in accordance with property iii) above may suitably be prepared on the basis of the full or partial nucleotide or amino acid sequence of the ⁇ -amylase in question.
- Suitable conditions for testing hybridization involve presoaking in 5xSSC and prehybridizing for lh at -40°C in a solution of 20% formamide, 5xDenhardt's solution, 50mM sodium phosphate, pH 6.8, and 50 ⁇ g of denatured sonicated calf thymus DNA, followed by hybridization in the same solution supplemented with 100 ⁇ M ATP for 18h at -40°C, or other methods described by e.g. Sambrook et al., 1989.
- derived from is intended not only to indicate an ⁇ -amylase produced or producible by a strain of the organism in question, but also an ⁇ -amylase encoded by a DNA sequence isolated from such strain and produced in a host organism transformed with said DNA sequence.
- the term is intended to indicate an ⁇ -amylase which is encoded by a DNA sequence of synthetic and/or cDNA origin and which has the identifying characteristics of the ⁇ -amylase in question.
- the term is also intended to indicate that the parent ⁇ -amylase may be a variant of a naturally occurring ⁇ -amylase, i.e. a variant which is the result of a modification (insertion, substitution, deletion) of one or more amino acid residues of the naturally occurring ⁇ -amylase.
- Parent hybrid ⁇ -amylases may be a variant of a naturally occurring ⁇ -amylase, i.e. a variant which is the result of a modification (insertion, substitution, deletion) of one or more amino acid residues of the naturally occurring
- the parent ⁇ -amylase (being a Termamyl-like or non-Termamyl-like ⁇ -amylase) may be a hybrid ⁇ -amylase, i.e. an ⁇ -amylase which comprises a combination of partial amino acid sequences derived from at least two ⁇ -amylases.
- the parent hybrid ⁇ -amylase may be one which on the basis of amino acid homology and/or immunological cross-reactivity and/or DNA hybridization (as defined above) can be determined to belong to the Termamyl-like ⁇ -amylase family.
- the hybrid ⁇ -amylase is typically composed of at least one part of a Termamyl-like ⁇ -amylase and part(s) of one or more other ⁇ -amylases selected from Termamyl-like ⁇ -amylases or non-Termamyl-like ⁇ -amylases of microbial (bacterial or fungal) and/or mammalian origin.
- the parent hybrid ⁇ -amylase may comprise a combination of at least two Termamyl-like ⁇ -amylases, or of at least one Termamyl-like and at least one non-Termamyl-like bacterial ⁇ -amylase, or of at least one Termamyl-like and at least one fungal ⁇ -amylase.
- the parent ⁇ -amylase comprises a C-terminal part of an ⁇ -amylase derived from a strain of B. licheniformis and a N-terminal part of an ⁇ -amylase derived from a strain of B . amyloliquefaciens or from a strain of B. stearothermophilus .
- the parent ⁇ -amylase comprises at least 430 amino acid residues of the C-terminal part of the B . licheniformis ⁇ -amylase, and may, e.g. comprise a) an amino acid segment corresponding to the 37 N-terminal amino acid residues of the B . amyloliquefaciens ⁇ -amylase having the amino acid sequence shown in SEQ ID No. 4 and an amino acid segment corresponding to the 445 C-terminal amino acid residues of the B . licheniformis ⁇ -amylase having the amino acid sequence shown in SEQ ID No. 2, or b) an amino acid segment corresponding to the 68 N-terminal amino acid residues of the B .
- the parent hybrid ⁇ -amylase may belong to a non-Termamyl-like ⁇ -amylase family, e.g. the Fungamyl-like ⁇ -amylase family.
- the hybrid may comprise at least one part of an ⁇ -amylase belonging to the non-Termamyl-like ⁇ -amylase family in combination with one or more parts derived from other ⁇ -amylases.
- the Termamyl-like ⁇ -amylase which was used to elucidate the three-dimensional structure forming the basis for the present invention consists of the 300 N-terminal amino acids of the B . amyloliquefaciens ⁇ -amylase (with the amino acid sequence shown in SEQ ID No. 4) and amino acids 301-483 of the C-terminal end of the B . licheniformis ⁇ -amylase with the amino acid sequence SEQ ID No. 2.
- the bacterial ⁇ -amylase belongs to the "Termamyl-like ⁇ -amylase family" and the present structure is believed to be representative for the structure of any Termamyl-like ⁇ -amylase.
- the structure of the ⁇ -amylase was solved in accordance with the principle for X-ray crystallographic methods given in "X-Ray Structure Determination", Stout, G.K. and Jensen, L.H., John Wiley & Sons, inc. NY, 1989.
- the structural coordinates for the solved crystal structure of the ⁇ -amylase at 2.2 A resolution using the isomorphous replacement method are given in a standard PDB format (Brookhaven Protein Data Base) in Appendix 1. It is to be understood that Appendix 1 forms part of the present application.
- Amino acid residues of the enzyme are identified by three-letter amino acid code (capitalized letters).
- the ⁇ -amylase structure is made up of three globular domains ordered A, B, and C with respect to sequence, which lie approximately along a line in the order B, A, C.
- the domains can be defined as being residues 1-103 and 206-395 for domain A, residues 104-205 for domain B, and residues 396-483 for domain C, the numbers referring to the B. licheniformis ⁇ -amylase. This gives rise to an elongated molecule, the longest axis being about 85A. The widest point perpendicular to this axis is approximately 50A and spans the central A domain.
- the active site residues of the B . licheniformis ⁇ -amylase (SEQ ID NO 2) are D323, D231 and E261.
- Domain A is the largest domain and contains the active site (comprised of a cluster of three amino acid residues placed at the bottom of a deep cleft in the enzyme's surface). Domain A of all known ⁇ -amylase structures have the same overall fold, viz. the (beta/alpha) 8 barrel with 8 central beta strands
- Beta strand 1 is connected to helix 1 by a loop denoted loop 1 and an identical pattern is found for the other loops. These loops show some variation in size and some can be quite extensive.
- Beta-strands in the (beta/alpha) 8 barrel superimpose well between the various known ⁇ -amylase structures, and this part of the structure, including the close surroundings of the active site located at the c-terminal end of the beta-strands, show high similarity between the different amylases.
- the loops connecting beta-strands and alpha helices display high variations between alpha amylases. These loops constitute the structural context of the active site and the majority of the contacts to the substrate is found among residues located in these loops. Such important characteristics as substrate specificity, substrate binding, pH/activity profile, starch cleavage pattern are determined by the amino acids and the positions of same in these loops.
- the substantial differences between the Fungamyl-like ⁇ -amylase structure and the structure of the Termamyl-like ⁇ -amylase disclosed herein which are found in loops 1, 2, 3, and 8 are visualized in the Figures.
- the Termamyl-like ⁇ -amylase structure has been found to comprise a special domain structure in the A domain's loop3, also called domain B.
- domain B The structure of the Termamyl-like ⁇ -amylase B domain has never been seen before in any of the known ⁇ -amylase or ( ⁇ /alpha) 8-barrel proteins.
- the domain B structure is a very compact domain having a very high number of charged residues.
- the B domain arises as an extension of the loop between strand 3 and helix 3 of domain A (shown in Fig. 7) and contains a 5 stranded antiparallel ⁇ -sheet structure containing at least one long loop structure and having the connectivity -1, +3, -1X, +2 (Richardson, 1981, Adv. Protein Chem. 34, 167-339).
- the first four strands of the B domain form two hairpin loops which twist around each other like a pair of crossed fingers
- the mainchain folds into a ⁇ -strand which connects two small ⁇ -sheet structures. After making one turn in one sheet it folds back and makes up a two stranded sheet in contact with domain A and an internal hole in the ⁇ -amylase structure. Then the mainchain folds up to a small sheet structure nearly perpendicular to the first two sheets. Before entering the helix 3 on top of the ⁇ -strand 3, the approximately 24 last amino acids in domain B form two calcium binding sites in the contact region to domain A.
- Domain B is connected with domain A by two peptide stretches, which divide the domain-domain contact areas into two. Domain B is in contact with Domain A by a calcium binding region and an internally buried hole containing waters. Many types of molecular contacts are present. Ionic interacting between acid and basic amino acids are possible, these interactions are very important for the general stability at high pH and for keeping the Calcium binding sites intact. Domain C
- Domain C is the C-terminal part of the protein consisting of amino acids 394-483. Domain C is composed entirely of ⁇ -strands which forms a single 8-stranded sheet structure, which folds back on itself, and thus may be described as a ⁇ -sandwich structure. The connectivity is +1,+1, +5, -3, +1, +1, -3 although strands 6 and 7 are only loosely connected. One part of the ⁇ -sheet forms the interface to domain A. Ca -binding and Na-binding si tes
- the structure of the Termamyl-like ⁇ -amylase is remarkable in that it exhibits four calcium-binding sites and one sodium-binding site.
- four calcium ions and one sodium ion are found to be present in the structure, although one of the calcium ions displays very weak coordination.
- Two of the calcium ions form part of a linear cluster of three ions, the central ion being attributed to sodium, which lie at the junction of the A and B domains.
- the coordinating residues for the calcium ions between the A and B domain are as follows (using the Pdb file nomenclature for amino acid residues and atoms in the Pdb file found in Appendix 1 herein):
- the backbone carbonyls from His235 and Asp194, the sidechain atom OD1 from residues Aspl94, Asn102 and Asp200, and one water molecule WAT X3 (atom OW7).
- the binding site includes atom OD2 from Asp194, Asp200, Asp183 and Asp159, and a backbone carbonyl from Val201.
- the coordinates for the other calcium ion between domain A and B are (IUM 501) : atom OD2 from Asp204 and Asp159, backbone carbonyl from Asp183 and Ala181, atom OD1 from Asp202, and one water molecule WAT X7 (atom OW7).
- One calcium ion is located between the A and C domain, another is located in the C domain.
- the first mentioned calcium ion, which is also the one best coordinated (IUM 503) includes a carbonyl backbone from Gly300, Tyr302 and His406, atom OD2/OD1 from Asp430, atom OD1 from Asp407, and one water molecule WAT X6 (atom OW7).
- the other and very weakly coordinated calcium site comprises 4 water molecules WAT X21 (atom OW8), X6 (atom OW6), X9 (atom OW0) and X28 (atom OW8), OE1/OE2 from Glu447 and OD1 from Asn444.
- amino acid residues of another Termamyl-like ⁇ -amylase which are contemplated to be within a distance of 4A of the substrate, may easily be identified by aligning the amino acid sequence SEQ ID NO 2 with that of the other Termamyl-like ⁇ -amylase and thereby identifying the positions equivalent to those identified above.
- the solved structure defined by the coordinates of Appendix 1 is believed to be representative for the structure of all Termamyl-like ⁇ -amylases.
