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• W2137209310 abstract "Members of the beta-lactam class of antibiotics, which inhibit the bacterial d,d-transpeptidases involved in cell wall biosynthesis, have never been used systematically in the treatment of Mycobacterium tuberculosis infections because of this organism's resistance to beta-lactams. The critical resistance factor is the constitutive production of a chromosomally encoded, Ambler class A beta-lactamase, BlaC in M. tuberculosis. We show that BlaC is an extended spectrum beta-lactamase (ESBL) with high levels of penicillinase and cephalosporinase activity as well as measurable activity with carbapenems, including imipenem and meropenem. We have characterized the enzyme's inhibition by three FDA-approved beta-lactamase inhibitors: sulbactam, tazobactam, and clavulanate. Sulbactam inhibits the enzyme competitively and reversibly with respect to nitrocefin. Tazobactam inhibits the enzyme in a time-dependent manner, but the activity of the enzyme reappears due to the slow hydrolysis of the covalently acylated enzyme. In contrast, clavulanate reacts with the enzyme quickly to form hydrolytically stable, inactive forms of the enzyme that have been characterized by mass spectrometry. Clavulanate has potential to be used in combination with approved beta-lactam antibiotics to treat multi-drug resistant (MDR) and extremely drug resistant (XDR) strains of M. tuberculosis." @default.
• W2137209310 created "2016-06-24" @default.
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• W2137209310 date "2007-10-01" @default.
• W2137209310 modified "2023-10-01" @default.
• W2137209310 title "Irreversible Inhibition of the <i>Mycobacterium tuberculosis</i> β-Lactamase by Clavulanate" @default.
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• W2137209310 doi "https://doi.org/10.1021/bi701506h" @default.
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