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G Protein-coupled Receptors

G Protein-coupled Receptors

G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...

G Protein-coupled Receptors

G Protein-coupled Receptors

Transducer Mechanism: G Protein–Coupled Receptors

Transducer Mechanism: G Protein–Coupled Receptors

G Protein–Coupled Receptors (GPCRs) are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to various stimuli. GPCRs regulate critical physiological pathways and are excellent drug targets for treating diseases such as diabetes, cancer, obesity, depression, or Alzheimer's. Nearly 35% of approved drugs implement their therapeutic effects by selectively interacting with specific GPCRs.
GPCRs are also called heptahelical,...

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...

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.

G-protein Coupled Receptors

G-protein Coupled Receptors

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Related Experiment Video

Updated: May 6, 2026

Construction of Model Lipid Membranes Incorporating G-protein Coupled Receptors GPCRs

Construction of Model Lipid Membranes Incorporating G-protein Coupled Receptors GPCRs

Published on: February 5, 2022

Lipid-dependent GPCR dimerization.

Alan D Goddard¹, Patricia M Dijkman, Roslin J Adamson

¹School of Life Sciences, University of Lincoln, Lincoln, United Kingdom.

Methods in Cell Biology

|October 23, 2013

Summary

This summary is machine-generated.

G protein-coupled receptors (GPCRs) form dimers, but lipid requirements are unclear. This study reconstitutes GPCRs into model membranes to investigate lipid effects on dimerization using Förster resonance energy transfer (FRET).

Keywords:

Dimer FRET G protein-coupled receptor (GPCR)Lipid dependence Liposome NTS1

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Last Updated: May 6, 2026

Construction of Model Lipid Membranes Incorporating G-protein Coupled Receptors GPCRs

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Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET

Visualizing the Conformational Dynamics of Membrane Receptors Using Single-Molecule FRET

Published on: August 17, 2022

Area of Science:

Biochemistry
Molecular Biology
Membrane Biophysics

Background:

G protein-coupled receptors (GPCRs) form functional dimers in cell membranes.
The specific lipid requirements mediating GPCR dimerization remain largely unknown.
In vivo studies are limited by challenges in controlling membrane lipid composition.

Purpose of the Study:

To develop and present techniques for reconstituting GPCRs into defined model lipid bilayers.
To investigate the influence of specific lipids and sterols on GPCR dimerization.
To establish a system for studying lipid-dependent receptor-receptor interactions.

Main Methods:

Reconstitution of GPCRs into liposomes with precisely controlled lipid and sterol concentrations.
Utilizing fluorescently labeled GPCRs for dimerization studies.
Monitoring receptor dimerization via Förster resonance energy transfer (FRET) and calculating apparent FRET efficiency.

Main Results:

Established a method to create model lipid bilayers for GPCR reconstitution.
Demonstrated the ability to control lipid composition and lipid-protein ratios in liposomes.
Developed protocols for fluorescent labeling of GPCRs and FRET-based dimerization analysis.

Conclusions:

The developed reconstitution system allows for precise control over membrane composition.
This approach facilitates the study of lipid-GPCR interactions and their role in dimerization.
Understanding lipid dependence is crucial for elucidating GPCR regulation in cellular environments.