FUNCTION Appears to assist hemostasis by binding thrombin and promoting its association with phospholipid vesicles. Inhibits activity of the coagulation protease factor Xa in the presence of SERPINA10, calcium and phospholipids.SUBUNIT Interacts with SERPINA10.INTERACTION Plasma.PTM The iron and 2-oxoglutarate dependent 3-hydroxylation of aspartate and asparagine is (R) stereospecific within EGF domains.SIMILARITY Belongs to the peptidase S1 family.CAUTION Although related to peptidase S1 family vitamin K-dependent clotting factors, it has lost two of the essential catalytic residues and therefore lacks protease activity.
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