Stereodivergent evolution of KpADH for the asymmetric reduction of diaryl ketones with para-substituents
作者:Jiacheng Zhang、Jieyu Zhou、Guochao Xu、Ye Ni
DOI:10.1016/j.mcat.2022.112315
日期:2022.5
KpADH is a promising biocatalyst for the synthesis of chiral bulky-bulky alcohols. Substrate specificity toward diaryl ketone substrates with different substituents at phenyl group was investigated. The results reveal that the para-position of diaryl ketones plays important role in manipulating the stereoselectivity of KpADH. Two vital residues, E214 and T215, were identified through single-point mutagenesis
Kp ADH 是一种很有前途的生物催化剂,可用于合成手性大体积醇。研究了对在苯基处具有不同取代基的二芳基酮底物的底物特异性。结果表明,二芳基酮的对位在控制Kp ADH的立体选择性中起重要作用。通过单点诱变鉴定了两个重要的残基 E214 和 T215,并进行了饱和诱变以评估它们对立体选择性的贡献。此外,Kp ADH 的立体发散进化是通过组合诱变实现的。其中,E214I/T215S/S237A(ISA)和F161V/S196G/E214G(VGG)的ee值>99%(S) 和 99% ( R ) 对 [4-(三氟甲基)苯基]-2-吡啶基甲酮 ( 5a ), ee值 >99% ( S ) 和 98% ( R ) 对 (4-甲基苯基)-2-吡啶基甲酮(6a),分别。动力学表征和相互作用分析进一步证明,消除的侧链碰撞和增强的静电相互作用是提高催化效率和立体选择性的主要原因。该研究提供了对具有对位取代基