- a model structure of other Termamyl-like ⁇ -amylases may easily be built on the basis of the coordinates given in Appendix 1 adapted to the ⁇ -amylase in question by use of an alignment betweeen the respective amino acid sequences.
- the creation of a model structure is exemplified in Example 1.
- Termamyl-like ⁇ -amylase structure (Ca-binding site, substrate binding site, loops, etc.) may easily be identified in other Termamyl-like ⁇ -amylases on the basis of a model (or solved) structure of the relevant Termamyl-like ⁇ -amylase or simply on the basis of an alignment between the amino acid sequence of the Termamyl-like ⁇ -amylase in question with that of the B. lichenformis ⁇ -amylase used herein for identifying the amino acid residues of the respective structural elements.
- Termamyl-like variants of the invention which are defined by modification of specific amino acid residues of a specific Termamyl-like ⁇ -amylase
- variants of another Termamyl-like ⁇ -amylase modified in an equivalent position are intended to be covered as well.
- this amino acid residue shall be considered as representing the equivalent amino acid residue of any other Termamyl-like ⁇ -amylase.
- the terms "structure of a Termamyl-like ⁇ -amylase” and "Termamyl-like ⁇ -amylase structure” are intended to indicate the solved structure defined by the coordinates presented in Appendix 1 or a model structure of a given Termamyl-like ⁇ -amylase (such as the B . licheniformis ⁇ -amylase) built on the basis of the solved structure.
- the parent Termamyl-like ⁇ -amylase to be modified in accordance with the present invention is different from the ⁇ -amylase which was actually used for solving the structure (Appendix 1).
- the amino acid residue(s) or structural part(s) identified in the solved structure (Appendix 1) in step i) of the method according to the first, second or third aspect of the invention must be translated into the corresponding amino acid residue(s) or structural part(s) of the parent Termamyl-like ⁇ -amylase in question.
- the “translation” is conveniently performed on the basis of an amino acid sequence alignment between the amino acid sequence of the Termamyl-like ⁇ -amylase used for solving the structure and the amino acid sequence of the parent Termamyl-like ⁇ -amylase in question.
- the analysis or comparison performed in step i) of the method according to the first, second and third aspect, respectively, of the invention may be performed by use of any suitable computer programme capable of analysing and/or comparing protein structures, e.g. the computer programme Insight, available from Biosym Technologies, Inc.
- the basic principle of structure comparison is that the three-dimensional structures to be compared are superimposed on the basis of an alignment of secondary structure elements (such as the central 8 ⁇ -strands in the barrel) and the parts differing between the structures can subsequently easily be identified from the superimposed structure.
- the structural part which is identified in step i) of the methods of the first, second and third aspects of the invention may be composed of one amino acid residue.
- the structural part comprises more than one amino acid residue, typically constituting one of the above parts of the Termamyl-like ⁇ -amylase structure such as one of the A, B, or C domains, an interface between any of these domains, a calcium binding site, a loop structure, the substrate binding site, or the like.
- the term "structural or functional considerations" is intended to indicate that modifications are made on the basis of an analysis of the relevant structure or structural part and its contemplated impact on the function of the enzyme.
- an analysis of the structures of the various ⁇ -amylases which until now has been elucidated, optionally in combination with an analysis of the functional differences between these ⁇ -amylases, may be used for assigning certain properties of the ⁇ -amylases to certain parts of the ⁇ -amylase structure or to contemplate such relationship. For instance, differences in the pattern or structure of loops surrounding the active site may result in differences in access to the active site of the substrate and thus differences in substrate specificity and/or cleavage pattern.
- the modification of an amino acid residue or structural part is typically accomplished by suitable modifications of a DNA sequence encoding the parent enzyme in question.
- modified as used in step ii) in the method according to the first aspect of the invention is intended to have the following meaning: When used in relation to an amino acid residue the term is intended to mean replacement of the amino acid residue in question with another amino acid residue. When used in relation to a structural part, the term is intended to mean replacement of one or more amino acid residues of said structural part, addition of one or more amino acid residues to said part, or deletion of one or more amino acid residues of said structural part.
- the construction of the variant of interest is accomplished by cultivating a microorganism comprising a DNA sequence encoding the variant under conditions which are conducive for producing the variant, and optionally subsequently recovering the variant from the resulting culture broth. This is described in detail further below.
- the property of the parent enzyme to be modified is selected from calcium dependency, substrate binding, cleavage pattern, pH dependent activity and the like. Specific examples of how to change these properties of a parent Termamyl-like ⁇ -amylase are given further below.
- parent Termamyl-like ⁇ -amylase to be modified is a B . licheniformis ⁇ -amylase.
- One important advantage of the methods according to the second and third aspects of the present invention is that it is possible to adapt the structure (or a structural part) of a Termamyl-like ⁇ -amylase to the structure (or structural part) of a non-Termamyl-like ⁇ -amylase and vide versa .
- the modification to be performed in step iii) of the method according to the second aspect of the invention is accomplished by deleting one or more amino acid residues of the part of the Termamyl-like ⁇ -amylase to be modified so as to adapt the structure of said part of the parent ⁇ -amylase to the corresponding part of the non-Termamyl-like ⁇ -amylase; by replacing one or more amino acid residues of the part of the Termamyl-like ⁇ -amylase to be modified with the amino acid residues occupying corresponding positions in the non-Termamyl-like ⁇ -amylase; or by insertion of one or more amino acid residues present in the non-Termamyl-like ⁇ -amylase into a corresponding position in the Termamyl-like ⁇ -amylase.
- the modification is to be understood analogously, performed on the non-Termamyl-like parent ⁇ -amylase rather than the Termamyl-like
- the part of the structure to be identified is preferably one which in the folded enzyme is believed to be in contact with the substrate (cf the disclosure above in the section entitled "Substrate-binding site) or involved in substrate specificity and/or cleavage pattern, and/or one which is in contact with one of the calcium or sodium ions and/or one, which is contributing to the pH or temperature profile of the enzyme, or one which otherwise, from structural or functional considerations, is contemplated to be responsible for differences in one or more properties of the Termamyl-like and non-Termamyl-like ⁇ -amylase.
- the non-Termamyl-like ⁇ -amylase with which the comparison is made in step i) of the method of the second aspect of the invention and which is the parent ⁇ -amylase in the method of the third aspect of the invention may be any ⁇ -amylase, which does not belong to the family of Termamyl-like ⁇ -amylases (as defined above) and, which as a consequence thereof, has a different three-dimensional structure.
- the non-Termamyl-like ⁇ -amylase should be one which has, at the time that the method is performed, an elucidated or contemplated three-dimensional structure.
- the non-Termamyl-like ⁇ -amylase may, e.g., be a fungal ⁇ -amylase, a mammalian or a plant ⁇ -amylase or a bacterial ⁇ -amylase (different from a Termamyl-like ⁇ -amylase).
- ⁇ -amylases include the Aspergillus oryzae TAKA ⁇ -amylase, the A . niger acid ⁇ -amylase, the Bacillus subtilis ⁇ -amylase, the porcine pancreatic ⁇ -amylase and a barley ⁇ -amylase. All of these ⁇ -amylases have elucidated structures which are clearly different from the structure of the Termamyl-like ⁇ -amylase shown herein.
- the fungal ⁇ -amylases mentioned above i.e. derived from A . niger and A. oryzae, are highly homologous on the amino acid level and generally considered to belong to the same family of ⁇ -amylases.
- this family is termed "Fungamyl-like ⁇ -amylase” and intends to indicate an ⁇ -amylase which exhibits a high homology, i.e. more than 70%, such as 80% homologous (as defined herein) to the fungal ⁇ -amylase derived from Aspergillus oryzae, commercially available as Fungamyl ® , and the A . niger ⁇ -amylase.
- LOOP modifications In order to change the substrate specificity of the parent ⁇ -amylase to be modified it is relevant to consider loop modifications. For instance changing one or more of the loop structures of the Termamyl-like ⁇ -amylase into a closer depictance with the corresponding loop structure (s) of a non-Termamyl-like ⁇ -amylase (such as a Fungamyl-like ⁇ -amylase) it is contemplated that it is possible to change the substrate specificity in the direction of that of the non-Termamyl ⁇ -amylase. In the following different types of loop modifications of interest are listed. It will be understood that the variants may have other changed properties in addition to the modified substrate specificity.
- the loop modification will comprise replacement of an entire loop structure or a substantial part thereof in, e.g., the Termamyl- like ⁇ -amylase, with the corresponding loop structure (or substantial part thereof) in a non-Termamyl-like ⁇ -amylase.
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, in which variant at least one amino acid residue of the parent ⁇ -amylase, which is/are present in a fragment corresponding to the amino acid fragment 44-57 of the amino acid sequence of SEQ ID No. 4, i.e. loop 2, has been deleted or replaced with one or more amino acid residues which is/are present in a fragment corresponding to the amino acid fragment 66-84 of the amino acid sequence shown in SEQ ID No. 10, or in which one or more additional amino acid residues has been added using the relevant part of SEQ ID No. 10 or a corresponding part of another Fungamyl-like ⁇ -amylase as a template.
- the amino acid sequence shown in SEQ ID No. 10 is the amino acid sequence of the A. oryzae ⁇ -amylase, i.e. a Fungamyl-like ⁇ -amylase. It will be understood that amino acid residues or fragments found in corresponding positions in other ⁇ -amylases, in particular Fungamyl-like ⁇ -amylases, may be used as a template for the construction of the variant according to the invention. The corresponding part in other homologous ⁇ -amylases may easily be identified on the basis of a comparison of the amino acid sequences and/or three-dimensional structures of the respective ⁇ -amylases.
- the variant may be one, which, when the amino acid sequence of the variant is aligned most closely with the amino acid sequence of the said parent ⁇ -amylase, occupies the same position as the portion from residue X to residue Y of SEQ ID No 4, the said region having at least 80% such as at least 90% sequence homology with the part of SEQ ID No 10 extending from residue Z to residue V of SEQ ID No 10, wherein
- X is the amino acid residue occupying position 44, 45, 46, 47 or 48 of SEQ ID No. 4
- Y is the amino acid residue occupying position 51, 52, 53, 54, 55, 56 or 57 of SEQ ID No. 4,
- Z is the amino acid residue occupying position 66, 67, 68, 69 or 70 of SEQ ID No. 10, and
- V is the amino acid residue occupying position 78, 79, 80, 81, 82, 83 or 84 of SEQ ID No. 10.
- the variant may be one in which an amino acid fragment X-Y of the parent ⁇ -amylase, which corresponds to or is within the amino acid fragment 44-57 of SEQ ID No. 4, has been replaced with an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 66-84 of the amino acid sequence shown in SEQ ID No. 10, in X, Y, Z and
- a specific example of a variant according to this embodiment is a variant of a parent Termamyl-like ⁇ -amylase, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 48-51 of SEQ ID No. 4, has been replaced with an amino acid fragment corresponding to amino acid residues 70-78 of the amino acid sequence shown in SEQ ID No. 10.
