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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
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Updated: Apr 18, 2026

A High-throughput Calcium-flux Assay to Study NMDA-receptors with Sensitivity to Glycine/D-serine and Glutamate
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Correlating structural and energetic changes in glycine receptor activation.

Suzanne Scott1, Joseph W Lynch2, Angelo Keramidas3

  • 1From the Queensland Brain Institute and.

The Journal of Biological Chemistry
|January 10, 2015
PubMed
Summary

A mutation in glycine receptors enhances activation by altering ion channel gating. This study reveals key energetic pathways in pentameric ligand-gated ion channels, crucial for nervous system function.

Keywords:
Chloride ChannelCys-loop ReceptorEnergeticsIon ChannelPentameric Ligand-gated Ion ChannelReceptor Structure-functionSingle Channel Kinetics

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Biophysics

Background:

  • Pentameric ligand-gated ion channels (pLGICs) are vital for rapid signaling in the nervous system.
  • The precise mechanisms linking ligand binding to receptor activation and ion flow remain incompletely understood.
  • Understanding these mechanisms is critical for deciphering neuronal communication and developing targeted therapeutics.

Purpose of the Study:

  • To investigate the structural and energetic basis by which an M1 domain mutation (α1(Q-26'E)) enhances glycine receptor activation.
  • To correlate mutation-induced changes in receptor activation kinetics and conductance with structural rearrangements.
  • To elucidate the role of specific residues and subunit interfaces in the activation pathway of pLGICs.

Main Methods:

  • Systematic mutation of spatially clustered residues (19' and 24') in the M2 and M2-M3 linker domains of glycine receptors.
  • Electrophysiological recordings to measure single-channel activation durations (cluster durations) and conductance.
  • Determination of interaction coupling energies and correlation with conformational changes observed in pLGIC crystal structures.

Main Results:

  • The α1(Q-26'E) mutation enhanced cluster durations and reduced channel conductance in both homo- and heteromeric glycine receptors.
  • Strong energetic coupling was observed between α1(-26') and α1(19'), suggesting a critical role in receptor activation.
  • Lack of coupling for α1(24') mutations and between α1(-26') and the β subunit indicated distinct roles and subunit dynamics during activation.

Conclusions:

  • The α1(Q-26'E) mutation and its coupling with α1(19') represent a key energetic pathway for glycine receptor activation.
  • Specific subunit interfaces and residue interactions are crucial for transducing ligand binding into channel opening.
  • Findings provide insights into the general activation mechanisms of pLGICs, applicable to other channel families.