Molecular and Structural Characterization of a Promiscuous
<i>C</i>
‐Glycosyltransferase from
<i>Trollius chinensis</i>
作者:Jun‐Bin He、Peng Zhao、Zhi‐Min Hu、Shuang Liu、Yi Kuang、Meng Zhang、Bin Li、Cai‐Hong Yun、Xue Qiao、Min Ye
DOI:10.1002/anie.201905505
日期:2019.8.12
TcCGT1, which is initiated by the spontaneous deprotonation of the substrate. The spacious binding pocket explains the substrate promiscuity, and the binding pose of the substrate determines C‐ or O‐glycosylation activity. Site‐directed mutagenesis at two residues (I94E and G284K) switched C‐ to O‐glycosylation. TcCGT1 is the first plant CGT with a crystal structure and the first flavone 8‐C‐glycosyltransferase
在本文中,探索了药用植物金莲花(Trollius chinensis)中新的C-糖基转移酶(CGT)TcCGT1的催化混杂性。TcCGT1可以有效和区域特异性地催化36种黄酮和其他类黄酮的8 C糖基化,还可以催化多种酚的O糖基化。TcCGT1与尿苷二磷酸酯复合的晶体结构以1.85Å的分辨率测定。分子对接揭示了TcCGT1催化机制的新模型,该模型由底物的自发去质子化引发。宽大的装订袋说明了基材的混杂性,并且基材的装订姿势决定了C或O糖基化活性。位点定向诱变在两个残基(I94E和G284K)切换Ç -到Ò -glycosylation。TcCGT1是第一个具有晶体结构的植物CGT,并且是第一个描述的黄酮8- C-糖基转移酶。这为设计有效的糖基化生物催化剂提供了基础。