Menaquinone:cytochrome c reductase, cytochrome b/c subunit (IPR012049)

Short name: MenaQ_cyt_c_Rdtase_cyt_b/c-su

Overlapping homologous superfamilies

Family relationships



The qcr operon in Bacillus subtilis encodes the menaquinone:cytochrome c reductase complex, which is closely related to but distinct from mitochondrial cytochrome bc1 and chloroplast b6f complexes. QcrA is similar to Rieske-type iron-sulphur proteins; QcrB is similar in size and sequence to b-type cytochromes from b6f complexes; and QcrC has a novel structure that resembles a fusion between subunit IV of b6f complexes and cytochrome c. The amino (subunit IV) region of QcrC appears to have three transmembrane domains. The carboxyl (cytochrome c) region most closely resembles the small cytochromes c-550 (IPR012218) found in Bacillus species [PMID: 7592464].

GO terms

Biological Process

No terms assigned in this category.

Molecular Function

GO:0009055 electron transfer activity
GO:0020037 heme binding
GO:0005506 iron ion binding

Cellular Component

GO:0016021 integral component of membrane

Contributing signatures

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