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• W1992050687 abstract "The thrombin inhibitor, bothrojaracin [Zingali, R. B., Jandrot-Perrus, M., Guillin, M. C., & Bon, C. (1993) Biochemistry 32, 10794−10802], is a 27 kDa protein isolated from the venom of Bothrops jararaca that blocks several thrombin functions, including fibrinogen clotting, platelet activation, and fibrin and thrombomodulin binding, but does not interact with the catalytic site. In the present report, we show that the high affinity binding of α-thrombin to immobilized bothrojaracin (Kd = 0.6 nM) is inhibited by the C-terminal peptide of hirudin and that the γ-cleavage within exosite 1 reduces the affinity of bothrojaracin for thrombin (Kd = 0.3 μM), indicating that bothrojaracin binding to exosite 1 is a major determinant of the thrombin−bothrojaracin interaction. In addition, we show that bothrojaracin decreases the rate of inhibition of α- and γ-thrombin by the antithrombin III−heparin complex. Competition of bothrojaracin with heparin or prothrombin fragment 2 for binding to thrombin indicates that bothrojaracin not only binds exosite 1 but also binds exosite 2 or in close proximity. Bothrojaracin binds to the thrombin precursor, prothrombin. This interaction is calcium-independent and is prevented by heparin, suggesting that it is mediated by exosite 2. Bothrojaracin inhibits platelet activation induced by clot-bound thrombin and slowly dissociates thrombin from the fibrin clots. Altogether, our results indicate that the high affinity of bothrojaracin for thrombin is supported by a double-site interaction and results in an efficient inhibition of both soluble and clot-bound thrombin." @default.
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• W1992050687 date "1996-01-01" @default.
• W1992050687 modified "2023-10-14" @default.
• W1992050687 title "Bothrojaracin: A Potent Two-Site-Directed Thrombin Inhibitor" @default.
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• W1992050687 doi "https://doi.org/10.1021/bi960043l" @default.
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