A dual-targeting succinate dehydrogenase and F1Fo-ATP synthase inhibitor rapidly sterilizes replicating and non-replicating Mycobacterium tuberculosis

Cara Adolph, Chen-Yi Cheung, Matthew B. McNeil, William J. Jowsey, Zoe C. Williams, Kiel Hards, Liam K. Harold, Ashraf Aboelela, Richard S. Bujaroski, Benjamin J. Buckley, Joel D. A. Tyndall, Zhengqiu Li, Julian D. Langer, Laura Preiss, Thomas Meier, Adrie J. C. Steyn, Kyu Y. Rhee, Michael Berney, Michael J. Kelso, Gregory M. Cook*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Mycobacterial bioenergetics is a validated target space for antitubercular drug development. Here, we identify BB2-50F, a 6-substituted 5-(N,N-hexamethylene)amiloride derivative as a potent, multi-targeting bioenergetic inhibitor of Mycobacterium tuberculosis. We show that BB2-50F rapidly sterilizes both replicating and non-replicating cultures of M. tuberculosis and synergizes with several tuberculosis drugs. Target identification experiments, supported by docking studies, showed that BB2-50F targets the membrane-embedded c-ring of the F1Fo-ATP synthase and the catalytic subunit (substrate-binding site) of succinate dehydrogenase. Biochemical assays and metabolomic profiling showed that BB2-50F inhibits succinate oxidation, decreases the activity of the tricarboxylic acid (TCA) cycle, and results in succinate secretion from M. tuberculosis. Moreover, we show that the lethality of BB2-50F under aerobic conditions involves the accumulation of reactive oxygen species. Overall, this study identifies BB2-50F as an effective inhibitor of M. tuberculosis and highlights that targeting multiple components of the mycobacterial respiratory chain can produce fast-acting antimicrobials.
Original languageEnglish
Pages (from-to)683-698.e7
Number of pages23
JournalCell Chemical Biology
Volume31
Issue number4
Early online date26 Dec 2023
DOIs
Publication statusPublished - 18 Apr 2024

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