Abstract
Factor XI (FXI) binds specifically and reversibly to high affinity sites on the surface of stimulated platelets (Kd app of approximately 10 nm; Bmax of approximately 1,500 sites/platelet) utilizing residues exposed on the Apple 3 domain in the presence of high molecular weight kininogen and Zn2+ or prothrombin and Ca2+. Because the FXI receptor in the platelet membrane is contained within the glycoprotein Ibalpha subunit of the glycoprotein Ib-IX-V complex (Baglia, F. A., Badellino, K. O., Li, C. Q., Lopez, J. A., and Walsh, P. N. (2002) J. Biol. Chem. 277, 1662-1668), we utilized mocarhagin, a cobra venom metalloproteinase, to generate a fragment (His1-Glu282) of glycoprotein Ibalpha that contains the leucine-rich repeats of the NH2-terminal globular domain and excludes the macroglycopeptide portion of glycocalicin, the soluble extracytoplasmic portion of glycoprotein Ibalpha. This fragment was able to compete with FXI for binding to activated platelets (Ki of 3.125 +/- 0.25 nm) with a potency similar to that of intact glycocalicin (Ki of 3.72 +/- 0.30 nm). However, a synthetic glycoprotein Ibalpha peptide, Asp269-Asp287, containing a thrombin binding site had no effect on the binding of FXI to activated platelets. Moreover, t...Continue Reading
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