A Novel esterase from Pseudochrobactrum asaccharolyticum WZZ003: Enzymatic properties toward model substrate and catalytic performance in chiral fungicide intermediate synthesis
作者:Feng Cheng、Feifei Cheng、Jianyong Zheng、Guanzhong Wu、Yinjun Zhang、Zhao Wang
DOI:10.1016/j.procbio.2018.03.011
日期:2018.6
biocatalyst, several esterase genes were cloned from Pseudochrobactrum asaccharolyticum WZZ003. The esterase PAE07, among eight enzymes, was selected because it exhibited the highest hydrolysis activity toward (R,S)-DMPM. The DNA and amino acid sequence analysis suggested that PAE07 is a new member of lipolytic enzyme family V. The enzymatic properties of PAE07 toward (R,S)-DMPM and model substrate (p-nitrophenyl
摘要 只有少数酯酶可用于合成光学纯杀菌剂。例如,使用涉及酯酶的生物反应合成的 (R)-甲霜灵显示出杀真菌活性,而 (S)-对映异构体是多余的。然而,(R)-甲霜灵的生物合成目前受到酯酶较低活性、选择性和热稳定性的阻碍。因此,为了获得更好的生物催化剂,从 Pseudochrobactrum asaccharolyticum WZZ003 中克隆了几个酯酶基因。在八种酶中选择酯酶 PAE07 是因为它对 (R,S)-DMPM 表现出最高的水解活性。DNA 和氨基酸序列分析表明 PAE07 是脂解酶家族 V 的新成员。研究了 PAE07 对 (R,S)-DMPM 和模型底物(对硝基苯乙酸酯)的酶学性质。PAE07 被发现是一种高活性的酯酶,具有优异的对映选择性。优化了温度和pH值等反应条件,并研究了金属离子、有机溶剂和去垢剂的影响。结果表明,PAE07 是 (R)-甲霜灵制造的竞争候选者。