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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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CaMKIIα-driven, phosphatase-checked postsynaptic plasticity via phase separation.

Qixu Cai1, Menglong Zeng1,2, Xiandeng Wu1

  • 1Division of Life Science, State Key Laboratory of Molecular Neuroscience, Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.

Cell Research
|November 25, 2020
PubMed
Summary
This summary is machine-generated.

Shank3 binds to Ca2+/calmodulin-dependent kinase IIα (CaMKIIα), regulating its synaptic recruitment and activity. This interaction controls postsynaptic density assembly and structural long-term potentiation (LTP), crucial for learning and memory.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • Ca2+/calmodulin-dependent kinase IIα (CaMKIIα) is vital for synaptic plasticity and learning.
  • Its precise function in synapses is still under active investigation.
  • Understanding CaMKIIα regulation is key to deciphering learning mechanisms.

Purpose of the Study:

  • To identify novel binding partners of CaMKIIα.
  • To elucidate the regulatory mechanisms of CaMKIIα at the postsynaptic density (PSD).
  • To investigate the role of CaMKIIα dynamics in synaptic plasticity.

Main Methods:

  • Co-immunoprecipitation to identify binding partners.
  • Förster resonance energy transfer (FRET) and super-resolution microscopy to visualize protein interactions and dynamics.
  • Biochemical assays to study enzyme activity and protein complex formation.
  • Electrophysiology to assess synaptic plasticity.

Main Results:

  • Shank3 identified as a specific binding partner for autoinhibited CaMKIIα.
  • CaMKIIα dynamically shuttles between Shank3 and GluN2B subcompartments within the PSD.
  • Ca2+ influx and phosphatases regulate CaMKIIα binding and activity, controlling PSD condensate formation.
  • CaMKIIα activation leads to PSD enlargement and structural long-term potentiation (LTP).

Conclusions:

  • Shank3 acts as a scaffold, recruiting autoinhibited CaMKIIα to the PSD via phase separation.
  • Ca2+-dependent, phosphatase-regulated shuttling of CaMKIIα controls PSD assembly and synaptic plasticity.
  • This mechanism provides new insights into how CaMKIIα decodes Ca2+ signals to modulate synaptic function and learning.