A Novel 160-kDa Phosphotyrosine Protein in Insulin-treated Embryonic Kidney Cells Is a New Member of the Insulin Receptor Substrate Family

We have previously identified a 160-kDa protein in human embryonic kidney (HEK) 293 cells that undergoes rapid tyrosine phosphorylation in response to insulin (PY160) (Kuhné, M. R., Zhao, Z., and Lienhard, G. E. (1995) Biochem. Biophys. Res. Commun. 211, 190–197). The phosphotyrosine form of PY160 w...

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Bibliographic Details
Published in:The Journal of biological chemistry 1997-08, Vol.272 (34), p.21403-21407
Main Authors: Lavan, Brian E., Fantin, Valeria R., Chang, Ellen T., Lane, William S., Keller, Susanna R., Lienhard, Gustav E.
Format: Article
Language:English
Subjects:
Adaptor Proteins, Signal Transducing
Amino Acid Sequence
Cell Line
Cloning, Molecular
DNA, Complementary - genetics
Humans
Insulin - pharmacology
Insulin Receptor Substrate Proteins
Molecular Sequence Data
Molecular Weight
Phosphoproteins - genetics
Phosphoproteins - metabolism
Phosphotyrosine - chemistry
Receptor, Insulin - metabolism
Sequence Alignment
Sequence Homology, Amino Acid
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Summary:We have previously identified a 160-kDa protein in human embryonic kidney (HEK) 293 cells that undergoes rapid tyrosine phosphorylation in response to insulin (PY160) (Kuhné, M. R., Zhao, Z., and Lienhard, G. E. (1995) Biochem. Biophys. Res. Commun. 211, 190–197). The phosphotyrosine form of PY160 was purified from insulin-treated HEK 293 cells by anti-phosphotyrosine immunoaffinity chromatography, the sequences of peptides determined, and its cDNA cloned. The PY160 cDNA encodes a 1257-amino acid protein that contains, in order from its N terminus, a pleckstrin homology (PH) domain, a phosphotyrosine binding (PTB) domain, and, spread over the C-terminal portion, 12 potential tyrosine phosphorylation sites. Several of these sites are in motifs expected to bind specific SH2 domain-containing proteins: YXXM (7 sites), phosphatidylinositol 3-kinase; YVNM (1 site), Grb-2; and YIEV (1 site), either the protein-tyrosine phosphatase SHP-2 or phospholipase Cγ. Furthermore, the PH and PTB domains are highly homologous (at least 40% identical) to those found in insulin receptor substrates 1, 2, and 3 (IRS-1, IRS-2, and IRS-3). Thus, PY160 is a new member of the IRS family, which we have designated IRS-4.
ISSN:0021-9258
1083-351X
DOI:10.1074/jbc.272.34.21403