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Updated: Jun 29, 2025

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission

Methods for the Discovery of Novel Compounds Modulating a Gamma-Aminobutyric Acid Receptor Type A Neurotransmission

Published on: August 16, 2018

Mechanistic insights into sodium ion-mediated ligand binding affinity and modulation of 5-HT2B GPCR activity:

Arushi Chauhan¹, Jitender Singh¹, Namrata Sangwan¹

¹Department of Biophysics, Postgraduate Institute of Medical Education and Research, Chandigarh, India.

Journal of Receptor and Signal Transduction Research

|March 26, 2024

Abstract

Purpose:

The G-protein coupled receptor (GPCR) family, implicated in neurological disorders and drug targets, includes the sensitive serotonin receptor subtype, 5-HT2B. The influence of sodium ions on ligand binding at the receptor's allosteric region is being increasingly studied for its impact on receptor structure.

Methods:

High-throughput virtual screening of three libraries, specifically the Asinex-GPCR library, which contains 8,532 compounds and FDA-approved (2466 compounds) and investigational compounds (2731)) against the modeled receptor [4IB4-5HT_2BR_M] using the standard agonist/antagonist (Ergotamine/Methysergide), as previously selected from our studies based on ADMET profiling, and further on basis of binding free energy a single compound - dihydroergotamine is chosen.

Results:

This compound displayed strong interactions with the conserved active site. Ions influence ligand binding, with stronger interactions (3-H-bonds and 1-π-bond around 3.35 Å) observed when an agonist and ions are present. Ions entry is guided by conserved motifs in helices III, IV, and VII, which regulate the receptor. Dihydroergotamine, the selected drug, showed binding variance based on ions presence/absence, affecting amino acid residues in these motifs. DCCM and PCA confirmed the stabilization of ligands, with a greater correlation (∼46.6%-PC1) observed with ions. Dihydroergotamine-modified interaction sites within the receptor necessary for activation, serving as a potential 5HT_2BR_M agonist. RDF analysis showed the sodium ions density around the active site during dihydroergotamine binding.

Conclusion:

Our study provides insights into sodium ion mobility's role in controlling ligand binding affinity in 5HT_2BR, offering therapeutic development insights.

Keywords:

5HT2BR G-protein-coupled receptors (GPCRs)allosteric site conserved motifs sodium ions

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