title: Role of beta-lactamase in expression of resistance by methicillin-resistant Staphylococcus aureus.
abstract: Of 27 unique clinical isolates of methicillin-resistant Staphylococcus aureus, only 4 were homogeneously resistant, and all 4 produced little or no beta-lactamase. Among heterogeneously resistant strains, those most resistant to beta-lactam antibiotics produced the most beta-lactamase. Similar genes may regulate production of the low-affinity penicillin-binding protein and beta-lactamase.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology; D019818:Clavulanic Acid; D002969:Clavulanic Acids / Q000494:pharmacology; D008712:Methicillin; D008826:Microbial Sensitivity Tests; D010403:Penicillin Resistance; D013211:Staphylococcus aureus / Q000187:drug effects* / Q000502:physiology; D001618:beta-Lactamases / Q000502:physiology*
chemical_list: D000900:Anti-Bacterial Agents; D002969:Clavulanic Acids; D019818:Clavulanic Acid; D001618:beta-Lactamases; D008712:Methicillin