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Aliases for C1R Gene

Aliases for C1R Gene

  • Complement Component 1, R Subcomponent 2 3
  • EC 4 64
  • Complement Component 1 Subcomponent R 4
  • EC 3.4.21 64

External Ids for C1R Gene

Summaries for C1R Gene

GeneCards Summary for C1R Gene

C1R (Complement Component 1, R Subcomponent) is a Protein Coding gene. Diseases associated with C1R include c1r/c1s deficiency, combined and c1s deficiency. Among its related pathways are Complement and coagulation cascades and Complement and coagulation cascades. GO annotations related to this gene include calcium ion binding and serine-type peptidase activity. An important paralog of this gene is HP.

UniProtKB/Swiss-Prot for C1R Gene

  • C1r B chain is a serine protease that combines with C1q and C1s to form C1, the first component of the classical pathway of the complement system

Gene Wiki entry for C1R Gene

No data available for Entrez Gene Summary , Tocris Summary , PharmGKB "VIP" Summary , fRNAdb sequence ontologies and piRNA Summary for C1R Gene

Genomics for C1R Gene

Genomic Location for C1R Gene

7,080,209 bp from pter
7,092,607 bp from pter
12,399 bases
Minus strand

Genomic View for C1R Gene

UCSC Golden Path with GeneCards custom track
Cytogenetic band:
Genomic Location for C1R Gene
GeneLoc Logo Genomic Neighborhood Exon StructureGene Density

RefSeq DNA sequence for C1R Gene

Regulatory Elements for C1R Gene

Proteins for C1R Gene

  • Protein details for C1R Gene (UniProtKB/Swiss-Prot)

    Protein Symbol:
    Recommended name:
    Complement C1r subcomponent
    Protein Accession:
    Secondary Accessions:
    • A6NJQ8
    • Q68D77
    • Q8J012

    Protein attributes for C1R Gene

    705 amino acids
    Molecular mass:
    80119 Da
    Quaternary structure:
    • C1 is a calcium-dependent trimolecular complex of C1q, C1r and C1s in the molar ration of 1:2:2. C1r is a dimer of identical chains, each of which is activated by cleavage into two chains, A and B, connected by disulfide bonds

    Three dimensional structures from OCA and Proteopedia for C1R Gene

neXtProt entry for C1R Gene

Proteomics data for C1R Gene at MOPED

Post-translational modifications for C1R Gene

  • The iron and 2-oxoglutarate dependent 3-hydroxylation of aspartate and asparagine is (R) stereospecific within EGF domains.
  • Modification sites at PhosphoSitePlus
  • Glycosylation at Asn125, Asn221, Asn514, and Asn581

Other Protein References for C1R Gene

Domains for C1R Gene

Gene Families for C1R Gene



  • Contains 2 CUB domains.:
    • P00736
  • Contains 1 EGF-like domain.:
    • P00736
  • Contains 1 peptidase S1 domain.:
    • P00736
  • Contains 2 Sushi (CCP/SCR) domains.:
    • P00736
  • Belongs to the peptidase S1 family.:
    • P00736
genes like me logo Genes that share domains with C1R: view

Function for C1R Gene

Molecular function for C1R Gene

GENATLAS Biochemistry: complement component 1,r subcomponent,83kDa,tetramerizing C1s (2C1r,2C1s) possessing a proteinase activity to C1s,classical pathway of C3 activation,see C1Q@
UniProtKB/Swiss-Prot CatalyticActivity: Selective cleavage of Lys(or Arg)- -Ile bond in complement subcomponent C1s to form the active form of C1s (EC
UniProtKB/Swiss-Prot Function: C1r B chain is a serine protease that combines with C1q and C1s to form C1, the first component of the classical pathway of the complement system

Enzyme Numbers (IUBMB) for C1R Gene

Gene Ontology (GO) - Molecular Function for C1R Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0003824 catalytic activity --
GO:0004252 serine-type endopeptidase activity EXP --
GO:0005509 calcium ion binding IEA --
GO:0005515 protein binding IPI 12788922
GO:0008236 serine-type peptidase activity TAS 2834284
genes like me logo Genes that share ontologies with C1R: view

No data available for Phenotypes , Animal Models , miRNA , Transcription Factor Targeting and HOMER Transcription for C1R Gene

Localization for C1R Gene

Subcellular locations from

Jensen Localization Image for C1R Gene COMPARTMENTS Subcellular localization image for C1R gene
Compartment Confidence
extracellular 5
plasma membrane 3
cytosol 1
lysosome 1
mitochondrion 1
nucleus 1

Gene Ontology (GO) - Cellular Components for C1R Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0005576 extracellular region TAS --
GO:0070062 extracellular exosome IDA 23533145
GO:0072562 blood microparticle IDA 22516433
genes like me logo Genes that share ontologies with C1R: view

