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- W2017452404 abstract "Abstract Tightly associated factor Va (FVa) and factor Xa (FXa) serve as the essential prothrombin-activating complex that assembles on phosphatidylserine (PS)–containing platelet membranes during blood coagulation. We have previously shown that (1) a soluble form of PS (C6PS) triggers assembly of a fully active FVa-FXa complex in solution and (2) that 2 molecules of C6PS bind to FVa light chain with one occupying a site in the C2 domain. We expressed human factor Va (rFVa) with mutations in either the C1 domain (Y1956,L1957)A, the C2 domain (W2063,W2064)A, or both C domains (Y1956,L1957,W2063,W2064)A. Mutations in the C1 and C1-C2 domains of rFVa reduced the rate of activation of prothrombin to thrombin by FXa in the presence of 400 μM C6PS by 14 000- to 15 000-fold relative to either wild-type or C2 mutant factor rFVa. The Kd's of FXa binding with rFVa (wild-type, C2 mutant, C1 mutant, and C1-C2 mutant) were 3, 4, 564, and 624 nM, respectively. Equilibrium dialysis experiments detected binding of 4, 3, and 2 molecules of C6PS to wild-type rFVa, C1-mutated, and C1,C2-mutated rFVa, respectively. Because FVa heavy chain binds 2 molecules of C6PS, we conclude that both C2 and C1 domains bind one C6PS, with binding to the C1 domain regulating prothrombinase complex assembly." @default.
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- W2017452404 date "2008-10-01" @default.
- W2017452404 modified "2023-10-16" @default.
- W2017452404 title "A phosphatidylserine binding site in factor Va C1 domain regulates both assembly and activity of the prothrombinase complex" @default.
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- W2017452404 doi "https://doi.org/10.1182/blood-2008-02-138941" @default.
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