Murakami K, Yoshida T. Role of the 7 alpha-methoxy and side-chain carboxyl of moxalactam in beta-lactamase stability and antibacterial activity.
Antimicrob Agents Chemother 1981;
19:1-7. [PMID:
6454378 PMCID:
PMC181347 DOI:
10.1128/aac.19.1.1]
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Abstract
The effects of the alpha-carboxyl of the phenylmalonyl side chain and the 7 alpha-methoxy group in moxalactam (6059-S) (7 beta-[2-carboxy-2-(4-hydroxyphenyl) acetamido]-7 alpha-methoxy-3[[(1-methyl-1H-tetrazol-5-y])thio] methyl]-1-oxa-1-dethia-3-cephem-4-carboxylic acid) and in the 1-sulfur congener on the stability to beta-lactamase were investigated by spectrophotometric and microbiological assays. The 7 alpha-methoxy substituent stabilized the compounds against penicillinase hydrolysis, and the alpha-carboxyl group stabilized them against cephalosporinase. An exception is the beta-lactamase produced by Proteus vulgaris, an inducible cephalosporinase, which hydrolyzed compounds having the alpha-carboxyl group but not those having the 7 alpha-methoxy group. Both substituents exerted their stabilizing effects independently, and compounds with both substituents, e.g., moxalactam (6059-S) and its 1-sulfur congener, were resistant to both penicillinases and cephalosporinases. The stabilization of the compounds to beta-lactamase hydrolysis improved their antibacterial activity against beta-lactamase-producing strains.
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