title: Beta-lactamase inhibitory activities and synergistic effects of 5,6-cis-carbapenem antibiotics.
abstract: Twelve 5,6-cis-carbapenem antibiotics were examined for their beta-lactamase inhibitory activities, their types of inhibitions, and their synergistic activities with other beta-lactam antibiotics. All the carbapenems inhibited eight types of beta-lactamases including cephalosporinases which were insensitive to clavulanic acid and sulbactam. The sulfonyloxy ethyl carbapenems were the most active inhibitors; they inhibited all beta-lactamases in a progressive fashion, whereas some of the hydroxyl compounds exerted non-progressive inhibition against several beta-lactamases such as those of Escherichia coli TN713 and Proteus vulgaris GN4413. Several carbapenems were inactivated by the beta-lactamases of Citrobacter freundii GN1706, P. vulgaris GN4413, E. coli TN713, and Klebsiella pneumoniae TN1698. Most of the carbapenems potentiated the antibacterial activities of ampicillin and cefotiam against beta-lactamase-producing bacteria.
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects* / Q000201:enzymology; D004357:Drug Synergism; D013329:Structure-Activity Relationship; D013845:Thienamycins / Q000494:pharmacology*; D065093:beta-Lactamase Inhibitors
chemical_list: D000900:Anti-Bacterial Agents; D013845:Thienamycins; D065093:beta-Lactamase Inhibitors