Nanoscale Scaffolding Domains within the Postsynaptic Density Concentrate Synaptic AMPA Receptors
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Scaffolding molecules at the postsynaptic membrane form the foundation of excitatory synaptic transmission by establishing the architecture of the postsynaptic density (PSD), but the small size of the synapse has precluded measurement of PSD organization in live cells. We measured the internal structure of the PSD in live neurons at approximately 25 nm resolution using photoactivated localization microscopy (PALM). We found that four major PSD scaffold proteins were each organized in distinctive ∼80 nm ensembles able to undergo striking changes over time. Bidirectional PALM and single-molecule immunolabeling showed that dense nanodomains of PSD-95 were preferentially enriched in AMPA receptors more than NMDA receptors. Chronic suppression of activity triggered changes in PSD interior architecture that may help amplify synaptic plasticity. The observed clustered architecture of the PSD controlled the amplitude and variance of simulated postsynaptic currents, suggesting several ways in which PSD interior organization may regulate the strength and plasticity of neurotransmission.
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Presynaptic RIM nanoclusters closely align with concentrated postsynaptic receptors and scaffolding proteins.
“These presynaptic RIM nanoclusters closely aligned with concentrated postsynaptic receptors and scaffolding proteins4–6, suggesting a transsynaptic molecular “nanocolumn.””
From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [4]
The Results section reports that AMPA receptors are enriched in postsynaptic PSD-95 scaffold clusters. The Discussion proposes pre–post alignment as a possibility but also says these clusters may concentrate receptors toward the synapse’s center rather than specifically align them with release sites. It does not establish close alignment with presynaptic RIM nanoclusters. (LLM, conf=0.88)
Experimental — accuracy not yet measuredThe average estimated diameter of RIM1/2 nanoclusters is very close to the reported size of PSD-95 and AMPA receptor nanoclusters.
“The average estimated diameter of ~80 nm for RIM1/2 NCs was very close to the reported size of PSD-95 and AMPA receptor (AMPAR) NCs4–6.”
From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [4]
The Results section, “Scaffold molecules are organized in subsynaptic clusters” (page unavailable), reports a PSD-95 subcluster diameter of 83 ± 4 nm, close to the citing sentence’s ~80 nm. The Results section, “Subsynaptic scaffolding domains concentrate synaptic AMPARs” (page unavailable), reports AMPAR enrichment within those domains but does not give a separate AMPAR nanocluster diameter. This source therefore supports the PSD-95 size comparison, but not the stated AMPAR nanocluster size. (LLM, conf=0.84)
Experimental — accuracy not yet measuredThe impact of presynaptic nanoscale organization and confined vesicle sites on the synapse as a whole depends strongly on whether RIM nanoclusters align with postsynaptic receptor nanoclusters.
“For the synapse as a whole, the impact of presynaptic nanoscale organization and confined vesicle sites (Fig. 1, 2) will depend strongly on whether these RIM NCs align with postsynaptic receptor NCs4.”
From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [4]
The Results section (‘Clustered distribution shapes postsynaptic responses’; page not provided) reports simulated currents nearly twice as large when vesicles released glutamate over AMPA-receptor clusters rather than off-cluster. The Discussion identifies pre–post alignment as a way to maximize transmission, but does not establish that this effect depends on alignment of RIM nanoclusters specifically; it also reports an advantage for clustered receptors even with randomly distributed release sites. (LLM, conf=0.85)
Experimental — accuracy not yet measuredThe RIM1-mEos3 distribution was nonuniform and contained nanoclusters with an average diameter of 80.95 ± 5.34 nm using adapted SR-Tesseler analysis and 78.93 ± 5.85 nm using nearest neighbor distance analysis.
“The distribution of RIM1-mEos3 was nonuniform and contained NCs with an average diameter of 80.95 ± 5.34 nm and 78.93 ± 5.85 nm using either an adapted SR-Tesseler analysis15 or nearest neighbor distance analysis4, respectively (Extended Data Fig. 6f), consistent with our 3D-STORM results (Fig. 1).”
