Cytochrome b (IPR030689)

Short name: Cytochrome_b

Overlapping homologous superfamilies

Family relationships



Cytochrome b is a component of the ubiquinol-cytochrome c reductase complex (complex III or cytochrome b-c1 complex) in the mitochondrion of eukaryotes and in aerobic prokaryotes [PMID: 8647838]. This complex is involved in electron transport that generates an electrochemical potential coupled to ATP synthesis. Cytochrome b is the central redox catalytic subunit of the complex. It is involved in the binding of the quinone substrate and is responsible for the transmembrane electron transfer by which redox energy is converted into a protonmotive force [PMID: 8329437].

GO terms

Biological Process

GO:0006122 mitochondrial electron transport, ubiquinol to cytochrome c

Molecular Function

GO:0009055 electron transfer activity
GO:0008121 ubiquinol-cytochrome-c reductase activity

Cellular Component

GO:0045275 respiratory chain complex III

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.