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Subsynaptic positioning of AMPARs by LRRTM2 controls synaptic strength.

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Synaptic adhesion molecules like LRRTM2 rapidly position glutamate receptors (AMPARs) to control neuronal communication strength. This positioning, not just receptor number, is key for dynamic synaptic function.

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Nano-organization of synaptic proteins influences neuronal communication strength.
  • Subsynaptic distribution of glutamate receptors (AMPARs) supports this hypothesis.
  • Mechanisms controlling subsynaptic organization are largely unknown.

Purpose of the Study:

  • To investigate the role of transcellular interactions in positioning AMPA receptors (AMPARs).
  • To test if the adhesion molecule LRRTM2 controls AMPAR subsynaptic organization and synaptic function.

Main Methods:

  • Targeted engineered rapid proteolysis of the LRRTM2 extracellular domain.
  • Observed nanoscale declustering of AMPARs and their subsequent escape from synapses.
  • Measured postsynaptic receptor activation (evoked and spontaneous).

Main Results:

  • Severing LRRTM2 rapidly caused nanoscale declustering of AMPARs away from release sites.
  • AMPARs escaped synapses significantly later than their declustering.
  • Rapid repositioning of AMPARs led to deficits in evoked, but not spontaneous, postsynaptic activation.

Conclusions:

  • Synaptic function is determined by both receptor number and nanopositioning.
  • Adhesion molecules like LRRTM2 acutely position receptors to dynamically control synaptic strength.
  • This study dissociates receptor numbers from nanopositioning in synaptic function determination.