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, in which variant at least one of the amino acid residues of the parent ⁇ -amylase, which is/are present in an amino acid fragment corresponding to the amino acid fragment 195-202 of the amino acid sequence of SEQ ID No. 4, has been deleted or replaced with one or more of the amino acid residues which is/are present in an amino acid fragment corresponding to the amino acid fragment 165-177 of the amino acid sequence shown in SEQ ID No. 10, or in which one or more additional amino acid residues has been added using the relevant part of SEQ ID No. 10 or a corresponding part of another Fungamyl-like ⁇ -amylase as a template.
- the variant may be one in which an amino acid fragment X-Y of the parent ⁇ -amylase which corresponds to or is within the amino acid fragment 195-202 of SEQ ID No. 4, has been replaced by an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 165-177 of the amino acid sequence shown in SEQ ID No. 10, in which
- X is an amino acid residue corresponding to the amino acid occupying position 195 or 196 of SEQ ID No. 4,
- Y is an amino acid residue corresponding to the amino acid occupying position 198, 199, 200, 201, or 202 of SEQ ID No. 4,
- Z is an amino acid residue corresponding to the amino acid occupying position 165 or 166 of SEQ ID No. 10, and
- V is an amino acid residue corresponding to the amino acid occupying position 173, 174, 175, 176 or 177 of SEQ ID No. 10.
- the variant according to this aspect may be one, which, when the amino acid sequence of variant is aligned most closely with the amino acid sequence of the said parent Termamyl-like ⁇ -amylase, occupies the same position as the portion from residue X to residue Y of SEQ ID No 4, the said region having at least 80%, such as 90% sequence homology with the part of SEQ ID No 10 extending from residue Z to residue V of SEQ ID No 10, the meaning of X, Y, Z and V being as identified above.
- a specific example of a variant according to this embodiment is a variant of a parent Termamyl-like ⁇ -amylase, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 196-198 of SEQ ID No. 4, has been replaced with the amino acid fragment corresponding to amino acid residues 166-173 of the amino acid sequence shown in SEQ ID No. 10. Loop 3 modifications - complete domain B
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, in which variant at least one of the amino acid residues of the parent ⁇ -amylase, which is/are present in a fragment corresponding to the amino acid fragment 117-185 of the amino acid sequence of SEQ ID No. 4, has/have been deleted or replaced with one or more of the amino acid residues, which is/are present in an amino acid fragment corresponding to the amino acid fragment 98-210 of the amino acid sequence shown in SEQ ID No. 10, or in which one or more additional amino acid residues has been added using the relevant part of SEQ ID No. 10 or a corresponding part of another Fungamyl-like ⁇ -amylase as a template.
- the variant may be one, in which an amino acid fragment X-Y of the parent ⁇ -amylase, which corresponds to or is within the amino acid fragment 117-185 of SEQ ID No. 4, has been replaced with an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 98-210 of the amino acid sequence shown in SEQ ID No. 10, in which variant
- X is an amino acid residue corresponding to the amino acid occupying position 117, 118, 119, 120 or 121 of SEQ ID No. 4,
- Y is an amino acid residue corresponding to the amino acid occupying position 181, 182, 183, 184 or 185 of SEQ ID No. 4,
- Z is an amino acid residue corresponding to the amino acid occupying position 98, 99, 100, 101, 102 of SEQ ID No. 10, and
- V is an amino acid residue corresponding to the amino acid occupying position 206, 207, 208, 209 or 210 of SEQ ID No. 10.
- a specific example of a variant according to this embodiment is a variant of a parent ⁇ -amylase, in which an amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 121-181 of SEQ ID No. 4, has been replaced with the amino acid fragment corresponding to amino acid residues 102-206 of the amino acid sequence shown in SEQ ID No. 10.
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, in which variant at least one of the amino acid residues of the parent ⁇ -amylase, which is/are present in a fragment corresponding to the amino acid fragment 117-181 of the amino acid sequence of SEQ ID No. 4, has/have been deleted or replaced with one or more of the amino acid residues, which is/are present in an amino acid fragment corresponding to the amino acid fragment to 98-206 of the amino acid sequence shown in SEQ ID No. 10, or in which one or more additional amino acid residues has been added using the relevant part of SEQ ID No. 10 or a corresponding part of another Fungamyl-like ⁇ -amylase as a template.
- the variant may be one, in which the amino acid fragment X-Y of the parent ⁇ -amylase, which corresponds to or is within the amino acid fragment 117-177 if SEQ ID No. 4, has/have been replaced with an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 98-202 of the amino acid sequence shown in SEQ ID No. 10, in which variant X is an amino acid residue corresponding to the amino acid occupying position 117, 118, 119, 120 or 121 of SEQ ID No. 4,
- Y is an amino acid residue corresponding to the amino acid occupying position 174, 175, 176 or 177 of SEQ ID No. 4,
- Z is an amino acid residue corresponding to the amino acid occupying position 98, 99, 100, 101, 102 of SEQ ID No. 10, and
- V is an amino acid residue corresponding to the amino acid occupying position 199, 200, 201 or 202 of SEQ ID No. 10.
- a specific example of a variant according to this embodiment of the invention is a variant, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 121-174 of SEQ ID No. 4, has been replaced with the amino acid fragment corresponding to amino acid residues 102-199 of the amino acid sequence shown in SEQ ID No. 10.
- the present invention relates to a variant of a parent Termamyl-like ⁇ -amylase, in which variant at least one of the amino acid residues of the parent ⁇ -amylase, which is/are present in an amino acid fragment corresponding to the amino acid fragment 12-19 of the amino acid sequence of SEQ ID No. 4, has/have been deleted or replaced with one or more of the amino acid residues, which is/are present in an amino acid fragment which corresponds to the amino acid fragment 28-42 of SEQ ID No. 10, or in which one or more additional amino acid residues has/have been inserted using the relevant part of SEQ ID No. 10 or a corresponding part of another Fungamyl-like ⁇ -amylase as a template.
- the variant may be one, in which the amino acid fragment X-Y of the parent ⁇ -amylase, which corresponds to or is within the amino acid fragment 12-19 of SEQ ID No. 4, has/have been replaced with an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 28-42 of the amino acid sequence shown in SEQ ID No. 10, in which variant
- X is an amino acid residue corresponding to the amino acid occupying position 12, 13 or 14 of SEQ ID No. 4,
- Y is an amino acid residue corresponding to the amino acid occupying position 15, 16, 17, 18 or 19 of SEQ ID No. 4,
- Z is an amino acid residue corresponding to the amino acid occupying position 28, 29, 30 , 31 or 32 of SEQ ID No. 10, and
- V is an amino acid residue corresponding to the amino acid occupying position 38, 39, 40, 41 or 42 of SEQ ID No. 10.
- a specific example of a variant according to this aspect of the invention is a variant, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 14-15 of SEQ ID No. 4, has been replaced with the amino acid fragment corresponding to amino acid residues 32-38 of the amino acid sequence shown in SEQ ID No. 10.
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, in which variant at least one of the amino acid residues of the parent ⁇ -amylase, which is present in a fragment corresponding to amino acid residues 7-23 of the amino acid sequence of SEQ ID. No. 4, has/have been deleted or replaced with one or more amino acid residues, which is/are present in an amino acid fragment corresponding to amino acid residues 13-45 of the amino acid sequence shown in SEQ ID No. 10, or in which one or more additional amino acid residues has/have been inserted using the relevant part of SEQ ID No. 10 or a corresponding part of another Fungamyl-like ⁇ -amylase as a template.
- the variant may be one, in which the amino acid fragment X-Y of the parent ⁇ -amylase, which corresponds to or is within the amino acid fragment 7-23 of SEQ ID No. 4, has/have been replaced with an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 13-45 of the amino acid sequence shown in SEQ ID No. 10, in which variant X is an amino acid residue corresponding to the amino acid occupying position 7 or 8 of SEQ ID No. 4,
- Y is an amino acid residue corresponding to the amino acid occupying position 18, 19, 20, 21, 22 or 23 of SEQ ID No. 4,
- Z is an amino acid residue corresponding to the amino acid occupying position 13 or 14 of SEQ ID No. 10
- V is an amino acid residue corresponding to the amino acid occupying position 40, 41, 42, 43, 44 or 45 of SEQ ID No. 10.
- a specific variant according to this embodiment is one, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 8-18 of SEQ ID No. 4, has been replaced with the amino acid fragment corresponding to amino acid residues 14-40 of the amino acid sequence shown in SEQ ID No. 10.
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, in which variant at least one of the amino acid residues of the parent ⁇ -amylase, which is present in a fragment corresponding to amino acid residues 322-346 of the amino acid sequence of SEQ ID No. 2, has/have been deleted or replaced with one or more amino acid residues, which is/are present in an amino acid fragment corresponding to amino acid residues 291-313 of the amino acid sequence shown in SEQ ID No. 10, or in which one or more additional amino acid residues has/have been inserted using the relevant part of SEQ ID No. 10 or a corresponding part of another Fungamyl-like ⁇ -amylase as a template.
- the variant may be one, in which the amino acid fragment X-Y of the parent ⁇ -amylase, which corresponds to or is within the amino acid fragment 322-346 of SEQ ID No. 2, has/have been replaced with an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 291-313 of the amino acid sequence shown in SEQ ID No. 10, in which variant
- X is an amino acid residue corresponding to the amino acid occupying position 322, 323, 324 or 325 of SEQ ID No. 2,
- Y is an amino acid residue corresponding to the amino acid occupying position 343, 344, 345 or 346 of SEQ ID No. 2
- Z is an amino acid residue corresponding to the amino acid occupying position 291, 292, 293 or 294 of SEQ ID No. 10
- V is an amino acid residue corresponding to the amino acid occupying position 310, 311, 312 or 313 of SEQ ID No. 10.
- a specific variant according to this aspect of the invention is one, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 325-345 of SEQ D No. 2, has been replaced with the amino acid fragment corresponding to amino acid residues 294-313 of the amino acid sequence shown in SEQ ID No. 10.
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, which exhibits ⁇ -amylase activity and which has a decreased Ca 2+ dependency as compared to the parent ⁇ -amylase.
- the decreased Ca 2+ dependency has the functional result that the variant exhibits a satisfactory amylolytic activity in the presence of a lower concentration of calcium ion in the extraneous medium than is necessary for the parent enzyme and, for example, therefore is less sensitive than the parent to calcium ion-depleting conditions such as those obtained in media containing calcium-complexing agents (such as certain detergent builders).
- the decreased Ca 2+ dependency of the variant of the invention may advantageously be achieved by increasing the Ca 2+ binding affinity of the parent Termamyl-like ⁇ -amylase, in other words the stronger the Ca 2+ binding of the enzyme, the lower is the Ca 2+ dependency.
