A Promiscuous De Novo Retro-Aldolase Catalyzes Asymmetric Michael Additions via Schiff Base Intermediates
作者:Xavier Garrabou、Tobias Beck、Donald Hilvert
DOI:10.1002/anie.201500217
日期:2015.5.4
enzymes for a range of mechanistically distinct reactions. Here we show that the rudimentary active sites of these catalysts can give rise to useful chemical promiscuity. Specifically, RA95.5‐8, designed and evolved as a retro‐aldolase, also promotes asymmetric Michael additions of carbanions to unsaturated ketones with high rates and selectivities. The reactions proceed by amine catalysis, as indicated by
计算设计的最新进展已使原始酶能够开发出一系列在机械上截然不同的反应。在这里,我们表明这些催化剂的基本活性位可以引起有用的化学混杂。特别是,RA95.5-8是作为逆醛缩酶设计和发展的,它还以较高的速率和选择性促进了碳原子向不饱和酮上的不对称迈克尔加成反应。如诱变和X射线数据所示,反应通过胺催化进行。该催化剂固有的柔韧性和可调性应使其成为通过定向进化进一步优化和/或机械多样化的通用平台。