A0A2H4QBU1 · A0A2H4QBU1_9TREE

  • Protein
    Cytochrome c oxidase subunit 3
  • Gene
    cox3
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Inferred from homology
  • Annotation score
    2/5

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.

GO annotations

all annotationsall molecular functionvirus receptor activitydna bindingrna bindingcytoskeletal motor activitycatalytic activitygtpase activitystructural molecule activitytransporter activitycytoskeletal protein bindinglipid bindingcyclase activityantioxidant activityoxidoreductase activitytransferase activityhydrolase activitylyase activityisomerase activityligase activityprotein tag activitycargo receptor activityhistone bindingprotein folding chaperonetranslation regulator activitynutrient reservoir activityreceptor ligand activitymolecular transducer activitymolecular adaptor activitytoxin activitycell adhesion mediator activitymolecular function regulator activityvirus coreceptor activitycatalytic activity, acting on a proteincatalytic activity, acting on dnacatalytic activity, acting on rnamolecular carrier activitytranscription regulator activitygeneral transcription initiation factor activitymolecular sensor activitymolecular sequestering activityatp-dependent activityother molecular functionall biological processmitotic cell cyclecytokinesiscytoplasmic translationimmune system processmuscle system processcirculatory system processrenal system processrespiratory system processcarbohydrate metabolic processgeneration of precursor metabolites and energydna replicationdna repairdna recombinationchromatin organizationdna-templated transcriptionregulation of dna-templated transcriptiontrna metabolic processprotein foldingprotein glycosylationamino acid metabolic processmodified amino acid metabolic processlipid metabolic processvitamin metabolic processsulfur compound metabolic processintracellular protein transportnucleocytoplasmic transportautophagyinflammatory responsemitochondrion organizationcytoskeleton organizationmicrotubule-based movementperoxisome organizationlysosome organizationchromosome segregationcell adhesionestablishment or maintenance of cell polarityprogrammed cell deathphotosynthesismrna metabolic processsnrna metabolic processvesicle-mediated transportreproductive processdigestive system processsignalingcell differentiationprotein catabolic processextracellular matrix organizationregulatory ncrna-mediated gene silencingtelomere organizationcell junction organizationwound healingribosome biogenesiscilium organizationanatomical structure developmentcell motilitynervous system processendocrine processprotein maturationtransmembrane transportnucleobase-containing small molecule metabolic processhepaticobiliary system processmembrane organizationprotein-containing complex assemblycell wall organization or biogenesisnitrogen cycle metabolic processprotein localization to plasma membranedefense response to other organismdetoxificationmeiotic nuclear divisionmitotic nuclear divisionmitochondrial gene expressioncarbohydrate derivative metabolic processother biological processall cellular componentnuclear chromosomeextracellular regionextracellular spacecell wallnucleusnuclear envelopenucleoplasmchromosomenucleolusmitochondrionlysosomeendosomevacuoleperoxisomeendoplasmic reticulumgolgi apparatuslipid dropletmicrotubule organizing centercytosolribosomecytoskeletonplasma membraneciliumplastidthylakoidexternal encapsulating structureextracellular matrixcytoplasmic vesicleorganelleother cellular component
Cell color indicative of number of GO terms
AspectTerm
Cellular Componentmembrane
Cellular Componentmitochondrion
Molecular Functioncytochrome-c oxidase activity
Biological Processmitochondrial electron transport, cytochrome c to oxygen

Keywords

Names & Taxonomy

Protein names

  • Recommended name
    Cytochrome c oxidase subunit 3

Gene names

    • Name
      cox3

Encoded on

  • Mitochondrion

Organism names

  • Taxonomic identifier
  • Organism
  • Strain
    • TF12
  • Taxonomic lineage
    Eukaryota > Fungi > Dikarya > Basidiomycota > Agaricomycotina > Tremellomycetes > Tremellales > Tremellaceae > Tremella

Accessions

  • Primary accession
    A0A2H4QBU1

Subcellular Location

Membrane
; Multi-pass membrane protein

Features

Showing features for transmembrane.

TypeIDPosition(s)Description
Transmembrane21-39Helical
Transmembrane45-63Helical
Transmembrane84-107Helical
Transmembrane127-151Helical
Transmembrane163-182Helical
Transmembrane202-225Helical
Transmembrane245-265Helical

Keywords

Family & Domains

Features

Showing features for domain.

TypeIDPosition(s)Description
Domain7-266Heme-copper oxidase subunit III family profile

Sequence similarities

Belongs to the cytochrome c oxidase subunit 3 family.

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    271
  • Mass (Da)
    30,064
  • Last updated
    2018-02-28 v1
  • Checksum
    78FDFD1D38D37A79
MPRALFQSHPYHLVEFSPWPILMANAVFSMMAGGVLYMHGIAHGFTFLILGFLATLFAFILWFRDVTTEGTYLGDHTLVVQKGLTMGVSLFILSEVFFFISIFWAYFHSSLAPTVELGSQWPPRGITALNPMTVPLLNTILLLSSGATVTYAHHALIEGNRGAAILGGALTIVLALVFTGLQGLEYVEADFTIADGVYGSCFFFSTVFHGFHVIIGTLFIAVGLYRIIAYHYTAEHHIGLESAILYWHFVDIVWLFLYAAVYWWGSDGVFG

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
MF422655
EMBL· GenBank· DDBJ
ATX62093.1
EMBL· GenBank· DDBJ
Genomic DNA

Similar Proteins

Disclaimer

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