- amino acid residues located within 10A from a sodium or calcium ion are involved in or are of importance for the Ca 2+ binding capability of the enzyme.
- the variant according to this aspect of the invention is preferably one, which has been modified in one or more amino acid residues present within 10 ⁇ from a calcium and/or sodium ion identified in the three-dimensional Termamyl-like ⁇ -amylase structure in such a manner that the affinity of the ⁇ -amylase for calcium is increased.
- amino acid residues found within a distance of 10 ⁇ from the Ca 2+ binding sites of the B. licheniformis ⁇ -amylase with the amino acid sequence SEQ ID NO 2 were determined as described in Example 2 and are as follows:
- the identification and subsequent modification of the amino acid residue is performed by the following method: i) identifying an amino acid residue within 10A from a Ca 2+ binding site of a Termamyl-like ⁇ -amylase structure, which from structural or functional considerations is believed to be responsible for a non-optimal calcium ion interaction, ii) constructing a variant in which said amino acid residue is replaced with another amino acid residue which from structural or functional considerations is believed to be important for establishing a higher Ca 2+ binding affinity, and testing the Ca 2+ dependency of the resulting Termamyl-like ⁇ -amylase variant.
- non-optimal calcium ion interaction is intended to indicate that the amino acid residue in question is selected on the basis of a presumption that substituting said amino acid residue for another may improve a calcium ion binding interaction of the enzyme.
- the amino acid residue in question may be selected on the basis of one or more of the following considerations :
- Termamyl-like ⁇ -amylase e.g. by stabilizing the contacts between the A, B and C domains or stabilizing one or more of the domains as such.
- This may, e.g., be achieved by providing for a better coordination to amino acid side chains, which may, e.g., be obtained by replacing an N residue with a D residue and/or a Q residue with an E residue (e.g. N104D), e.g. within 10A, and preferably within 3 or 4A, of a calcium binding site.
- the amino acid residue to be modified is located within 8A of a Ca 2+ binding site residue, such as within 5 ⁇ of such residue.
- the amino acid residues within 8A and 5 ⁇ respectively, may easily be identified by an analogous method used for identifying amino acid residues within 10A (cf. Example 2).
- N104D (of the B . licheniformis ⁇ -amylase SEQ ID NO 2, or an equivalent (N to D) mutation of an equivalent position in another Termamyl-like ⁇ -amylase.)
- substitutions of relevance for Ca 2+ dependency appear to be of importance in stabilizing the enzyme conformation (for instance the Domains A-B and/or Domains A-C interactions contributing to the overall stability of the enzyme) in that they may, e.g., enhance the strength of binding or retention of calcium ion or sodium ion at or within a calcium or sodium binding site, respectively, within the parent Termamyl-like ⁇ -amylase. It is desirable to stabilize the C-domain in order to increase the calcium stability and/or thermostability of the enzyme. In this connection the stabilization may result in a stabilization of the binding of calcium by the enzyme, and an improved contact between the C-domain and the A-domain (of importance for thermostability).
- the latter may be achieved by introduction of cystein bridges, salt bridges or increase hydrogen, hydrophobic and/or electrostatic interactions.
- cystein bridges for instance, the C-domain of the B . licheniformis ⁇ -amylase having the amino acid sequence shown in SEQ ID No. 2 may be stabilized by introduction of a cystein bridge between domain A and domain C, e.g. by introducing of the following mutations: A349C+I479C and/or L346C+I430C.
- a salt bridge may be obtained by introduction of the following mutations:
- the calcium site of Domain C may be stabilized by replacing the amino acid residues H408 and/or G303 with any other amino acid residue.
- substitution mutations which appear to be of importance, inter alia , in the context of reducing calcium dependency include the following: R23K, H156Y, A181T, A209V and G310D (or equivalent mutations in equivalent positions in another Termamyl-like ⁇ -amylase). Substitutions of R214 and P345 with other amino acids may also be of importancen in this connection.
- This may, e.g., be accomplished by the following method: i) in a structure of the Termamyl-like ⁇ -amylase in question to identifying an amino acid residue within 15A from an active site residue, in particulular 10A from an active site residue, which amino acid residue is contemplated to be involved in electrostatic or hydrophobic interactions with an active site residue, ii) replacing, in the structure, said amino acid residue with an amino acid residue which changes the electrostatic and/or hydrophobic surroundings of an active site residue and evaluating the accomodation of the amino acid residue in the structure, iii) optionally repeating step i) and/or ii) until an amino acid replacement has been identified which is accomodated into the structure, iv) constructing a Termamyl-like ⁇ -amylase variant resulting from steps i), ii) and optionally iii) and testing the pH dependent enzymatic activity of interest of said variant.
- the invention relates to a variant of a Termamyl-like ⁇ -amylase which exhibits a higher activity at a lower pH (e.g. compared to the pH optimum) than the parent ⁇ -amylase.
- the variant comprises a mutation of an amino acid residue corresponding to at least one of the following positions of the B . licheniformis ⁇ -amylase (SEQ ID NO 2) :
- A232T, S , G or any combination of two or more of these variants or any combination of one or more of these variants with any of the other variants disclosed herein.
- the invention relates to a variant of a Termamyl-like ⁇ -amylase which has a higher activity at a higher pH than the parent ⁇ -amylase.
- the variant comprises a mutation of an amino acid residue corresponding to at least one of the following positions of the B . licheniformis ⁇ -amylase (SEQ ID NO 2) :
- the variant comprises a mutation corresponding to at least one of the following mutations of the B. licheniformis ⁇ -amylase (SEQ ID NO 2) : N326I,Y,F,L,V
- a mutation which appears to be importance in relation to the specific activity of variants of the invention is a mutation corresponding to the substitution S187D in B . licheniformis ⁇ -amylase (SEQ ID NO 2).
- the invention relates to a variant of a parent Termamyl-like ⁇ -amylase, which variant is the result of one or more amino acid residues having been deleted from, replaced or added to the parent ⁇ -amylase so as to obtain an increased thermostability of the variant.
- the Termamyl-like ⁇ -amylase structure contains a number of unique internal holes, which may contain water, and a number of crevices.
- a number of holes and crevices may be desirable to reduce the number of holes and crevices (or reduce the size of the holes or crevices), e.g. by introducing one or more hydrophobic contacts, preferably achieved by introducing bulkier residues, in the vicinity or surroundings of the hole.
- the amino acid residues to be modified are those which are involved in the formation of the hole.
- the present invention relates to a method of increasing the thermostability and/or altering the temperature optimum of a parent Termamyl-like ⁇ -amylase, which method comprises i) identifying an internal hole or a crevice of the parent Termamyl-like ⁇ -amylase in the three-dimensional structure of said ⁇ -amylase, ii) replacing, in the structure, one or more amino acid residues in the neighbourhood of the hole or crevice identified in i) with another amino acid residue which from structural or functional considerations is believed to increase the hydrophobic interaction and to fill out or reduce the size of the hole or crevice,
- the structure used for identifying the hole or crevice of the parent Termamyl-like ⁇ -amylase may be the structure identified in Appendix 1 or a model structure of the parent Termamyl-like ⁇ -amylase built thereon. It will be understood that the hole or crevice is identified by the amino acid residues surrounding the hole/crevice, and that modification of said amino acid residues are of importance for filling or reducing the size of the hole/crevice.
- the particular amino acid residues referred to below are those which in crystal structure have been found to flank the hole/crevice in question.
- SEQ ID NO 2 (SEQ ID NO 2) is contemplated: L61, Y62, F67, K106, G145, 1212, S151, R214, Y150, F143, R146
- Termamyl-like ⁇ -amylase which comprises a mutation corresponding to the following mutations (using the numbering of B. licheniformis ⁇ -amylase (SEQ ID NO 2):
- L241, 1236 Of interest is a mutation to a more bulky amino acid residue. Of particular interest is a variant of a Termamyl-like ⁇ -amylase which comprises a mutation corresponding to one or more of the following mutations in the B . licheniformis ⁇ -amylase: L241I,F,Y,W; and/or
- L7, V259, F284 Of interest is a mutation to a more bulky amino acid residue.
- Termamyl-like ⁇ -amylase which comprises a mutation corresponding to one or more of the following mutations in the B. licheniformis ⁇ -amylase:
- F284W In order to fill a hole in the vicinity of the active site mutation to any other amino acid residue of an amino acid residue corresponding to one or more of the following residues of the B. licheniformis ⁇ -amylase (SEQ ID NO 2) is contemplated:
- Termamyl-like ⁇ -amylase which comprises a mutation corresponding to one or more of the following mutations in the B. licheniformis ⁇ -amylase: F350W F343W
- Termamyl-like ⁇ -amylase which comprises a mutation corresponding to one or more of the following mutations in the B . licheniformis ⁇ -amylase:
- V481,F,I,L,W Variants with an altered cleavage pattern V481,F,I,L,W Variants with an altered cleavage pattern
- an ⁇ -amylase which is capable of degrading the starch molecules into long branched oligo saccharides (like, e.g. the Fungamyl-like ⁇ -amylases) rather than shorter branched oligo saccharides (like conventional Termamyl-like ⁇ -amylases).
- the resulting very small branched oligosaccharides (panose precursors) cannot be hydrolyzed properly by pullulanases, which in the liquefaction process are used after the ⁇ -amylases and before the amyloglucosidases.
- one aim of the present invention is to change the degradation characteristics of a Termamyl-like ⁇ -amylase to that of a Fungamyl-like ⁇ -amylases without at the same time reducing the thermostability of the Termamyl-like ⁇ -amylase.
- the invention relates to a variant of a Termamyl-like ⁇ -amylase which has a reduced ability to cleave a substrate close to the branching point.
- the variant may suitably be constructed by a method which comprises i) identifying the substrate binding area of the parent Termamyl-like ⁇ -amylase in a model of the three-dimensional structure of said ⁇ -amylase, (e.g.
- iii) constructing a Termamyl-like ⁇ -amylase variant resulting from step ii) and testing the substrate cleavage pattern of the variant.
- Residues of particular interest in connection with this aspect of the invention correspond to the following residues of the B . licheniformis ⁇ -amylase (SEQ ID NO 2): V54, D53, Y56, Q333, G57, and the variants according to this aspect preferably comprises a mutation in one or more of these residues.
- the variant comprises at least one of the following mutations, which are expected to prevent cleavage close to the branching point :
- A52amino acid residues larger than A e.g. A52W, Y,L, F, I.
- Variants of a fungal ⁇ -amylase e.g. A52W, Y,L, F, I.
- the invention relates to a variant of a parent Fungamyl-like ⁇ -amylase, in which variant at least one of the amino acid residues of the parent ⁇ -amylase, which is/are present in an amino acid fragment corresponding to amino acid residues 291-313 of the amino acid sequence of SEQ ID No. 10, has/have been deleted or replaced with one or more of the amino acid residues, which is/are present in an amino acid fragment corresponding to amino acid residues 98-210 of the amino acid sequence shown in SEQ ID No. 4, or in which one or more additional amino acid residues has/have been inserted using the relevant part of SEQ ID No. 4 or a corresponding part of another Termamyl-like ⁇ -amylase as a template.
