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Comparison of cDNA-derived protein sequences of the human fibronectin and vitronectin receptor alpha-subunits and platelet glycoprotein IIb.

Abstract：

:The fibronectin receptor (FnR), the vitronectin receptor (VnR), and the platelet membrane glycoprotein (GP) IIb-IIIa complex are members of a family of cell adhesion receptors, which consist of noncovalently associated alpha- and beta-subunits. The present study was designed to compare the cDNA-derived protein sequences of the alpha-subunits of human FnR, VnR, and platelet GP IIb. cDNA clones for the alpha-subunit of the FnR (FnR alpha) were obtained from a human umbilical vein endothelial (HUVE) cell library by using an oligonucleotide probe designed from a peptide sequence of platelet GP IIb. cDNA clones for platelet GP IIb were isolated from a cDNA expression library of human erythroleukemia cells by using antibodies. cDNA clones of the VnR alpha-subunit (VnR alpha) were obtained from the HUVE cell library by using an oligonucleotide probe from the partial cDNA sequence for the VnR alpha. Translation of these sequences showed that the FNR alpha, the VnR alpha, and GP IIb are composed of disulfide-linked large (858-871 amino acids) and small (137-158 amino acids) chains that are posttranslationally processed from a single mRNA. A single hydrophobic segment located near the carboxyl terminus of each small chain appears to be a transmembrane domain. The large chains appear to be entirely extracellular, and each contains four repeated putative Ca2+-binding domains of about 30 amino acids that have sequence similarities to other Ca2+-binding proteins. The identity among the protein sequences of the three receptor alpha-subunits ranges from 36.1% to 44.5%, with the Ca2+-binding domains having the greatest homology. These proteins apparently evolved by a process of gene duplication.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Fitzgerald LA,Poncz M,Steiner B,Rall SC Jr,Bennett JS,Phillips DR

doi

10.1021/bi00399a021

subject

Has Abstract

pub_date

1987-12-15 00:00:00

pages

8158-65

issue

25

eissn

0006-2960

issn

1520-4995

journal_volume

26

pub_type

杂志文章

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