Directed evolution of Aspergillus oryzae lipase for the efficient resolution of (R,S)-ethyl-2-(4-hydroxyphenoxy) propanoate
2020
Zhang, Mengjie | Li, Qi | Lan, Xing | Li, Xiaojun | Zhang, Yinjun | Wang, Zhao | Zheng, Jianyong
Aspergillus oryzae lipase (AOL) is a potential biocatalyst for industrial application. In this study, a mutant lipase AOL-3F³⁸ᴺ/ⱽ²³⁰ᴿ was screened through two rounds of directed evolution, resulting in a fourfold increase in lipase activity, and threefold in catalytic efficiency (kcₐₜ/Kₘ), while maintaining its excellent stereoselectivity. AOL-3F³⁸ᴺ/ⱽ²³⁰ᴿ enzyme activity was maximum at pH 7.5 and also at 40 °C. And compared with wild-type AOL-3, AOL-3F³⁸ᴺ/ⱽ²³⁰ᴿ preferentially hydrolyzed the fatty acid ethyl ester carbon chain length from C4 to C6–C10. In the same catalytic reaction conditions, the conversion of (R,S)-ethyl-2-(4-hydroxyphenoxy) propanoate ((R,S)-EHPP) by AOL-3F³⁸ᴺ/ⱽ²³⁰ᴿ can be increased 169.7% compared to the original enzyme. The e.e.ₛ of (R,S)-EHPP achieved 99.4% and conversion about 50.2% with E value being 829.0. Therefore, AOL-3F³⁸ᴺ/ⱽ²³⁰ᴿ was a potential biocatalyst for obtaining key chiral compounds for aryloxyphenoxy propionate (APP) herbicides.
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