Screening and Engineering the Synthetic Potential of Carboxylating Reductases from Central Metabolism and Polyketide Biosynthesis
作者:Dominik M. Peter、Lennart Schada von Borzyskowski、Patrick Kiefer、Philipp Christen、Julia A. Vorholt、Tobias J. Erb
DOI:10.1002/anie.201505282
日期:2015.11.2
Carboxylating enoyl‐thioester reductases (ECRs) are a recently discovered class of enzymes. They catalyze the highly efficient addition of CO2 to the double bond of α,β‐unsaturated CoA‐thioesters and serve two biological functions. In primary metabolism of many bacteria they produce ethylmalonyl‐CoA during assimilation of the central metabolite acetyl‐CoA. In secondary metabolism they provide distinct
羧化烯酰硫酯还原酶(ECR)是最近发现的一类酶。它们催化高效添加CO 2与α,β-不饱和CoA-硫酯的双键结合,具有两个生物学功能。在许多细菌的初级代谢中,它们在吸收中央代谢物乙酰辅酶A的过程中会产生乙基丙二酰辅酶A。在次级代谢中,它们提供独特的α-羧基-酰基-硫代酯,以改变许多聚酮化合物天然产物的主链。使用各种可能的底物库系统评估了不同的ECR。我们鉴定了三个活性位点残基,以区分仅限于C4和C5-烯酰基-CoA的ECR和高度混杂的ECR,并成功地设计了一种选定的ECR作为原理证明。这项研究定义了ECR反应性的分子基础,从而可以预测和操纵天然产物多样化中的关键反应。