Diels-Alder環加成酶PyrI4催化機制的計算化學研究
作者:
小柯機器人發布時間:2020/11/17 13:00:39
該團隊研究了由單功能D-A酶PyrI4催化的分子內Diels–Alder反應的活化和立體選擇性機理,天然產物吡咯菌素家族的生物合成中關鍵的螺環-四環骨架的形成即由該酶催化。PyrI4的關鍵活化效應主要來自酸催化、構象誘導適應機制以及與之配合的PyrI4的獨特「加蓋」特徵以穩定D-A反應過渡態。
研究表明,PyrI4酶增強了底物內在的Diels-Alder立體選擇性,導致產物的立體選擇性合成。
附:英文原文
Title: Computational Investigation of the Mechanism of Diels–Alderase PyrI4
Author: Yike Zou, Song Yang, Jacob N. Sanders, Wei Li, Peiyuan Yu, Hongbo Wang, Zhijun Tang, Wen Liu, K. N. Houk
Issue&Volume: November 14, 2020
Abstract: We studied the mechanisms of activation and stereoselectivity of a monofunctional Diels–Alderase (PyrI4)-catalyzed intramolecular Diels–Alder reaction that leads to formation of the key spiro-tetramate moiety in the biosynthesis of the pyrroindomycin family of natural products. Key activation effects of PyrI4 include acid catalysis and an induced-fit mechanism that cooperate with the unique 「lid」 feature of PyrI4 to stabilize the Diels–Alder transition state. PyrI4 enhances the intrinsic Diels–Alder stereoselectivity of the substrate and leads to stereospecific formation of the product.
DOI: 10.1021/jacs.0c10813
Source: https://pubs.acs.org/doi/10.1021/jacs.0c10813