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DOI: 10.1055/s-0038-1646411
Effect of the Hirudin Carboxy-Terminal Peptide 54-65 on the Interaction of Thrombin with Platelets
Publikationsverlauf
Received 18. Dezember 1990
Accepted 04. März 1991
Publikationsdatum:
25. Juli 2018 (online)
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Summary
The carboxy-terminal region of hirudin (residues 54-65) has previously been shown to inhibit thrombin clotting activity without binding to the catalytic site of the enzyme. In the present study, the effect of hirudin 54-65 on thrombin interaction with specified platelet proteins has been investigated. Hirudin 54-65 was found to inhibit thrombin-induced platelet aggregation and secretion in a dose-dependent manner. Substitution of either Phe56, Glu57, Ile59, Pro60 or Leu64 showed that these residues were critical for inhibition of thrombin-induced platelet activation whereas sulfation of Tyr63 increased the inhibitory potency of the peptide. Hydrolysis of glycoprotein V, a platelet membrane substrate for thrombin, was only partially inhibited by hirudin 54-65. Although hirudin 54-65 did not decrease the amount of thrombin bound to platelets during cross-linking experiments, it was found to inhibit the specific binding of thrombin to platelet glycoprotein Ib. Since the carboxy-terminal region of hirudin has previously been reported to bind near the trypsin-catalyzed β cleavage site, we have analyzed the consequences of a to β-thrombin conversion on both thrombin-hirudin 54-65 interaction and thrombin activity toward platelets. The β cleavage induced a decrease in the affinity of thrombin for both glycoprotein Ib and hirudin 54-65. Altogether, our results indicate that thrombin recognition sites for hirudin 54-65 and platelet membrane glycoprotein Ib share common structures located near the β cleavage site at Arg 73 on the thrombin B chain.
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