Mycobacterial energy metabolism components

Mycobacterial energy metabolism components refer to the specialized machinery used by Mycobacterium tuberculosis to generate cellular energy through oxidative phosphorylation. This system includes essential enzymes such as ATP synthase, the cytochrome bc1-aa3 oxidase complex, and various dehydrogenases that maintain the electrochemical gradient across the bacterial membrane (Cook et al., 2014, PubMed: 25157167). Unlike many other pathogens, M. tuberculosis is an obligate aerobe that depends heavily on these respiratory chain components for survival during both active infection and latent persistence (Bald et al., 2017, PubMed: 28348141). Therapeutic intervention in this pathway has been highly successful, exemplified by the approval of bedaquiline, which binds to the c-subunit of ATP synthase to halt ATP production (Andries et al., 2005, PubMed: 15647434). Other clinical candidates like telacebec target the QcrB subunit of the cytochrome bc1 complex, effectively blocking electron transport and reducing cellular ATP levels (Pethe et al., 2013, PubMed: 23913023). Because these metabolic pathways are distinct from human mitochondrial respiration in specific structural ways, they offer a high degree of selectivity for treating tuberculosis, including drug-resistant strains. However, challenges remain regarding the potential for cardiotoxicity, such as QT interval prolongation, and the need for long-term treatment regimens to ensure complete eradication of dormant bacilli.

Other names

Mycobacterial respiratory chainMycobacterial oxidative phosphorylation systemMtb energy metabolismMycobacterial electron transport chain

Inhibition of ATP synthase (AtpE subunit), inhibition of the cytochrome bc1-aa3 oxidase complex (QcrB subunit), and disruption of the respiratory electron transport chain or proton motive force (Cook et al., 2014, PubMed: 25157167).