Oxidative Dearomatization of PLP in Thiamin Pyrimidine Biosynthesis in <i>Candida albicans</i>
作者:Anushree Mondal、Rung-Yi Lai、Dmytro Fedoseyenko、Nitai Giri、Tadhg P. Begley
DOI:10.1021/jacs.2c08560
日期:2023.3.1
The yeast thiamin pyrimidine synthase THI5p catalyzes one of the most complex organic rearrangements found in primary metabolism. In this reaction, the active site His66 and PLP are converted to thiamin pyrimidine in the presence of Fe(II) and oxygen. The enzyme is a single-turnover enzyme. Here, we report the identification of an oxidatively dearomatized PLP intermediate. We utilize oxygen labeling
酵母硫胺嘧啶合酶 THI5p 催化初级代谢中发现的最复杂的有机重排之一。在此反应中,活性位点 His66 和 PLP 在 Fe(II) 和氧气存在下转化为硫胺嘧啶。该酶是单周转酶。在这里,我们报告了氧化脱芳构化 PLP 中间体的鉴定。我们利用氧标记研究、基于化学救援的部分重构实验和化学模型研究来支持这一鉴定。此外,我们还鉴定并表征了源自氧化脱芳构化 PLP 的三种分流产物。