Complement component 1r

Complement C1r subcomponent (EC 3.4.21.41, activated complement C1r, C overbar 1r esterase, C1r) is a protein involved in the complement system of the innate immune system. In humans, C1r is encoded by the C1R gene.

C1R
Available structures PDB Ortholog search: PDBe RCSB List of PDB id codes 1APQ, 1GPZ, 1MD7, 1MD8, 2QY0
Identifiers
Aliases	C1R, complement C1r, EDSPD1
External IDs	OMIM: 613785; MGI: 3779804; HomoloGene: 1313; GeneCards: C1R; OMA:C1R - orthologs
Gene location (Human) Chr. Chromosome 12 (human) Band 12p13.31 Start 7,080,214 bp End 7,092,540 bp
Gene location (Mouse) Chr. Chromosome 6 (mouse) Band 6 F2|6 Start 124,547,253 bp End 124,558,130 bp
RNA expression pattern Bgee Human Mouse (ortholog) Top expressed in right lobe of liver right ovary gallbladder right coronary artery gastric mucosa left ovary left uterine tube left coronary artery urinary bladder canal of the cervix Top expressed in white adipose tissue adrenal gland muscle of thigh urinary bladder dentate gyrus of hippocampal formation granule cell liver ovary skeletal muscle tissue spleen islet of Langerhans More reference expression data BioGPS n/a
Gene ontology Molecular function peptidase activity serine-type peptidase activity serine-type endopeptidase activity protein binding hydrolase activity calcium ion binding Cellular component extracellular region blood microparticle extracellular exosome extracellular space Biological process immune response proteolysis complement activation, classical pathway immune system process innate immune response complement activation regulation of complement activation zymogen activation Sources:Amigo / QuickGO
Orthologs Species Human Mouse Entrez 715 667277 Ensembl ENSG00000159403 ENSG00000288512 ENSMUSG00000098470 UniProt P00736 Q8CFG9 RefSeq (mRNA) NM_001733 NM_001354346 NM_001113356 RefSeq (protein) NP_001724 NP_001341275 NP_001106827 Location (UCSC) Chr 12: 7.08 – 7.09 Mb Chr 6: 124.55 – 124.56 Mb PubMed search
Wikidata
View/Edit Human View/Edit Mouse

C1r along with C1q and C1s form the C1 complex, which is the first component of the serum complement system. C1r is an enzyme that activates C1s to its active form, by proteolytic cleavage.

Clinical significance

• Ehlers–Danlos syndrome Periodontal type is associated with mutations in the CR1 gene

Function

C1r has been shown to interact with C1s. C1r cleaves C1s to form the active form of C1s.

