Cytochrome b
| Cytochrome b, C-terminal domain | |||||||||
|---|---|---|---|---|---|---|---|---|---|
Mitochondrial cytochrome bc1 complex | |||||||||
| Identifiers | |||||||||
| Symbol | Cytochrom_B_C | ||||||||
| Pfam | PF00032 | ||||||||
| InterPro | IPR005798 | ||||||||
| |||||||||
Cytochrome b is a protein found in the membranes of aerobic cells. In eukaryotic mitochondria (inner membrane) and in aerobic prokaryotes, cytochrome b is a component of respiratory chain complex III (EC 1.10.2.2) — also known as the bc1 complex or ubiquinol-cytochrome c reductase. In plant chloroplasts and cyanobacteria, there is a homologous protein, cytochrome b6, a component of the plastoquinone-plastocyanin reductase (EC 1.10.99.1), also known as the b6f complex. These complexes are involved in electron transport, the pumping of protons to create a proton-motive force (PMF). This proton gradient is used for the generation of ATP. These complexes play a vital role in cells.