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Schematic presentation of the interaction of penicillin-binding proteins and β-lactamases with β-lactam antibiotics. Both β-lactamases and PBPs form an acyl–enzyme complex. Only β-lactamases and some PBPs (for example, PBP5) can catalyze the deacylation of this complex. (A) Formation of the acyl-enzyme complex; (B) Deacylation of the acyl-enzyme complex.
