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Domains specifying thrombin–receptor interaction

Abstract

PLATELET activation by the coagulation protease thrombin is central to arterial thrombosis, a major cause of morbidity and mortality. We recently isolated a complementary DNA encoding the platelet thrombin receptor. The extracellular amino-terminal extension of this seven transmembrane domain receptor contains the putative thrombin cleavage site LDPR/S which is critical for receptor activation. By replacing this cleavage site with the cleavage site for enterokinase, we have created a functional enterokinase receptor. This result demonstrates that all information necessary for receptor activation is provided by receptor proteolysis. Nanomolar enterokinase concentrations are required to activate this new receptor, in contrast to the picomolar thrombin concentrations that activate wild-type thrombin receptor. We identified a receptor domain critical for thrombin's remarkable potency at its receptor. This domain resembles the carboxyl tail of the leech anticoagulant hirudin and functions by binding to thrombin's anion-binding exosite. Our studies thus define a model for thrombin–receptor interaction. The utility of this model was demonstrated by the design of novel thrombin inhibitors based on receptor peptides.

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Vu, TK., Wheaton, V., Hung, D. et al. Domains specifying thrombin–receptor interaction. Nature 353, 674–677 (1991). https://doi.org/10.1038/353674a0

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