Enhancing the Catalytic Performance of a CYP116B Monooxygenase by Transdomain Combination Mutagenesis
作者:Ren-Jie Li、Jian-He Xu、Qi Chen、Jing Zhao、Ai-Tao Li、Hui-Lei Yu
DOI:10.1002/cctc.201800054
日期:2018.7.19
multi‐domain P450 enzyme with redox partners fused to the heme domain. After focused mutagenesis on the heme domain, a triple mutant H3 (N119C/V264A/V437G) was hit, that improved the turnover frequency (TOF) and CE of P450LaMO by about 7.8‐fold and 3.0‐fold, respectively. A redox domain‐based mutant with higher cytochrome c reduction activity, MR1 (M612L/K774Y), mediated more efficient electron transfer, elevated
集合体Labrenzia aaggregata(P450 La MO)中发现的细胞色素P450单加氧酶是具有多种充氧功能的自给自足的氧化还原系统。但是,其反应速度低,电子耦合效率(CE)差和热稳定性差,严重阻碍了其催化性能。在此,提出了一种简单的跨域组合突变策略,用于将这种多域P450酶与与血红素域融合的氧化还原伴侣进行工程改造。在针对血红素结构域进行集中诱变后,命中了一个三重突变体H3(N119C / V264A / V437G),这使P450 La MO的周转频率(TOF)和CE分别提高了约7.8倍和3.0倍。具有较高细胞色素c的基于氧化还原域的突变体还原活性MR1(M612L / K774Y)介导的电子转移效率更高,TOF升高了4.9倍,耦合效率提高了4.2倍。通过组合来自不同域的突变位点,进一步增强了有益效果,从而产生了组合突变体(N119C / V264A / V437G / M612L