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- W1920920596 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." @default.
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- W1920920596 date "1983-03-01" @default.
- W1920920596 modified "2023-10-14" @default.
- W1920920596 title "Inactivation of TEM-1 <i>β</i>-lactamase by 6-acetylmethylenepenicillanic acid" @default.
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- W1920920596 doi "https://doi.org/10.1042/bj2090609" @default.
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