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Description

Native, human C4 complement component. Glycoprotein composed of three non-identical subunits of M.W. of 93 kDa (alpha), 75 kDa (beta), and 32 kDa (gamma) linked by disulfide bonds. Present in normal human serum at 400 µ,g/ml. On activation of complement via the classical pathway, the C1s subcomponent of the C1 complex is converted to an active serine protease that cleaves the C4 alpha-chain at peptide bond 77, resulting in production of C4a (M.W. 8740) and C4b fragments (M.W. 193 kDa). The released C4a peptide is one of the three complement-derived anaphylatoxins. The nascent C4b fragment can form a covalent ester bond with target surfaces. This covalent attachment of C4b to target acceptors is required for continuation of activation via classical pathway., Native, human C4 complement component. Glycoprotein composed of three non-identical subunits of M.W. 93,000 (alpha), 75,000 (beta), and 32,000 (gamma) linked by disulfide bonds. Present in normal human serum at 400 µ,g/ml. On activation of complement via the classical pathway, the C1s subcomponent of the C1 complex is converted to an active serine protease that cleaves the C4 alpha-chain at peptide bond 77, resulting in the production of C4a (M.W. 8740) and C4b fragments (M.W. 193,000). The released C4a peptide is one of the three complement-derived anaphylatoxins. The nascent C4b fragment can form a covalent ester bond with target surfaces. This covalent attachment of C4b to target acceptors is required for continuation of activation via classical pathway.