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

Cloning, primary structure and properties of a novel human integrin beta subunit.

The originally described integrin beta subunits that define the three subfamilies of integrin heterodimers are beta 1, beta 2 and beta 3. In this paper, we describe the isolation of a cDNA coding for a novel human integrin beta subunit, designated as beta 5. The beta 5 cDNA was isolated from a human thymic epithelial cell library, using oligonucleotide probes that were designed from a region highly conserved among the known beta 1, beta 2 and beta 3 sequences. The beta 5 cDNA codes for 799 (or 796) amino acids, including a 23 amino acid leader sequence. There are 776 (or 773) amino acids in the mature protein, which includes a long extracellular domain of 696 amino acids, a transmembrane domain and an intracellular C-terminal domain of 57 amino acids. The beta 5 sequence resembled the known beta 3, beta 1 and beta 2 sequences by 55, 43 and 38%, respectively, including conservation of 56/56 cysteines. Rabbit antiserum was prepared against a 20 amino acid synthetic peptide predicted from the beta 5 C-terminal sequence. This serum immunoprecipitated a beta 5 protein that was 100,000 Mr (reduced) and 95,000 Mr (nonreduced). Only a single alpha subunit was detected in association with beta 5, and that alpha subunit was immunochemically indistinguishable from the alpha v subunit previously found as part of the vitronectin receptor complex. By immunoprecipitation, beta 5 was most prevalent on carcinoma cell lines, was also present on hepatoma and fibroblast cell lines, and was absent from lymphoblastoid cells and platelets.[1]

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