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  • Title: Repeated Random Mutagenesis of alpha-Amylase from Bacillus licheniformis for Improved pH Performance.
    Author: Priyadharshini R, Manoharan S, Hemalatha D, Gunasekaran P.
    Journal: J Microbiol Biotechnol; 2010 Dec; 20(12):1696-701. PubMed ID: 21193826.
    Abstract:
    The alpha-amylases activity was improved by random mutagenesis and screening. A region comprising residues from the position 34-281 was randomly mutated in B. licheniformis alpha-amylase (AmyL), and the library with mutations ranging from low, medium, and high frequencies was generated. The library was screened using an effective liquid-phase screening method to isolate mutants with an altered pH profile. The sequencing of improved variants indicated 2-5 amino acid changes. Among them, mutant TP8H5 showed an altered pH profile as compared with that of wild type. The sequencing of variant TP8H5 indicated 2 amino acid changes, Ile157Ser and Trp193Arg, which were located in the solvent accessible flexible loop region in domain B.
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