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. 1990 Aug;87(16):6112–6116. doi: 10.1073/pnas.87.16.6112

Cloning and expression of a widely expressed receptor tyrosine phosphatase.

J Sap 1, P D'Eustachio 1, D Givol 1, J Schlessinger 1
PMCID: PMC54482  PMID: 2166945

Abstract

We describe the identification of a widely expressed receptor-type (transmembrane) protein tyrosine phosphatase (PTPase; EC 3.1.3.48). Screening of a mouse brain cDNA library under low-stringency conditions with a probe encompassing the intracellular (phosphatase) domain of the CD45 lymphocyte antigen yielded cDNA clones coding for a 794-amino acid transmembrane protein [hereafter referred to as receptor protein tyrosine phosphatase alpha (R-PTP-alpha)] with an intracellular domain displaying clear homology to the catalytic domains of CD45 and LAR (45% and 53%, respectively). The 142-amino acid extracellular domain (including signal peptide) of R-PTP-alpha is marked by a high serine/threonine content (32%) as well as eight potential N-glycosylation sites but displays no similarity to known proteins. Genetic mapping assigns the gene for R-PTP-alpha to mouse chromosome 2, closely linked to the Il-1a and Bmp-2a loci. The corresponding mRNA (3.0 kilobases) is expressed in most murine tissues and most abundantly expressed in brain and kidney. Antibodies against a synthetic peptide of R-PTP-alpha identified a 130-kDa protein in cells transfected with the R-PTP-alpha cDNA.

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Selected References

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