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Tyrosine phosphorylation of tau regulates its interactions with Fyn SH2 domains, but not SH3 domains, altering the cellular localization of tau

Tyrosine phosphorylation of tau regulates its interactions with Fyn SH2 domains, but not SH3 domains, altering the cellular localization of tau

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Authors

  • Alessia Usardi
  • Amy M. Pooler
  • Anjan Seereeram
  • C. Hugh Reynolds
  • Pascal Derkinderen
  • Brian Anderton
  • Diane P. Hanger
  • Wendy Noble
  • Ritchie Williamson

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    Info

    Original languageEnglish
    Pages2927-2937
    Number of pages11
    JournalFEBS Journal
    Journal publication date1 Aug 2011
    Volume278
    Issue16
    Early online date7/07/11
    DOIs
    StatePublished

    Abstract

    Recent reports have demonstrated that interactions between the microtubule-associated protein tau and the nonreceptor tyrosine kinase Fyn play a critical role in mediating synaptic toxicity and neuronal loss in response to ß-amyloid (Aß) in models of Alzheimer's disease. Disruption of interactions between Fyn and tau may thus have the potential to protect neurons from Aß-induced neurotoxicity. Here, we investigated tau and Fyn interactions and the potential implications for positioning of these proteins in membrane microdomains. Tau is known to bind to Fyn via its Src-homology (SH)3 domain, an association regulated by phosphorylation of PXXP motifs in tau. Here, we show that Pro216 within the PXXP(213-216) motif in tau plays an important role in mediating the interaction of tau with Fyn-SH3. We also show that tau interacts with the SH2 domain of Fyn, and that this association, unlike that of Fyn-SH3, is influenced by Fyn-mediated tyrosine phosphorylation of tau. In particular, phosphorylation of tau at Tyr18, a reported target of Fyn, is important for mediating Fyn-SH2-tau interactions. Finally, we show that tyrosine phosphorylation influences the localization of tau to detergent-resistant membrane microdomains in primary cortical neurons, and that this trafficking is Fyn-dependent. These findings may have implications for the development of novel therapeutic strategies aimed at disrupting the tau/Fyn-mediated synaptic dysfunction that occurs in response to elevated Aß levels in neurodegenerative disease. © 2011 FEBS.

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