- the variant may be one, in which the amino acid fragment X-Y of the parent ⁇ -amylase, which corresponds to or is within the amino acid fragment 117-185 of SEQ ID No. 10, has/have been replaced with an amino acid fragment Z-V, which corresponds to or is within the amino acid fragment 98-210 of the amino acid sequence shown in SEQ ID No. 4, in which variant X is an amino acid residue corresponding to the amino acid occupying position 117, 118, 119, 120 or 121 of SEQ ID No. 10,
- Y is an amino acid residue corresponding to the amino acid occupying position 181, 182, 183, 184 or 185 of SEQ ID No. 10,
- Z is an amino acid residue corresponding to the amino acid occupying position 98, 99, 100, 101 or 102 of SEQ ID No. 4
- V is an amino acid residue corresponding to the amino acid occupying position 206, 207, 208, 209 or 210 of SEQ ID No. 4.
- a specific example of a variant according to this aspect of the invention is one, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 121-181 of SEQ ID No. 10, has been replaced with the amino acid fragment corresponding to amino acid residues 102-206 of the amino acid sequence shown in SEQ ID No. 4.
- Another example of a variant according to this aspect of the invention is one, in which the amino acid fragment of the parent ⁇ -amylase, which corresponds to amino acid residues 121-174 of SEQ ID No. 10, has been replaced with the amino acid fragment corresponding to amino acid residues 102-199 of the amino acid sequence shown in SEQ ID No. 4.
- the invention relates to a variant of a parent Fungamyl-like ⁇ -amylase, in which an amino acid fragment corresponding to amino acid residues 181-184 of the amino acid sequence shown in SEQ ID No. 10 has been deleted.
- the variant of the invention or prepared in accordance with the method of the invention comprises one or more modifications in addition to those outlined above.
- one or more proline residues present in the part of the ⁇ -amylase variant having been modified is/are replaced with a non-proline residue which may be any of the possible, naturally occurring non-proline residues, and which preferably is an alanine, glycine, serine, threonine, valine or leucine.
- cysteine residues present in the amino acid residues with which the parent ⁇ -amylase is modified are replaced with a non-cysteine residues such as serine, alanine, threonine, glycine, valine or leucine.
- the variant of the invention may either as the only modification or in combination with any of the above outlined modifications be modified so that one or more Asp and/or Glu present in an amino acid fragment corresponding to the amino acid fragment 185-209 of SEQ ID No. 8 is replaced by an Asn and/or Gin, respectively.
- the modification of one or more of the Lys residues present in the Termamyl-like ⁇ -amylase is replaced by an Arg present in an amino acid fragment corresponding to the amino acid fragment 185-209 of SEQ ID No. 8 is replaced by an Asn and/or Gln, respectively.
- variants may be prepared which carry two or more of the above outlined modifications.
- variants may be prepared which comprises a modification in the loop 1 and loop 2 region, a modification in loop 2 and limited loop 3, a modification in loop 1, loop 2, loop 3 and loop 8, etc.
- the DNA sequence encoding a parent ⁇ -amylase may be isolated from any cell or microorganism producing the ⁇ -amylase in question, using various methods well known in the art.
- a genomic DNA and/or cDNA library should be constructed using chromosomal DNA or messenger RNA from the organism that produces the ⁇ -amylase to be studied.
- homologous, labelled oligonucleotide probes may be synthesized and used to identify ⁇ -amylase-encoding clones from a genomic library prepared from the organism in question.
- a labelled oligonucleotide probe containing sequences homologous to a known ⁇ -amylase gene could be used as a probe to identify ⁇ -amylase-encoding clones, using hybridization and washing conditions of lower stringency.
- Yet another method for identifying ⁇ -amylase-encoding clones would involve inserting fragments of genomic DNA into an expression vector, such as a plasmid, transforming ⁇ -amylase-negative bacteria with the resulting genomic DNA library, and then plating the transformed bacteria onto agar containing a substrate for ⁇ -amylase, thereby allowing clones expressing the ⁇ -amylase to be identified.
- the DNA sequence encoding the enzyme may be prepared synthetically by established standard methods, e.g. the phosphoroamidite method described by S.L. Beaucage and M.H. Caruthers (1981) or the method described by Matthes et al. (1984).
- phosphoroamidite method oligonucleotides are synthesized, e.g. in an automatic DNA synthesizer, purified, annealed, ligated and cloned in appropriate vectors.
- the DNA sequence may be of mixed genomic and synthetic origin, mixed synthetic and cDNA origin or mixed genomic and cDNA origin, prepared by ligating fragments of synthetic, genomic or cDNA origin (as appropriate, the fragments corresponding to various parts of the entire DNA sequence), in accordance with standard techniques.
- the DNA sequence may also be prepared by polymerase chain reaction (PCR) using specific primers, for instance as described in US 4,683,202 or R.K. Saiki et al. (1988).
- mutations may be introduced using synthetic oligonucleotides. These oligonucleotides contain nucleotide sequences flanking the desired mutation sites; mutant nucleotides are inserted during oligonucleotide synthesis.
- a single-stranded gap of DNA, bridging the ⁇ -amylase-encoding sequence is created in a vector carrying the ⁇ -amylase gene.
- the synthetic nucleotide, bearing the desired mutation is annealed to a homologous portion of the single-stranded DNA.
- Random mutagenesis is suitably performed either as localized or region-specific random mutagenesis in at least three parts of the gene translating to the amino acid sequence shown in question, or within the whole gene.
- codon positions corresponding to the following amino acid residues of the B. licheniformis ⁇ -amylase may appropriately be targeted:
- the random mutagenesis of a DNA sequence encoding a parent ⁇ -amylase to be performed in accordance with step a) of the above-described method of the invention may conveniently be performed by use of any method known in the art.
- the random mutagenesis may be performed by use of a suitable physical or chemical mutagenizing agent, by use of a suitable oligonucleotide, or by subjecting the DNA sequence to PCR generated mutagenesis.
- the random mutagenesis may be performed by use of any combination of these mutagenizing agents.
- the mutagenizing agent may, e.g., be one which induces transitions, transversions, inversions, scrambling, deletions, and/or insertions.
- Examples of a physical or chemical mutagenizing agent suitable for the present purpose include ultraviolet (UV) irradiation, hydroxylamine, N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), O-methyl hydroxylamine, nitrous acid, ethyl methane sulphonate (EMS), sodium bisulphite, formic acid, and nucleotide analogues.
- UV ultraviolet
- MNNG N-methyl-N'-nitro-N-nitrosoguanidine
- EMS ethyl methane sulphonate
- sodium bisulphite formic acid
- nucleotide analogues examples include ultraviolet (UV) irradiation, hydroxylamine, N-methyl-N'-nitro-N-nitrosoguanidine (MNNG), O-methyl hydroxylamine, nitrous acid, ethyl methane sulphonate (EMS), sodium bisulphite, formic acid, and nucleotide ana
- the mutagenesis is typically performed by incubating the DNA sequence encoding the parent enzyme to be mutagenized in the presence of the mutagenizing agent of choice under suitable conditions for the mutagenesis to take place, and selecting for mutated DNA having the desired properties.
- the oligonucleotide may be doped or spiked with the three non-parent nucieotides during the synthesis of the oligonucleo tide at the positions which are to be changed.
- the doping or spiking may be done so that codons for unwanted amino acids are avoided.
- the doped or spiked oligonucleotide can be incorporated into the DNA encoding the amylolytic enzyme by any published technique, using e.g. PCR, LCR or any DNA polymerase and ligase.
- PCR-generated mutagenesis When PCR-generated mutagenesis is used, either a chemically treated or non-treated gene encoding a parent ⁇ -amylase enzyme is subjected to PCR under conditions that increase the mis-incorporation of nucleotides (Deshler 1992; Leung et al., Technique, Vol.1, 1989, pp. 11-15).
- a mutator strain of E. coli (Fowler et al., Molec. Gen. Genet., 133, 1974, pp. 179-191), S. cereviseae or any other microbial organism may be used for the random mutagenesis of the DNA encoding the amylolytic enzyme by e.g. transforming a plasmid containing the parent enzyme into the mutator strain, growing the mutator strain with the plasmid and isolating the mutated plasmid from the mutator strain. The mutated plasmid may subsequently be transformed into the expression organism.
- the DNA sequence to be mutagenized may conveniently be present in a genomic or cDNA library prepared from an organism expressing the parent amylolytic enzyme.
- the DNA sequence may be present on a suitable vector such as a plasmid or a bacteriophage, which as such may be incubated with or otherwise exposed to the mutagenizing agent.
- the DNA to be mutagenized may also be present in a host cell either by being integrated in the genome of said cell or by being present on a vector harboured in the cell.
- the DNA to be mutagenized may be in isolated form. It will be understood that the DNA sequence to be subjected to random mutagenesis is preferably a cDNA or a genomic DNA sequence.
- the mutated DNA is expressed by culturing a suitable host cell carrying the DNA sequence under conditions allowing expression to take place.
- the host cell used for this purpose may be one which has been transformed with the mutated DNA sequence, optionally present on a vector, or one which was carried the DNA sequence encoding the parent enzyme during the mutagenesis treatment.
- suitable host cells are the following: grampositive bacteria such as Bacillus subtilis, Bacillus licheniformis, Bacillus lentus, Bacillus brevis, Bacillus stearothermophilus, Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillus coagulans, Bacillus circulans, Bacillus lautus, Bacillus megaterium, Bacillus thuringiensis, Streptomyces lividans or Strep tomyces murinus; and gramnegative bacteria such as E. coli .
- grampositive bacteria such as Bacillus subtilis, Bacillus licheniformis, Bacillus lentus, Bacillus brevis, Bacillus stearothermophilus, Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillus coagulans, Bacillus circulans, Bacillus lautus, Bacillus megaterium, Bacillus thuringiensis, Streptomyces l
- the mutated DNA sequence may further comprise a DNA sequence encoding functions permitting expression of the mutated DNA sequence.
- the random mutagenesis may advantageously be localized to a part of the parent ⁇ -amylase in question. This may, e.g., be advantageous when certain regions of the enzyme have been identified to be of particular importance for a given property of the enzyme, and when modified are expected to result in a variant having improved properties. Such regions may normally be identified when the tertiary structure of the parent enzyme has been elucidated and related to the function of the enzyme.
- the localized random mutagenesis is conveniently performed by use of PCR- generated mutagenesis techniques as described above or any other suitable technique known in the art.
- the DNA sequence encoding the part of the DNA sequence to be modified may be isolated, e.g. by being inserted into a suitable vector, and said part may subsequently be subjected to mutagenesis by use of any of the mutagenesis methods discussed above.
