A serum protein that regulates the CLASSICAL COMPLEMENT ACTIVATION PATHWAY. It binds as a cofactor to COMPLEMENT FACTOR I which then hydrolyzes the COMPLEMENT C4B in the CLASSICAL PATHWAY C3 CONVERTASE (C4bC2a).
Also Known As:
C4b-Binding Protein; C4b-C3b Inactivator Cofactor; C4bC3bINA-Cofactor; Complement 4b Binding Protein; Complement C3b-C4b Inactivator Cofactor; Complement Component 4b-Binding Protein; C4b Binding Protein; C4b C3b Inactivator Cofactor; C4b-Binding Protein, Complement; C4bC3bINA Cofactor; Cofactor, C4b-C3b Inactivator; Complement C3b C4b Inactivator Cofactor; Complement C4b Binding Protein; Complement Component 4b Binding Protein; Protein, C4b-Binding; Protein, Complement C4b-Binding