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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

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...

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, 7TM, or...

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

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 Gated Ion Channels

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

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

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

Published on: June 9, 2017

Focus issue: Cracking the G protein-coupled receptor code.

Nancy R Gough¹

¹Editor, Science Signaling, AAAS, 1200 New York Avenue, NW, Washington, DC 20005, USA. ngough@aaas.org

Science Signaling

|August 27, 2011

Summary

This summary is machine-generated.

G protein-coupled receptors regulate physiology and are targeted by drugs. New research shows how receptor phosphorylation and disease mutations influence cellular responses to ligands, revealing signaling mechanisms.

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Area of Science:

Biochemistry
Cellular Biology
Pharmacology

Background:

G protein-coupled receptors (GPCRs), or seven-transmembrane receptors, are a major class of drug targets crucial for physiological regulation.
Understanding GPCR signaling is vital for developing effective therapeutics.

Purpose of the Study:

To elucidate how GPCR phosphorylation by agonists dictates distinct cellular responses.
To investigate the impact of disease-associated mutations on GPCR ligand responsiveness.
To reveal the mechanisms underlying ligand-specific, cell-specific, and genome-specific GPCR signaling.

Main Methods:

The study analyzes GPCR phosphorylation events.
It examines the effects of specific mutations on receptor function.
It decodes the complex signaling pathways initiated by GPCRs.

Main Results:

Receptor phosphorylation is shown to mediate distinct cellular outcomes upon agonist binding.
Disease-associated mutations alter GPCR sensitivity to ligands, impacting signaling.
The research clarifies how GPCR signaling is encoded and decoded for specific responses.

Conclusions:

GPCR phosphorylation is a key determinant of signaling specificity.
Understanding GPCR mutations is essential for predicting and treating related diseases.
This work provides fundamental insights into the complex regulation of GPCR-mediated physiological processes.