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Kinetics of human factor VII activation

S Butenas1, K G Mann

  • 1Department of Biochemistry, University of Vermont, Burlington 05405, USA.

Biochemistry
|February 13, 1996
PubMed
Summary

Membrane-bound factor Xa is the most likely physiological activator of factor VII, with activation rates dependent on anionic phospholipid concentrations. Other activators like thrombin and factor IXa showed no significant factor VII activation.

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Area of Science:

  • Biochemistry
  • Hematology
  • Molecular Biology

Background:

  • Factor VII is a crucial zymogen in the extrinsic coagulation pathway.
  • Understanding its activation mechanism is vital for hemostasis research.

Purpose of the Study:

  • To evaluate the activation of human factor VII by various activators.
  • To investigate the role of anionic phospholipids in factor VII activation.

Main Methods:

  • Assessed factor VII activation rates using different activators (factor Xa, factor VIIa-tissue factor complex, thrombin, factor IXa).
  • Studied the effect of mixed phospholipid vesicles (phosphatidylserine/phosphatidylcholine) on activation kinetics.
  • Determined Michaelis-Menten constants (KM) and catalytic constants (kcat).

Main Results:

  • Factor Xa-mediated factor VII activation is highly dependent on anionic phospholipid (PCPS) concentration, with optimal rates at 5-20 microM.
  • The factor VIIa-tissue factor complex also activates factor VII, but at a lower rate than factor Xa.
  • Thrombin and factor IXa did not significantly activate factor VII under the tested conditions.
  • Factor Xa-PCPS exhibited the highest catalytic efficiency (kcat = 15.2 s-1).

Conclusions:

  • Membrane-bound factor Xa is identified as the most probable physiological activator of factor VII.
  • Phospholipid composition significantly influences the kinetics of factor VII activation.

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