Theoretical Study on the Mechanism of the Acylate Reaction of β-Lactamase.

Theoretical Study on the Mechanism of the Acylate Reaction of β-Lactamase.
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β-内酰胺酶酰化反应机理的理论研究

DOI:
10.1021/acsomega.1c00592
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发表时间:
2021-05-18
期刊:
影响因子:
4.1
通讯作者:
Qin YD
Qin YD
中科院分区:
化学3区
文献类型:
--
作者:
Wei WM;Xu YL;Zheng RH;Zhao T;Fang W;Qin YD

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利用密度泛函理论和团簇方法,研究了β-内酰胺酶与青霉素G酰化反应的反应势能面,计算了反应的吉布斯自由能,其中溶剂效应是重要的,并考虑了溶剂效应.研究了两种反应途径:一种是多步反应,其反应的速率极限能垒为19.1 kcal/mol,相对较小,反应容易发生;另一种是一步反应,其反应的速率极限能垒为45.0 kcal/mol,相对较大,反应难以发生。解释了两条路径具有不同障碍的原因。
Using density functional theory and a cluster approach, we study the reaction potential surface and compute Gibbs free energies for the acylate reaction of β-lactamase with penicillin G, where the solvent effect is important and taken into consideration. Two reaction paths are investigated: one is a multi-step process with a rate-limit energy barrier of 19.1 kcal/mol, which is relatively small, and the reaction can easily occur; the other is a one-step process with a barrier of 45.0 kcal/mol, which is large and thus makes the reaction hard to occur. The reason why the two paths have different barriers is explained.
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