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GPCR Desensitization

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...

Cell-surface Signaling

Cell-surface Signaling

Hormones—or any molecule that binds to a receptor, known as a ligand—that are lipid-insoluble (water-soluble) are not able to diffuse across the cell membrane. In order to be able to affect a cell without entering it, these hormones bind to receptors on the cell membrane. When a first messenger, a hormone, binds to a receptor, a signal cascade is set off, causing second messengers, proteins inside the cell, to become activated, resulting in downstream effects.

G-protein Coupled Receptors

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.

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Related Experiment Video

Updated: Feb 2, 2026

Calibration-free In Vitro Quantification of Protein Homo-oligomerization Using Commercial Instrumentation and Free, Open Source Brightness Analysis Software

Calibration-free In Vitro Quantification of Protein Homo-oligomerization Using Commercial Instrumentation and Free, Open Source Brightness Analysis Software

Published on: July 17, 2018

GPCR homo-oligomerization.

Graeme Milligan¹, Richard J Ward¹, Sara Marsango¹

¹Centre for Translational Pharmacology, Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, Scotland, United Kingdom.

Current Opinion in Cell Biology

|November 20, 2018

Summary

This summary is machine-generated.

G protein-coupled receptors (GPCRs) may form dimers and oligomers, influencing their function. Recent studies explore GPCR organization, stability, and functional significance using advanced methods.

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Calibration-free In Vitro Quantification of Protein Homo-oligomerization Using Commercial Instrumentation and Free, Open Source Brightness Analysis Software

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Genetic and Biochemical Approaches for In Vivo and In Vitro Assessment of Protein Oligomerization: The Ryanodine Receptor Case Study

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Published on: July 9, 2015

Area of Science:

Biochemistry
Molecular Biology
Cell Biology

Background:

G protein-coupled receptors (GPCRs) are crucial transmembrane proteins regulating diverse physiological processes.
While often perceived as monomers, GPCRs are increasingly studied for their potential to form dimers and higher-order oligomers.

Purpose of the Study:

To investigate the organization, stability, and functional implications of GPCR dimers and oligomers.
To review recent studies employing advanced techniques to assess GPCR oligomerization.

Main Methods:

Computational modeling approaches.
Single-molecule tracking techniques.
Quantal brightness and fluorescence fluctuation measurements.

Main Results:

Recent studies provide evidence for the existence and functional relevance of GPCR dimers and oligomers.
Advanced biophysical and computational methods are key to understanding GPCR organization.

Conclusions:

GPCR oligomerization is a significant factor influencing receptor function, including trafficking, ligand binding, and signaling.
Further research into GPCR organization is essential for a comprehensive understanding of their roles in physiology and disease.