NMDAR-Activated PP1 Dephosphorylates GluN2B to Modulate NMDAR Synaptic Content

Cell Rep. 2019 Jul 9;28(2):332-341.e5. doi: 10.1016/j.celrep.2019.06.030.


In mature neurons, postsynaptic N-methyl-D-aspartate receptors (NMDARs) are segregated into two populations, synaptic and extrasynaptic, which differ in localization, function, and associated intracellular cascades. These two pools are connected via lateral diffusion, and receptor exchange between them modulates synaptic NMDAR content. Here, we identify the phosphorylation of the PDZ-ligand of the GluN2B subunit of NMDARs (at S1480) as a critical determinant in dynamically controlling NMDAR synaptic content. We find that phosphorylation of GluN2B at S1480 maintains NMDARs at extrasynaptic membranes as part of a protein complex containing protein phosphatase 1 (PP1). Global activation of NMDARs leads to the activation of PP1, which mediates dephosphorylation of GluN2B at S1480 to promote an increase in synaptic NMDAR content. Thus, PP1-mediated dephosphorylation of the GluN2B PDZ-ligand modulates the synaptic expression of NMDARs in mature neurons in an activity-dependent manner, a process with profound consequences for synaptic and structural plasticity, metaplasticity, and synaptic neurotransmission.

Keywords: GluN2B; NMDA receptors; NMDAR synaptic content; PP1; dephosphorylation; extrasynaptic NMDAR.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Animals
  • Cells, Cultured
  • Female
  • Ligands
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Neurons / metabolism
  • PDZ Domains
  • Phosphorylation
  • Protein Phosphatase 1 / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, N-Methyl-D-Aspartate / genetics
  • Receptors, N-Methyl-D-Aspartate / metabolism*
  • Synapses / metabolism*


  • Ligands
  • NR2B NMDA receptor
  • Receptors, N-Methyl-D-Aspartate
  • Protein Phosphatase 1