ID   3.4.21.45
DE   complement factor I.
AN   C3b/C4b inactivator.
AN   C3b inactivator.
AN   complement component C3b inactivator.
CA   Inactivates complement subcomponents C3b, iC3b and C4b by proteolytic
CA   cleavage.
CC   -!- Cleavage of complement subcomponent C3b requires its binding to
CC       cofactor H or complement receptor CR1; cleavage of iC3b requires
CC       complement receptor CR1; cleavage of C4b requires C4b-binding
CC       protein.
CC   -!- Belongs to peptidase family S1.
DR   P05156, CFAI_HUMAN ;  Q61129, CFAI_MOUSE ;  Q5R5A4, CFAI_PONAB ;
DR   Q9WUW3, CFAI_RAT   ;
//