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Chow J.C., Condorelli G., Smith R.J. Insulin-like growth factor-I receptor internalization regulates signaling via the Shc/mitogen-activated protein kinase pathway, but not the insulin receptor substrate-1 pathway. J Biol Chem. 273:1998;4672-4680. Using low temperature and dansylcadaverine to inhibit IGF-1 receptor endocytosis, this paper shows that the ability of IGF-1 receptors to induce Shc phosphorylation and MAPK activation are dependent upon receptor internalization. In contrast, IGF-1 receptor signaling via insulin receptor substrate 1 (IRS-1) phosphorylation to PI3K is independent of receptor endocytosis.
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Daaka Y., Luttrell L.M., Ahn S., Della Rocca G.J., Ferguson S.S.G., Caron M.G., Lefkowitz R.J. Essential role for G protein-coupled receptor endcytosis in the activation of MAP kinase. J Biol Chem. 273:1998;685-688. This paper reports that receptor endocytosis is required for signaling from β2 adrenergic receptors to ERKs. Inhibition of β2 adrenergic receptor sequestration using dominant-negative mutants of β-arrestin and dynamin blocks receptor endocytosis and ERK activation, without affecting G-protein coupling. β2 adrenergic receptor stimulated Shc phosphorylation and Raf activation are unaffected by the sequestration inhibitors, suggesting that endocytosis is required for signaling between Raf and MEK.
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This paper identifies the motif Tyr-Ile-Pro-Pro in the carboxyl tail of the AT1A receptor as the site of direct interaction between the receptor and JAK2. A mutant receptor lacking the motif is unable to activate JAK2. These data suggest that GPCRs can regulate tyrosine phosphorylation by physically associating with nonreceptor tyrosine kinases.
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Ali M.S., Sayeski P.P., Dirksen L.B., Hayzer D.J., Marrero M.B., Bernstein K.B. Dependence on the motif YIPP for the physical association of Jak2 kinase with the intracellular carboxyl tail of the angiotensin II AT1 receptor. J Biol Chem. 272:1997;23382-23388. This paper identifies the motif Tyr-Ile-Pro-Pro in the carboxyl tail of the AT1A receptor as the site of direct interaction between the receptor and JAK2. A mutant receptor lacking the motif is unable to activate JAK2. These data suggest that GPCRs can regulate tyrosine phosphorylation by physically associating with nonreceptor tyrosine kinases.
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This paper demonstrates that β-arrestins function as adaptor proteins, binding both agonist-occupied β2 adrenergic receptors and Src kinases, thus permitting the receptor to acquire agonist-regulated tyrosine kinase activity. β-arrestin mutants which are impaired in either Src binding or in clathrin-targeting inhibit β2 adrenergic receptor activation of ERKs, suggesting that both Src recruitment and receptor endocytosis are necessary for signal transduction.
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