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 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 Cgamma. 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.
Lavan
B E
BE
Department of Biochemistry, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.
Fantin
V R
VR
Chang
E T
ET
Lane
W S
WS
Keller
S R
SR
Lienhard
G E
GE
D048868:Adaptor Proteins, Signal Transducing; D000595:Amino Acid Sequence; D002460:Cell Line; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D006801:Humans; D007328:Insulin / Q000494:pharmacology*; D055504:Insulin Receptor Substrate Proteins; D008969:Molecular Sequence Data; D008970:Molecular Weight; D010750:Phosphoproteins / Q000235:genetics* / Q000378:metabolism*; D019000:Phosphotyrosine / Q000737:chemistry; D011972:Receptor, Insulin / Q000378:metabolism*; D016415:Sequence Alignment; D017386:Sequence Homology, Amino Acid
D048868:Adaptor Proteins, Signal Transducing; D018076:DNA, Complementary; C107686:IRS4 protein, human; D007328:Insulin; D055504:Insulin Receptor Substrate Proteins; D010750:Phosphoproteins; D019000:Phosphotyrosine; D011972:Receptor, Insulin