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.[5][6][7] In humans, C1r is encoded by the C1R gene.[8]
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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.
C1r has been shown to interact with C1s. C1r cleaves C1s to form the active form of C1s.[9][10]
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- 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.
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- 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.
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