Structural requirements for eszopiclone and zolpidem binding to the gamma-aminobutyric acid type-A (GABAA) receptor are different.
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Hanson SM, Morlock EV, Satyshur KA, Czajkowski C
Structural requirements for eszopiclone and zolpidem binding to the gamma-aminobutyric acid type-A (GABAA) receptor are different.
J Med Chem. 2008 Nov 27;51(22):7243-52. doi: 10.1021/jm800889m.
- PubMed ID
- 18973287 [ View in PubMed]
- Abstract
The sleep-aids zolpidem and eszopiclone exert their effects by binding to and modulating gamma-aminobutyric acid type-A receptors (GABA(A)Rs), but little is known about the structural requirements for their actions. We made 24 cysteine mutations in the benzodiazepine (BZD) binding site of alpha(1)beta(2)gamma(2) GABA(A)Rs and measured zolpidem, eszopiclone, and BZD-site antagonist binding. Mutations in gamma(2)loop D and alpha(1)loops A and B altered the affinity of all ligands tested, indicating that these loops are important for BZD pocket structural integrity. In contrast, gamma(2)loop E and alpha(1)loop C mutations differentially affected ligand affinity, suggesting that these loops are important for ligand selectivity. In agreement with our mutagenesis data, eszopiclone docking yielded a single model stabilized by several hydrogen bonds. Zolpidem docking yielded three equally populated orientations with few polar interactions, suggesting that unlike eszopiclone, zolpidem relies more on shape recognition of the binding pocket than on specific residue interactions and may explain why zolpidem is highly alpha(1)- and gamma(2)-subunit selective.
DrugBank Data that Cites this Article
- Drugs
- Drug Targets
Drug Target Kind Organism Pharmacological Action Actions Eszopiclone Gamma-aminobutyric acid receptor subunit alpha-1 Protein Humans YesPotentiatorDetails Eszopiclone Gamma-aminobutyric acid receptor subunit alpha-2 Protein Humans UnknownAgonistDetails Eszopiclone Gamma-aminobutyric acid receptor subunit alpha-3 Protein Humans UnknownAgonistDetails Eszopiclone Gamma-aminobutyric acid receptor subunit alpha-5 Protein Humans UnknownAgonistDetails Zopiclone Gamma-aminobutyric acid receptor subunit alpha-1 Protein Humans YesPotentiatorDetails Zopiclone Gamma-aminobutyric acid receptor subunit alpha-2 Protein Humans YesPotentiatorDetails Zopiclone Gamma-aminobutyric acid receptor subunit alpha-3 Protein Humans YesPotentiatorDetails Zopiclone Gamma-aminobutyric acid receptor subunit alpha-5 Protein Humans YesPotentiatorDetails