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. 1993 Sep 15;90(18):8327–8331. doi: 10.1073/pnas.90.18.8327

Human platelet glycoprotein V: characterization of the polypeptide and the related Ib-V-IX receptor system of adhesive, leucine-rich glycoproteins.

M J Hickey 1, F S Hagen 1, M Yagi 1, G J Roth 1
PMCID: PMC47349  PMID: 7690959

Abstract

Human platelet glycoprotein (GP) V (M(r) 83,300), whose primary structure is reported here, is a part of the Ib-V-IX system of surface glycoproteins (GPs Ib alpha, Ib beta, V, IX) that constitute the receptor for von Willebrand factor (vWf) and mediate the adhesion of platelets to injured vascular surfaces in the arterial circulation, a critical initiating event in hemostasis. System members share physical associations, leucine-rich glycoprotein (LRG) structures, and a congenital deficiency state, Bernard-Soulier syndrome. With PCR techniques and platelet cDNA templates, 1.4 kb of GP V cDNA sequence was obtained that encodes 469 GP V amino acids. A genomic 3.5-kb BamHI fragment was then isolated that includes 3.46 kb of GP V cDNA sequence: the 1.7-kb open reading frame plus 2 bases of the 5' and 1.8 kb of the 3' untranslated regions. Northern blot analysis reveals three GP V platelet transcripts of 3.8, 4.2, and 5.2 kb. A 16-amino acid signal peptide is present. Mature GP V is a 544-amino acid transmembrane protein with a 504-amino acid extracellular domain that encompasses a set of 15 tandem LRG repeats in a "flank-LRG center-flank" array [Roth, G. J. (1991) Blood 77, 5-19] along with eight putative N-linked glycosylation sites and cleavage sites for thrombin and calpain. GP V is a transmembrane, adhesive LRG protein that plays an undefined, but potentially critical, role in the expression and/or function of the Ib-V-IX receptor for vWf/shear-dependent platelet adhesion in arteries.

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Selected References

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