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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Computational Modeling Study on Formation of Acyclic Clavulanate Intermediates in Inhibition of Class A beta-Lactamase: Water-Assisted Proton Transfer
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Computational Modeling Study on Formation of Acyclic Clavulanate Intermediates in Inhibition of Class A beta-Lactamase: Water-Assisted Proton Transfer

机译:计算模型研究无环棒酸中间体抑制A类β-内酰胺酶:水辅助质子转移的形成

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摘要

Molecular dynamics (MD) simulation and quantum chemical (QC) calculations were used to investigate the reaction mechanism of the formation of acyclic clavulanate intermediates in the inhibition of class A beta-lactamase. The initial model for QC calculations was derived from an MD simulation. It was composed of a substrate clavulanate and four residues (Ser70, Gln237, Ser130, and Ser216), which form hydrogen bonds with the substrate. The QC calculation results indicate that the oxazolidine ring can undergo cleavage by proton transfer, which yields not only imine but also enamine products. A new mechanism involving hydrogen transfer from C6 to O1 has been suggested. Besides, MD simulation provided evidence that the water molecule can catalyze the proton transfer, and QC calculation shows water assistance can decrease the energy barrier greatly.
机译:使用分子动力学(MD)模拟和量子化学(QC)计算来研究无环棒酸中间体形成对抑制A类β-内酰胺酶的反应机理。质控计算的初始模型是从MD模拟中得出的。它由底物克拉维酸盐和四个残基(Ser70,Gln237,Ser130和Ser216)组成,它们与底物形成氢键。 QC计算结果表明,恶唑烷环可通过质子转移发生裂解,不仅产生亚胺,而且产生烯胺产物。已经提出了一种新的机制,涉及从C6到O1的氢转移。此外,MD模拟提供了水分子可以催化质子转移的证据,而QC计算表明水辅助可以大大降低能垒。

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