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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Amino acid sequence of the vitronectin receptor alpha subunit and comparative expression of adhesion receptor mRNAs.

The amino acid sequence of the vitronectin receptor alpha subunit deduced from cDNA is presented. The sequence defines a 1047-amino-acid polypeptide precursor with a putative signal sequence, a large extracellular domain with several sites homologous to calcium binding sites in other proteins, a transmembrane domain, and a 32-amino-acid cytoplasmic domain. The 7-kilobase vitronectin receptor alpha subunit mRNA was found to be expressed in all cell lines examined, including endothelial cells, K562 and HEL leukemia cells, and osteosarcoma cells. In the two leukemia cell lines, the expression of the vitronectin receptor mRNA, as well as that of the fibronectin receptor, was enhanced in the presence of phorbol ester, a treatment known to increase the adhesiveness of these cells. The HEL cells were the only ones among the cell lines tested that also contained the mRNA of the platelet adhesion receptor alpha subunit, glycoprotein IIb. The expression of glycoprotein IIb was slightly enhanced by treatment of the cells with phorbol ester. These results complete the partial cDNA sequence of the vitronectin receptor alpha subunit published previously (Suzuki, S., Argraves, W. S., Pytela, R., Arai, H., Krusius, T., Pierschbacher, M. D., and Ruoslahti, E. (1986) Proc. Natl. Acad. Sci. U.S.A., 83, 8614-8618), confirm that the vitronectin receptor, and not IIb, is expressed in endothelial cells, and show that changes in the level of its expression correlate with changes in cell adhesiveness.[1]

References

  1. Amino acid sequence of the vitronectin receptor alpha subunit and comparative expression of adhesion receptor mRNAs. Suzuki, S., Argraves, W.S., Arai, H., Languino, L.R., Pierschbacher, M.D., Ruoslahti, E. J. Biol. Chem. (1987) [Pubmed]
 
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