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• W1585635925 endingPage "13244" @default.
• W1585635925 startingPage "13238" @default.
• W1585635925 abstract "Abstract In both NIH3T3 cells and HepG2 cells, insulin-like growth factor I (IGF-I) receptors possess two beta-subunits that display different electrophoretic mobilities. Increasing concentrations of IGF-I stimulated the phosphorylation of both beta-subunits to a similar extent, whereas insulin stimulated the phosphorylation of both subunits only at elevated concentrations. Both beta-subunits were immunoprecipitated with p5, an insulin receptor-specific anti-peptide antibody, or with A410, a polyclonal anti-insulin receptor antisera. However, if the tetrameric IGF-I receptor was first dissociated into alpha-beta heterodimers with 1 mM dithiothreitol, only the lower molecular weight beta-subunit was immunoprecipitated. These results suggested that p5 and A410 specifically recognized the lower molecular weight beta-subunit but immunoprecipitated the higher molecular weight beta-subunit because it was present in the same disulfide linked tetramer. Similarly, alpha-IR-3, an antibody specific for the alpha-subunit of the IGF-I receptor, immunoprecipitated both types of beta-subunit from the intact tetramer but only the higher molecular weight beta-subunit from the dissociated heterodimers, suggesting that there are two types of alpha-subunits in the same tetramer and that the alpha-subunit recognized by alpha-IR-3 is only associated with the higher molecular weight beta-subunit. Tryptic phosphopeptide maps of the lower molecular weight beta-subunit of IGF-I receptor were different from the higher molecular weight beta-subunit, but were similar to those of the insulin receptor beta-subunit. Thus, by immunochemical cross-reactivity and structural criteria, the lower molecular weight beta-subunit of the IGF-I receptor was similar to the beta-subunit of insulin receptor. These data suggest that there exists a species of IGF-I receptor that is a hybrid composed of an insulin receptor alpha-beta heterodimer and an IGF-I receptor alpha-beta heterodimer. The existence of such a hybrid receptor could have important functional consequences." @default.
• W1585635925 created "2016-06-24" @default.
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• W1585635925 date "1989-08-01" @default.
• W1585635925 modified "2023-10-15" @default.
• W1585635925 title "Insulin-like Growth Factor I Receptor β-Subunit Heterogeneity" @default.
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• W1585635925 doi "https://doi.org/10.1016/s0021-9258(18)51620-3" @default.
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