TARP Phosphorylation Regulates Synaptic AMPA Receptors through Lipid Bilayers
Open accessAbstract
Neurons use neurotransmitters to communicate across synapses, constructing neural circuits in the brain. AMPA-type glutamate receptors are the predominant excitatory neurotransmitter receptors mediating fast synaptic transmission. AMPA receptors localize at synapses by forming protein complexes with transmembrane AMPA receptor regulatory proteins (TARPs) and PSD-95-like membrane-associated guanylate kinases. Among the three classes of ionotropic glutamate receptors (AMPA, NMDA, and kainate type), AMPA receptor activity is most regulatable by neuronal activity to adjust synaptic strength. Here, we mutated the prototypical TARP, stargazin, and found that TARP phosphorylation regulates synaptic AMPA receptor activity in vivo. We also found that stargazin interacts with negatively charged lipid bilayers in a phosphorylation-dependent manner and that the lipid interaction inhibited stargazin binding to PSD-95. Cationic lipids dissociated stargazin from lipid bilayers and enhanced synaptic AMPA receptor activity in a stargazin phosphorylation-dependent manner. Thus, TARP phosphorylation plays a critical role in regulating AMPA receptor-mediated synaptic transmission via a lipid bilayer interaction.
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CaMKII phosphorylation of TARP serines neutralizes charge, releasing the CTD and providing access to the PDZ domains of PSD-95.
“CaMKII phosphorylation of the serines neutralizes the charge, releasing the CTD and providing access to the PDZ domains of PSD-95 (284, 285, 287).”
From Synaptic memory and CaMKII (2023) · cites this paper as [285]
The Discussion (‘Roles of multiple phosphorylation sites in TARPs’; page unavailable) says acidic phosphorylated serines inhibit the electrostatic interaction of stargazin’s basic residues with negatively charged lipid bilayers. The Results (‘Lipid bilayers inhibit binding of stargazin to PSD-95’; page unavailable) say phosphorylation permits dissociation from lipids and binding to PSD-95. Our copy does not identify CaMKII as the kinase responsible for this mechanism, so that attribution is unsupported. (LLM, conf=0.86)
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“It has been shown that PICK1 interacts with lipids via the BAR domain and the PDZ domain, independently (Jin et al., 2006; Pan et al., 2007; Steinberg et al., 2006).”
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- Authors
- Sumioka, A., Yan, D., & Tomita, S.
- Affiliations
- Yale University (US)
- Corresponding author
- Tomita, Susumu
- Venue
- Neuron
- Publisher
- Elsevier BV
- Published
- 2010-06
- Volume
- 66
- Issue
- 5
- Pages
- 755-767
- ISSN
- 0896-6273 (ISSN-L)
- PMC
- PMC2887694
- OpenAlex
- W1977873923
- Cited by
- 167
- References
- 5
- Citations by year
- 2026: 2 · 2025: 6 · 2024: 12 · 2023: 7 · 2022: 8 · 2021: 12 · 2020: 8 · 2019: 10 · 2018: 17 · 2017: 8 · 2016: 9 · 2015: 12 · 2014: 14 · 2013: 14 · 2012: 14
- FWCI
- 5.43
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- Locations
- Neuron (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- University of California, San Diego
- National Institute of Mental Health (MH077939, R01MH077939, R56MH077939)
- National Institute on Drug Abuse (P30DA018343)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
- Keywords
- stargazin, AMPA receptors, synaptic transmission, lipid bilayer interaction, PSD-95, ionotropic glutamate receptors, synaptic plasticity, cationic lipids
- MeSH terms
- Animals, Cricetulus, Cricetinae, Lipid Bilayers, Membrane Proteins, Mice, Mutant Strains, Phosphorylation, Synapses, Calcium Channels, CHO Cells, Receptors, AMPA, Mice, Gene Knock-In Techniques
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