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Related Experiment Videos

Postsynaptic density protein-95 regulates NMDA channel gating and surface expression.

Ying Lin1, V Arvydas Skeberdis, Anna Francesconi

  • 1Department of Neuroscience, Albert Einstein College of Medicine, Bronx, New York 10461-1975, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|November 13, 2004
PubMed
Summary

Postsynaptic density protein-95 (PSD-95) enhances N-methyl-D-aspartate receptor (NMDAR) function by increasing surface expression and opening rates. This interaction provides a new pathway for regulating NMDAR activity in the brain.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Synaptic Plasticity

Background:

  • N-methyl-D-aspartate receptors (NMDARs) are crucial for excitatory synaptic transmission.
  • Postsynaptic density protein-95 (PSD-95) is a key scaffolding protein at excitatory synapses.
  • The precise role of PSD-95 in modulating NMDAR function remains incompletely understood.

Purpose of the Study:

  • To investigate how PSD-95 association influences NMDAR channel gating and surface expression.
  • To elucidate the molecular mechanisms underlying PSD-95's effects on NMDARs.

Main Methods:

  • Co-localization studies of NMDARs and PSD-95 at excitatory synapses.
  • Electrophysiological recordings to assess NMDAR channel properties.
  • Analysis of NMDAR surface expression and trafficking dynamics.

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Main Results:

  • PSD-95 association significantly increases the number of functional NMDARs at the cell surface.
  • PSD-95 enhances the channel opening rate of NMDARs without altering conductance or mean open time.
  • PSD-95 modulates NMDAR surface expression by regulating channel insertion and internalization rates.
  • The PDZ binding motif on the NR2 C-terminal tail is essential for PSD-95's effects.

Conclusions:

  • PSD-95 acts as a critical regulator of NMDAR function and surface expression.
  • This interaction suggests a novel mechanism for activity-dependent regulation of NMDARs.
  • Findings highlight the importance of scaffolding proteins in synaptic plasticity and neuronal communication.