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Related Experiment Videos

The factor V activation paradox.

Thomas Orfeo1, Nicole Brufatto, Michael E Nesheim

  • 1Department of Biochemistry, University of Vermont, 89 Beaumont Avenue, Burlington, VT 05405-0068, USA.

The Journal of Biological Chemistry
|February 26, 2004
PubMed
Summary
This summary is machine-generated.

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The formation of factor Va, crucial for blood clotting, is primarily initiated by alpha-thrombin, amplified by meizothrombin, and not significantly driven by factor Xa alone.

Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • The prothrombinase complex, essential for blood coagulation, involves factor Xa, Ca2+, and factor Va.
  • Factor Va significantly enhances the catalytic efficiency of factor Xa in converting prothrombin to thrombin.
  • The precise catalytic sequence for activating factor V to factor Va remains debated.

Purpose of the Study:

  • To elucidate the reaction pathways and kinetics of factor V activation.
  • To determine the roles of thrombin and factor Xa in factor Va formation.
  • To clarify the mechanism of factor Va generation in blood coagulation.

Main Methods:

  • Biophysical and biochemical assays to determine rate constants.
  • Kinetic analysis of factor V activation by various proteases.

Related Experiment Videos

  • Numerical simulations of coagulation pathways.

    • Main Results:

    • Thrombin, particularly alpha-thrombin, initiates factor V activation.
    • Meizothrombin significantly amplifies factor V activation, playing a key procoagulant role.
    • Direct activation of factor V by factor Xa is not a major pathway at physiological concentrations.

    Conclusions:

    • Factor Va formation is initiated by alpha-thrombin and amplified by meizothrombin.
    • This pathway highlights a crucial amplification loop in blood coagulation.
    • Understanding factor Va formation is key to comprehending hemostasis and thrombosis.