title: Molecular cloning of a novel protein-tyrosine phosphatase SH-PTP3 with sequence similarity to the src-homology region 2.
abstract: Protein-tyrosine phosphorylation and dephosphorylation are directly associated with cellular growth, signal transduction, and neoplastic transformation. Here we report the isolation of a complementary DNA (cDNA) clone encoding a novel protein-tyrosine phosphatase (PTP) from a human T cell PEER cDNA library. The predicted open reading frame encodes a approximately 68-kDa protein composed of 593 amino acids which contains two src-homology region 2's (SH2 domains) at the N terminus; this PTP is designated as SH-PTP3. Northern blot analysis revealed that SH-PTP3 mRNA was expressed throughout many tissues and the transcriptional size was consistent at about 6.0 kb. As with other SH2 domains in src-family kinases, the SH2 domains of SH-PTP3 may play a crucial role in interactions with tyrosine phosphorylated signaling proteins, including itself and protein tyrosine kinases (PTKs), to regulate targets' enzyme activity.
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D015139:Blotting, Southern; D003001:Cloning, Molecular; D004247:DNA; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins; D008969:Molecular Sequence Data; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases / Q000235:genetics* / Q000378:metabolism; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D016392:Proto-Oncogene Proteins pp60(c-src); D051381:Rats; D017386:Sequence Homology, Amino Acid; D014158:Transcription, Genetic
chemical_list: D047908:Intracellular Signaling Peptides and Proteins; D004247:DNA; D011505:Protein-Tyrosine Kinases; D016392:Proto-Oncogene Proteins pp60(c-src); C516724:PTPN11 protein, human; C509249:PTPN6 protein, human; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; D053824:Protein Tyrosine Phosphatase, Non-Receptor Type 6; D017027:Protein Tyrosine Phosphatases; C516727:Ptpn11 protein, rat; C509250:Ptpn6 protein, rat