From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [4]
In Results (‘Scaffold molecules are organized in subsynaptic clusters’; page unavailable), the source reports postsynaptic scaffold clusters with an 83 ± 4 nm diameter, broadly consistent with the cited sentence’s nanoscale-cluster comparison. It does not report RIM1-mEos3 measurements or either stated diameter, and its described analyses count neighbors within a radius and use pair-correlation and Monte Carlo methods rather than explicitly identifying a nearest-neighbor distance analysis. (LLM, conf=0.82)
Experimental — accuracy not yet measuredTetraSpeck beads were localized to correct alignment between the two channels, and the average deviation of the bead localizations after correction was between 10 and 15 nm.
“TetraSpeck beads (100 nm; Invitrogen) deposited on a coverslip were localized to correct alignment between the two channels as described4. The average deviation of the bead localizations after correction was between 10 and 15 nm.”
From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [4]
The Experimental Procedures (page unavailable) say that images from two channels were acquired simultaneously, drift-corrected, and aligned. Our copy does not say that TetraSpeck beads were used for alignment or report a 10–15 nm average deviation after correction; the Results’ <15 nm figure concerns molecule-localization precision, not bead alignment. (LLM, conf=0.84)
Experimental — accuracy not yet measured
The alignment of pre- and postsynaptic nanoscale subdomains suggests that even small synapses may be composed of dynamic functional modules.
“The alignment of pre and postsynaptic nanoscale subdomains4–6 suggests that even small synapses may be composed of dynamic functional modules28,29.”
From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [4]
Sensitivity of PSD-95 nanocluster size to latrunculin suggests that the spine cytoskeleton is engaged at the base of the column.
“Nevertheless, sensitivity of PSD-95 NC size to latrunculin4 further suggests that the spine cytoskeleton is engaged at the “base” of the column.”
From A trans-synaptic nanocolumn aligns neurotransmitter release to receptors (2016) · cites this paper as [4]
Glutamate receptors localize to submicron scale clusters within the synaptic membrane.
“In addition, recent studies have shown that glutamate receptors localize to submicron scale clusters within the synaptic membrane as shown by various techniques ranging from EM to PALM microscopy (Ehlers et al., 2007; MacGillavry et al., 2013; Nair et al., 2013).”
From Barriers in the brain: resolving dendritic spine morphology and compartmentalization (2014) · cites this paper as MacGillavry et al., 2013
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- Authors
- MacGillavry, H. D., Song, Y., Raghavachari, S., & Blanpied, T. A.
- Affiliations
- University of Maryland, Baltimore (US)
- Duke University (US)
- Duke Medical Center (US)
- Corresponding author
- Blanpied, Thomas A.
- Venue
- Neuron
- Publisher
- Elsevier BV
- Published
- 2013-05
- Volume
- 78
- Issue
- 4
- Pages
- 615-622
- ISSN
- 0896-6273 (ISSN-L)
- PMC
- PMC3668352
- OpenAlex
- W2014164931
- Cited by
- 442
- References
- 8
- Citations by year
- 2026: 26 · 2025: 30 · 2024: 38 · 2023: 24 · 2022: 40 · 2021: 48 · 2020: 40 · 2019: 34 · 2018: 35 · 2017: 36 · 2016: 30 · 2015: 27 · 2014: 25 · 2013: 9
- FWCI
- 14.89
- 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
- National Institutes of Health (1s10od010352-01)
- National Institute of Mental Health (R01MH080046, MH080046, MH096376, R01MH096376, R37MH080046)
- National Institute on Drug Abuse (R01DA027807, DA027807)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Advanced Fluorescence Microscopy Techniques
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
- Keywords
- postsynaptic density, AMPA receptors, NMDA receptor, PSD-95, scaffold proteins, excitatory synaptic transmission, synaptic plasticity, postsynaptic currents, photoactivated localization microscopy
- MeSH terms
- Disks Large Homolog 4 Protein, Animals, Hippocampus, Membrane Proteins, Microscopy, Fluorescence, Synaptic Transmission, Neurons, Receptors, AMPA, Excitatory Postsynaptic Potentials, Intracellular Signaling Peptides and Proteins, Nanostructures, Rats, Post-Synaptic Density
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