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Detection of inhibitors of phenotypically drug-tolerant Mycobacterium tuberculosis using an in vitro bactericidal screen
journal contribution
posted on 2023-05-18, 04:13 authored by Bassett, IM, Lun, S, Bishai, WR, Guo, H, Kirman, JR, Altaf, M, O'Toole, RFMany whole cell screens of chemical libraries currently in use are based on inhibition of bacterial growth. The goal of this study was to develop a chemical library screening model that enabled detection of compounds that are active against drug-tolerant non-growing cultures of Mycobacterium tuberculosis. An in vitro model of low metabolically active mycobacteria was established with 8 and 30 day old cultures of M. smegmatis and M. tuberculosis, respectively. Reduction of resazurin was used as a measure of viability and the assay was applied in screens of chemical libraries for bactericidal compounds. The model provided cells that were phenotypically-resilient to killing by first and second-line clinical drugs including rifampicin. Screening against chemical libraries identified proteasome inhibitors, NSC310551 and NSC321206, and a structurally-related series of thiosemicarbazones, as having potent killing activity towards aged cultures. The inhibitors were confirmed as active against virulent M. tuberculosis strains including multi- and extensively-drug resistant clinical isolates. Our library screen enabled detection of compounds with a potent level of bactericidal activity towards phenotypically drug-tolerant cultures of M. tuberculosis.
History
Publication title
Journal of MicrobiologyVolume
51Issue
5Pagination
651-658ISSN
1225-8873Department/School
Tasmanian School of MedicinePublisher
Microbiology Soc KoreaPlace of publication
Korea Science & Technology Center 803, 635-4 Yeogsam-Dong, Kangnam-Ku, Seoul, South Korea, 135-703Repository Status
- Restricted