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• W1574164310 startingPage "7224" @default.
• W1574164310 abstract "Abstract A close relationship between Sam68, a tyrosine and proline-rich RNA-binding protein, and Src protein tyrosine kinases (PTK) has already been established, also in T lymphocytes. A constitutive phosphorylation of the molecule has also been documented in various transformed T cells, which probably reflects an increased expression of PTK of the Src family. Using the hybridoma T cell line, T8.1, or Jurkat T cells, we investigated the respective contribution of the two Src kinases Fyn and Lck, expressed in T cells, in this phenomenon. By overexpressing the two proteins, we show that the constitutive phosphorylation of Sam68 in vivo directly correlates with cellular Fyn levels, but not with Lck expression, despite the capacity of the PTK to strongly phosphorylate the molecule in vitro. Overexpressed Fyn is mainly localized at the cell membrane. We find that Sam68 phosphorylation, including in the nuclear fraction in which the molecule is predominantly expressed, is lost with a delocalized Fyn mutant deleted of its N-terminal membrane-anchoring domain. Finally, we demonstrate, using a construct encoding a Sam68 molecule without its nuclear localization signal, that nuclear expression of Sam68 is not required for phosphorylation. We conclude that the constitutive phosphorylation of Sam68 in T cells is a Fyn-dependent process occurring in a cell-membrane compartment from which phospho-Sam68 molecules can thereafter accumulate into the nucleus." @default.
• W1574164310 created "2016-06-24" @default.
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• W1574164310 date "1999-06-15" @default.
• W1574164310 modified "2023-09-25" @default.
• W1574164310 title "Fyn Membrane Localization Is Necessary to Induce the Constitutive Tyrosine Phosphorylation of Sam68 in the Nucleus of T Lymphocytes" @default.
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• W1574164310 doi "https://doi.org/10.4049/jimmunol.162.12.7224" @default.
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• W1574164310 hasPublicationYear "1999" @default.
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