Mycobacterium tuberculosis respiratory chain and cell membrane (Mtb respiratory chain/membrane)

The Mycobacterium tuberculosis (Mtb) respiratory chain and cell membrane constitute a complex system of enzymes and structural components essential for the pathogen's survival, particularly during latent or persistent phases. The respiratory chain includes key complexes such as NADH dehydrogenase (NDH-1 and NDH-2), the cytochrome bc1-aa3 oxidase complex, and ATP synthase, which together generate the proton motive force required for ATP production (Cook et al., 2014). The mycobacterial membrane is uniquely characterized by a thick layer of mycolic acids, providing a robust physical barrier and anchoring various metabolic proteins (Kundu et al., 2017). This system is a major focus of modern antitubercular drug development; for instance, Bedaquiline inhibits the c-subunit of ATP synthase, while Telacebec targets the QcrB subunit of the cytochrome bcc complex (Andries et al., 2005; Pethe et al., 2013). By disrupting energy production and membrane stability, these drugs can effectively kill both actively replicating and non-replicating bacteria. However, because these processes are fundamental to life, therapeutic agents must be highly selective for mycobacterial proteins over human mitochondrial counterparts to minimize systemic toxicity (Bald et al., 2017).

Other names

Mtb oxidative phosphorylation systemMtb electron transport chainMycobacterial cell envelopeMtb bioenergetics pathway

Inhibition of ATP synthase, blockade of the cytochrome bcc complex, inhibition of NADH dehydrogenase, and disruption of mycolic acid synthesis or membrane potential.