Highly regio- and enantio-selective hydrolysis of two racemic epoxides by GmEH3, a novel epoxide hydrolase from Glycine max
作者:Chen Zhang、Chuang Li、Xiu-xiu Zhu、You-yi Liu、Jun Zhao、Min-chen Wu
DOI:10.1016/j.ijbiomac.2020.08.011
日期:2020.12
50 mM−1 s−1) of purified GmEH3 for (S)-5a was slightly higher than that (kcatR/KmR = 1.52 mM−1 s−1) for (R)-5a, whereas the kcat/Km (5.16 mM−1 s−1) for (S)-7a was much higher than that (0.09 mM−1 s−1) for (R)-7a. Using 200 mg/mL wet cells of E. coli/gmeh3 as the biocatalyst, the scale-up enantioconvergent hydrolysis of 150 mM rac-5a at 25 °C for 1.5 h afforded (R)-5b with 90.2% eep and 95.4% yieldp
基于计算机辅助分析,从大豆中挖掘出一种新型环氧化物水解酶,命名为Gm EH3。然后,克隆了Gm EH3编码基因gmeh3 ,并在大肠杆菌Rosetta(DE3)中成功表达。在所研究的十种外消旋环氧化物中, Gm EH3 在外消旋间氯苯乙烯氧化物 ( 5a ) 的不对称水解中具有最高和最好的互补区域选择性(区域选择性系数, α S = 93.7% 和 β R = 97.2%),并且对外消旋苯基缩水甘油醚 ( 7a ) 具有最高的对映选择性(对映体比率, E = 55.6)。纯化的Gm EH3 对 ( S )- 5a的催化效率 ( k cat S / K m S = 2.50 mM -1 s -1 ) 略高于 ( k cat R / K m R = 1.52 mM -1 s - ) 1 ) ( R )- 5a ,而 ( S )- 7a的k cat / K m (5.16 mM −1 s −1 )