title: CP-45,899, a beta-lactamase inhibitor that extends the antibacterial spectrum of beta-lactams: initial bacteriological characterization.
abstract: CP-45,899 {3,3-dimethyl-7-oxo-4-thia-1-azabicyclo(3.2.0)heptane-2-carboxylic acid, 4,4-dioxide, [2S-(2alpha,5alpha)]} is an irreversible inhibitor of several bacterial penicillinases and cephalosporinases. In the presence of low concentrations of CP-45,899, ampicillin and other beta-lactams readily inhibit the growth of a variety of resistant bacteria that contain beta-lactamases. CP-45,899 used alone displays only weak antibacterial activity, with the notable exception of its potent effects on susceptible and resistant strains of Neisseria gonorrhoeae. CP-45,899 appears to be somewhat less potent but markedly more stable (in aqueous solution) than the recently described beta-lactamase inhibitor clavulanic acid. The spectrum extensions provided by the two compounds are similar. A 1:1 mixture of CP-45,899 and ampicillin displays marked antimicrobial activity in mice experimentally infected with ampicillin-resistant Staphylococcus aureus, Haemophilus influenzae, Klebsiella pneumoniae, and Proteus vulgaris.
mesh_terms: D000667:Ampicillin / Q000008:administration & dosage; D001419:Bacteria / Q000187:drug effects*; D004359:Drug Therapy, Combination; D013844:Thiazoles / Q000494:pharmacology*; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams / Q000494:pharmacology
chemical_list: D013844:Thiazoles; D065093:beta-Lactamase Inhibitors; D047090:beta-Lactams; D000667:Ampicillin