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Mechanism of action of mycobacterium tuberculosis gyrase Inhibitors: A novel class of gyrase poisons

Gibson, Elizabeth G., Blower, Tim R., Cacho, Monica, Bax, Ben ORCID:, Berger, James M. and Osheroff, Neil 2018. Mechanism of action of mycobacterium tuberculosis gyrase Inhibitors: A novel class of gyrase poisons. ACS Infectious Diseases 4 (8) , p. 1211. 10.1021/acsinfecdis.8b00035

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Tuberculosis is one of the leading causes of morbidity worldwide, and the incidences of drug resistance and intolerance are prevalent. Thus, there is a desperate need for the development of new antitubercular drugs. Mycobacterium tuberculosis gyrase inhibitors (MGIs) are napthyridone/aminopiperidine-based drugs that display activity against M. tuberculosis cells and tuberculosis in mouse models [Blanco, D., et al. (2015) Antimicrob. Agents Chemother. 59, 1868–1875]. Genetic and mutagenesis studies suggest that gyrase, which is the target for fluoroquinolone antibacterials, is also the target for MGIs. However, little is known regarding the interaction of these drugs with the bacterial type II enzyme. Therefore, we examined the effects of two MGIs, GSK000 and GSK325, on M. tuberculosis gyrase. MGIs greatly enhanced DNA cleavage mediated by the bacterial enzyme. In contrast to fluoroquinolones (which induce primarily double-stranded breaks), MGIs induced only single-stranded DNA breaks under a variety of conditions. MGIs work by stabilizing covalent gyrase-cleaved DNA complexes and appear to suppress the ability of the enzyme to induce double-stranded breaks. The drugs displayed little activity against type II topoisomerases from several other bacterial species, suggesting that these drugs display specificity for M. tuberculosis gyrase. Furthermore, MGIs maintained activity against M. tuberuclosis gyrase enzymes that contained the three most common fluoroquinolone resistance mutations seen in the clinic and displayed no activity against human topoisomerase IIα. These findings suggest that MGIs have potential as antitubercular drugs, especially in the case of fluoroquinolone-resistant disease.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Biosciences
Publisher: American Chemical Society
ISSN: 2373-8227
Date of First Compliant Deposit: 21 November 2018
Date of Acceptance: 10 May 2018
Last Modified: 11 Nov 2023 17:21

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