Energetics of thrombin-thrombomodulin interaction

Biochemistry
A VindigniE Di Cera

Abstract

Temperature and salt dependence studies of thrombin interaction with thrombomodulin, with and without chondroitin sulfate, and two fragments containing the EGF-like domains 4-5 and 4-5-6 reveal the energetic signatures and the mechanism of recognition of this physiologically important cofactor. Binding of thrombomodulin is affected drastically by the particular salt present in solution and is positively linked to Na+ binding to thrombin and the conversion of the enzyme from the slow to the fast form, but is opposed by Cl- binding to the fibrinogen recognition site and especially to the heparin binding site. Binding of thrombomodulin has an unusually large salt dependence (gamma(salt) = -4.8) contributed mostly by the polyelectrolyte-like nature of the chondroitin sulfate moiety that binds to the heparin binding site and increases the affinity of the cofactor by almost 10-fold. On the other hand, the chondroitin sulfate has no effect on the deltaCp of binding, which is determined predominantly by contacts made by the EGF-like domains 5 and 6 with the fibrinogen recognition site. The modest heat capacity change (-0.2 kcal mol(-1) K(-1)) observed when thrombomodulin binds to the fast form suggests a rigid-body association of the c...Continue Reading

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