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A) The penicillin, cephalosporin, penem, and carbapenem β‐lactam classes. B) Reaction of the nucleophilic serine (PBPs, SBLs) or cysteine (Ldts) with a generic penicillin, forming an acyl‐enzyme complex which can undergo hydrolysis or C5–C6 fragmentation. MS data for LdtMt2 (4 μm) incubated with a 100‐fold excess of C) oxacillin for 2 h, and D) faropenem for 10 min. Black spectra: LdtMt2; blue spectra: LdtMt2 with the indicated β‐lactam.
