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• W2116723161 abstract "1. Insulin receptors were partially purified from rat liver by chromatography on wheat-germ-lectin-Sepharose. Incubation with [gamma-32P]ATP in the presence of insulin resulted in increased phosphorylation of the beta-subunit on both tyrosine and serine residues. Two-dimensional mapping of tryptic peptides showed that, in agreement with previous studies using preparations of receptors from other sources, the tyrosine residues involved were the three tyrosines in the kinase domain (corresponding to tyrosines 1158, 1162 and 1163 of the human receptor) plus two tyrosines close to the C-terminus (corresponding to tyrosines 1328 and 1334). 2. The effects of insulin on the phosphorylation of receptors within intact rat liver cells were determined by incubating cells in the presence of [32P]Pi for 50 min and then with or without insulin for a further 10 min. The labelled receptors were then rapidly isolated by sequential use of wheat-germ-lectin-Sepharose chromatography and immuno-isolation using a monoclonal antibody to the C-terminal end of the beta-subunit. 3. Insulin was found to increase overall phosphorylation of the receptor nearly 3-fold. Two-dimensional mapping was then carried out in combination with phosphoamino acid analysis. This revealed that the pattern of phosphorylation of the receptors in cells incubated in the absence and presence of insulin exhibited a number of marked differences from that observed in previous studies on intact cells, which had been restricted to cells expressing very high levels of insulin receptors such as certain hepatoma-derived cells or cells transfected with insulin receptor cDNA. The differences in the effects of insulin included a larger increase in the proportion of receptors being phosphorylated on the three tyrosine residues of the kinase domain, no apparent phosphorylation of the two tyrosine residues close to the C-terminus and no increase in either threonine or overall serine phosphorylation. 4. The receptors appeared to be phosphorylated on a number of different serine residues in cells incubated in the absence of insulin. Evidence for both increases and decreases in the phosphorylation of specific serine residues on addition of insulin was obtained. 5. It is concluded that care should be taken when extrapolating findings on the phosphorylation of the insulin receptor within cultured cells to more physiological situations." @default.
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• W2116723161 date "1991-04-01" @default.
• W2116723161 modified "2023-10-05" @default.
• W2116723161 title "Analysis of insulin receptor phosphorylation sites in intact rat liver cells by two-dimensional phosphopeptide mapping. Predominance of the tris-phosphorylated form of the kinase domain after stimulation by insulin" @default.
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• W2116723161 doi "https://doi.org/10.1042/bj2750015" @default.
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