Pathways for C1R Gene

genes like me logo Genes that share pathways with C1R: view

Interacting Proteins for C1R Gene

Gene Ontology (GO) - Biological Process for C1R Gene

GO ID Qualified GO term Evidence PubMed IDs
GO:0006508 proteolysis IEA --
GO:0006955 immune response TAS 737019
GO:0006956 complement activation TAS --
GO:0006958 complement activation, classical pathway TAS --
GO:0045087 innate immune response TAS --
genes like me logo Genes that share ontologies with C1R: view

Compounds for C1R Gene

(1) HMDB Compounds for C1R Gene

Compound Synonyms Cas Number PubMed IDs
  • Ca

(19) Drugbank Compounds for C1R Gene

Compound Synonyms Cas Number Type Actions PubMed IDs
  • 7E3
143653-53-6 target
331731-18-1 target
222535-22-0 target
216503-57-0 target
3458-28-4 target

(2) Novoseek inferred chemical compound relationships for C1R Gene

Compound -log(P) Hits PubMed IDs
serine 66.7 24
calcium 0 4
genes like me logo Genes that share compounds with C1R: view

Transcripts for C1R Gene

Unigene Clusters for C1R Gene

Complement component 1, r subcomponent:
Representative Sequences:

Alternative Splicing Database (ASD) splice patterns (SP) for C1R Gene

ExUns: 1a · 1b · 1c ^ 2a · 2b ^ 3a · 3b ^ 4a · 4b · 4c · 4d · 4e ^ 5a · 5b ^ 6a · 6b · 6c · 6d · 6e · 6f · 6g ^ 7a · 7b · 7c ^ 8 ^ 9a ·
SP1: - - - -
SP2: - -
SP3: - - - - - -
SP4: - - - - - -
SP5: - - - - - -
SP6: - - -
SP7: - -
SP8: -
SP9: - - - - -

ExUns: 9b

Relevant External Links for C1R Gene

GeneLoc Exon Structure for
ECgene alternative splicing isoforms for

Expression for C1R Gene

mRNA expression in normal human tissues for C1R Gene

mRNA expression in embryonic tissues and stem cells from LifeMap Discovery

mRNA differential expression in normal tissues according to GTEx for C1R Gene

This gene is overexpressed in Liver (7.7).

Integrated Proteomics: protein expression from ProteomicsDB and MOPED for C1R Gene

SOURCE GeneReport for Unigene cluster for C1R Gene Hs.524224

genes like me logo Genes that share expressions with C1R: view

Orthologs for C1R Gene

This gene was present in the common ancestor of chordates.

Orthologs for C1R Gene

Organism Taxonomy Gene Similarity Type Details
(Pan troglodytes)
Mammalia C1R 36
  • 99.57 (n)
  • 99.29 (a)
C1R 37
  • 90 (a)
(Bos Taurus)
Mammalia -- 37
  • 78 (a)
C1R 37
  • 73 (a)
(Canis familiaris)
Mammalia C1R 36
  • 87.2 (n)
  • 84.5 (a)
C1R 37
  • 75 (a)
(Mus musculus)
Mammalia C1ra 36
  • 83.62 (n)
  • 81.25 (a)
C1ra 16
C1ra 37
  • 73 (a)
C1rb 37
  • 72 (a)
(Monodelphis domestica)
Mammalia -- 37
  • 64 (a)
(Ornithorhynchus anatinus)
Mammalia -- 37
  • 61 (a)
(Rattus norvegicus)
Mammalia C1r 36
  • 83.97 (n)
  • 83.26 (a)
(Gallus gallus)
Aves -- 37
  • 58 (a)
C1R 36
  • 65.75 (n)
  • 62.63 (a)
(Anolis carolinensis)
Reptilia -- 37
  • 55 (a)
tropical clawed frog
(Silurana tropicalis)
Amphibia LOC100498646 36
  • 59.48 (n)
  • 53.5 (a)
sea squirt
(Ciona savignyi)
Ascidiacea -- 37
  • 26 (a)
-- 37
  • 28 (a)
-- 37
  • 28 (a)
-- 37
  • 23 (a)
CSA.10613 37
  • 20 (a)
Species with no ortholog for C1R:
  • A. gosspyii yeast (Ashbya gossypii)
  • Actinobacteria (Mycobacterium tuberculosis)
  • African clawed frog (Xenopus laevis)
  • African malaria mosquito (Anopheles gambiae)
  • Alicante grape (Vitis vinifera)
  • alpha proteobacteria (Wolbachia pipientis)
  • amoeba (Dictyostelium discoideum)
  • Archea (Pyrococcus horikoshii)
  • baker's yeast (Saccharomyces cerevisiae)
  • barley (Hordeum vulgare)
  • beta proteobacteria (Neisseria meningitidis)
  • bread mold (Neurospora crassa)
  • Chromalveolata (Phytophthora infestans)
  • common water flea (Daphnia pulex)
  • corn (Zea mays)
  • E. coli (Escherichia coli)
  • filamentous fungi (Aspergillus nidulans)
  • Firmicute bacteria (Streptococcus pneumoniae)
  • fission yeast (Schizosaccharomyces pombe)
  • fruit fly (Drosophila melanogaster)
  • green algae (Chlamydomonas reinhardtii)
  • honey bee (Apis mellifera)
  • K. lactis yeast (Kluyveromyces lactis)
  • loblloly pine (Pinus taeda)
  • malaria parasite (Plasmodium falciparum)
  • medicago trunc (Medicago Truncatula)
  • moss (Physcomitrella patens)
  • orangutan (Pongo pygmaeus)
  • pig (Sus scrofa)
  • rainbow trout (Oncorhynchus mykiss)
  • rice (Oryza sativa)
  • rice blast fungus (Magnaporthe grisea)
  • schistosome parasite (Schistosoma mansoni)
  • sea anemone (Nematostella vectensis)
  • sea urchin (Strongylocentrotus purpuratus)
  • sorghum (Sorghum bicolor)
  • soybean (Glycine max)
  • stem rust fungus (Puccinia graminis)
  • sugarcane (Saccharum officinarum)
  • thale cress (Arabidopsis thaliana)
  • tomato (Lycopersicon esculentum)
  • toxoplasmosis (Toxoplasma gondii)
  • Trichoplax (Trichoplax adhaerens)
  • wheat (Triticum aestivum)
  • worm (Caenorhabditis elegans)
  • zebrafish (Danio rerio)

