Open Access
Allosteric activation of coagulation factor VIIa
Egon Persson1,Ole Hvilsted Olsen1
Haemostasis Biochemistry, Novo Nordisk A/S, Novo Nordisk Park, DK-2760 Maaloev, Denmark.
DOI: 10.2741/3903 Volume 16 Issue 8, pp.3156-3163
Published: 01 June 2011

Coagulation factor VIIa (FVIIa) is present at subnanomolar concentration and represents a small percentage of the total amount of FVII in the circulation. FVIIa is poised to initiate blood clotting when it encounters its pivotal cofactor tissue factor (TF) which becomes exposed to blood upon vascular rupture. The requirement for complex formation with TF in order for FVIIa to express procoagulant activity ensures thrombin and fibrin generation at the right time and place. Thus TF acts as a guardian of safety of paramount importance to blood coagulation by providing localization to the site of injury and at the same time inducing maturation of zymogen-like free FVIIa to the active cofactor-bound enzyme. This review gives an account of the accumulated knowledge about the structure, function and TF dependence of FVIIa to arrive at a plausible allosteric mechanism by which TF induces maturation of the active conformation of FVIIa.

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Egon Persson, Ole Hvilsted Olsen. Allosteric activation of coagulation factor VIIa. Frontiers in Bioscience-Landmark. 2011. 16(8); 3156-3163.