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- W2059014940 abstract "A double mutant of Escherichia coli acetyl esterase (EcAE) with enhanced enzymatic activity was obtained by random mutagenesis using error-prone PCR and screening for enzymatic activity by observing halo formation on a tributyrin plate. The mutant contained Leu97Phe (L97F) and Leu209Phe (L209F) mutations. Single mutants L97F and L209F were also constructed and analyzed for kinetic parameters, as well as double mutant L97F/L209F. Kinetic analysis using p-nitrophenyl butyrate as substrate indicated that the k cat values of L97F and L97F/L209F were larger than that of the wild-type enzyme, by 8.3-fold and 12-fold respectively, whereas no significant change was observed in the k cat value of L209F. The K m values of L209F and L97F/L209F were smaller than that of the wild-type enzyme, by 2.9-fold and 2.4-fold respectively, whereas no significant change was observed in the K m value of L97F. These results indicate that a combination of an increase in k cat values due to the L97F mutation and a decrease in K m value due to the L209F mutation renders the k cat/K m value of the double mutant enzyme 29-fold higher than that of the wild-type enzyme." @default.
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- W2059014940 date "2012-11-23" @default.
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- W2059014940 title "Enhancement of the Enzymatic Activity ofEscherichia coliAcetyl Esterase by a Double Mutation Obtained by Random Mutagenesis" @default.
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- W2059014940 doi "https://doi.org/10.1271/bbb.120430" @default.
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