Cited by 20Neuroscience and Neuropharmacology ResearchAdvanced Electron Microscopy Techniques and ApplicationsReceptor Mechanisms and Signaling

The postsynaptic density in excitatory synapses is composed of clustered, heterogeneous nanoblocks

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Sun, Rong, Allen, James P., Mao, Zhuqing, Wilson, Liana, Haider, Mariam, Alten, Baris, Zhou, Zimeng, Wang, Xinyi +1 more·2025·Journal of Cell Biology

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Abstract

Abstract The nanoscale organization of proteins within synapses is critical for maintaining and regulating synaptic transmission and plasticity. Here, we use cryogenic electron tomography to directly visualize the three-dimensional architecture and supramolecular organization of pre-cleft-postsynaptic components in their near-native cellular context in both synaptosomes from rat hippocampi and synapses from rat primary cultured neurons. High-resolution electron microscopy and quantitative analyses revealed that postsynaptic density (PSD) is composed of membrane-associated nanoblocks of various sizes, which are in close relationship with potential presynaptic release sites through adhesion molecules spanning the synaptic cleft, as well as with post-synaptic receptors. Subtomogram averaging from synaptosomes showed two distinct types of postsynaptic membrane proteins at resolutions of 24 Å and 26 Å respectively. Furthermore, our data reveal that majority of potential release sites and ∼50% subtomogram averaged receptor-like particles are located within the boundary of PSD nanoblocks, while PSD nanoblocks might be redundant for neurotransmission. The results of this study provide a more comprehensive understanding of synaptic ultrastructure and suggest that PSD is composed of clustering of various nanoblocks, which likely underlies the dynamic nature of PSD to modulate synaptic strength.

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Crossref · 10.1083/jcb.202406133

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  • The postsynaptic density (PSD) serves as a protein hub where scaffolds such as PSD-95, shank, homer, and gephyrin anchor excitatory (AMPA, NMDA) and inhibitory (GABA-A, Glycine) receptors.

    “Postsynaptically, the postsynaptic density (PSD) serves as a protein hub where scaffolds such as PSD-95, shank, homer, and gephyrin anchor excitatory (AMPA, NMDA) and inhibitory (GABA-A, Glycine) receptors are observed.”

    From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [36]

    The Introduction describes the PSD at excitatory synapses and identifies PSD95 as a postsynaptic scaffolding protein aligned with clustered AMPA receptors. The Results and discussion mention NMDA receptors only as a possible component of some nanoblocks. Our copy does not support the claimed roles of shank, homer, or gephyrin in anchoring the listed receptors, particularly GABA-A and glycine receptors at inhibitory synapses. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • During a single LTP event, heterogeneity is resolved through rapid structural remodeling where 'nascent zones' are converted into functional active zones within 5 min via recruitment of dense-core vesicles.

    “During a single LTP event, this heterogeneity is resolved through rapid structural remodeling where ‘nascent zones’ are converted into functional active zones within 5 min via the recruitment of dense-core vesicles, representing a high turnover rate of these nanoblocks to saturate potentiation capacity [36,37].”

    From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [36]

    The Results and discussion section reports heterogeneous postsynaptic nanoblocks and possible unoccupied release sites. It does not report a single LTP event, conversion of nascent zones into active zones within 5 minutes, or recruitment of dense-core vesicles; searches for those terms found no supporting passage. Our copy provides no page numbers for these sections. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • Cryo-electron tomography studies have revealed that the PSD is composed of clustered, heterogeneous nanoblocks that vary in size, assembly, and distribution, containing type A (O-shaped) and type B (Y-shaped) receptor-like particles.

    “Cryo-electron tomography studies have revealed that the PSD is not a monolithic structure but is composed of clustered, heterogeneous nanoblocks that vary in size, assembly, and distribution [36]. Nanoblocks contains two specific types of receptor-like particles, type A (O-shaped) and type B (Y-shaped) [36].”

    From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [36]

  • Presynaptic release sites align preferentially with nanoblocks containing A/B particles, while nanoblocks lacking them may serve as spare scaffolds or house other receptors.

    “Presynaptic release sites align preferentially with nanoblocks containing these A/B particles, while nanoblocks lacking them may serve as spare scaffolds or house other receptors [36].”

    From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [36]

  • The postsynaptic density (PSD) is a highly organized, electron-dense protein complex situated directly beneath the postsynaptic membrane of excitatory synapses, typically at the tip of dendritic spines.

    “The postsynaptic density (PSD) is a highly organized, electron-dense protein complex situated directly beneath the postsynaptic membrane of excitatory synapses [36]. This structure, typically found at the tip of dendritic spines, serves as a crucial hub for signal reception, transduction, and synaptic plasticity.”

    From Molecular Physiology of the Neuronal Synapse (2026) · cites this paper as [36]

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Authors
Sun, R., Allen, J. P., Mao, Z., Wilson, L., Haider, M., Alten, B., Zhou, Z., Wang, X., & Zhou, Q.
Affiliations
  • Vanderbilt University (US)
  • Vanderbilt University 4 Department of Pharmacology, , Nashville, TN,
Corresponding author
Zhou, Qiangjun
Venue
Journal of Cell Biology
Published
2025-03-27
Volume
224
Issue
6
ISSN
  • 0021-9525 (ISSN-L)
  • 1540-8140
OpenAlex
W4408908092
Cited by
20
References
95
Citations by year
2026: 14 · 2025: 4 · 2024: 2
FWCI
7.06
Type
journal article
Language
en
Open access
Locations
  • The Journal of Cell Biology (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (R00 MH113764, R01 MH132918, S10 OD030292-01)
  • Vanderbilt Brain Institue (“Neurodegenerative” TIPS Initiative Award)
  • Vanderbilt University
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Structural Biology › Advanced Electron Microscopy Techniques and Applications
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Receptor Mechanisms and Signaling
Keywords
postsynaptic density, excitatory synapses, synaptic ultrastructure, synaptosomes, presynaptic release sites, synaptic plasticity, cryo-electron tomography
MeSH terms
Animals, Cells, Cultured, Synaptic Transmission, Neurons, Synapses, Synaptosomes, Cryoelectron Microscopy, Rats, Electron Microscope Tomography, Post-Synaptic Density

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