Mitochondrial Respiratory Chain Enzymes (N/A)

Mitochondrial respiratory chain enzymes are a series of multi-subunit protein complexes embedded in the inner mitochondrial membrane. They form the core machinery for oxidative phosphorylation, which is the primary process by which eukaryotic cells generate ATP. These enzymes transfer electrons from metabolic substrates to molecular oxygen and couple this electron flow to proton translocation across the membrane, creating an electrochemical gradient that drives ATP synthesis. Defects in any component of this system can result in impaired cellular respiration leading to a spectrum of human diseases known as mitochondrial disorders.

Other names

Electron Transport Chain (ETC)Oxidative Phosphorylation (OXPHOS) SystemComplex I (NADH:ubiquinone oxidoreductase)Complex II (Succinate:ubiquinone oxidoreductase)Complex III (Ubiquinol:cytochrome c oxidoreductase)Complex IV (Cytochrome c oxidase)Complex V (ATP synthase)Ubiquinone/Coenzyme Q10Cytochrome c

Inhibition of electron transfer at specific complexes, disruption of proton gradient, or interference with ATP synthase activity.