Accession ID Name Pfam Type
PF02921 Ubiquinol cytochrome reductase transmembrane region family

Each subunit of the cytochrome bc1 complex provides a single helix (this family) to make up the transmembrane region of the complex.
Pfam Range: 13-76 DPAM-Pfam Range: 26-45
Uniprot ID: D6X499
Pfam Range: 81-146 DPAM-Pfam Range: 90-115
Uniprot ID: F4WQ83
Pfam Range: 79-144 DPAM-Pfam Range: 88-113
Uniprot ID: R4G8P6

References

1: Complete structure of the 11-subunit bovine mitochondrial cytochrome bc1 complex [see comments] Iwata S, Lee JW, Okada K, Lee JK, Iwata M, Rasmussen B, Link TA, Ramaswamy S, Jap BK; Science 1998;281:64-71. PMID:9651245