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. 1983 Mar 1;209(3):609–615. doi: 10.1042/bj2090609

Inactivation of TEM-1 beta-lactamase by 6-acetylmethylenepenicillanic acid.

M Arisawa, R Then
PMCID: PMC1154137  PMID: 6307259

Abstract

6-Acetylmethylenepenicillanic acid is a new kinetically irreversible inhibitor of various beta-lactamases. Interaction between 6-acetylmethylenepenicillanate and purified TEM-1 beta-lactamase during the inactivation process was investigated. 6-Acetylmethylenepenicillanate inhibited the enzyme in a second-order fashion with a rate constant of 0.61 microM-1 . S-1. The apparent inactivation constant decreased in the presence of increasing concentrations of the substrate benzylpenicillin. Native enzyme (pI 5.4) was converted into two inactive forms with pI 5.25 and 5.15, the latter form being transient and readily converted into the more stable form with pI 5.15. Even a 50-fold excess of inhibitor over enzyme did not produce any other inactivated species of the enzyme. All the results obtained suggest that 6-acetylmethylenepenicillanate is a potent irreversible and active-site-directed inhibitor of TEM-1 beta-lactamase.

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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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