Competence of Thiamin Diphosphate-Dependent Enzymes with 2′-Methoxythiamin Diphosphate Derived from Bacimethrin, a Naturally Occurring Thiamin Anti-vitamin
作者:Natalia S. Nemeria、Brateen Shome、Alicia A. DeColli、Kathryn Heflin、Tadhg P. Begley、Caren Freel Meyers、Frank Jordan
DOI:10.1021/acs.biochem.5b01300
日期:2016.2.23
yeast growth, as well as in inhibition of thiamin biosynthesis. Given that thiamin biosynthetic enzymes could convert bacimethrin to 2′-methoxythiamin diphosphate (MeOThDP), it is important to evaluate the effect of this coenzyme analogue on thiamin diphosphate (ThDP)-dependent enzymes. The potential functions of MeOThDP were explored on five ThDP-dependent enzymes: the human and Escherichia coli pyruvate
Bacimethrin(4-氨基-5-羟甲基-2-甲氧基嘧啶)是一种从某些细菌中分离出来的天然产物,被认为是细菌和酵母生长的抑制剂,以及硫胺素生物合成的抑制作用。鉴于硫胺素生物合成酶可以将杆菌肽转化为 2'-甲氧基硫胺素二磷酸 (MeOThDP),因此评估这种辅酶类似物对硫胺素二磷酸 (ThDP) 依赖性酶的影响非常重要。 MeOThDP 对五种 ThDP 依赖性酶的潜在功能进行了探索:人和大肠杆菌丙酮酸脱氢酶复合物(分别为 PDHc-h 和 PDHc-ec)、大肠杆菌1-脱氧-d-木酮糖 5-磷酸合酶( DXPS),以及人和大肠杆菌2-酮戊二酸脱氢酶复合物(分别为 OGDHc-h 和 OGDHc-ec)。使用多种机械工具(荧光、圆二色性、动力学和质谱)证明 MeOThDP 结合在 ThDP 依赖性酶的活性中心,但结合模式与 ThDP 不同。虽然将 MeOThDP 添加到大肠杆菌PDHc (6–11%)