Abstract
By mutating Ala-289 by Phe or Tyr in the Bacillus stearothermophilus alpha-amylase, we induced this enzyme to perform alcoholytic reactions, a function not present in the wild-type enzyme. This residue was selected from homology analysis with neopullulanase, where the residue has been implicated in the control of transglycosylation [Kuriki et al. (1996) J. Biol. Chem. 271, 17321-173291. We made some inferences about the importance of electrostatic and geometrical modifications in the active site environment of the amylase to explain the behavior of the modified enzyme.
Publication types
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Comparative Study
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Research Support, Non-U.S. Gov't
MeSH terms
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Amino Acid Sequence
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Amino Acid Substitution*
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Catalytic Domain
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Geobacillus stearothermophilus / enzymology*
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Glycoside Hydrolases / metabolism
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Glycosylation
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Glycosyltransferases / genetics
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Glycosyltransferases / metabolism*
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Hydrogen-Ion Concentration
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Hydrolysis
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Models, Molecular
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Molecular Sequence Data
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Mutagenesis, Site-Directed
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Sequence Alignment
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Sequence Analysis
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alpha-Amylases / genetics
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alpha-Amylases / metabolism*
Substances
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Glycosyltransferases
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Glycoside Hydrolases
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alpha-Amylases
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neopullulanase