Reversible and Efficient Inhibition of UDP-Galactopyranose Mutase by Electrophilic, Constrained and Unsaturated UDP-Galactitol Analogues
作者:Christophe Ansiaux、Inès N'Go、Stéphane P. Vincent
DOI:10.1002/chem.201202302
日期:2012.11.12
A series of UDP‐galactitols were designed as analogues of high‐energy intermediates of the UDP‐galactopyranose mutase (UGM) catalyzed furanose/pyranose interconversion, an essential step of Mycobacterium tuberculosis cell wall biosynthesis. The final compounds structurally share the UDP and the galactitol substructures that were connected by four distinct electrophilic connections (epoxide, lactone
设计了一系列UDP半乳糖类似物作为UDP半乳糖吡喃糖变位酶(UGM)催化呋喃糖/吡喃糖相互转化的高能中间体的类似物,这是结核分枝杆菌的重要步骤细胞壁生物合成。最终的化合物在结构上共有UDP和半乳糖醇亚结构,它们通过四个不同的亲电子连接(环氧化物,内酯和迈克尔受体)相连。所有分子均由常见的过苄基无环半乳糖前体合成,该前体通过烯基化,炔基化和环丙烷化作用衍生化。对UGM的抑制作用研究可以清楚地表明,UDP和半乳糖醇部分的相对方向发生细微变化会导致结合特性发生巨大变化。与已知的抑制剂相比,环氧化物衍生物显示出非常紧密的,可逆的抑制曲线。此外,一项与时间有关的失活研究表明,这些亲电子结构均不能与UGM或其FAD辅因子发生反应,