Transforming a Stable Amide into a Highly Reactive One: Capturing the Essence of Enzymatic Catalysis
作者:Bruno S. Souza、Jose R. Mora、Eduardo H. Wanderlind、Rosilene M. Clementin、Jose C. Gesser、Haidi D. Fiedler、Faruk Nome、Fredric M. Menger
DOI:10.1002/anie.201701306
日期:2017.5.2
proteinase, function with two aspartate carboxy groups at the active site. This relationship has been modeled in a system possessing an otherwise unactivated amide positioned between two carboxy groups. The model amide is cleaved at an enzyme‐like rate that renders the amide nonisolable at 35 °C and pH 4 owing to the joint presence of carboxy and carboxylate groups. A currently advanced theory attributing
天冬氨酸蛋白酶(包括HIV-1蛋白酶)在活性位点具有两个天冬氨酸羧基。已经在具有位于两个羧基之间的否则未活化的酰胺的系统中对这种关系进行了建模。模型酰胺以类似于酶的速率裂解,由于羧基和羧酸根基团的共同存在,使得酰胺在35°C和pH 4下不可分离。当存在合适的原子间相互作用时,将酶的几乎全部催化能力归因于静电重组的当前先进理论被证明是多余的。我们的动力学结果与时空概念一致,即将酰胺基团以适当的几何形状嵌入两个羧基部分之间,且距离小于水的直径,从而导致类酶速率增加。