Science Blog of Dr. Yuan分享 This blog is mainly on Molecular molecular modelling and simulations


QM calculation unravels the stereo selectivity

已有 1563 次阅读 2017-12-14 17:53 |个人分类:科研笔记|系统分类:科研笔记

Structural and Computational Insight into the Catalytic Mechanism of Limonene Epoxide Hydrolase Mutants in Stereoselective Transformations, JACS (2017), DOI: 10.1021/jacs.7b10278

Zhoutong Sun, Lian Wu, Marco Bocola, H.C. Stephen Chan, Richard Lonsdale, Xu-Dong Kong, Shuguang Yuan*, Jiahai Zhou*, and Manfred T. Reetz*

Stereo selectivity is an important topic inenzyme catalysis research as well as in computational structural biology.Recently, we have successfully combined quantum mechanics (QM) with moleculardynamics (MD) simulations to depict the stereo selectivity of limonene epoxidehydrolase (LEH).

When substrates approach LEH, they caninduce large fluctuation in H4, C loop and loop A, which opens space for theentrance of the respective compounds. Subsequently, an activated highlyconserved water molecule, hydrogen-bonded with Y53, N55 and D132, can undergonucleophilic attack in two different ways: reaction either at C1 or at C2 ofthe epoxide moiety . If the distance between water and C1 (d1) is shorter than thatof C2 (d2), LEH favors the formation of the (R,R)-products. This stereoselectivity is supported by the QM-computed lower activation energy.

下一篇:Opportunities and Challenges of a multi-scale cell model


该博文允许注册用户评论 请点击登录 评论 (0 个评论)


Archiver|手机版|科学网 ( 京ICP备07017567号-12 )

GMT+8, 2021-3-2 10:24

Powered by

Copyright © 2007- 中国科学报社