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. 1990 Jul;87(14):5354–5358. doi: 10.1073/pnas.87.14.5354

Cloning of an integrin beta subunit exhibiting high homology with integrin beta 3 subunit.

S Suzuki 1, Z S Huang 1, H Tanihara 1
PMCID: PMC54322  PMID: 2371275

Abstract

cDNAs for another beta subunit of the integrin family were isolated with the aid of polymerase chain reaction and sequenced. The combined cDNA sequence is 3110 base pairs (bp) in size and has one long open reading frame of 2388 bp. The deduced amino acid sequence is similar to those of other integrin beta subunits but does not correspond to beta 1, beta 2, beta 3, or beta 4 subunits. This beta subunit is divided by a membrane-spanning domain into a large extracellular domain at the N-terminal side and a small intracellular domain at the C-terminal side. The extracellular domain has a cysteine-rich region that contains four repeats of 8-cysteine motifs. All 56 cysteine residues found in the extracellular domains of other mature beta subunits are present in this beta subunit. The beta subunit reported here has particularly high homology with the beta 3 subunit. The mRNA for the molecule is approximately 3.5 kbp in size and is expressed in various cell types. Other researchers have recently reported additional beta subunits that associate with the vitronectin receptor alpha subunit. The deduced amino acid sequence of this molecule contains the N-terminal partial amino acid sequence of one of these beta subunits, beta x. The beta subunit described herein seems to be identical to the beta x subunit and to function as the beta subunit of a vitronectin receptor.

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Selected References

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