B2XM03 · B2XM03_HUMAN
- ProteinCytochrome c oxidase subunit 1
- GeneCOX1
- StatusUniProtKB unreviewed (TrEMBL)
- Organism
- Amino acids513 (go to sequence)
- Protein existenceInferred from homology
- Annotation score3/5
Function
function
Component of the cytochrome c oxidase, the last enzyme in the mitochondrial electron transport chain which drives oxidative phosphorylation. The respiratory chain contains 3 multisubunit complexes succinate dehydrogenase (complex II, CII), ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII) and cytochrome c oxidase (complex IV, CIV), that cooperate to transfer electrons derived from NADH and succinate to molecular oxygen, creating an electrochemical gradient over the inner membrane that drives transmembrane transport and the ATP synthase. Cytochrome c oxidase is the component of the respiratory chain that catalyzes the reduction of oxygen to water. Electrons originating from reduced cytochrome c in the intermembrane space (IMS) are transferred via the dinuclear copper A center (CU(A)) of subunit 2 and heme A of subunit 1 to the active site in subunit 1, a binuclear center (BNC) formed by heme A3 and copper B (CU(B)). The BNC reduces molecular oxygen to 2 water molecules using 4 electrons from cytochrome c in the IMS and 4 protons from the mitochondrial matrix.
Catalytic activity
- 4 Fe(II)-[cytochrome c] + O2 + 8 H+(in) = 4 Fe(III)-[cytochrome c] + 2 H2O + 4 H+(out)This reaction proceeds in the forward direction.
4 RHEA-COMP:10350 + CHEBI:15379 + 8 H+ (in)CHEBI:15378= 4 RHEA-COMP:14399 + 2 CHEBI:15377 + 4 H+ (out)CHEBI:15378
Cofactor
Protein has several cofactor binding sites:
Pathway
Energy metabolism; oxidative phosphorylation.
GO annotations
Aspect | Term | |
---|---|---|
Cellular Component | mitochondrial inner membrane | |
Cellular Component | respiratory chain complex IV | |
Molecular Function | cytochrome-c oxidase activity | |
Molecular Function | heme binding | |
Molecular Function | metal ion binding | |
Biological Process | oxidative phosphorylation |
Keywords
- Biological process
- Ligand
Enzyme and pathway databases
Names & Taxonomy
Protein names
- Recommended nameCytochrome c oxidase subunit 1
- EC number
Gene names
Encoded on
- Mitochondrion
Organism names
- Organism
- Strain
- Taxonomic lineageEukaryota > Metazoa > Chordata > Craniata > Vertebrata > Euteleostomi > Mammalia > Eutheria > Euarchontoglires > Primates > Haplorrhini > Catarrhini > Hominidae > Homo
Accessions
- Primary accessionB2XM03
Subcellular Location
UniProt Annotation
GO Annotation
Membrane ; Multi-pass membrane protein
Mitochondrion inner membrane ; Multi-pass membrane protein
Features
Showing features for transmembrane.
Type | ID | Position(s) | Description | ||
---|---|---|---|---|---|
Transmembrane | 18-37 | Helical | |||
Transmembrane | 57-83 | Helical | |||
Transmembrane | 104-128 | Helical | |||
Transmembrane | 148-171 | Helical | |||
Transmembrane | 183-210 | Helical | |||
Transmembrane | 243-261 | Helical | |||
Transmembrane | 268-291 | Helical | |||
Transmembrane | 303-325 | Helical | |||
Transmembrane | 337-359 | Helical | |||
Transmembrane | 379-400 | Helical | |||
Transmembrane | 412-430 | Helical | |||
Transmembrane | 450-473 | Helical | |||
Keywords
- Cellular component
PTM/Processing
Proteomic databases
Structure
Family & Domains
Sequence
- Sequence statusComplete
- Length513
- Mass (Da)57,025
- Last updated2008-07-01 v1
- Checksum2C83808C2986A1EB
Sequence databases
Nucleotide Sequence | Protein Sequence | Molecule Type | Status | |
---|---|---|---|---|
EU092861 EMBL· GenBank· DDBJ | ABU66610.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
MF696004 EMBL· GenBank· DDBJ | AUT79163.1 EMBL· GenBank· DDBJ | Genomic DNA | ||
MK248366 EMBL· GenBank· DDBJ | QFV15541.1 EMBL· GenBank· DDBJ | Genomic DNA |