O03288 · O03288_STEPR
- ProteinCytochrome b
- Genecytb
- StatusUniProtKB unreviewed (TrEMBL)
- Amino acids340 (go to sequence)
- Protein existenceEvidence at transcript level
- Annotation score2/5
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:
Note: Binds 2 heme groups non-covalently.
Note: Binds 2 heme groups non-covalently.
Features
Showing features for binding site.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Binding site | 50 | Fe (UniProtKB | ChEBI) of heme b b562 (UniProtKB | ChEBI); axial binding residue | |||
Binding site | 64 | Fe (UniProtKB | ChEBI) of heme b b566 (UniProtKB | ChEBI); axial binding residue | |||
Binding site | 149 | Fe (UniProtKB | ChEBI) of heme b b562 (UniProtKB | ChEBI); axial binding residue | |||
Binding site | 163 | Fe (UniProtKB | ChEBI) of heme b b566 (UniProtKB | ChEBI); axial binding residue | |||
Binding site | 168 | a ubiquinone (UniProtKB | ChEBI) | |||
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | mitochondrial inner membrane | |
Cellular Component | respiratory chain complex III | |
Molecular Function | metal ion binding | |
Molecular Function | ubiquinol-cytochrome-c reductase activity | |
Biological Process | mitochondrial electron transport, ubiquinol to cytochrome c |
Keywords
- Biological process
- Ligand
Names & Taxonomy
Protein names
- Recommended nameCytochrome b
Gene names
Encoded on
- Mitochondrion
Organism names
- Strain
- Taxonomic lineageEukaryota > Metazoa > Chordata > Craniata > Vertebrata > Euteleostomi > Archelosauria > Archosauria > Dinosauria > Saurischia > Theropoda > Coelurosauria > Aves > Neognathae > Neoaves > Charadriiformes > Stercorariidae > Stercorarius
Accessions
- Primary accessionO03288
Subcellular Location
UniProt Annotation
GO Annotation
Mitochondrion inner membrane ; Multi-pass membrane protein
Features
Showing features for transmembrane.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Transmembrane | 53-72 | Helical | |||
Transmembrane | 84-106 | Helical | |||
Transmembrane | 145-166 | Helical | |||
Transmembrane | 187-212 | Helical | |||
Transmembrane | 255-275 | Helical | |||
Transmembrane | 287-307 | Helical | |||
Transmembrane | 313-336 | Helical | |||
Keywords
- Cellular component
PTM/Processing
Features
Showing features for signal, chain.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Signal | 1-19 | ||||
Chain | PRO_5004156853 | 20-340 | Cytochrome b | ||
Structure
Family & Domains
Features
Showing features for domain.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Domain | 1-176 | Cytochrome b/b6 N-terminal region profile | |||
Domain | 177-340 | Cytochrome b/b6 C-terminal region profile | |||
Sequence similarities
Belongs to the cytochrome b family.
Keywords
- Domain
Family and domain databases
Sequence
- Sequence statusFragment
- Length340
- Mass (Da)38,047
- Last updated1997-07-01 v1
- ChecksumCD6EC27CBAF34CEF
Features
Showing features for non-terminal residue.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Non-terminal residue | 1 | ||||
Non-terminal residue | 340 | ||||
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
U76829 EMBL· GenBank· DDBJ | AAC60201.1 EMBL· GenBank· DDBJ | mRNA |