Q3UBX7 · Q3UBX7_MOUSE

  • Protein
    Complement C1q subcomponent subunit A
  • Gene
    C1qa
  • Status
    UniProtKB unreviewed (TrEMBL)
  • Amino acids
  • Protein existence
    Evidence at transcript level
  • Annotation score
    2/5

Function

function

C1q associates with the proenzymes C1r and C1s to yield C1, the first component of the serum complement system. The collagen-like regions of C1q interact with the Ca2+-dependent C1r2C1s2 proenzyme complex, and efficient activation of C1 takes place on interaction of the globular heads of C1q with the Fc regions of IgG or IgM antibody present in immune complexes.

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 Componentextracellular region

Keywords

Names & Taxonomy

Protein names

  • Recommended name
    Complement C1q subcomponent subunit A

Gene names

    • Name
      C1qa

Organism names

  • Taxonomic identifier
  • Organism
  • Strain
    • C57BL/6J
  • Taxonomic lineage
    Eukaryota > Metazoa > Chordata > Craniata > Vertebrata > Euteleostomi > Mammalia > Eutheria > Euarchontoglires > Glires > Rodentia > Myomorpha > Muroidea > Muridae > Murinae > Mus > Mus

Accessions

  • Primary accession
    Q3UBX7

Organism-specific databases

Subcellular Location

Keywords

  • Cellular component

PTM/Processing

Features

Showing features for signal, chain.

Type
IDPosition(s)Description
Signal1-22
ChainPRO_500422987623-245Complement C1q subcomponent subunit A

Keywords

Interaction

Subunit

C1 is a calcium-dependent trimolecular complex of C1q, R and S in the molar ration of 1:2:2. C1q subcomponent is composed of nine subunits, six of which are disulfide-linked dimers of the A and B chains, and three of which are disulfide-linked dimers of the C chain. Interacts (via C-terminus) with CD33; this interaction activates CD33 inhibitory motifs. Interacts with CR1 (via Sushi 24 and Sushi 25 domains). Antigen-bound IgM (via the Fc region) interacts with the globular domains of C1q component of the complement system, all three modules C1QA, C1QB and C1QC being involved in IgM binding; this interaction is multivalent. It initiates the classical complement pathway.

Family & Domains

Features

Showing features for region, domain.

Type
IDPosition(s)Description
Region28-114Disordered
Domain110-245C1q

Keywords

Family and domain databases

Sequence

  • Sequence status
    Complete
  • Length
    245
  • Mass (Da)
    26,046
  • Last updated
    2005-10-11 v1
  • Checksum
    77F61078097B2022
METSQGWLVACVLTMTLVWTVAEDVCRAPNGKDGAPGNPGRPGRPGLKGERGEPGAAGIRTGIRGFKGDPGESGPPGKPGNVGLPGPSGPLEDSGPQGLKGVKGNPGNIRDQPRPAFSAIRQNPMTLGNVVIFDKVLTNQESPYQNHTGRFICAVPGFYYFNFQVISKWDLCLFIKSSSGGQPRDSLSFSNTNNKGLFQVLAGGTVLQLRRGDEVWIEKDPAKGRIYQGTEADSIFSGFLIFPSA

Sequence databases

Nucleotide SequenceProtein SequenceMolecule TypeStatus
AK150771
EMBL· GenBank· DDBJ
BAE29837.1
EMBL· GenBank· DDBJ
mRNA

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