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  • Title: cDNA sequence of the human integrin beta 5 subunit.
    Author: McLean JW, Vestal DJ, Cheresh DA, Bodary SC.
    Journal: J Biol Chem; 1990 Oct 05; 265(28):17126-31. PubMed ID: 2211615.
    Abstract:
    A novel integrin receptor involved in cell adhesion to the matrix protein vitronectin has recently been described from a human lung epithelial-derived cell line (Cheresh, D. A., Smith, J. W., Cooper, H. M., and Quaranta, V. (1989) Cell 57, 59-69). This receptor has an alpha subunit that appears identical to the alpha v of the vitronectin receptor alpha v beta 3 expressed in melanoma and endothelial cells, but is complexed with a distinct beta subunit, beta 5. cDNA clones coding for beta 5 have been isolated and used to determine the mRNA and amino acid sequence of this new subunit. A 3.3-kilobase mRNA was found to code for a mature protein of 775 amino acid residues with a hydrophobic leader sequence of 24 amino acids. A 56% identity was found between the beta 5 and beta 3 protein sequences, making them the most closely related of the integrin beta subunits. Polymerase chain reaction abundance analysis revealed that alpha v and beta 5 mRNAs were found in seven very different cell lines, compared with beta 3 mRNA which was found in only three of the them, indicating that this new integrin receptor may be widely distributed.
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