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• W2169587737 startingPage "2215" @default.
• W2169587737 abstract "ABSTRACT A detailed kinetic study of the interaction between two ethylidene derivatives of tricyclic carbapenems, Lek 156 and Lek 157, and representative β-lactamases and d -alanyl– d -alanine peptidases ( dd -peptidases) is presented. Both compounds are very efficient inactivators of the Enterobacter cloacae 908R β-lactamase, which is usually resistant to inhibition. Preliminary experiments indicate that various extended-spectrum class C β-lactamases (ACT-1, CMY-1, and MIR-1) are also inactivated. With the E. cloacae 908R enzyme, complete inactivation occurs with a second-order rate constant, k 2 / K ′, of 2 × 10 4 to 4 × 10 4 M −1 s −1 , and reactivation is very slow, with a half-life of >1 h. Accordingly, Lek 157 significantly decreases the MIC of ampicillin for E. cloacae P99, a constitutive class C β-lactamase overproducer. With the other serine β-lactamases tested, the covalent adducts exhibit a wide range of stabilities, with half-lives ranging from long (>4 h with the TEM-1 class A enzyme), to medium (10 to 20 min with the OXA-10 class D enzyme), to short (0.2 to 0.4 s with the NmcA class A β-lactamase). By contrast, both carbapenems behave as good substrates of the Bacillus cereus metallo-β-lactamase (class B). The Streptomyces sp. strain R61 and K15 extracellular dd -peptidases exhibit low levels of sensitivity to both compounds." @default.
• W2169587737 created "2016-06-24" @default.
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• W2169587737 date "2001-08-01" @default.
• W2169587737 modified "2023-09-24" @default.
• W2169587737 title "Kinetic Study of Two Novel Enantiomeric Tricyclic β-Lactams Which Efficiently Inactivate Class C β-Lactamases" @default.
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• W2169587737 doi "https://doi.org/10.1128/aac.45.8.2215-2223.2001" @default.
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