Stereoselectivity and Structural Characterization of an Imine Reductase (IRED) from <i>Amycolatopsis orientalis</i>
作者:Godwin A. Aleku、Henry Man、Scott P. France、Friedemann Leipold、Shahed Hussain、Laura Toca-Gonzalez、Rebecca Marchington、Sam Hart、Johan P. Turkenburg、Gideon Grogan、Nicholas J. Turner
DOI:10.1021/acscatal.6b00782
日期:2016.6.3
The imine reductase AoIRED from Amycolatopsis orientalis (Uniprot R4SNK4) catalyzes the NADPH-dependent reduction of a wide range of prochiral imines and iminium ions, predominantly with (S)-selectivity and with ee’s of up to >99%. AoIRED displays up to 100-fold greater catalytic efficiency for 2-methyl-1-pyrroline (2MPN) compared to other IREDs, such as the enzyme from Streptomyces sp. GF3546, which
来自东方扁豆的亚胺还原酶Ao IRED(Uniprot R4SNK4)催化NADPH依赖性的一系列前手性亚胺和亚胺离子的还原,主要具有(S)选择性和ee高达99%以上。敖相对于其他的IRED,例如从酶为2-甲基-1-吡咯啉(2MPN)IRED显示高达100倍以上的催化效率链霉菌属。GF3546也具有(S)选择性,因此,Ao IRED是制备合成的有趣候选物。oIRED表现出不同寻常的催化性能,在结构相似的底物之间观察到立体选择性的转化,并且在1-甲基-3,4-二氢异喹啉的情况下,对于同一底物,取决于纯化后酶的年龄。Ao IRED的结构已在“开放”载脂蛋白中确定-形式,揭示规范的二聚体IRED折叠,其中在参与单体的N-和C-末端结构域之间形成活性位点。与NADPH的共结晶产生了与辅因子复合的“封闭”形式,其中域的相对封闭以及相关的环运动导致活性位点小得多。还可以通过与NADPH和1-甲基-1,2