Wei WM, Xu YL, Zheng RH, Zhao T, Fang W, Qin YD. Theoretical Study on the Mechanism of the Acylate Reaction of β-Lactamase.
ACS OMEGA 2021;
6:12598-12604. [PMID:
34056410 PMCID:
PMC8154126 DOI:
10.1021/acsomega.1c00592]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 04/26/2021] [Indexed: 05/25/2023]
Abstract
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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