Delineating Substrate Diversity of Disparate Short-Chain Dehydrogenase Reductase from Debaryomyces hansenii
作者:Arindam Ghatak、Nagakumar Bharatham、Anirudh P. Shanbhag、Santanu Datta、Janani Venkatraman
DOI:10.1371/journal.pone.0170202
日期:——
been utilized for catalyzing the reduction of many aromatic/aliphatic prochiral ketones to their respective alcohols. However, there is a paucity of data that elucidates their innate biological role and diverse substrate space. In this study, we executed an in-depth biochemical characterization and substrate space mapping (with 278 prochiral ketones) of an unannotated SDR (DHK) from Debaryomyces hansenii
短链脱氢酶还原酶(SDR)已用于催化将许多芳香族/脂肪族前手性酮还原为它们各自的醇。但是,很少有数据阐明其先天生物学作用和多样的底物空间。在这项研究中,我们对汉森Debaryomyces hansenii的无注释SDR(DHK)进行了深入的生化特性分析和底物空间定位(含278个手性酮),并将其与结构和功能上具有特征的SDR伸长Synechococcus elongatus进行了比较。PCC 7942 FabG来描述其工业意义。观察到,尽管HKH的转化率更高,但DHK却比FabG效率更高,可以减少各种酮。FabG结构与DHK的同源性模型以及底物与两种结构的对接的比较表明,在DHK的底物结合位点附近存在其他柔性环。使用差示扫描荧光法通过实验证实了FabG和DHK的辅因子和底物结合位点的比较弹性。据推测,尽管保留了催化三单元组的位置,但环的柔韧性可能是DHK优异的催化效率的原因。