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In page Beta-lactamase:
"The SBLs are similar in structure and mechanistically to the β-lactam target penicillin-binding proteins (PBPs) which are necessary for cell wall building and modifying. SBLs and PBPs both covalently change an active site serine residue. The difference between the PBPs and SBLs is that the latter generates free enzyme and inactive antibiotic by the very quick hydrolysis of the acyl-enzyme intermediate.[citation needed]
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