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Quantifying Agonist Activity at G Protein-coupled Receptors
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Published on: December 26, 2011

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Distinct G protein-coupled receptor phosphorylation motifs modulate arrestin affinity and activation and global

Daniel Mayer1,2,3, Fred F Damberger4, Mamidi Samarasimhareddy5

  • 1Laboratory of Biomolecular Research, Paul Scherrer Institute, 5232, Villigen, Switzerland. damayer@ucsd.edu.

Nature Communications
|March 21, 2019
PubMed

Insights

Phosphorylation patterns on G protein-coupled receptors (GPCRs) dictate arrestin function. This study identifies distinct phosphorylation sites that are key for arrestin binding, inhibitory to it, or modulate arrestin conformation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Arrestin binding to G protein-coupled receptors (GPCRs) is crucial for cellular signaling.
  • The specific phosphorylation patterns on GPCRs influence arrestin binding and function.
  • The precise role of individual phosphorylation sites on GPCRs remains largely unknown.

Purpose of the Study:

  • To elucidate the functional significance of individual phosphorylation sites on GPCRs in regulating arrestin interaction.
  • To categorize phosphorylation sites based on their impact on arrestin binding and activation.
  • To understand how GPCR phosphorylation patterns control arrestin-mediated cellular functions.

Main Methods:

  • Utilized a library of synthetic phosphopeptide analogues of the rhodopsin C-terminus.
  • Employed biochemical and biophysical assays to assess arrestin binding and activation.
  • Applied nuclear magnetic resonance (NMR) spectroscopy to characterize arrestin-1 conformational changes.

Main Results:

  • Identified distinct functional classes of GPCR phosphorylation sites.
  • 'Key sites' are essential for arrestin binding and activation.
  • An 'inhibitory site' was found to prevent arrestin binding, while 'modulator sites' influence arrestin conformation.

Conclusions:

  • GPCR phosphorylation sites can be functionally categorized, impacting arrestin interaction differently.
  • This classification provides a framework for understanding how diverse GPCR phosphorylation patterns regulate arrestin activity.
  • Findings advance the comprehension of arrestin-mediated signaling pathways in cellular processes.

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