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Related Concept Videos

Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high affinity and are together...
GPCR Desensitization01:12

GPCR Desensitization

G protein-coupled receptor (GPCR) signaling plays a crucial role in cell functioning. GPCR desensitization is an equally essential process. It allows cells to respond to changing environments and regain sensitivity to new stimuli while preventing unnecessary stimulation when no longer needed. Prolonged exposure to stimuli leads to GPCR desensitization. It involves blocking the receptors from binding and activating additional G proteins. This inhibits activation of downstream effectors, thereby...
G-protein Coupled Receptors01:21

G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
G-protein Coupled Receptors01:21

G-protein Coupled Receptors

G-protein coupled receptors are ligand binding receptors that indirectly affect changes in the cell. The actual receptor is a single polypeptide that transverses the cell membrane seven times creating intracellular and extracellular loops. The extracellular loops create a ligand specific pocket which binds to neurotransmitters or hormones. The intracellular loops holds onto the G-protein.
GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

Some GPCRs transmit signals through adenylyl cyclase (AC), a transmembrane enzyme. AC helps synthesize second messenger cyclic adenosine monophosphate (cAMP). AC catalyzes cyclization reaction and converts ATP to cAMP by releasing a pyrophosphate. The pyrophosphate is further hydrolyzed to phosphate by the enzyme pyrophosphatase, which drives cAMP synthesis to completion. However, cAMP is rapidly degraded to 5′ AMP by the enzymes phosphodiesterase (PDE), preventing overstimulation of cells.
Two...
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

GPCRs are primarily responsible for our sense of smell, taste, and vision.  The binding of a sensory stimulus activates GPCR to stimulate effector proteins, many of which are ion channels in the sensory organs. GPCRs modulate the opening and closing of the target ion channels either directly by binding them, or by releasing second messengers that activate these channels. As ions move across the membrane, the membrane potential is altered, which induces an appropriate response.
Sensory organs,...

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Related Experiment Video

Updated: May 29, 2026

Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay
09:03

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

Published on: March 10, 2020

β-Arrestin condensates regulate G-protein-coupled receptor function.

Preston J Anderson1,2, Peng Xiao3,4, Ya-Ni Zhong5

  • 1Cell and Molecular Biology, Duke University, Durham, NC, USA.

Nature
|May 27, 2026
PubMed
Summary
This summary is machine-generated.

Beta-arrestins (β-arrestins) form liquid-like condensates to regulate G-protein-coupled receptor (GPCR) signaling and internalization. This discovery reveals a new mechanism for controlling cellular communication and drug targets.

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Monitoring GPCR-β-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

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
10:13

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

Published on: June 9, 2017

Related Experiment Videos

Last Updated: May 29, 2026

Parallel Interrogation of β-Arrestin2 Recruitment for Ligand Screening on a GPCR-Wide Scale using PRESTO-Tango Assay
09:03

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

Published on: March 10, 2020

Monitoring GPCR-β-arrestin1/2 Interactions in Real Time Living Systems to Accelerate Drug Discovery
08:21

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

Published on: June 28, 2019

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding
10:13

Measuring G-protein-coupled Receptor Signaling via Radio-labeled GTP Binding

Published on: June 9, 2017

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pharmacology

Background:

  • Beta-arrestins (β-arrestins) are key adaptor proteins regulating G-protein-coupled receptor (GPCR) signaling.
  • GPCRs are the largest receptor class, impacting physiology and serving as common drug targets.
  • The precise mechanisms by which β-arrestins mediate diverse GPCR functions remain incompletely understood.

Purpose of the Study:

  • To investigate the role of β-arrestin behavior in regulating GPCR function.
  • To determine if β-arrestins undergo liquid-liquid phase separation (LLPS).
  • To elucidate how β-arrestin condensation influences GPCR internalization and signaling.

Main Methods:

  • Studied β-arrestin 1 and 2 behavior in proximity to GPCRs.
  • Investigated the phenomenon of liquid-liquid phase separation (LLPS) in arrestin proteins.
  • Analyzed β-arrestin oligomerization and its impact on GPCR functions.

Main Results:

  • Demonstrated that β-arrestins undergo liquid-liquid phase separation, forming functional condensates.
  • Showed this condensation is specific to visual arrestins and β-arrestins.
  • Confirmed β-arrestin oligomerization near GPCRs regulates receptor internalization and signaling.

Conclusions:

  • β-arrestin condensates represent a novel paradigm for regulating GPCR function.
  • Liquid-liquid phase separation by β-arrestins is crucial for compartmentalizing GPCR signaling.
  • This mechanism offers new insights into GPCR modulation and drug development.