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A rapid fluorogenic GPCR-β-arrestin interaction assay.

Qiang Zhang1,2, Yao-Wu Zheng2, Shaun R Coughlin2

  • 1Department of Pharmaceutical Chemistry, University of California-San Francisco, San Francisco, California.

Protein Science : a Publication of the Protein Society
|February 8, 2018
PubMed
Summary
This summary is machine-generated.

We developed a new fluorogenic assay to detect interactions between G protein-coupled receptors (GPCRs) and β-arrestin in real-time. This genetically encoded assay is highly sensitive and applicable to various GPCRs for studying signal transduction.

Keywords:
G protein coupled receptorfluorescent reportergreen fluorescent proteinprotein-protein interaction

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Protein-protein interactions are crucial for cellular signal transduction.
  • Detecting these interactions in live systems is vital for understanding cellular mechanisms.
  • Current methods for studying G protein-coupled receptor (GPCR) activation have limitations.

Purpose of the Study:

  • To develop a novel, genetically encoded fluorogenic assay for detecting GPCR-β-arrestin interactions in live cells.
  • To characterize the assay's performance and applicability to different GPCRs.
  • To provide a sensitive and high signal-to-noise method for studying GPCR activation.

Main Methods:

  • A fluorogenic assay was genetically encoded to detect GPCR-β-arrestin interactions.
  • The assay relies on the interaction of components upon GPCR activation, leading to fluorescence.
  • Protease-activated receptor-1 (PAR1) was used to validate the assay's functionality.

Main Results:

  • The assay demonstrated high signal-to-noise, with fluorescence absent until GPCR activation.
  • Fluorescence was detected within minutes of protease-activated receptor-1 activation.
  • The interaction required specific serine-threonine residues in the receptor carboxyl tail, confirming a known mechanism.

Conclusions:

  • The developed fluorogenic assay is a sensitive and versatile tool for detecting GPCR-β-arrestin interactions in live cells.
  • This assay complements existing in vivo methods for assessing GPCR activation.
  • The findings support the classical GPCR kinase-dependent β-arrestin recruitment mechanism.