The present invention relates to novel alpha-amylase mutant species derived from the DNA sequence of natural or recombinant alpha-amylases. Generally, mutant alpha-amylases are obtained by in vitro modifying a precursor DNA sequence encoding a natural or presynthetic alpha-amylase to produce a substitution (replacement) or deletion of one or more oxidizable amino acid residues in the amino acid sequence of the precursor alpha-amylase. Lose. Such mutant alpha-amylases have improved oxidative stability and / or improved pH performance profile and / or improved thermal stability when compared to precursors. The invention also relates to methods of using mutant amylases as well as to detergents and starch compositions composed of mutant amylases.
展开▼
