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Updated: May 17, 2026

Monitoring GPCR-&#946;-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
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Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery

Published on: June 28, 2019

Intrinsic conformational equilibria position arrestin-2 for activation.

Tucker J Shriver1, Kerem Kahraman1, Mingzhe Pan2

  • 1Department of Pharmacology, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.

Protein Science : a Publication of the Protein Society
|May 15, 2026
PubMed
Summary
This summary is machine-generated.

Arrestin-2 intrinsically adopts conformations mirroring G protein-coupled receptor (GPCR) activation steps, even without binding partners. This pre-organized scaffold explains arrestin pre-activation dynamics in solution.

Keywords:
GPCR signaling adaptorbeta‐arrestinconformational equilibriadynamicsinterdomain rotationpre‐activationthermodynamics of activation

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Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay

Published on: March 10, 2020

Area of Science:

  • Molecular and Structural Biology
  • Biochemistry
  • Cell Signaling

Background:

  • Arrestins (arrestin-2) are key regulators of G protein-coupled receptor (GPCR) signaling, mediating receptor desensitization and internalization.
  • Arrestin activation involves large conformational changes, but the pre-activation conformational equilibria in solution are not well understood.
  • Previous studies identified minor conformational states but could not link them to activation due to signal broadening upon receptor binding.

Purpose of the Study:

  • To characterize the intrinsic conformational landscape of full-length human arrestin-2 in solution.
  • To identify pre-existing conformational equilibria that precede receptor binding and activation.
  • To provide a solution-state framework for understanding arrestin pre-activation dynamics.

Main Methods:

  • Multinuclear NMR spectroscopy was employed to study the conformational dynamics of arrestin-2.
  • Dynamic analyses, including backbone relaxation measurements, were used to probe conformational exchange on various timescales (μs-ms).

Main Results:

  • Two distinct pre-existing conformational equilibria were identified in arrestin-2 solution states.
  • A slow exchange equilibrium populates a receptor-bound-like, interdomain-twisted conformation at physiological temperatures.
  • A faster equilibrium populates a state consistent with C-terminal tail release, indicating arrestin-2 acts as a preorganized scaffold intrinsically sampling relevant conformations.

Conclusions:

  • Arrestin-2 exists as a preorganized scaffold that intrinsically samples conformations relevant to receptor binding in the absence of ligands.
  • These findings provide a solution-state model for arrestin pre-activation.
  • This study establishes a dynamic fingerprint for future investigations into ligand-dependent arrestin activation.