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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...
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.
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
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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...
Amplifying Signals via Enzymatic Cascade01:22

Amplifying Signals via Enzymatic Cascade

When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...

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Related Experiment Video

Updated: Jul 13, 2026

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

Monitoring interactions between G-protein-coupled receptors and beta-arrestins.

K D G Pfleger1, M B Dalrymple, J R Dromey

  • 17TM Laboratory/Laboratory for Molecular Endocrinology, Western Australian Institute for Medical Research (WAIMR) and Centre for Medical Research, University of Western Australia, Nedlands, Perth, WA 6009, Australia. kpfleger@waimr.uwa.edu.au

Biochemical Society Transactions
|July 20, 2007
PubMed
Summary

Beta-arrestins are key proteins in G-protein-coupled receptor (GPCR) signaling. New BRET technology allows real-time tracking of GPCR-beta-arrestin interactions, advancing our understanding of their complex roles.

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Real-time Imaging of Leukotriene B4 Mediated Cell Migration and BLT1 Interactions with β-arrestin

Published on: December 23, 2010

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Last Updated: Jul 13, 2026

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

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

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Real-time Imaging of Leukotriene B4 Mediated Cell Migration and BLT1 Interactions with β-arrestin
13:45

Real-time Imaging of Leukotriene B4 Mediated Cell Migration and BLT1 Interactions with β-arrestin

Published on: December 23, 2010

Area of Science:

  • Cellular Biology
  • Molecular Pharmacology
  • Biochemistry

Background:

  • Beta-arrestins 1 and 2 are crucial intracellular adaptor proteins involved in G-protein-coupled receptor (GPCR) regulation.
  • Their functions encompass GPCR desensitization, internalization, trafficking, and G-protein-independent signaling pathways.

Purpose of the Study:

  • To highlight recent advancements in BRET technology for studying GPCR-beta-arrestin dynamics.
  • To emphasize the utility of combined experimental approaches for elucidating beta-arrestin functions in GPCR mediation.

Main Methods:

  • Bioluminescence Resonance Energy Transfer (BRET) for real-time monitoring of GPCR-beta-arrestin complexes in live cells.
  • Confocal microscopy, ELISAs for internalization/recycling kinetics, and MAPK pathway assays.

Main Results:

  • BRET technology provides novel insights into the temporal dynamics of GPCR-beta-arrestin interactions.
  • Integrated methodologies allow comprehensive analysis of beta-arrestin-mediated GPCR regulation.

Conclusions:

  • Modern experimental tools, particularly BRET, significantly enhance the ability to investigate the multifaceted roles of beta-arrestins in GPCR signaling.
  • Further research using these techniques will continue to expand our knowledge of beta-arrestin-dependent cellular processes.