Journal
BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH
Volume 1868, Issue 3, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.bbamcr.2020.118930
Keywords
BRET; Fluorescence anisotropy; Ligand binding; G protein-coupled receptor; M-2 muscarinic acetylcholine receptor; Fluorescent ligands
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG) [GRK1910]
- Estonian Ministry of Education and Science [IUT20-17, PSG230]
- NATO [SPS 985261]
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This study compared BRET and FA fluorescence techniques in the characterization of ligand binding to GPCRs, using M2R and TAMRA-labeled ligands as a model system. The results showed that both methods yielded consistent affinities with radioligand competition binding experiments and provided real-time kinetic binding data. Additionally, the study demonstrated that BRET and FA assays can serve as valuable alternatives to radioactivity-based methods for screening purposes and for a precise characterization of binding kinetics.
BRET and fluorescence anisotropy (FA) are two fluorescence-based techniques used for the characterization of ligand binding to G protein-coupled receptors (GPCRs) and both allow monitoring of ligand binding in real time. In this study, we present the first direct comparison of BRET-based and FA-based binding assays using the human M-2 muscarinic acetylcholine receptor (M2R) and two TAMRA (5-carboxytetramethylrhodamine)-labeled fluorescent ligands as a model system. The determined fluorescent ligand affinities from both assays were in good agreement with results obtained from radioligand competition binding experiments. The assays yielded real-time kinetic binding data revealing differences in the mechanism of binding for the investigated fluorescent probes. Furthermore, the investigation of various unlabeled M2R ligands yielded pharmacological profiles in accordance with earlier reported data. Taken together, this study showed that BRET- and FA-based binding assays represent valuable alternatives to radioactivity-based methods for screening purposes and for a precise characterization of binding kinetics supporting the exploration of binding mechanisms.
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