Q9B5D9 · Q9B5D9_ARCPO

Function

function

Component of the ubiquinol-cytochrome c reductase complex (complex III or cytochrome b-c1 complex) that is part of the mitochondrial respiratory chain. The b-c1 complex mediates electron transfer from ubiquinol to cytochrome c. Contributes to the generation of a proton gradient across the mitochondrial membrane that is then used for ATP synthesis.

Cofactor

Protein has several cofactor binding sites:
heme b (UniProtKB | Rhea| CHEBI:60344 )

Note: Binds 2 heme groups non-covalently.
heme (UniProtKB | Rhea| CHEBI:30413 )

Note: Binds 2 heme groups non-covalently.

Features

Showing features for binding site.

138050100150200250300350
TypeIDPosition(s)Description
Binding site83Fe (UniProtKB | ChEBI) of heme b b562 (UniProtKB | ChEBI); axial binding residue
Binding site97Fe (UniProtKB | ChEBI) of heme b b566 (UniProtKB | ChEBI); axial binding residue
Binding site182Fe (UniProtKB | ChEBI) of heme b b562 (UniProtKB | ChEBI); axial binding residue
Binding site196Fe (UniProtKB | ChEBI) of heme b b566 (UniProtKB | ChEBI); axial binding residue
Binding site201a ubiquinone (UniProtKB | ChEBI)

GO annotations

AspectTerm
Cellular Componentmitochondrial inner membrane
Cellular Componentrespiratory chain complex III
Molecular Functionmetal ion binding
Molecular Functionubiquinol-cytochrome-c reductase activity
Biological Processmitochondrial electron transport, ubiquinol to cytochrome c

Keywords

Names & Taxonomy

Protein names

  • Recommended name
    Cytochrome b

Gene names

    • Name
      cytb

Encoded on

  • Mitochondrion

Organism names

Accessions

  • Primary accession
    Q9B5D9

Subcellular Location

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane29-56Helical
Transmembrane77-98Helical
Transmembrane113-133Helical
Transmembrane145-166Helical
Transmembrane178-200Helical
Transmembrane229-250Helical
Transmembrane288-308Helical
Transmembrane320-341Helical
Transmembrane347-372Helical

Keywords

Family & Domains

Features

Showing features for domain.

TypeIDPosition(s)Description
Domain1-209Cytochrome b/b6 N-terminal region profile
Domain210-380Cytochrome b/b6 C-terminal region profile

Sequence similarities

Belongs to the cytochrome b family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Fragment
  • Length
    380
  • Mass (Da)
    42,355
  • Last updated
    2001-06-01 v1
  • Checksum
    753131B5A0FF3D71
MASLRKTHPLLKIANHALVDLPAPSNISVWWNFGSLLGLCLISQLLTGLFLAMHYTSDIATAFSSVAHICRDVNYEWLIRNLHANGASFFFICIYFHIGRGLYYGSYLYKETWNIGVVLLLLVMATAFVGYVLPWGQMSFWGATVITNLLSAVPYVGGTLVQWIWGGFSVDNATLTRFFAFHFLLPFIVAAMTMLHLLFLHETGSNNPLGLNSDTDKISFHPYFSYKDLLGFAGVIILLTCLALFAPSLLGDPDNFTPANPLVTPPHIKPEWYFLFAYAILRSIPNKLGGVLALLASILVLMVVPILHTSKQRSLTFRPLTQFLFWALIANVAILTWIGGMPVEEPYIIIGQVASLTYFSLFLIIIPTVAMVENKVLGWQ

Features

Showing features for non-terminal residue.

TypeIDPosition(s)Description
Non-terminal residue380

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AF240716
EMBL· GenBank· DDBJ
AAK15108.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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