Bacterial membrane-bound respiratory enzymes

Bacterial membrane-bound respiratory enzymes are essential protein complexes located within the bacterial cytoplasmic membrane that drive the electron transport chain and oxidative phosphorylation (1.1.1, 1.4.2). These enzymes, which include NADH dehydrogenases (NDH-1 and NDH-2), succinate dehydrogenase, cytochrome bcc complexes, and various terminal oxidases, work together to create a proton motive force used by ATP synthase to generate cellular energy (1.2.3, 1.4.1). Unlike human mitochondria, bacterial respiratory chains are often branched and contain unique enzymes like cytochrome bd oxidase or NDH-2, which lack human homologs, making them ideal targets for selective antimicrobial therapy (1.2.4, 1.4.1). Drugs such as bedaquiline, which inhibits ATP synthase, and telacebec, which targets the cytochrome bcc complex, have demonstrated the clinical utility of this approach, particularly in treating multidrug-resistant tuberculosis (1.2.1, 1.3.1). These enzymes are critical not only for actively growing bacteria but also for the survival of dormant or persistent cells that maintain a minimal metabolic state (1.1.1, 1.4.1). Consequently, inhibiting these respiratory components can lead to rapid ATP depletion, loss of membrane potential, and eventual bacterial cell death (1.3.1, 1.4.4).

Other names

Bacterial respiratory chainBacterial electron transport chainOxidative phosphorylation enzymesBacterial respiratory complexesBacterial membrane-bound oxidoreductases

Inhibition of oxidative phosphorylation by blocking electron transfer or ATP synthesis, leading to depletion of cellular energy and disruption of the proton motive force.