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Nanoluciferase-Based Complementation Assay to Detect GPCR-G Protein Interaction.

Céline Laschet1, Julien Hanson2,3

  • 1Laboratory of Molecular Pharmacology, GIGA-Molecular Biology of Diseases, University of Liège, Liège, Belgium.

Methods in Molecular Biology (Clifton, N.J.)
|June 4, 2021
PubMed
Summary

Discovering drugs that target G protein-coupled receptors (GPCRs) is crucial. This study introduces a new method to directly detect GPCR-G protein interactions, aiding the development of biased signaling drugs with fewer side effects.

Keywords:
Biased signalingComplementationFunctional selectivityG proteinGPCRNanoBitNanoluciferase

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Area of Science:

  • Biochemistry
  • Pharmacology
  • Molecular Biology

Background:

  • G protein-coupled receptors (GPCRs) are key drug targets, with ~30% of marketed drugs acting on them.
  • Detecting ligands with specific pharmacological profiles is vital for GPCR drug discovery.
  • GPCR ligands can induce functional selectivity (biased signaling), potentially leading to improved drugs with fewer side effects.

Purpose of the Study:

  • To develop a method for directly assessing receptor-G protein interactions.
  • To enable the profiling of receptors and ligands for specific G protein interactions.
  • To facilitate the discovery of biased ligands for GPCRs.

Main Methods:

  • A novel assay was developed to directly measure the interaction between GPCRs and G proteins.
  • The method allows for the profiling of receptor-ligand interactions concerning specific G protein coupling.
  • The assay is designed for compatibility with high-throughput screening (HTS).

Main Results:

  • The presented method directly assesses GPCR-G protein interactions, unlike traditional second messenger assays.
  • This approach enables the characterization of functional selectivity by monitoring specific GPCR-G protein engagement.
  • The method is suitable for screening large compound libraries for biased GPCR ligands.

Conclusions:

  • A direct GPCR-G protein interaction assay provides a valuable tool for drug discovery.
  • This method supports the identification of biased ligands, advancing the field of functional selectivity.
  • The assay's HTS compatibility accelerates the search for novel GPCR-targeted therapeutics.