- a microorganism capable of expressing the mutated amylolytic enzyme of interest is incubated on a suitable medium and under suitable conditions for the enzyme to be secreted, the medium being provided with a double filter comprising a first protein-binding filter and on top of that a second filter exhibiting a low protein binding capability.
- the microorganism is located on the second filter.
- the first filter comprising enzymes secreted from the microorganisms is separated from the second filter comprising the microorganisms.
- the first filter is subjected to screening for the desired enzymatic activity and the corresponding microbial colonies present on the second filter are identified.
- the filter used for binding the enzymatic activity may be any protein binding filter e.g. nylon or nitrocellulose.
- the top-filter carrying the colonies of the expression organism may be any filter that has no or low affinity for binding proteins e.g. cellulose acetate or DuraporeTM.
- the filter may be pretreated with any of the conditions to be used for screening or may be treated during the detection of enzymatic activity.
- the enzymatic activity may be detected by a dye, fluorescence, precipitation, pH indicator, IR-absorbance or any other known technique for detection of enzymatic activity.
- the detecting compound may be immobilized by any immobilizing agent e.g. agarose, agar, gelatine, polyacrylamide, starch, filter paper, cloth; or any combination of immobilizing agents.
- ⁇ -Amylase activity is detected by Cibacron Red labelled amylopectin, which is immobilized on agarose.
- the filter with bound ⁇ -amylase variants is incubated in a buffer at pH 10.5 and 60° or 65°C for a specified time, rinsed briefly in deionized water and placed on the amylopectin-agarose matrix for activity detection. Residual activity is seen as lysis of Cibacron Red by amylopectin degradation.
- the conditions are chosen to be such that activity due to the ⁇ -amylase having the amino acid sequence shown in SEQ ID No.1 can barely be detected.
- Stabilized variants show, under the same conditions, increased colour intensity due to increased liberation of Cibacron Red.
- the filter with bound variants is placed directly on the amylopectin-Cibacron Red substrate plate and incubated at the desired temperature (e.g. 4°C, 10°C or 30°C) for a specified time.
- the testing of variants of the invention may suitably be performed by determining the starch-degrading activity of the variant, for instance by growing host cells transformed with a DNA sequence encoding a variant on a starch-containing agarose plate and identifying starch-degrading host cells. Further testing as to altered properties (including specific activity, substrate specificity, cleavage pattern, thermoactivation, pH optimum, pH dependency, temperature optimum, and any other parameter) may be performed in accordance with methods known in the art.
- a DNA sequence encoding the variant produced by methods described above, or by any alternative methods known in the art can be expressed, in enzyme form, using an expression vector which typically includes control sequences encoding a promoter, operator, ribosome binding site, translation initiation signal, and, optionally, a repressor gene or various activator genes.
- the recombinant expression vector carrying the DNA sequence encoding an ⁇ -amylase variant of the invention may be any vector which may conveniently be subjected to recombinant DNA procedures, and the choice of vector will often depend on the host cell into which it is to be introduced.
- the vector may be an autonomously replicating vector, i.e.
- a vector which exists as an extrachromosomal entity, the replication of which is independent of chromosomal replication e.g. a plasmid, a bacteriophage or an extrachromosomal element, minichromosome or an artificial chromosome.
- the vector may be one which, when introduced into a host cell, is integrated into the host cell genome and replicated together with the chromosome (s) into which it has been integrated.
- the DNA sequence should be operably connected to a suitable promoter sequence.
- the promoter may be any DNA sequence which shows transcriptional activity in the host cell of choice and may be derived from genes encoding proteins either homologous or heterologous to the host cell.
- suitable promoters for directing the transcription of the DNA sequence encoding an ⁇ -amylase variant of the invention, especially in a bacterial host are the promoter of the lac operon of E.
- the Streptomyces coelicolor agarase gene dagA promoters the promoters of the Bacillus li cheniformis ⁇ - amylase gene (amyL), the promoters of the Bacillus stearothermophilus maltogenic amylase gene ( amyM), the promoters of the Bacillus amyloliquefaciens ⁇ -amylase ( amyQ), the promoters of the Bacillus subtilis xylA and xylB genes etc.
- useful promoters are those derived from the gene encoding A .
- oryzae TAKA amylase Rhizomucor miehei aspartic proteinase, A . niger neutral ⁇ -amylase, A. niger acid stable ⁇ -amylase, A . niger glucoamylase, Rhizomucor miehei lipase, A . oryzae alkaline protease, A. oryzae triose phosphate isomerase or A . nidulans acetamidase.
- the expression vector of the invention may also comprise a suitable transcription terminator and, in eukaryotes, polyadenylation sequences operably connected to the DNA sequence encoding the ⁇ -amylase variant of the invention. Termination and polyadenylation sequences may suitably be derived from the same sources as the promoter.
- the vector may further comprise a DNA sequence enabling the vector to replicate in the host cell in question. Examples of such sequences are the origins of replication of plasmids pUC19, pACYC177, pUB110, pE194, pAMB1 and pIJ702.
- the vector may also comprise a selectable marker, e.g.
- the vector may comprise Aspergillus selection markers such as amdS, argB, niaD and sC, a marker giving rise to hygromycin resistance, or the selection may be accomplished by co-transformation, e.g. as described in WO 91/17243. While intracellular expression may be advantageous in some respects, e.g. when using certain bacteria as host cells, it is generally preferred that the expression is extracellular.
- the Bacill us ⁇ -amylases mentioned herein comprise a preregion permitting secretion of the expressed protease into the culture medium. If desirable, this preregion may be replaced by a different preregion or signal sequence, conveniently accomplished by substitution of the DNA sequences encoding the respective preregions.
- the cell of the invention is advantageously used as a host cell in the recombinant production of an ⁇ -amylase variant of the invention.
- the cell may be transformed with the DNA construct of the invention encoding the variant, conveniently by integrating the DNA construct (in one or more copies) in the host chromosome. This integration is generally considered to be an advantage as the DNA sequence is more likely to be stably maintained in the cell. Integration of the DNA constructs into the host chromosome may be performed according to conventional methods, e.g. by homologous or heterologous recombination. Alternatively, the cell may be transformed with an expression vector as described above in connection with the different types of host cells.
- the cell of the invention may be a cell of a higher organism such as a mammal or an insect, but is preferably a microbial cell, e.g. a bacterial or a fungal (including yeast) cell.
- a microbial cell e.g. a bacterial or a fungal (including yeast) cell.
- suitable bacteria are grampositive bacteria such as Bacillus subtilis, Bacillus licheniformis, Bacillus lentus, Bacillus brevis, Bacillus stearothermophilus, Bacillus alkalophilus, Bacillus amyloliquefaciens, Bacillus coagulans, Bacillus circulans, Bacillus lautus, Bacillus megaterium, Bacillus thuringiensis, or Streptomyces lividans or Streptomyces murinus , or gramnegative bacteria such as E.coli.
- the transformation of the bacteria may, for instance, be effected by protoplast transformation or by using competent cells in a manner known per se.
- the yeast organism may favourably be selected from a species of Saccharomyces or Schizosaccharomyces, e.g. Saccharomyces cerevisiae.
- the filamentous fungus may advantageously belong to a species of Aspergillus, e . g . Aspergillus oryzae or Aspergil lus niger.
- Fungal cells may be transformed by a process involving protoplast formation and transformation of the protoplasts followed by regeneration of the cell wall in a manner known per se . A suitable procedure for transformation of Aspergillus host cells is described in EP 238 023.
- the present invention relates to a method of producing an ⁇ -amylase variant of the invention, which method comprises cultivating a host cell as described above under conditions conducive to the production of the variant and recovering the variant from the cells and/or culture medium.
- the medium used to cultivate the cells may be any conventional medium suitable for growing the host cell in question and obtaining expression of the ⁇ -amylase variant of the invention. Suitable media are available from commercial suppliers or may be prepared according to published recipes (e.g. as described in catalogues of the American Type Culture Collection).
- the ⁇ -amylase variant secreted from the host cells may conveniently be recovered from the culture medium by well-known procedures, including separating the cells from the medium by centrifugation or filtration, and precipitating proteinaceous components of the medium by means of a salt such as ammonium sulphate, followed by the use of chromatographic procedures such as ion exchange chromatography, affinity chromatography, or the like.
- the ⁇ -amylase variants of this invention possesses valuable properties allowing for various industrial applications.
- the enzyme variants finds potential applications as a component in washing, dishwashing and hard surface cleaning detergent compositions, but it may also be useful in the production of sweeteners and ethanol from starch and for textile desizing.
- Conditions for conventional starch converting processes and liquefaction and/or saccharification processes are described in for instance US Patent No. 3,912,590 and EP patent publications Nos. 252,730 and 63,909.
- a "traditional" process for conversion of starch to fructose syrups normally consists of three consecutive enzymatic processes, viz. a liquefaction process followed by a saccharification process and an isomerization process.
- starch is degraded to dextrins by an ⁇ -amylase (e.g. TermamylTM) at pH values between 5.5 and 6.2 and at temperatures of 95-160°C for a period of approx. 2h.
- ⁇ -amylase e.g. TermamylTM
- 1mM of calcium is added (40 ppm free calcium ions).
- the dextrins are converted into dextrose by addition of a glucoamylase (e.g. AMGTM) and a debranching enzyme, such as an isoamylase or a pullulanase
- a glucoamylase e.g. AMGTM
- a debranching enzyme such as an isoamylase or a pullulanase
- the pH is increased to a value in the range of 6-8, preferably pH 7.5, and the calcium is removed by ion exchange.
- the dextrose syrup is then converted into high fructose syrup using, e.g., an immmobilized glucoseisomerase (such as SweetzymeTM).
- an immmobilized glucoseisomerase such as SweetzymeTM.
- All three improvements could be seen as individual benefits, but any combination (e.g. 1+2, 1+3, 2+3 or 1+2+3) could be employed:
- a less calcium-dependent Termamyl-like ⁇ -amylase which is stable and highly active at low concentrations of free calcium ( ⁇ 40 ppm) is required.
- Such a Termamyl-like ⁇ -amylase should have a pH optimum at a pH in the range of 4.5-6.5, preferably in the range of 4.5-5.5.
- licheniformis generates "limit dextrins" (which are poor substrates for B . acidopullulyticus pullulanase) by hydrolysing 1,4-alphaglucosidic linkages close to and on both sides of the branching points in amylopectin. Hydrolysis of these limit dextrins by glucoamylase leads to a build-up of the trisaccharide panose, which is only slowly hydrolysed by glucoamylase. The development of a thermostable ⁇ -amylase which does not suffer from this disadvantage would be a significant process improvement, as no separate inactivation step would be required. If a Termamyl-like, low-pH-stable ⁇ -amylase is developed, an alteration of the specificity could be an advantage needed in combination with increased stability at low pH.
- the ⁇ -amylase may typically be a component of a detergent composition.
