Coenzyme Q – cytochrome c reductase (Complex III)

Coenzyme Q – cytochrome c reductase Overview

Mitochondrial complex III, also known as coenzyme Q – cytochrome c reductase or cytochrome bc1 complex, is a central component of the mitochondrial electron transport chain (ETC). It is a multisubunit transmembrane protein complex embedded in the inner mitochondrial membrane and plays a critical role in cellular respiration by facilitating electron transfer and contributing to ATP synthesis. It accepts electrons from ubiquinol (reduced coenzyme Q) produced by complexes I and II, transfers them to cytochrome c, and pumps protons from the mitochondrial matrix into the intermembrane space, contributing to the proton motive force required for ATP synthesis. It is also a significant site for ROS production within mitochondria. Mutations in genes encoding specific subunits can lead to various mitochondrial disorders.

Mechanism of Action

Inhibition of electron transfer within Complex III, modulation of ROS generation

Biological Functions

Safety Considerations

Interacting Drugs

Associated Biomarkers