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- W1970241958 abstract "The xylanase A gene from Streptomyces lividans was modified by site-directed mutagenesis, selecting for mutations that improved the catalytic activity and thermostability of the enzyme. Mutant notation uses the one-letter abbreviation for amino acids. The first and the last letters represent, respectively, the residue to be changed and the replacing residue. The number indicates the position of the substitution. The mutant enzymes F155Y, R156E, R156K, and N173D were respectively 28, 10, 50, and 25% more active than the wild-type enzyme. In addition, the half-lives at 60°C of the R156E and N173D xylanases were respectively 6 and 40 min longer than that of the wild-type enzyme even in the absence of substrate. The favorable single mutations were combined to generate the double mutants E156/173D and K156/173D, which were 22 and 47% less active than the wild type. However, the activity half-life of the E156/173D enzyme at 60°C was twice that of the xylanase A. The pH-activity profiles of all the mutant xylanases were similar to that of the wild-type enzyme." @default.
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- W1970241958 date "1994-05-01" @default.
- W1970241958 modified "2023-10-16" @default.
- W1970241958 title "Increase in catalytic activity and thermostability of the xylanase A of Streptomyces lividans 1326 by site-specific mutagenesis" @default.
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- W1970241958 doi "https://doi.org/10.1016/0141-0229(94)90158-9" @default.
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