Structural requirements for eszopiclone and zolpidem binding to the gamma-aminobutyric acid type-A (GABAA) receptor are different.

Article Details

Citation

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
DrugTargetKindOrganismPharmacological ActionActions
EszopicloneGamma-aminobutyric acid receptor subunit alpha-1ProteinHumans
Yes
Potentiator
Details
EszopicloneGamma-aminobutyric acid receptor subunit alpha-2ProteinHumans
Unknown
Agonist
Details
EszopicloneGamma-aminobutyric acid receptor subunit alpha-3ProteinHumans
Unknown
Agonist
Details
EszopicloneGamma-aminobutyric acid receptor subunit alpha-5ProteinHumans
Unknown
Agonist
Details
ZopicloneGamma-aminobutyric acid receptor subunit alpha-1ProteinHumans
Yes
Potentiator
Details
ZopicloneGamma-aminobutyric acid receptor subunit alpha-2ProteinHumans
Yes
Potentiator
Details
ZopicloneGamma-aminobutyric acid receptor subunit alpha-3ProteinHumans
Yes
Potentiator
Details
ZopicloneGamma-aminobutyric acid receptor subunit alpha-5ProteinHumans
Yes
Potentiator
Details