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. 1988 May;81(5):1470–1475. doi: 10.1172/JCI113478

Structure of platelet glycoprotein IIIa. A common subunit for two different membrane receptors.

A B Zimrin 1, R Eisman 1, G Vilaire 1, E Schwartz 1, J S Bennett 1, M Poncz 1
PMCID: PMC442579  PMID: 2452834

Abstract

The platelet membrane glycoprotein IIb/IIIa complex is a member of a family of alpha/beta heterodimers that function as receptors for adhesive proteins. In this report we describe the structure of the human beta subunit GPIIIa deduced from an analysis of 4.0 kb of overlapping cDNA sequences isolated from a human erythroleukemia (HEL) cell cDNA expression library. A continuous open reading frame encoding all 788 amino acids for GPIIIa was present. The deduced amino acid sequence included a 26-residue amino-terminal signal peptide, a 29-residue transmembrane domain near the carboxy terminus, and four tandemly repeated cysteine-rich domains of 33-38 residues. An exact correspondence of 128 amino acids from seven human platelet GPIIIa fragments with HEL GPIIIa indicates that HEL and platelet GPIIIa are the same gene product. The HEL GPIIIa sequence was compared with the sequences of the beta subunit for the human LFA-1/Mac-1/p150.95 complex and human endothelial cell GPIIIa, revealing a 38% similarity with the former and virtual identity with the latter. Northern blot analysis using RNA from both HEL and endothelial cells revealed two GPIIIa transcripts of 5.9 and 4.1 kb. However, HEL RNA, but not endothelial cell RNA, contained a transcript for GPIIb. This indicates that the GPIIIa-containing heterodimers in platelets and endothelial cells are not identical structures, but are members of a subfamily within the human family of adhesion protein receptors sharing an identical beta subunit.

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Selected References

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