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Structural and molecular determinants regulating mGluR5 surface expression.

Kai Chang1, Katherine W Roche1

  • 1Receptor Biology Section, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Building 35, Room 2C903, Bethesda, MD 20892, USA.

Neuropharmacology
|May 24, 2016
PubMed
Summary
This summary is machine-generated.

The 7th transmembrane domain (TM7) is critical for metabotropic glutamate receptor 5 (mGluR5) surface expression. Ligand binding mutations impair mGluR5 surface expression and dimerization, highlighting multiple domain regulation.

Keywords:
DimerizationGPCRLigand bindingMembrane traffickingMetabotropic glutamate receptorTruncationmGluR5

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • G protein-coupled receptors (GPCRs) trafficking is vital for cellular function.
  • Metabotropic glutamate receptors (mGluRs) modulate CNS synaptic transmission and plasticity.
  • Group I mGluRs, like mGluR5, possess C-terminal tails involved in protein interactions and ER retention.

Purpose of the Study:

  • Investigate structural determinants of mGluR5 trafficking to the plasma membrane.
  • Analyze the role of truncations and ligand-binding mutations in mGluR5 surface expression.
  • Evaluate mGluR5 dimerization and surface expression using an ECD-based assay.

Main Methods:

  • Studied mGluR5 truncations and ligand-binding mutants.
  • Developed an extracellular domain (ECD)-based surface-binding assay for dimerization.
  • Assessed surface expression in heterologous cells and neurons.

Main Results:

  • The C terminus is not essential for mGluR5 surface expression.
  • The 7th transmembrane domain (TM7) is critical for mGluR5 surface expression.
  • Ligand-binding mutations (Y64A/T174A) impair mGluR5 surface expression and dimerization.
  • 7TM domain and C-terminal tail integrity are important for ECD dimerization.

Conclusions:

  • Multiple domains, including TM7 and the ECD, regulate mGluR5 trafficking and dimerization.
  • Ligand binding is crucial for proper mGluR5 surface expression and dimerization in neurons.