SERPING1

Serine protease inhibitor, which acrs as a regulator of the classical complement pathway. Forms a proteolytically inactive stoichiometric complex with the C1r or C1s proteases. May also regulate blood coagulation, fibrinolysis and the generation of kinins. Very efficient inhibitor of FXIIa. Inhibits chymotrypsin and kallikrein..

Function from UniProtKB (P05155), read 2026-09-23. CC BY 4.0.