Journal
NATURE COMMUNICATIONS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms10682
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Funding
- EU-FP7 'SynSys' [HEALTH-2009-2.1.2-1, 242167]
- NWO-ALW [ALW2PJ/12048]
- EU Marie Curie ITN CerebNet [MEST-ITN-2008-238686]
- Dutch Neuro-Bsik Mouse Pharma Phenomics consortium from SenterNovem [BSIK 03053]
- EU Marie Curie ITN 'Neuromics' [MEST-CT-2005-020919]
- NWO VICI grant (ALW-Vici) [016.150.673, 865.13.002]
- ERC grant BrainSignals [281443]
- Ministere de l'Enseignement Superieur et de la Recherche
- Centre National de la Recherche Scientifique
- Conseil Regional d'Aquitaine
- ERC grant nano-dyn-syn
- European Research Council (ERC) [281443] Funding Source: European Research Council (ERC)
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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.
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