Structural and functional insights into asymmetric enzymatic dehydration of alkenols
作者:Bettina M Nestl、Christopher Geinitz、Stephanie Popa、Sari Rizek、Robert J Haselbeck、Rosary Stephen、Michael A Noble、Max-Philipp Fischer、Erik C Ralph、Hoi Ting Hau、Henry Man、Muhiadin Omar、Johan P Turkenburg、Stephen van Dien、Stephanie J Culler、Gideon Grogan、Bernhard Hauer
DOI:10.1038/nchembio.2271
日期:2017.3
elongated aromatic and aliphatic tertiary alcohols (C5–C15) that contain a specific signature motif demonstrate the broad substrate specificity of LinD. The three-dimensional structure of LinD from Castellaniella defragrans revealed a pentamer with active sites at the protomer interfaces. Furthermore, the structure of LinD in complex with the product geraniol provides initial mechanistic insights into
醇的不对称脱水是直接合成烯烃的重要过程。我们报告的结构和底物特异性的双功能芳樟醇脱水酶异构酶(LinD)从自然界中催化β-月桂烯水合到芳樟醇和随后的异构化成香叶醇的Castellaniella defragrans细菌。包含特定特征基序的截短和延长的芳香族和脂肪族叔醇(C5-C15)的酶促动力学拆分证明了LinD具有广泛的底物特异性。林德从三维结构Castellaniella defragrans揭示了一个五聚体,在前体界面处具有活性位点。此外,LinD与香叶醇产物复合的结构为这种双功能酶提供了初步的力学见解。定点诱变证实了其脱水和异构化活性必不可少的活性位点氨基酸残基。这些结构和机理的见解促进了水合催化剂的开发,丰富了用于新型键形成生物催化的工具箱。