Vitamin K-Dependent Protein S (PROS1) Antibody – Rabbit Polyclonal

This gene encodes a vitamin K-dependent plasma protein that functions as a cofactor for the anticoagulant protease, activated protein C (APC) to inhibit blood coagulation. It is found in plasma in both a free, functionally active form and also in an inactive form complexed with C4b-binding protein. Mutations in this gene result in autosomal dominant hereditary thrombophilia. An inactive pseudogene of this locus is located at an adjacent region on chromosome 3. [provided by RefSeq, Feb 2009]

Function: Anticoagulant plasma protein; it is a cofactor to activated protein C in the degradation of coagulation factors Va and VIIIa. It helps to prevent coagulation and stimulating fibrinolysis.

Subcellular location: Secreted.

Tissue specificity: Plasma.

Post-translational modification: The iron and 2-oxoglutarate dependent 3-hydroxylation of aspartate and asparagine is (R) stereospecific within EGF domains

By similarity.

Involvement in disease: Thrombophilia due to protein S deficiency, autosomal dominant (THPH5) [MIM:612336]: A hemostatic disorder characterized by impaired regulation of blood coagulation and a tendency to recurrent venous thrombosis. Based on the plasma levels of total and free PROS1 as well as the serine protease-activated protein C cofactor activity, three types of THPH5 have been described: type I, characterized by reduced total and free PROS1 levels together with reduced anticoagulant activity; type III, in which only free PROS1 antigen and PROS1 activity levels are reduced; and the rare type II which is characterized by normal concentrations of both total and free PROS1 antigen, but low cofactor activity.Note: The disease is caused by mutations affecting the gene represented in this entry. Ref.10 Ref.14 Ref.15 Ref.16 Ref.17 Ref.18 Ref.19 Ref.20 Ref.21 Ref.22 Ref.23 Ref.24 Ref.25 Ref.26 Ref.27 Ref.28 Ref.29 Ref.30 Ref.31 Ref.32 Ref.33 Ref.34 Ref.35 Ref.36 Ref.37 Ref.38Thrombophilia due to protein S deficiency, autosomal recessive (THPH6) [MIM:614514]: A very rare and severe hematologic disorder resulting in thrombosis and secondary hemorrhage usually beginning in early infancy. Some affected individuals develop neonatal purpura fulminans, multifocal thrombosis, or intracranial hemorrhage.Note: The disease is caused by mutations affecting the gene represented in this entry.

Sequence similarities: Contains 4 EGF-like domains.Contains 1 Gla (gamma-carboxy-glutamate) domain.Contains 2 laminin G-like domains.

Sequence caution: The sequence AAP45054.1 differs from that shown. Reason: Erroneous gene model prediction.