A5X2H8 · A5X2H8_9CRUS

  • 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 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

  • Taxonomic identifier
  • Organism
  • Taxonomic lineage
    Eukaryota > Metazoa > Ecdysozoa > Arthropoda > Crustacea > Branchiopoda > Notostraca > Triopsidae > Triops

Accessions

  • Primary accession
    A5X2H8

Subcellular Location

Mitochondrion inner membrane
; Multi-pass membrane protein

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane44-65Helical
Transmembrane86-110Helical
Transmembrane130-153Helical
Transmembrane165-192Helical

Keywords

Family & Domains

Features

Showing features for domain.

TypeIDPosition(s)Description
Domain1-221Cytochrome oxidase subunit I profile

Sequence similarities

Belongs to the heme-copper respiratory oxidase family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Fragment
  • Length
    221
  • Mass (Da)
    23,411
  • Last updated
    2007-07-10 v1
  • Checksum
    5D8F4392F843E904
YLIFGAWAGMVGTALSLLIRAELGQPGSLIGDDQIYNVVVTAHAFIMIFFMVMPILIGGFGNWLVPLMLGAPDMAFPRLNNMSFWLLPPALTLLLSGGAVEGGAGTGWTVYPPLSGGIAHAGASVDLSIFSLHLAGVSSILGAINFITTIINMRTSGMSLDRIPLFVWAVGITALLLLLSLPVLAGAITMLLTDRNLNTSFFDPAGGGDPILYQHLFWFFG

Features

Showing features for non-terminal residue.

TypeIDPosition(s)Description
Non-terminal residue1
Non-terminal residue221

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
DQ343234
EMBL· GenBank· DDBJ
ABC70178.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

Any medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care. Our staff consists of biologists and biochemists that are not trained to give medical advice.
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