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. 1978 Jan 1;169(1):197–204. doi: 10.1042/bj1690197

Reversible inhibitors of penicillinases.

P A Kiener, S G Waley
PMCID: PMC1184209  PMID: 415738

Abstract

Reversible competitive inhibitors of a penicillinase, beta-lactamase 1 from Bacillus cereus, were studied. These represent the first inhibitors of a penicillinase that lack the beta-lactam ring. The products of the enzymic reaction, namely penicilloic acids, are inhibitors; their decarboxylation products, the penilloic acids, are also inhibitors, and have somewhat lower Ki values. Inhibitors have been prepared from benzylpenicillin, phenoxymethyl-penicillin, methicillin (2,6-dimethoxybenzamidopenicillanic acid) and 3-hydroxy-4-nitrobenzamidopenicillanic acid. Decarboxylation of the penicilloic acids from benzyl-penicillin, or from phenoxymethylpenicillin, leads to epimerization (at C-5) of the penilloic acid. Nuclear-magnetic resonance spectroscopy at a frequency of 270 MHz can distinguish the epimers. Other competitive inhibitors studied were boric acid, benzene boronic acid and m-aminobenzeneboronic acid. Boric acid itself was the best inhibitor of beta-lactamase I so far found.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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