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• W2888371121 abstract "Penicillin acylase is commonly used to produce the medical intermediates of 6-Aminopenicillanic acid (6-APA) and 7-Aminodesacetoxycephalosporanic acid (7-ADCA) in industrial process. Nowadays, Penicillin G acylase (PGA) has been widely applied for making pharmaceutical intermediates, while penicillin V acylase (PVA) has been less used for that due to its low activity and poor conversion. In this study, a PVA from Bacillus sphaericus (BspPVA) was employed for directed evolution study with hoping to increase its catalytic efficiency. Finally, a triple mutant BspPVA-3 (T63S/N198Y/S110C) was obtained with 12.4-fold specific activity and 11.3-fold catalytic efficiency higher than BspPVA-wt (wild type of BspPVA). Moreover, the conversion yields of 6-APA catalyzed by BspPVA-3 reached 98% with 20% (w/v) penicillin V as substrate, which was significantly higher than that of the BspPVA-wt (85%). Based on the analysis of modeling, the enhancement of specific activity of mutant BspPVA-3 was probably attributed to the changes in the number of hydrogen bonds within the molecules. The triple mutant PVA developed in this study has a potential for large-scale industrial application for 6-APA production." @default.
• W2888371121 created "2018-08-31" @default.
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• W2888371121 date "2018-12-01" @default.
• W2888371121 modified "2023-10-07" @default.
• W2888371121 title "Directed evolution of a penicillin V acylase from Bacillus sphaericus to improve its catalytic efficiency for 6-APA production" @default.
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• W2888371121 doi "https://doi.org/10.1016/j.enzmictec.2018.08.006" @default.
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