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Updated: Jul 12, 2025

Detection of Protein Palmitoylation in Cultured Hippocampal Neurons by Immunoprecipitation and Acyl-Biotin Exchange ABE
Published on: February 18, 2013
Coordinated interplay between palmitoylation, phosphorylation and SUMOylation regulates kainate receptor surface
Busra P Yucel1, Enaam M Al Momany1, Ashley J Evans1
1Centre for Synaptic Plasticity, School of Biochemistry, Biomedical Sciences Building, University of Bristol, Bristol, United Kingdom.
Kainate receptor (KAR) palmitoylation stabilizes surface expression. Activity-dependent depalmitoylation triggers phosphorylation and SUMOylation, leading to KAR endocytosis and regulating neuronal excitability.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Biology
Background:
- Kainate receptors (KARs) regulate neuronal excitability and synaptic transmission.
- Post-translational modifications (PTMs) of the GluK2 subunit control KAR surface expression.
- Previous work showed agonist activation induces GluK2 phosphorylation and SUMOylation, promoting receptor endocytosis.
Purpose of the Study:
- To investigate the interplay between GluK2 palmitoylation, phosphorylation, and SUMOylation.
- To determine how these PTMs affect KAR trafficking and surface expression.
Main Methods:
- Utilized a library of site-specific GluK2 mutants.
- Analyzed KAR surface expression and PTMs under basal and stimulated conditions.
- Assessed the impact of mutations on kainate-induced receptor internalization.
Main Results:
- GluK2 exhibits basal palmitoylation, which decreases upon kainate stimulation.
- A non-palmitoylatable GluK2 mutant (C858/C871A) showed increased basal phosphorylation and SUMOylation.
- This mutant was insensitive to kainate-induced internalization, indicating palmitoylation's role in stabilization.
Conclusions:
- GluK2 palmitoylation stabilizes KAR surface expression.
- Dynamic depalmitoylation is crucial for activity-dependent KAR endocytosis.
- This process involves downstream phosphorylation and SUMOylation, regulating neuronal function.
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