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Cover ArticleArticles, Cellular/Molecular

The Palmitoyl Acyltransferase DHHC2 Regulates Recycling Endosome Exocytosis and Synaptic Potentiation through Palmitoylation of AKAP79/150

Kevin M. Woolfrey, Jennifer L. Sanderson and Mark L. Dell'Acqua
Journal of Neuroscience 14 January 2015, 35 (2) 442-456; DOI: https://doi.org/10.1523/JNEUROSCI.2243-14.2015
Kevin M. Woolfrey
1Department of Pharmacology and
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Jennifer L. Sanderson
1Department of Pharmacology and
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Mark L. Dell'Acqua
1Department of Pharmacology and
2Program in Neuroscience University of Colorado School of Medicine, Anschutz Medical Campus, Aurora, Colorado 80045
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Abstract

Phosphorylation and dephosphorylation of AMPA-type ionotropic glutamate receptors (AMPARs) by kinases and phosphatases and interactions with scaffold proteins play essential roles in regulating channel biophysical properties and trafficking events that control synaptic strength during NMDA receptor-dependent synaptic plasticity, such as LTP and LTD. We previously demonstrated that palmitoylation of the AMPAR-linked scaffold protein A-kinase anchoring protein (AKAP) 79/150 is required for its targeting to recycling endosomes in dendrites, where it regulates exocytosis from these compartments that is required for LTP-stimulated enlargement of postsynaptic dendritic spines, delivery of AMPARs to the plasma membrane, and maintenance of synaptic potentiation. Here, we report that the recycling endosome-resident palmitoyl acyltransferase DHHC2 interacts with and palmitoylates AKAP79/150 to regulate these plasticity signaling mechanisms. In particular, RNAi-mediated knockdown of DHHC2 expression in rat hippocampal neurons disrupted stimulation of exocytosis from recycling endosomes, enlargement of dendritic spines, AKAP recruitment to spines, and potentiation of AMPAR-mediated synaptic currents that occur during LTP. Importantly, expression of a palmitoylation-independent lipidated AKAP mutant in DHHC2-deficient neurons largely restored normal plasticity regulation. Thus, we conclude that DHHC2-AKAP79/150 signaling is an essential regulator of dendritic recycling endosome exocytosis that controls both structural and functional plasticity at excitatory synapses.

  • A-kinase anchoring protein
  • AMPAR
  • LTP
  • palmitoylation
  • recycling endosome
  • trafficking
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The Journal of Neuroscience: 35 (2)
Journal of Neuroscience
Vol. 35, Issue 2
14 Jan 2015
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The Palmitoyl Acyltransferase DHHC2 Regulates Recycling Endosome Exocytosis and Synaptic Potentiation through Palmitoylation of AKAP79/150
Kevin M. Woolfrey, Jennifer L. Sanderson, Mark L. Dell'Acqua
Journal of Neuroscience 14 January 2015, 35 (2) 442-456; DOI: 10.1523/JNEUROSCI.2243-14.2015

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The Palmitoyl Acyltransferase DHHC2 Regulates Recycling Endosome Exocytosis and Synaptic Potentiation through Palmitoylation of AKAP79/150
Kevin M. Woolfrey, Jennifer L. Sanderson, Mark L. Dell'Acqua
Journal of Neuroscience 14 January 2015, 35 (2) 442-456; DOI: 10.1523/JNEUROSCI.2243-14.2015
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Keywords

  • A-kinase anchoring protein
  • AMPAR
  • LTP
  • palmitoylation
  • recycling endosome
  • trafficking

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