- it may be included in the detergent composition in the form of a non-dusting granulate, a stabilized liquid, or a protected enzyme.
- Non-dusting granulates may be produced, e.g. as disclosed in US 4,106,991 and 4,661,452 (both to Novo Industri A/S) and may optionally be coated by methods known in the art.
- waxy coating materials are poly (ethylene oxide) products (polyethyleneglycol, PEG) with mean molar weights of 1000 to 20000, ethoxylated nonylphenols having from 16 to 50 ethylene oxide units; ethoxylated fatty alcohols in which the alcohol contains from 12 to 20 carbon atoms and in which there are 15 to 80 ethylene oxide units; fatty alcohols; fatty acids; and mono- and di- and triglycerides of fatty acids.
- PEG poly (ethylene oxide) products
- mean molar weights 1000 to 20000, ethoxylated nonylphenols having from 16 to 50 ethylene oxide units; ethoxylated fatty alcohols in which the alcohol contains from 12 to 20 carbon atoms and in which there are 15 to 80 ethylene oxide units; fatty alcohols; fatty acids; and mono- and di- and triglycerides of fatty acids.
- Liquid enzyme preparations may, for instance, be stabilized by adding a polyol such as propylene glycol, a sugar or sugar alcohol, lactic acid or boric acid according to established methods.
- a polyol such as propylene glycol, a sugar or sugar alcohol, lactic acid or boric acid according to established methods.
- Other enzyme stabilizers are well known in the art.
- Protected enzymes may be prepared according to the method disclosed in EP 238,216.
- the detergent composition of the invention may be in any convenient form, e.g. as powder, granules, paste or liquid.
- a liquid detergent may be aqueous, typically containing up to 70% of water and 0-30% of organic solvent, or nonaqueous.
- the detergent composition comprises one or more surfactants, each of which may be anionic, nonionic, cationic, or zwitterionic.
- the detergent will usually contain 0-50% of anionic surfactant such as linear alkylbenzenesulfonate (LAS), alpha-olefinsulfonate (AOS), alkyl sulfate (fatty alcohol sulfate) (AS), alcohol ethoxysulfate (AEOS or AES) , secondary alkanesulfonates (SAS), alpha-sulfo fatty acid methyl esters, alkyl-or alkenylsuccinic acid or soap.
- anionic surfactant such as linear alkylbenzenesulfonate (LAS), alpha-olefinsulfonate (AOS), alkyl sulfate (fatty alcohol sulfate) (AS), alcohol ethoxysulfate (AEOS or AES) , secondary alkanesulfonates (SAS),
- Nonionic surfactant such as alcohol ethoxylate (AEO or AE), carboxylated alcohol ethoxylates, nonylphenol ethoxylate, alkylpolyglycoside, alkyldimethylamineoxide, ethoxylated fatty acid monoethanolamide, fatty acid monoethanolamide, or polyhydroxy alkyl fatty acid amide (e.g. as described in WO 92/06154).
- the detergent composition may additionally comprise one or more other enzymes, such as lipase, cutinase, protease, cellulase, peroxidase, e.g., laccase.
- the detergent may contain 1-65% of a detergent builder or complexing agent such as zeolite, diphosphate, triphosphate, phosphonate, citrate, nitrilotriacetic acid (NTA), ethylene-diaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTMPA), alkyl- or alkenylsuccinic acid, soluble silicates or layered silicates (e.g. SKS-6 from Hoechst).
- a detergent builder or complexing agent such as zeolite, diphosphate, triphosphate, phosphonate, citrate, nitrilotriacetic acid (NTA), ethylene-diaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTMPA), alkyl- or alkenylsuccinic acid, soluble silicates or layered silicates (e.g. SKS-6 from Hoechst).
- the detergent may also be unbuilt,
- the detergent may comprise one or more polymers.
- examples are carboxymethylcellulose (CMC), poly (vinylpyrrolidone) (PVP), polyethyleneglycol (PEG), poly (vinyl alcohol) (PVA) , polycarboxylates such as polyacrylates, maleic/acrylic acid copolymers and lauryl methacrylate/acrylic acid copolymers.
- CMC carboxymethylcellulose
- PVP poly (vinylpyrrolidone)
- PEG polyethyleneglycol
- PVA poly (vinyl alcohol)
- polycarboxylates such as polyacrylates, maleic/acrylic acid copolymers and lauryl methacrylate/acrylic acid copolymers.
- the detergent may contain a bleaching system which may comprise a H 2 O 2 source such as perborate or percarbonate which may be combined with a peracid-forming bleach activator such as tetraacetylethylenediamine (TAED) or nonanoyloxybenzene-sulfonate (NOBS).
- TAED tetraacetylethylenediamine
- NOBS nonanoyloxybenzene-sulfonate
- the bleaching system may comprise peroxy acids of e.g. the amide, imide, or sulfone type.
- the enzymes of the detergent composition of the invention may be stabilized using conventional stabilizing agents, e.g. a polyol such as propylene glycol or glycerol, a sugar or sugar alcohol, lactic acid, boric acid, or a boric acid derivative as e.g. an aromatic borate ester, and the composition may be formulated as described in e.g. WO 92/19709 and WO 92/19708.
- the detergent may also contain other conventional detergent ingredients such as e.g. fabric conditioners including clays, foam boosters, suds suppressors, anti-corrosion agents, soil- suspending agents, anti-soil redeposition agents, dyes, bactericides, optical brighteners, or perfume.
- the pH (measured in aqueous solution at use concentration) will usually be neutral or alkaline, e.g. 7-11.
- Particular forms of detergent compositions within the scope of the invention include:
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- An aqueous structured liquid detergent composition comprising
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- a detergent composition formulated as a granulate comprising 9) A detergent composition formulated as a granulate comprising
- An aqueous liquid detergent composition comprising
- An aqueous liquid detergent composition comprising
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- a detergent composition formulated as a granulate having a bulk density of at least 600 g/l comprising
- the manganese catalyst may, e.g., be one of the compounds described in "Efficient manganese catalysts for low-temperature bleaching", Nature 369, 1994, pp. 637-639.
- Detergent composition formulated as a nonaqueous detergent liquid comprising a liquid nonionic surfactant such as, e.g., linear alkoxylated primary alcohol, a builder system (e.g. phosphate), enzyme and alkali.
- the detergent may also comprise anionic surfactant and/or a bleach system.
- the ⁇ -amylase variant of the invention may be incorporated in concentrations conventionally employed in detergents. It is at present contemplated that, in the detergent composition of the invention, the ⁇ -amylase may be added in an amount correspon ding to 0.00001-1 mg (calculated as pure enzyme protein) of ⁇ -amylase per liter of wash liquor.
- the dishwashing detergent composition comprises a surfactant which may be anionic, non-ionic, cationic, amphoteric or a mixture of these types.
- the detergent will contain 0-90% of non-ionic surfactant such as low- to non-foaming ethoxylated propoxylated straight-chain alcohols.
- the detergent composition may contain detergent builder salts of inorganic and/or organic types.
- the detergent builders may be subdivided into phosphorus-containing and non-phosphorus-containing types.
- the detergent composition usually contains 1-90% of detergent builders.
- Examples of phosphorus-containing inorganic alkaline detergent builders when present, include the water-soluble salts especially alkali metal pyrophosphates, orthophosphates, and polyphosphates.
- suitable organic builders include the alkali metal, ammonium and substituted ammonium, citrates, succinates, malonates, fatty acid sulphonates, carboxymetoxy succinates, ammonium polyacetates, carboxylates, polycarboxylates, aminopolycarboxylates, polyacetyl carboxylates and polyhydroxsulphonates.
- dishwashing detergent composition may contain bleaching agents of the chlorine/bromine-type or the oxygen-type.
- inorganic chlorine/bromine-type bleaches are lithium, sodium or calcium hypochlorite and hypobromite as well as chlorinated trisodium phosphate.
- organic chlorine/bromine-type bleaches are heterocyclic N-bromo and N-chloro imides such as trichloroisocyanuric, tribromoisocyanuric, dibromoisocyanuric and dichloroisocyanuric acids, and salts thereof with water-solubilizing cations such as potassium and sodium.
- Hydantoin compounds are also suitable.
- the oxygen bleaches are preferred, for example in the form of an inorganic persalt, preferably with a bleach precursor or as a peroxy acid compound.
- suitable peroxy bleach compounds are alkali metal perborates, both tetrahydrates and monohydrates, alkali metal percarbonates, persilicates and perphosphates.
- Preferred activator materials are TAED and glycerol triacetate.
- the dishwashing detergent composition of the invention may be stabilized using conventional stabilizing agents for the enzyme (s), e.g. a polyol such as e.g.propylene glycol, a sugar or a sugar alcohol, lactic acid, boric acid, or a boric acid derivative, e.g. an aromatic borate ester.
- the dishwashing detergent composition of the invention may also contain other conventional detergent ingredients, e.g. deflocculant material, filler material, foam depressors, anti-corrosion agents, soil-suspending agents, sequestering agents, anti-soil redeposition agents, dehydrating agents, dyes, bactericides, fluorescers, thickeners and perfumes.
- ⁇ -amylase variant of the invention may be used in conventional dishwashing detergents, e.g. in any of the detergents described in any of the following patent publications:
- EP 346137 US 5112518, EP 318204, EP 318279, EP 271155,
- TERM The overall homology of the B. licheniformis ⁇ -amylase (in the following referred to as TERM) to other Termamyl-like ⁇ -amylases is high and the percent similarity is extremely high.
- TERM has a deletion of 2 residues between residue G180 and K181 compared to BAN and BSG.
- BSG has a deletion of 3 residues between G371 and 1372 in comparison with BAN and TERM. Further BSG has a C-terminal extension of more than 20 residues compared to BAN and TERM. BAN has 2 residues less and TERM has one residue less in the N-terminal compared to BSG.
- TERM differs in that it lacks two residues around 178-182.
- the HOMOLOGY program from BIOSYM was used to substitute the residues in equivalent positions in the structure (not only structurally conserved regions) except for the deletion point.
- the coordinates of Appendix 1 are read into the INSIGHT program provided by BIOSYM tecnologies.
- the spatial coordinates are presented showing the bonds between the atoms.
- the ions are presented as well as the water atoms.
- the program package part of creating subset are used to create a 10 ⁇ subset around the Calcium and the Sodium ions in the structure using the command ZONE. All residues having an atom within the 10 ⁇ are compiled and written out by the LIST MOLECULE command. By giving the ions the name ium in the coordinate file a 10 ⁇ sphere around all atoms called ium is compiled. The specific residues identified in this manner are given further above in the section entitled "Ca 2+ dependency".
- the solved structure exhibits many internal holes and cavities.
- the Connolly program is normally used (Lee, B. and Richards, F.M. (1971) J. Mol. Biol. 55,p. 379-400).
