beta-Lactamase hydrolysis of cephalosporin 3'-quinolone esters, carbamates, and tertiary amines.

AUTOR(ES)

Georgopapadakou, N H

RESUMO

The beta-lactam hydrolysis of five cephalosporin 3'-quinolones (dual-action cephalosporins) by three gram-negative beta-lactamases was examined. The dual-action cephalosporins tested were the ester Ro 23-9424; the carbamates Ro 25-2016, Ro 25-4095, and Ro 25-4835; and the tertiary amine Ro 25-0534. Also tested were cephalosporins with similar side chains (cefotaxime, desacetylcefotaxime, cephalothin, cephacetrile, and Ro 09-1227 [SR 0124]) and standard beta-lactams (penicillin G, cephaloridine). The beta-lactamases used were the plasmid-mediated TEM-1 and TEM-3 enzymes and the chromosomal AmpC. The cephacetrile-related compounds Ro 25-4095 and Ro 25-4835 were hydrolyzed by all three beta-lactamases with catalytic efficiencies (relative to penicillin G) ranging from approximately 5 (TEM-1, AmpC) to approximately 25 (TEM-3). The cephalothin-related Ro 25-2016 was also hydrolyzed by all three beta-lactamases, particularly the AmpC enzyme (relative catalytic efficiency, 110). The cefotaxime-related compounds Ro 25-0534 and Ro 23-9424 were hydrolyzed to any significant extent only by the TEM-3 enzyme (relative catalytic efficiencies, 1.2 and 4.7, respectively.

Documentos Relacionados

• Mechanisms of action of cephalosporin 3'-quinolone esters, carbamates, and tertiary amines in Escherichia coli.
• Hydrolysis of Cefotaxime by a beta-lactamase from Bacteroides fragilis.
• In vitro activity and beta-lactamase stability of cefodizime, an aminothiazolyl iminomethoxy cephalosporin.
• In vitro activity and beta-lactamase stability of FK-037, a parenteral cephalosporin.
• Beta-lactamase stability and antibacterial activity of cefmenoxime (SCE-1365), a novel cephalosporin.