Factor Xa Activation of Factor V Is of Paramount Importance in Initiating the Coagulation System
نویسندگان
چکیده
منابع مشابه
Factor Xa activation of factor V is of paramount importance in initiating the coagulation system: lessons from a tick salivary protein.
BACKGROUND Generation of active procoagulant cofactor factor Va (FVa) and its subsequent association with the enzyme activated factor X (FXa) to form the prothrombinase complex is a pivotal initial event in blood coagulation and has been the subject of investigative effort, speculation, and controversy. The current paradigm assumes that FV activation is initiated by limited proteolysis by trace...
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15 صفحه اولCleavage requirements for activation of factor V by factor Xa.
Coagulation factor V circulates in plasma as a single chain protein which expresses little procoagulant activity. After its activation by limited proteolysis by thrombin or factor Xa, factor Va functions as cofactor to factor Xa in the activation of prothrombin. Thrombin cleaves human factor V at Arg709, Arg1018 and Arg1545 and factor Va is formed by the heavy and light chains, which correspond...
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Activated protein C (APC) cleavage of Factor Va (FVa) at residues R506 and R306 correlates with its inactivation. APC resistance and increased thrombotic risk are due to the mutation R506Q in Factor V (FV). To study the effects of individual cleavages in FVa by APC and the importance of regions near the cleavage sites, the following recombinant (r) human FVs were prepared and purified: wild-typ...
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Cell signaling by coagulation factor Xa (Xa) contributes to pro-inflammatory responses in vivo. This study characterizes the signaling mechanism of Xa in a HeLa cell line that expresses protease-activated receptor 1 (PAR-1) but not PAR-2, -3, or -4. Xa induced NF-kappaB in HeLa cells efficiently but with delayed kinetics compared to thrombin. This delay caused no difference in gene expression p...
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ژورنال
عنوان ژورنال: Circulation
سال: 2013
ISSN: 0009-7322,1524-4539
DOI: 10.1161/circulationaha.113.003191