Q9MNC3 · Q9MNC3_9MUSC

  • Protein
    Cytochrome c oxidase subunit 1
  • Gene
    COI
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    3/5

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

Cofactor

heme (UniProtKB | Rhea| CHEBI:30413 )

Pathway

Energy metabolism; oxidative phosphorylation.

GO annotations

AspectTerm
Cellular Componentmitochondrial inner membrane
Cellular Componentrespirasome
Molecular Functioncytochrome-c oxidase activity
Molecular Functionheme binding
Molecular Functionmetal ion binding
Biological Processoxidative phosphorylation

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

  • Taxonomic identifier
  • Organism
  • Taxonomic lineage
    Eukaryota > Metazoa > Ecdysozoa > Arthropoda > Hexapoda > Insecta > Pterygota > Neoptera > Endopterygota > Diptera > Brachycera > Muscomorpha > Muscoidea > Scathophagidae > Scathophaginae > Gimnomera

Accessions

  • Primary accession
    Q9MNC3

Subcellular Location

Mitochondrion inner membrane
; Multi-pass membrane protein

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane27-46Helical
Transmembrane58-80Helical
Transmembrane92-114Helical
Transmembrane126-149Helical
Transmembrane169-191Helical
Transmembrane203-228Helical

Keywords

Interaction

Subunit

Component of the cytochrome c oxidase (complex IV, CIV), a multisubunit enzyme composed of a catalytic core of 3 subunits and several supernumerary subunits. The complex exists as a monomer or a dimer and forms supercomplexes (SCs) in the inner mitochondrial membrane with ubiquinol-cytochrome c oxidoreductase (cytochrome b-c1 complex, complex III, CIII).

Family & Domains

Features

Showing features for domain.

TypeIDPosition(s)Description
Domain1-267Cytochrome oxidase subunit I profile

Sequence similarities

Belongs to the heme-copper respiratory oxidase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Fragment
  • Length
    269
  • Mass (Da)
    30,092
  • Last updated
    2000-10-01 v1
  • Checksum
    9CF44C8922DA0044
LILPGFGMISHIISQESGKKETFGSLGMIYAMLAIGLLGFIVWAHHMFTVGMDVDTRAYFTSATMIIAVPTGIKIFSWLATLYGTQLNYSPATLWSLGFVFLFTVGGLTGVVLANSSVDIILHDTYYVVAHFHYVLSMGAVFAIMAGFVHWYPLFTGLTMNNTLLKSQFIIMFIGVNLTFFPQHFLGLAGMPRRYSDYPDAYTTWNVISTIGSTISLLGILFFFFIIWESLVSKRQVLFPLQLNSSIEWLQNTPPAEHSYSELPLLTNF

Features

Showing features for non-terminal residue.

TypeIDPosition(s)Description
Non-terminal residue1

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AF181009
EMBL· GenBank· DDBJ
AAF34496.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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