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- W1645132064 abstract "Mutations of the insulin receptor gene have been shown to cause insulin-resistant diabetes in patients with genetic forms of insulin resistance. We have previously reported that a mutation substituting valine for Phe382 in the alpha-subunit of the insulin receptor is associated with impaired transport of the mutant receptor to the plasma membrane (Accili, D., Frapier, C., Mosthaf, L., McKeon, C., Elbein, S. C., Permutt, M. A., Ramos, E., Lander, E. S., Ullrich, A., and Taylor, S. I. (1989) EMBO J. 8, 2509-2517). In this study, we demonstrate that the Val382 mutation impairs the ability of insulin to activate receptor autophosphorylation. Furthermore, the Val382 receptor has reduced activity to phosphorylate other peptide substrates in the presence of insulin. Nevertheless, when the Val382 mutant and wild-type receptors are mixed together, the wild-type human insulin receptor is able to phosphorylate the Val382 mutant receptor, thereby activating the tyrosine kinase activity of the mutant receptor. Thus, the conformational change caused by the Val382 mutation compromises the ability of the receptor to transmit a signal across the plasma membrane. Furthermore, our observations suggest that receptor phosphorylation by an intermolecular mechanism (i.e. transphosphorylation) may play a role in mediating the action of insulin upon the target cell." @default.
- W1645132064 created "2016-06-24" @default.
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- W1645132064 date "1991-01-01" @default.
- W1645132064 modified "2023-09-30" @default.
- W1645132064 title "A mutation in the extracellular domain of the insulin receptor impairs the ability of insulin to stimulate receptor autophosphorylation." @default.
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- W1645132064 doi "https://doi.org/10.1016/s0021-9258(18)52453-4" @default.
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