Oxidativley stable alpha-amylase
First Claim
1. DNA encoding a mutant alpha-amylase, the mutant alpha-amylase derived from Bacillus and comprising:
- (a) a substitution of an amino acid selected from the group consisting of threonine, leucine, alanine, arginine, asparagine, aspartic acid, glutamic acid, glycine, isoleucine, lysine, phenylalanine, proline, serine, valine, histidine and glutamine or a deletion of a methionine residue at a position equivalent to M197 in Bacillus licheniformis alpha-amylase; and
/or(b) a substitution of an amino acid selected from the group consisting of leucine, threonine, asparagine, aspartate, serine, valine, and isoleucine for a methionine residue at a position equivalent to M15 in Bacillus licheniformis alpha amylase.
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Abstract
Novel alpha-amylase mutants derived from the DNA sequences of naturally occurring or recombinant alpha-amylases are disclosed. The mutant alpha-amylases, in general, are obtained by in vitro modifications of a precursor DNA sequence encoding the naturally occurring or recombinant alpha-amylase to generate the substitution (replacement) or deletion of one or more oxidizable amino acid residues in the amino acid sequence of a precursor alpha-amylase. Such mutant alpha-amylases have altered oxidative stability and/or altered pH performance profiles and/or altered thermal stability as compared to the precursor. Also disclosed are detergent and starch liquefaction compositions comprising the mutant amylases, as well as methods of using the mutant amylases.
91 Citations
11 Claims
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1. DNA encoding a mutant alpha-amylase, the mutant alpha-amylase derived from Bacillus and comprising:
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(a) a substitution of an amino acid selected from the group consisting of threonine, leucine, alanine, arginine, asparagine, aspartic acid, glutamic acid, glycine, isoleucine, lysine, phenylalanine, proline, serine, valine, histidine and glutamine or a deletion of a methionine residue at a position equivalent to M197 in Bacillus licheniformis alpha-amylase; and
/or(b) a substitution of an amino acid selected from the group consisting of leucine, threonine, asparagine, aspartate, serine, valine, and isoleucine for a methionine residue at a position equivalent to M15 in Bacillus licheniformis alpha amylase. - View Dependent Claims (2, 3, 4, 5)
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- 6. DNA encoding an alpha amylase comprising an amino acid sequence corresponding to Seq. ID No. 37.
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9. DNA encoding a mutant alpha amylase, wherein said alpha-amylase has an amino acid sequence of SEQ ID NO:
- 37 with a deletion or substitution of amino acid residue M15, M197 and/or W138.
- View Dependent Claims (10, 11)
Specification