- the program uses a probe with radius to search the external and internal surface of the protein. The smallest hole observable in this way has the probe radius.
- Termamyl (SEQ ID NO. 2) is expressed in B . subtilis from a plasmid denoted pDN1528.
- This plasmid contains the complete gene encoding Termamyl, amyL, the expression of which is directed by its own promoter. Further, the plasmid contains the origin of replication, ori , from plasmid pUB110 and the cat gene from plasmid pC194 conferring resistance towards chloramphenicol.
- pDN1528 is shown in Fig. 9.
- a specific mutagenesis vector containing a major part of the coding region of SEQ ID NO 1 was prepared.
- the important features of this vector, denoted pJeEN1 include an origin of replication derived from the pUC plasmids, the cat gene conferring resistance towards chloramphenicol, and a frameshift-containing version of the bla gene, the wild type of which normally confers resistance towards ampicillin (amp R phenotype). This mutated version results in an amp s phenotype.
- the plasmid pJeEN1 is shown in Fig. 10, and the E.
- coli origin of replication, ori , bla, cat , the 5'-truncated version of the Termamyl amylase gene, and selected restriction sites are indicated on the plasmid. Mutations are introduced in amyL by the method described by Deng and Nickoloff (1992, Anal. Biochem. 200. pp. 81-88) except that plasmids with the "selection primer" (primer #6616; see below) incorporated are selected based on the amp R phenotype of transformed E. coli cells harboring a plasmid with a repaired bla gene, instead of employing the selection by restriction enzyme digestion outlined by Deng and Nickoloff. Chemicals and enzymes used for the mutagenesis were obtained from the ChameleonTM mutagenesis kit from Stratagene (catalogue number 200509).
- the truncated gene containing the desired alteration, is subcloned into pDN1528 as a PstI-EcoRI fragment and transformed into a protease- and amylase-depleted Bacillus subtilis strain in order to express the variant enzyme.
- the Termamyl variant V54W was constructed by the use of the following mutagenesis primer (written 5' to 3', left to right) :
- the Termamyl variant A52W + V54W was constructed by the use of the following mutagenesis primer (written 5' to 3', left to right) :
- Primer #6616 (written 5' to 3', left to right; P denotes a 5' phosphate) :
- Substrates for saccharification were prepared by dissolving 230 g DE 10 spray-dried maltodextrin, prepared from common corn starch, in 460 ml boiling deionized water and adjusting the dry substance (DS) content to approximately 30% w/w. The pH was adjusted to 4.7 (measured at 60°C) and aliquots of substrate corresponding to 15 g dry weight were transferred to 50 ml blue cap glass flasks.
- the flasks were then placed in a shaking water bath equilibrated at 60°C, and the enzymes added. The pH was readjusted to 4.7 where necessary.
- Glucoamylase AMGTM (Novo Nordisk A/S); dosage 0.18 AG/g DS
- Pullulanase PromozymeTM (Novo Nordisk A/S);
- ⁇ -Amylases TermamylTM (Novo Nordisk A/S); dosage 60 NU/g DS
- Termamyl variant V54W dosage 60 NU/g DS
- Termamyl variant V54W + A52W; dosage 60 NU/g DS 2 ml samples were taken periodically. The pH of each sample was adjusted to about 3.0, and the sample was then heated in a boiling water bath for 15 minutes to inactivate the enzymes. After cooling, the samples were treated with approximately 0.1 g mixed-bed ion exchange resin (BIO-Rad 501-X (D)) for 30 minutes on a rotary mixer and then filtered. The carbohydrate composition of each sample was determined by HPLC. The following results were obtained after 72 hours [DP n denotes a dextrose (D-glucose) oligomer with n glucose units]:
- Unfolding of amylases by exposure to heat or to denaturants such as guanidine hydrochloride is accompanied by a decrease in fluorescence.
- Loss of calcium ions leads to unfolding, and the affinity of ⁇ -amylases for calcium can be measured by fluorescence measurements before and after incubation of each ⁇ -amylase (e.g. at a concentration of 10 ⁇ g/ml) in a buffer (e.g. 50 mM HEPES, pH 7) with different concentrations of calcium (e.g. in the range of 1 ⁇ M-100 mM) or of EGTA (e.g.
- the measured fluorescence F is composed of contributions form the folded and unfolded forms of the enzyme.
- the following equation can be derived to describe the dependence of F on calcium concentration ([Ca]):
- K diss K diss + [Ca] ) ( ⁇ U - ⁇ U log ( [Ca] ) )
- ⁇ N is the fluorescence of the native (folded) form of the enzyme
- ⁇ N is the linear dependence of ⁇ N on the logarithm of the calcium concentration (as observed experimentally)
- ⁇ U is the fluorescence of the unfolded form
- ⁇ U is the linear dependence of ⁇ U on the logarithm of the calcium concentration
- K diss is the apparent calcium-binding constant for an equilibrium process as follows : In fact, unfolding proceeds extremely slowly and is irreversible.
- the rate of unfolding is a dependent on calcium concentration, and the dependency for a given ⁇ -amylase provides a measure of the Ca-binding affinity of the enzyme.
- a standard set of reaction conditions e.g. 22 hours at 55°C
- K diss K diss for different ⁇ - amylases
- the calcium dissociation curves for ⁇ -amylases in general can be fitted to the equation above, allowing determination of the corresponding values of K diss .
- the following values for K diss were obtained for a parent Termamyl-like ⁇ -amylase having the amino acid sequence shown in SEQ ID No. 1 of WO 95/26397 and for the indicated variant thereof according to the invention :
- the 5' sequence is the first separate part of the sequence written with lower case letters
- the coding sequence is the intermediate part of the sequence, where the signal sequence is written with lower case letters and the sequence encoding the mature ⁇ -amylase is written with upper case letters
- the 3' sequence is the third separate part of the sequence written with lower case letters.
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Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP96900895A EP0808363B1 (en) | 1995-02-03 | 1996-02-05 | A method of designing alpha-amylase mutants with predetermined properties |
JP52318796A JP4047379B2 (en) | 1995-02-03 | 1996-02-05 | Method for designing α-amylase variants having predetermined properties |
AU44834/96A AU4483496A (en) | 1995-02-03 | 1996-02-05 | A method of designing alpha-amylase mutants with predetermined properties |
DE69637940T DE69637940D1 (en) | 1995-02-03 | 1996-02-05 | A METHOD FOR THE DESIGN OF ALPHA AMYLASE MUTANTS WITH SPECIFIC CHARACTERISTICS |
AT96900895T ATE432342T1 (en) | 1995-02-03 | 1996-02-05 | A METHOD FOR DESIGNING ALPHA-AMYLASE MUTANTS WITH PREDETERMINED PROPERTIES |
BRPI9607013-7A BR9607013B1 (en) | 1995-02-03 | 1996-02-05 | process of constructing a variant of an original bacillus alpha-amylase derived from a strain of b. licheniformis, from b. amyloliquefaciens, by b. stearothermophilus or a bacillus sp. alkalophilic. |
CA2211316A CA2211316C (en) | 1995-02-03 | 1996-02-05 | Method of designing alpha-amylase mutants with predetermined properties |
MX9705906A MX9705906A (en) | 1995-02-03 | 1996-02-05 | A method of designing alpha-amylase mutants with predetermined properties. |
US08/600,908 US5989169A (en) | 1995-02-03 | 1996-02-13 | α-amylase mutants |
US09/327,563 US7115409B1 (en) | 1995-02-03 | 1999-06-08 | α-amylase mutants |
US10/926,720 US7163816B2 (en) | 1995-02-03 | 2004-08-26 | Alpha-amylase variants |
US11/064,196 US7378264B2 (en) | 1995-02-03 | 2005-02-22 | α-amylase mutants |
US12/100,506 US7993897B2 (en) | 1995-02-03 | 2008-04-10 | α-amylase mutants |
US13/161,931 US8323946B2 (en) | 1995-02-03 | 2011-06-16 | Alpha-amylase mutants |
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DK0128/95 | 1995-02-03 | ||
DK12895 | 1995-02-03 | ||
DK1192/95 | 1995-10-23 | ||
DK119295 | 1995-10-23 | ||
DK125695 | 1995-11-10 | ||
DK1256/95 | 1995-11-10 |
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US08/600,908 A-371-Of-International US5989169A (en) | 1995-02-03 | 1996-02-13 | α-amylase mutants |
US08/600,908 Continuation US5989169A (en) | 1995-02-03 | 1996-02-13 | α-amylase mutants |
US08/683,838 Continuation-In-Part US6022724A (en) | 1995-02-03 | 1996-07-18 | α-amylase mutants |
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WO1996023874A1 true WO1996023874A1 (en) | 1996-08-08 |
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PCT/DK1996/000057 WO1996023874A1 (en) | 1995-02-03 | 1996-02-05 | A method of designing alpha-amylase mutants with predetermined properties |
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US (3) | US5989169A (en) |
EP (2) | EP0808363B1 (en) |
JP (2) | JP4047379B2 (en) |
KR (2) | KR100511499B1 (en) |
CN (1) | CN100419076C (en) |
AT (1) | ATE432342T1 (en) |
AU (1) | AU4483496A (en) |
BR (1) | BR9607013B1 (en) |
CA (1) | CA2211316C (en) |
DE (1) | DE69637940D1 (en) |
DK (1) | DK2199378T3 (en) |
ES (2) | ES2329528T3 (en) |
MX (1) | MX9705906A (en) |
WO (1) | WO1996023874A1 (en) |
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DE69637940D1 (en) | 2009-07-09 |
KR100511499B1 (en) | 2005-12-21 |
KR20050046778A (en) | 2005-05-18 |
KR19980701901A (en) | 1998-06-25 |
JP4047379B2 (en) | 2008-02-13 |
BR9607013A (en) | 1997-10-28 |
CA2211316A1 (en) | 1996-08-08 |
ES2329528T3 (en) | 2009-11-26 |
EP0808363A1 (en) | 1997-11-26 |
CA2211316C (en) | 2013-10-01 |
MX9705906A (en) | 1997-10-31 |
DK2199378T3 (en) | 2012-10-29 |
EP2199378A1 (en) | 2010-06-23 |
US7163816B2 (en) | 2007-01-16 |
ATE432342T1 (en) | 2009-06-15 |
EP2199378B1 (en) | 2012-08-15 |
US5989169A (en) | 1999-11-23 |
JP4584965B2 (en) | 2010-11-24 |
JP2008017847A (en) | 2008-01-31 |
ES2390901T3 (en) | 2012-11-19 |
AU4483496A (en) | 1996-08-21 |
CN1172501A (en) | 1998-02-04 |
CN100419076C (en) | 2008-09-17 |
EP0808363B1 (en) | 2009-05-27 |
US6022724A (en) | 2000-02-08 |
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US20050019886A1 (en) | 2005-01-27 |
JPH11500003A (en) | 1999-01-06 |
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