Influence of Substrate Binding Residues on the Substrate Scope and Regioselectivity of a Plant
<i>O</i>
‐Methyltransferase against Flavonoids
作者:Qingyun Tang、Yoanes M. Vianney、Klaus Weisz、Christoph W. Grathwol、Andreas Link、Uwe T. Bornscheuer、Ioannis V. Pavlidis
DOI:10.1002/cctc.202000471
日期:2020.7.21
important modification for flavonoids. It not only greatly increases absorption and oral bioavailability of flavonoids, but also brings new biological activities. Flavonoid methylation is usually achieved by a specific group of plant O‐methyltransferases (OMTs) which typically exhibit high substrate specificity. Here we investigated the effect of several residues in the binding pocket of the Clarkia breweri
游离羟基的甲基化是类黄酮的重要修饰。它不仅大大增加了类黄酮的吸收和口服生物利用度,而且带来了新的生物活性。类黄酮甲基化通常通过一组特定的植物O-甲基转移酶(OMT)实现,它们通常表现出很高的底物特异性。在这里,我们研究了Clarkia Breweri结合袋中几种残基的作用异丁香酚OMT对底物的作用范围和对类黄酮的区域选择性。如我们先前的出版物中所述,鉴定出的突变T133M增强了该酶对几种黄酮类化合物的活性,其中黄酮雌二醇,柚皮苷,木犀草素,槲皮素乃至异黄酮类染料木黄酮,而第322和326位氨基酸的减少影响了这两种酶,甲基转移酶的活性和区域选择性。在这项工作的基础上,以高纯度生产出了自然界中罕见的甲基化类黄酮。