Cited by 126Neuroscience and Neuropharmacology ResearchGenetics and Neurodevelopmental DisordersUbiquitin and proteasome pathways

GKAP orchestrates activity-dependent postsynaptic protein remodeling and homeostatic scaling

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Shin, Seung Min, Zhang, Nanyan, Hansen, Jonathan, Gerges, Nashaat Z, Pak, Daniel T S, Sheng, Morgan, Lee, Sang H·2012·Nature Neuroscience

Abstract

How does chronic activity modulation lead to global remodeling of proteins at synapses and synaptic scaling? Here we report that guanylate kinase-associated protein (GKAP; also known as SAPAP), a scaffolding molecule linking NMDA receptor-PSD-95 to Shank-Homer complexes, acts in these processes. Overexcitation removes GKAP from synapses via the ubiquitin-proteasome system, whereas inactivity induces synaptic accumulation of GKAP in rat hippocampal neurons. Bidirectional changes in synaptic GKAP amounts are controlled by specific CaMKII isoforms coupled to different Ca(2+) channels. CaMKIIα activated by the NMDA receptor phosphorylates GKAP Ser54 to induce polyubiquitination of GKAP. In contrast, CaMKIIβ activation via L-type voltage-dependent calcium channels promotes GKAP recruitment by phosphorylating GKAP Ser340 and Ser384, which uncouples GKAP from myosin Va motor complex. Overexpressing GKAP turnover mutants not only hampers activity-dependent remodeling of PSD-95 and Shank but also blocks bidirectional synaptic scaling. Therefore, activity-dependent turnover of PSD proteins orchestrated by GKAP is critical for homeostatic plasticity.

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  • When Ca2+ is high, activated βCaMKII can participate in SAPAP trafficking and increase AMPAR incorporation, enabling spine remodeling and synaptic strengthening.

    “In contrast, when Ca2+ is high, activated βCaMKII can participate in SAPAP trafficking and increase incorporation of AMPARs, enabling spine remodeling and synaptic strengthening (Shin et al., 2012).”

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Authors
Shin, S. M., Zhang, N., Hansen, J., Gerges, N. Z., Pak, D. T. S., Sheng, M., & Lee, S. H.
Affiliations
  • Medical College of Wisconsin (US)
  • Georgetown University Medical Center (US)
  • Genentech (US)
Corresponding author
Lee, Sang H
Venue
Nature Neuroscience
Published
2012-11-11
Volume
15
Issue
12
Pages
1655-1666
ISSN
  • 1097-6256 (ISSN-L)
  • 1546-1726
OpenAlex
W2079052947
Cited by
126
References
51
Citations by year
2026: 3 · 2025: 5 · 2024: 4 · 2023: 5 · 2022: 12 · 2021: 11 · 2020: 7 · 2019: 8 · 2018: 12 · 2017: 9 · 2016: 9 · 2015: 13 · 2014: 17 · 2013: 10
FWCI
5.27
Type
journal article
Language
en
Open access
Locations
  • Nature Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-sa)
Funders
  • National Institute on Aging (R01AG032320)
  • National Institute of Mental Health (R01MH078135)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetics and Neurodevelopmental Disorders
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
Keywords
GKAP, postsynaptic density, synaptic scaling, homeostatic plasticity, CaMKII, NMDA receptor, L-type calcium channels, ubiquitin-proteasome system, protein turnover, PSD-95, shank, Homer, myosin Va, hippocampal neurons
MeSH terms
SAP90-PSD95 Associated Proteins, Disks Large Homolog 4 Protein, Animals, Cells, Cultured, Chlorocebus aethiops, Double-Blind Method, Enzyme Activation, Homeostasis, Membrane Proteins, Nerve Tissue Proteins, Neuronal Plasticity, Synapses, COS Cells, Guanine Nucleotide Exchange Factors, Intracellular Signaling Peptides and Proteins, Rats, Synaptic Potentials

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