A6XDH0 · A6XDH0_ASEST

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

Cofactor

Protein has several cofactor binding sites:
Cu cation (UniProtKB | Rhea| CHEBI:23378 )

heme (UniProtKB | Rhea| CHEBI:30413 )

Pathway

Energy metabolism; oxidative phosphorylation.

GO annotations

AspectTerm
Cellular Componentmitochondrial respiratory chain complex IV
Molecular Functioncytochrome-c oxidase activity
Molecular Functionheme binding
Molecular Functionmetal ion binding
Biological Processelectron transport coupled proton transport
Biological Processmitochondrial electron transport, cytochrome c to oxygen

Keywords

Enzyme and pathway databases

Names & Taxonomy

Protein names

  • Recommended name
    Cytochrome c oxidase subunit 1
  • EC number

Gene names

    • Name
      COI

Encoded on

  • Mitochondrion

Organism names

Accessions

  • Primary accession
    A6XDH0

Subcellular Location

Mitochondrion inner membrane
; Multi-pass membrane protein

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane30-51Helical
Transmembrane63-85Helical
Transmembrane105-126Helical
Transmembrane138-157Helical

Keywords

Family & Domains

Features

Showing features for domain.

TypeIDPosition(s)Description
Domain1-163Cytochrome oxidase subunit I profile

Sequence similarities

Belongs to the heme-copper respiratory oxidase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Fragment
  • Length
    163
  • Mass (Da)
    18,053
  • Last updated
    2007-08-21 v1
  • Checksum
    13F772269C34C352
GAMMSIGFLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAIPTGVKVFSWLATLHGGNIKWSPAMLWALGFIFLFTVGGLTGIVLANSSLDIVLHDTYYVVAHFHYVLSMGAVFAIMGGFVHWFPLFSGYTLNTTWAKIHFLIMFVGVNMTFFPQHFLGLSGMP

Features

Showing features for non-terminal residue.

TypeIDPosition(s)Description
Non-terminal residue1
Non-terminal residue163

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
DQ666476
EMBL· GenBank· DDBJ
ABI36807.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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