Molecular cloning of rat C4b binding protein alpha- and beta-chains : structural and functional relationships among human, bovine, rabbit, mouse, and rat proteins
The C4b binding protein (C4BP) functions as a regulator of the complement system by interacting with the activated form of the fourth complement component, C4b. Human C4BP also interacts with the anticoagulant protein S and the serum amyloid P component (SAP). It is composed of seven identical 70-kDa alpha-chains and one 45-kDa beta-chain. The alpha-chain contains a binding site for C4b, whereas t