Further reading

• Lee SL, Wallace SL, Barone R, Blum L, Chase PH (1979). "Familial deficiency of two subunits of the first component of complement. C1r and C1s associated with a lupus erythematosus-like disease". Arthritis and Rheumatism. 21 (8): 958–67. doi:10.1002/art.1780210813. PMID 737019.
• Ward SL, Ingham KC (January 1992). "A calcium-binding monoclonal antibody that recognizes a non-calcium-binding epitope in the short consensus repeat units (SCRs) of complement C1r". Molecular Immunology. 29 (1): 83–93. doi:10.1016/0161-5890(92)90160-Y. PMID 1370572.
• Luo C, Thielens NM, Gagnon J, Gal P, Sarvari M, Tseng Y, Tosi M, Zavodszky P, Arlaud GJ, Schumaker VN (May 1992). "Recombinant human complement subcomponent C1s lacking beta-hydroxyasparagine, sialic acid, and one of its two carbohydrate chains still reassembles with C1q and C1r to form a functional C1 complex". Biochemistry. 31 (17): 4254–62. doi:10.1021/bi00132a015. PMID 1533159.
• Busby TF, Ingham KC (May 1990). "NH2-terminal calcium-binding domain of human complement C1s- mediates the interaction of C1r- with C1q". Biochemistry. 29 (19): 4613–8. doi:10.1021/bi00471a016. PMID 2372546.
• Lyons LA, Kamboh MI, Ferrell RE (1989). "Genetic studies of low-abundance human plasma proteins. XI. Linkage analysis and population genetics of the C1S subcomponent of the first complement component". Complement and Inflammation. 6 (2): 81–7. doi:10.1159/000463078. PMID 2541966.
• Arlaud GJ, Van Dorsselaer A, Bell A, Mancini M, Aude C, Gagnon J (September 1987). "Identification of erythro-beta-hydroxyasparagine in the EGF-like domain of human C1r". FEBS Letters. 222 (1): 129–34. Bibcode:1987FEBSL.222..129A. doi:10.1016/0014-5793(87)80205-3. PMID 2820791. S2CID 36194093.
• Nguyen VC, Tosi M, Gross MS, Cohen-Haguenauer O, Jegou-Foubert C, de Tand MF, Meo T, Frézal J (April 1988). "Assignment of the complement serine protease genes C1r and C1s to chromosome 12 region 12p13". Human Genetics. 78 (4): 363–8. doi:10.1007/BF00291737. PMID 2834284. S2CID 30582112.
• Leytus SP, Kurachi K, Sakariassen KS, Davie EW (August 1986). "Nucleotide sequence of the cDNA coding for human complement C1r". Biochemistry. 25 (17): 4855–63. doi:10.1021/bi00365a020. PMID 3021205.
• Journet A, Tosi M (December 1986). "Cloning and sequencing of full-length cDNA encoding the precursor of human complement component C1r". The Biochemical Journal. 240 (3): 783–7. doi:10.1042/bj2400783. PMC 1147487. PMID 3030286.
• Arlaud GJ, Willis AC, Gagnon J (February 1987). "Complete amino acid sequence of the A chain of human complement-classical-pathway enzyme C1r". The Biochemical Journal. 241 (3): 711–20. doi:10.1042/bj2410711. PMC 1147622. PMID 3036070.
• Chesne S, Villiers CL, Arlaud GJ, Lacroix MB, Colomb MG (January 1982). "Fluid-phase interaction of C1 inhibitor (C1 Inh) and the subcomponents C1r and C1s of the first component of complement, C1". The Biochemical Journal. 201 (1): 61–70. doi:10.1042/bj2010061. PMC 1163609. PMID 6282262.
• Arlaud GJ, Gagnon J (April 1983). "Complete amino acid sequence of the catalytic chain of human complement subcomponent C1-r". Biochemistry. 22 (8): 1758–64. doi:10.1021/bi00277a003. PMID 6303394.
• Maruyama K, Sugano S (January 1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID 8125298.
• Nöthen MM, Dewald G (January 1994). "A common amino acid polymorphism in complement component C1R". Human Molecular Genetics. 3 (1): 217. doi:10.1093/hmg/3.1.217-a. PMID 8162045.
• Gasque P, Ischenko A, Legoedec J, Mauger C, Schouft MT, Fontaine M (November 1993). "Expression of the complement classical pathway by human glioma in culture. A model for complement expression by nerve cells". The Journal of Biological Chemistry. 268 (33): 25068–74. doi:10.1016/S0021-9258(19)74572-4. PMID 8227070.
• Pelloux S, Thielens NM, Hudry-Clergeon G, Pétillot Y, Filhol O, Arlaud GJ (May 1996). "Identification of a cryptic protein kinase CK2 phosphorylation site in human complement protease Clr, and its use to probe intramolecular interaction". FEBS Letters. 386 (1): 15–20. Bibcode:1996FEBSL.386...15P. doi:10.1016/0014-5793(96)00403-6. PMID 8635594. S2CID 28372780.
• Bradley K, North J, Saunders D, Schwaeble W, Jeziorska M, Woolley DE, Whaley K (August 1996). "Synthesis of classical pathway complement components by chondrocytes". Immunology. 88 (4): 648–56. PMC 1456645. PMID 8881771.
• Lacroix M, Rossi V, Gaboriaud C, Chevallier S, Jaquinod M, Thielens NM, Gagnon J, Arlaud GJ (May 1997). "Structure and assembly of the catalytic region of human complement protease C1r: a three-dimensional model based on chemical cross-linking and homology modeling". Biochemistry. 36 (21): 6270–82. doi:10.1021/bi962719i. PMID 9174342.
• Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (October 1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID 9373149.
• Bersch B, Hernandez JF, Marion D, Arlaud GJ (February 1998). "Solution structure of the epidermal growth factor (EGF)-like module of human complement protease C1r, an atypical member of the EGF family". Biochemistry. 37 (5): 1204–14. doi:10.1021/bi971851v. PMID 9477945.

External links

• Human C1R genome location and C1R gene details page in the UCSC Genome Browser.
• Complement+C1r at the U.S. National Library of Medicine Medical Subject Headings (MeSH)