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Shisa6 traps AMPA receptors at postsynaptic sites and prevents their desensitization during synaptic activity

Author

Listed:
  • Remco V. Klaassen

    (Department Molecular and Cellular Neurobiology)

  • Jasper Stroeder

    (Department Molecular and Cellular Neurobiology
    Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University)

  • Françoise Coussen

    (University of Bordeaux, Interdisciplinary Institute for Neuroscience, UMR 5297
    CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297)

  • Anne-Sophie Hafner

    (University of Bordeaux, Interdisciplinary Institute for Neuroscience, UMR 5297
    CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297)

  • Jennifer D. Petersen

    (University of Bordeaux, Interdisciplinary Institute for Neuroscience, UMR 5297
    CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297)

  • Cedric Renancio

    (University of Bordeaux, Interdisciplinary Institute for Neuroscience, UMR 5297
    CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297)

  • Leanne J. M. Schmitz

    (Department Molecular and Cellular Neurobiology)

  • Elisabeth Normand

    (University of Bordeaux, Interdisciplinary Institute for Neuroscience, UMR 5297
    CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297)

  • Johannes C. Lodder

    (Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University)

  • Diana C. Rotaru

    (Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University)

  • Priyanka Rao-Ruiz

    (Department Molecular and Cellular Neurobiology)

  • Sabine Spijker

    (Department Molecular and Cellular Neurobiology)

  • Huibert D. Mansvelder

    (Center for Neurogenomics and Cognitive Research, Neuroscience Campus Amsterdam, VU University)

  • Daniel Choquet

    (University of Bordeaux, Interdisciplinary Institute for Neuroscience, UMR 5297
    CNRS, Interdisciplinary Institute for Neuroscience, UMR 5297)

  • August B. Smit

    (Department Molecular and Cellular Neurobiology)

Abstract

Trafficking and biophysical properties of AMPA receptors (AMPARs) in the brain depend on interactions with associated proteins. We identify Shisa6, a single transmembrane protein, as a stable and directly interacting bona fide AMPAR auxiliary subunit. Shisa6 is enriched at hippocampal postsynaptic membranes and co-localizes with AMPARs. The Shisa6 C-terminus harbours a PDZ domain ligand that binds to PSD-95, constraining mobility of AMPARs in the plasma membrane and confining them to postsynaptic densities. Shisa6 expressed in HEK293 cells alters GluA1- and GluA2-mediated currents by prolonging decay times and decreasing the extent of AMPAR desensitization, while slowing the rate of recovery from desensitization. Using gene deletion, we show that Shisa6 increases rise and decay times of hippocampal CA1 miniature excitatory postsynaptic currents (mEPSCs). Shisa6-containing AMPARs show prominent sustained currents, indicating protection from full desensitization. Accordingly, Shisa6 prevents synaptically trapped AMPARs from depression at high-frequency synaptic transmission.

Suggested Citation

  • Remco V. Klaassen & Jasper Stroeder & Françoise Coussen & Anne-Sophie Hafner & Jennifer D. Petersen & Cedric Renancio & Leanne J. M. Schmitz & Elisabeth Normand & Johannes C. Lodder & Diana C. Rotaru , 2016. "Shisa6 traps AMPA receptors at postsynaptic sites and prevents their desensitization during synaptic activity," Nature Communications, Nature, vol. 7(1), pages 1-12, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10682
    DOI: 10.1038/ncomms10682
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