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Related Concept Videos

Ligand-Gated Ion Channel Receptor: Gating Mechanism01:30

Ligand-Gated Ion Channel Receptor: Gating Mechanism

Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Ligand-gated ion channels are transmembrane proteins with a channel for ions to pass through and a binding site for a ligand. The channel opens only when a ligand attaches to the binding site.
Three Subfamilies of Ligand-gated Ion Channels
Ligand-gated ion channels fall into three subfamilies. The 'Cys-loop' includes the nicotinic acetylcholine receptors, γ-aminobutyric acid (GABA), glycine, and 5-hydroxytryptamine receptors. The second one is the 'Pore-loop' channels that include the...
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Allosteric Regulation

Allosteric regulation of enzymes occurs when the binding of an effector molecule to a site that is different from the active site causes a change in the enzymatic activity. This alternate site is called an allosteric site, and an enzyme can contain more than one of these sites. Allosteric regulation can either be positive or negative, resulting in an increase or decrease in enzyme activity. Most enzymes that display allosteric regulation are metabolic enzymes involved in the degradation or...
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When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...
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Targeting AMPA receptor gating processes with allosteric modulators and mutations.

Nicholas A Mitchell1, Mark W Fleck

  • 1Center for Neuropharmacology & Neuroscience, Albany Medical College, Albany, New York 12208, USA.

Biophysical Journal
|January 9, 2007
PubMed
Summary

Allosteric modulators and mutations affecting AMPA receptor (AMPAR) desensitization also impact deactivation and potency. These effects are independent of desensitization, revealing distinct molecular targets for AMPAR function.

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Last Updated: Jul 17, 2026

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission
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Published on: January 28, 2019

Area of Science:

  • Neuroscience
  • Molecular Pharmacology

Background:

  • Allosteric modulators and specific mutations can alter AMPA receptor (AMPAR) desensitization.
  • It remains unclear if observed changes in deactivation and agonist potency are direct consequences of slowed desensitization or independent effects.

Purpose of the Study:

  • To investigate whether the effects of allosteric modulators and mutations on AMPAR deactivation and agonist potency are independent of their impact on desensitization.
  • To elucidate the distinct mechanisms underlying these AMPAR kinetic properties.

Main Methods:

  • Utilized patch-clamp electrophysiology with ultrafast perfusion to record from wild-type GluR1 and a nondesensitizing GluR1-L497Y mutant receptor.
  • Compared the effects of cyclothiazide (CTZ), trichlormethiazide (TCM), and CX614 on AMPAR desensitization, deactivation, and glutamate EC50.

Main Results:

  • CTZ, TCM, and the L497Y mutation significantly reduced GluR1 desensitization.
  • L497Y mutation had a greater impact on deactivation and EC50 than modulators; CTZ/TCM paradoxically altered deactivation and EC50 in L/Y mutants.
  • CX614 slowed desensitization and deactivation without altering EC50 in both wild-type and L/Y receptors.
  • S750Q mutations abolished CTZ/TCM effects but not CX614, and restored L/Y deactivation/EC50 without restoring desensitization.

Conclusions:

  • CTZ and TCM modulate AMPAR deactivation and agonist potency independently of desensitization, likely via altered agonist dissociation (koff).
  • CX614 affects desensitization and deactivation independently of agonist potency.
  • Mutagenesis and allosteric modulators can independently target AMPAR desensitization, deactivation, and agonist potency, highlighting complex regulatory mechanisms.