Evolution for C1R Gene

Gene Tree for C1R (if available)
Gene Tree for C1R (if available)

Paralogs for C1R Gene

Paralogs for C1R Gene

genes like me logo Genes that share paralogs with C1R: view

Variants for C1R Gene

Polymorphic Variants from UniProtKB/Swiss-Prot for C1R Gene

Complement component C1r deficiency [MIM:216950] leads to the failure of the classical complement system activation pathway (C1 deficiency). Individuals with C1 deficiency are highly susceptible to infections by microorganisms and have greater risk in developing autoimmune diseases such as systemic lupus erythematosus (SLE)

Sequence variations from dbSNP and Humsavar for C1R Gene

SNP ID Clin Chr 12 pos Sequence Context AA Info Type MAF
VAR_016103 -
VAR_018667 -
VAR_018668 -
VAR_018669 -
VAR_018670 -

Relevant External Links for C1R Gene

HapMap Linkage Disequilibrium report
Human Gene Mutation Database (HGMD)

No data available for Structural Variations from Database of Genomic Variants (DGV) for C1R Gene

Disorders for C1R Gene

(1) OMIM Diseases for C1R Gene (613785)

(4) University of Copenhagen DISEASES for C1R Gene

(3) Novoseek inferred disease relationships for C1R Gene

Disease -log(P) Hits PubMed IDs
angioedema 40.5 1
lupus erythematosus systemic 17.1 2
alzheimers disease 10.9 1

Genatlas disease for C1R Gene

lupus systemic-like syndrome

Relevant External Links for C1R

Genetic Association Database (GAD)
Human Genome Epidemiology (HuGE) Navigator
genes like me logo Genes that share disorders with C1R: view

No data available for UniProtKB/Swiss-Prot for C1R Gene

Publications for C1R Gene

  1. The human complement component C1R gene: the exon-intron structure and the molecular basis of allelic diversity. (PMID: 12914573) Nakagawa M. … Umetsu K. (Ann. Hum. Genet. 2003) 3 4 23
  2. Interaction of C1q and mannan-binding lectin (MBL) with C1r, C1s, MBL-associated serine proteases 1 and 2, and the MBL-associated protein MAp19. (PMID: 10878362) Thiel S. … Jensenius J.C. (J. Immunol. 2000) 3 23
  3. Analysis of human C1q by combined bottom-up and top-down mass spectrometry: detailed mapping of post-translational modifications and insights into the C1r/C1s binding sites. (PMID: 20008834) Pflieger D. … Daniel R. (Mol. Cell Proteomics 2010) 3 23
  4. X-ray structure of the Ca2+-binding interaction domain of C1s. Insights into the assembly of the C1 complex of complement. (PMID: 12788922) Gregory L.A. … Gaboriaud C. (J. Biol. Chem. 2003) 3 23
  5. Identification of erythro-beta-hydroxyasparagine in the EGF-like domain of human C1r. (PMID: 2820791) Arlaud G.J. … Gagnon J. (FEBS Lett. 1987) 3 4

Products for C1R Gene

Sources for C1R Gene

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