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. 1983 Apr;80(8):2137–2141. doi: 10.1073/pnas.80.8.2137

Tyrosine-specific protein kinase activity is associated with the purified insulin receptor.

M Kasuga, Y Fujita-Yamaguchi, D L Blithe, C R Kahn
PMCID: PMC393772  PMID: 6188161

Abstract

Highly purified human placental insulin receptors were obtained by sequential affinity chromatography on wheat germ agglutinin and insulin-agarose. The preparation had an insulin binding capacity of 4,700 pmol/mg of protein approaching theoretical purity. The purified receptor revealed three major bands of Mr 135,000, 95,000, and 52,000 in NaDodSO4/polyacrylamide gel electrophoresis after reduction by dithiothreitol. All three bands were immunoprecipitated by anti-insulin-receptor antibodies. When this preparation was incubated with [gamma-32P]ATP in the presence of MnCl2 (2 mM) and analyzed in NaDodSO4/acrylamide gel electrophoresis, only the Mr 95,000 band was labeled. Preincubation with several concentrations of insulin increased the 32P incorporation into this peptide in dose-dependent fashion, whereas insulin-like growth factors were approximately equal to 2% as potent and epidermal growth factor had little or no effect, consistent with their known affinities for the insulin receptor. Insulin stimulation of phosphorylation of the Mr 95,000 subunit of the receptor was observed also in immunoprecipitates of this highly purified insulin receptor by anti-insulin-receptor antibodies. Phosphoamino acid determination revealed only phosphotyrosine in both the basal and insulin-stimulated states. These data suggest that a tyrosine-specific protein kinase activity is closely associated with insulin receptor, and this may be important in the signal transmission required for insulin action.

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Selected References

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