Enantioselective hydrolysis of various substituted styrene oxides with Aspergillus Niger CGMCC 0496Electronic supplementary information (ESI) available: experimental details. See http://www.rsc.org/suppdata/ob/b3/b312469j/
作者:Hao Jin、Zu-yi Li、Xiao-Wei Dong
DOI:10.1039/b312469j
日期:——
Enantioselective biohydrolysis of various substituted styrene oxides using whole fungus cells of Aspergillus nigerCGMCC 0496 are described. The results show not only para- but also some ortho- substituted styrene oxides can achieve high enantioselectivity during the hydrolysis.
Structure-Guided Regulation in the Enantioselectivity of an Epoxide Hydrolase to Produce Enantiomeric Monosubstituted Epoxides and Vicinal Diols via Kinetic Resolution
Structure-guided microtuning of an Aspergillus usamii epoxide hydrolase was executed. One mutant, A214C/A250I, displayed a 12.6-fold enhanced enantiomeric ratio (E = 202) toward rac-styrene oxide, achieving its nearly perfect kinetic resolution at 0.8 M in pure water or 1.6 M in n-hexanol/water. Several other beneficial mutants also displayed significantly improved E values, offering promising biocatalysts
对Aspergillus usamii环氧水解酶进行了结构引导的微调。一种突变体 A214C/A250I对消旋-氧化苯乙烯的对映体比 ( E = 202)提高了 12.6 倍,在纯水中 0.8 M 或正己醇/水中 1.6 M 时实现了近乎完美的动力学分辨率。其他一些有益的突变体也显示出显着提高的E值,为获得 19 种结构多样的手性单取代环氧化物(97.1 – ≥ 99% ee s)和邻二醇(56.2–98.0% ee p)提供了有希望的生物催化剂,并且产率很高。
Enantioselective Hydrolysis of<i>o</i>-Nitrostyrene Oxide by Whole Cells of<i>Aspergillus niger</i>CGMCC 0496
作者:Hao JIN、Zu-yi LI
DOI:10.1271/bbb.66.1123
日期:2002.1
The asymmetric biohydrolysis is described of o-nitrostyrene oxide with high selectivity by whole cells of Aspergillus niger CGMCC 0496. Both the epoxide and diol could be obtained in a high state of optical purity (over 98%). Product inhibition was found when using a high ratio of substrate to cells.
Stereoselective Hydrolysis of Epoxides by re<i>Vr</i>EH3, a Novel <i>Vigna radiata</i> Epoxide Hydrolase with High Enantioselectivity or High and Complementary Regioselectivity
for the stereoselective hydrolysis of epoxides, an epoxide hydrolase (VrEH3) gene from Vigna radiata was cloned and expressed in Escherichia coli. Recombinant VrEH3 displayed the maximum activity at pH 7.0 and 45 °C and high stability at pH 4.5–7.5 and 55 °C. Notably, reVrEH3 exhibited high and complementary regioselectivity toward styrene oxides 1a–3a and high enantioselectivity (E = 48.7) toward o-cresyl