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Related Experiment Videos

Interaction of prothrombin with factor Va-phospholipid complexes.

P van de Waart, H C Hemker, T Lindhout

    Biochemistry
    |June 5, 1984
    PubMed
    Summary

    Factor Va significantly enhances the binding of prothrombin, factor X, and factor Xa to phospholipids. However, the factor Va light chain alone does not mediate these interactions, suggesting a competitive binding mechanism.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Hemostasis

    Background:

    • Factor Va is a critical cofactor in the coagulation cascade, assembling the prothrombinase complex on phospholipid surfaces.
    • Understanding the precise molecular interactions of Factor Va with coagulation factors and phospholipids is essential for elucidating hemostasis regulation.

    Purpose of the Study:

    • To investigate the role of Factor Va and its phospholipid-binding fragment (Factor Va light chain) in the binding of prothrombin, Factor X, and Factor Xa to phospholipid vesicles.
    • To determine the stoichiometry and binding characteristics of these interactions.

    Main Methods:

    • Equilibrium binding experiments using large-volume phospholipid vesicles amenable to centrifugation.
    • Quantification of protein binding to vesicles in the presence and absence of Factor Va and its light chain.

    Main Results:

    • Factor Va significantly decreased the dissociation constants for prothrombin, Factor X, and Factor Xa binding to phospholipids, indicating enhanced affinity.
    • A 1:1 stoichiometric complex was observed between phospholipid-bound Factor Va and each of prothrombin, Factor X, or Factor Xa.
    • Factor Va light chain increased dissociation constants for Factor Xa and prothrombin binding, suggesting competitive interactions at the phospholipid surface.

    Conclusions:

    • Factor Va acts as a potent enhancer for the assembly of the prothrombinase complex by increasing the affinity of its components for phospholipid surfaces.
    • The phospholipid-binding fragment of Factor Va (light chain) alone does not mediate the binding of Factor Xa and prothrombin to Factor Va, indicating that other domains of Factor Va are involved in these interactions.

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