title: Interaction of clavulanic acid, sulbactam and cephamycin antibiotics with beta-lactamases.
abstract: The inhibitory effects of clavulanic acid, sulbactam and cephamycin antibiotics on chromosomally-mediated or plasmid-mediated beta-lactamases were investigated. The inhibition constants were determined by a non-linear regression analysis. Clavulanic acid and sulbactam had high affinities for the purified plasmid-mediated beta-lactamases such as SHV-1, TEM-1 and PSE-4, and were potent inhibitors as shown by their low Ki values. Except for Bacteroides beta-lactamase, which is sensitive to inhibition by cephamycin antibiotics, clavulanic acid and sulbactam were found not to be as effective against chromosomally-mediated beta-lactamases. The cephamycin antibiotics were better inhibitors of chromosomally-mediated beta-lactamases than those that are plasmid mediated. Except for P99 beta-lactamase, against which sulbactam and clavulanic acid were inactive, the cephamycin antibiotics were less effective inhibitors than sulbactam and clavulanic acid.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000201:enzymology; D002513:Cephamycins / Q000494:pharmacology*; D019818:Clavulanic Acid; D002969:Clavulanic Acids / Q000494:pharmacology*; D004347:Drug Interactions; D008826:Microbial Sensitivity Tests; D010397:Penicillanic Acid / Q000494:pharmacology*; D013407:Sulbactam; D065093:beta-Lactamase Inhibitors; D001618:beta-Lactamases / Q000302:isolation & purification
chemical_list: D000900:Anti-Bacterial Agents; D002513:Cephamycins; D002969:Clavulanic Acids; D065093:beta-Lactamase Inhibitors; D019818:Clavulanic Acid; D010397:Penicillanic Acid; D001618:beta-Lactamases; D013407:Sulbactam