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. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: Infect Dis Clin North Am. 2020 Sep 30;34(4):773–819. doi: 10.1016/j.idc.2020.05.001

Fig. 2.

Fig. 2.

The class A and class C serine β-lactamase mechanism involves acylation and deacylation through high-energy tetrahedral transition states. In this example with a class C enzyme, B and HB+ represent a generic base and conjugate acid, respectively. The identity of the bases may vary by class, enzyme, and substrate.