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Updated: Jun 2, 2026

Enrichment of Mammalian Tissues and Xenopus Oocytes with Cholesterol
Published on: March 25, 2020
Cholesterol-induced conformational changes in the oxytocin receptor
Sabine Muth1, Anja Fries, Gerald Gimpl
1Department of Biochemistry, Institute of Pharmacy and Biochemistry, Gutenberg-University Mainz, Johann-Joachim Becherweg 30, D-55128 Mainz, Germany.
Cholesterol binding affects G-protein-coupled receptors (GPCRs). This study shows cholesterol alters oxytocin receptor (OTR) dynamics, leading to a more compact receptor state by changing ligand orientation and distance.
Area of Science:
- Biochemistry
- Molecular Biology
- Pharmacology
Background:
- Cholesterol interactions are increasingly recognized for G-protein-coupled receptors (GPCRs).
- The oxytocin receptor (OTR) is a key GPCR known to interact with cholesterol.
Purpose of the Study:
- To investigate cholesterol-induced conformational changes in the OTR.
- To characterize how cholesterol affects OTR function and ligand binding dynamics.
Main Methods:
- Construction of recombinant OTRs with dual fluorescence-labeled ligand binding sites (antagonist and α-BTB).
- Utilized fluorescence spectroscopy techniques including quenching, anisotropy, and energy transfer.
- Monitored receptor states under varying cholesterol concentrations.
Main Results:
- Cholesterol did not significantly alter the molecular environment of the fluorophores.
- Cholesterol influenced the dynamics and orientation of the OTR antagonist ligand.
- Increased cholesterol concentration enhanced energy transfer efficiency between ligands, indicating decreased distance.
Conclusions:
- Cholesterol binding induces a more compact state in the oxytocin receptor.
- These findings suggest cholesterol plays a role in modulating GPCR conformation and dynamics.
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