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- W2159550470 abstract "Nattokinase (subtilisin NAT, NK) is a relatively effective microbial fibrinolytic enzyme that has been identified and characterized from Bacillus natto. In the current report, DNA family shuffling was used to improve the fibrinolytic activity of nattokinase. Three homologous genes from B. natto AS 1.107, Bacillus amyloliquefaciens CICC 20164 and Bacillus licheniformis CICC 10092 were shuffled to generate a mutant library. A plate-based method was used to screen the mutant libraries for improved activity. After three rounds of DNA shuffling, one desirable mutant with 16 amino acid substitutions was obtained. The mutant enzyme was purified and characterized. The kinetic measurements showed that the catalytic efficiency of the mutant NK was approximately 2.3 times higher than that of the wild-type nattokinase. In addition, the molecular modeling analysis suggested that the mutations affect the enzymatic function by changing the surface conformation of the substrate-binding pocket. The current study shows that the evolution of nattokinase with improved fibrinolytic activity by DNA family shuffling is feasible and provides useful references to facilitate the application of nattokinase in thrombolytic therapy." @default.
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- W2159550470 date "2011-10-10" @default.
- W2159550470 modified "2023-09-27" @default.
- W2159550470 title "Directed evolution improves the fibrinolytic activity of nattokinase from Bacillus natto" @default.
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- W2159550470 doi "https://doi.org/10.1111/j.1574-6968.2011.02423.x" @default.
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