Cited by 65Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsNicotinic Acetylcholine Receptors Study

LTP requires postsynaptic PDZ-domain interactions with glutamate receptor/auxiliary protein complexes

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Sheng, Nengyin, Bemben, Michael A., Díaz-Alonso, Javier, Tao, Wucheng, Shi, Yun Stone, Nicoll, Roger A.·2018·Proceedings of the National Academy of Sciences

Abstract

Long-term potentiation (LTP) is a persistent strengthening of synaptic transmission in the brain and is arguably the most compelling cellular and molecular model for learning and memory. Previous work found that both AMPA receptors and exogenously expressed kainate receptors are equally capable of expressing LTP, despite their limited homology and their association with distinct auxiliary subunits, indicating that LTP is far more promiscuous than previously thought. What might these two subtypes of glutamate receptor have in common? Using a single-cell molecular replacement strategy, we demonstrate that the AMPA receptor auxiliary subunit TARP γ-8, via its PDZ-binding motif, is indispensable for both basal synaptic transmission and LTP. Remarkably, kainate receptors and their auxiliary subunits Neto proteins share the same requirement of PDZ-binding domains for synaptic trafficking and LTP. Together, these results suggest that a minimal postsynaptic requirement for LTP is the PDZ binding of glutamate receptors/auxiliary subunits to PSD scaffolding proteins.

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Crossref · 10.1073/pnas.1800719115

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  • Phosphomimic mutations of TARP serines greatly diminish both binding of the TARP CTD to PSD-95 and rescue of AMPAR transmission in AMPAR-deleted cells.

    “Phosphomimic mutations greatly diminished both the binding of the TARP CTD to PSD-95 and the rescue of AMPAR transmission in AMPAR-deleted cells.”

    From Synaptic memory and CaMKII (2023) · cites this paper as [288]

    The Results and Significance passages report that deleting TARP γ-8’s PDZ-binding motif prevented rescue of synaptic currents in AMPAR-deleted cells; a separate passage says phosphor-null mutations did not fully rescue basal transmission. Neither passage reports the claimed effect of phosphomimic serine mutations, and the PSD-95 binding experiment described in our copy concerns GluK1/Neto1 rather than the TARP CTD. No page numbers are provided in our copy. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • Alanine substitutions of critical serines in the TARP CTD reduce AMPAR EPSCs but do not affect the magnitude of LTP.

    “Furthermore, alanine substitutions of the critical serines in the TARP CTD, although reducing AMPAR EPSCs, do not affect the magnitude of LTP (288).”

    From Synaptic memory and CaMKII (2023) · cites this paper as [288]

    The passage supplied under Significance (page not given) reports that phosphor-null mutations in tethered TARP γ-8 did not fully rescue basal synaptic transmission, while LTP was normal. This supports the direction of both effects, but the paper's finding is limited to tethered γ-8 with homomeric GluA1 receptors; the passage does not identify the substitutions as alanine, and it cautions that phosphorylation might matter for heteromeric AMPARs. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • TARPs stabilize AMPARs both on the cell surface and at synapses, and loss of TARPs results in decreased AMPAR expression, suggesting TARPless AMPARs become unstable.

    “TARPs have been shown to stabilize AMPARs both on the cell surface and at synapses (Bats et al., 2007, Sheng et al., 2018), and loss of TARPs results in decreased AMPAR expression, suggesting that “TARPless” AMPARs become unstable (Fukaya et al., 2006, Chen et al., 2000).”

    From The AMPA Receptor Code of Synaptic Plasticity (2018) · cites this paper as Sheng et al., 2018

    The Discussion reports that the PDZ ligand of TARP γ-8 is essential for moving surface AMPARs to synapses, supporting the synaptic part of the claim. The Results report equal surface AMPAR currents with intact γ-8 and a PDZ-motif-deficient mutant; the paper does not establish that TARPs stabilize AMPARs on the cell surface. The decreased-expression and instability clause is attributed to other citations, not Sheng et al. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Phosphorylation of the TARP C-terminus reduces interaction with membrane lipids and facilitates interaction with PSD95, serving to trap the TARP/AMPAR complex with the PSD.

    “Phosphorylation reduces the interaction with membrane lipids and facilitates interaction with PSD95, serving to trap the TARP/AMPAR complex with the PSD (Opazo et al., 2012, Bats et al., 2007, Sheng et al., 2018).”

    From The AMPA Receptor Code of Synaptic Plasticity (2018) · cites this paper as Sheng et al., 2018

    The Discussion (page not available) proposes that PSD-95 can capture AMPAR/TARP complexes through their PDZ ligands, supporting the trapping portion of the claim. It does not say that phosphorylation of the TARP C-terminus reduces membrane-lipid binding or facilitates PSD-95 binding; the phosphorylation described in that model is of synGAP. (LLM, conf=0.86)

    Experimental — accuracy not yet measured

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Authors
Sheng, N., Bemben, M. A., Díaz-Alonso, J., Tao, W., Shi, Y. S., & Nicoll, R. A.
Affiliations
University of California, San Francisco (US)
Venue
Proceedings of the National Academy of Sciences
Published
2018-03-26
Volume
115
Issue
15
Pages
3948-3953
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2843061105
Cited by
65
References
39
Citations by year
2026: 5 · 2025: 2 · 2024: 7 · 2023: 7 · 2022: 10 · 2021: 11 · 2020: 7 · 2019: 9 · 2018: 7
FWCI
3.87
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • the Strategy Priority Research Program of the Chinese Academy of Sciences (XDB13000000)
  • National Natural Science Foundation of China (31741055, 31371061, 31571060)
  • the Chinese Academy of Sciences Pioneer Hundred Talents Program (N/A)
  • Ministry of Science and Technology of the People's Republic of China (2014CB942804, 2015BAI08B02)
  • Natural Science Foundation of Jiangsu Province Grant (BK20140018)
  • HHS | NIH | National Institute of Mental Health (R01MH080379, R01MH070957, R56MH070957)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
Keywords
long-term potentiation, PDZ domain, AMPA receptors, kainate receptors, postsynaptic scaffolding proteins, synaptic transmission, learning and memory
MeSH terms
Animals, Humans, Protein Binding, Synapses, Calcium Channels, Long-Term Potentiation, Receptors, AMPA, Kainic Acid Receptors, Receptors, Kainic Acid, PDZ Domains

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