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Related Concept Videos

Transducer Mechanism: G Protein–Coupled Receptors01:30

Transducer Mechanism: G Protein–Coupled Receptors

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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,...
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G Protein-coupled Receptors01:15

G Protein-coupled Receptors

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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...
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GPCRs Regulate Adenylyl Cylase Activity01:09

GPCRs Regulate Adenylyl Cylase Activity

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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...
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GPCR Desensitization01:12

GPCR Desensitization

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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...
5.9K
Activation and Inactivation of G Proteins01:22

Activation and Inactivation of G Proteins

6.9K
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...
6.9K
G-Protein Gated Ion Channels01:21

G-Protein Gated Ion Channels

4.6K
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...
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Related Experiment Video

Updated: Jun 17, 2025

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

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G protein-coupled receptor (GPCR) pharmacogenomics.

Miles D Thompson1, David Reiner-Link2, Alessandro Berghella2

  • 1Krembil Brain Institute, Toronto Western Hospital, Toronto, Ontario, Canada.

Critical Reviews in Clinical Laboratory Sciences
|August 9, 2024
PubMed
Summary

Pharmacogenomics, using next-generation sequencing, now encompasses pharmacogenetics by identifying genetic variants affecting drug responses. G protein-coupled receptor (GPCR) variants significantly impact drug efficacy and safety, guiding personalized medicine.

Keywords:
AgonistG protein-coupled receptorantagonistdrug labelpharmacogenomics

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Area of Science:

  • Genomics and Bioinformatics
  • Pharmacology and Therapeutics

Background:

  • Pharmacogenetics investigates genetic variations influencing drug responses.
  • Pharmacogenomics employs a genome-wide approach, enhanced by next-generation sequencing (NGS).
  • G protein-coupled receptors (GPCRs) are crucial drug targets, making their genetic variants highly relevant.

Purpose of the Study:

  • To explore the impact of G protein-coupled receptor (GPCR) genetic variants on drug response.
  • To highlight the integration of pharmacogenetics into pharmacogenomics through advanced sequencing technologies.
  • To discuss the clinical implications of GPCR pharmacogenomic data for personalized medicine.

Main Methods:

  • Utilizing next-generation sequencing (NGS) for genome-wide variant identification.
  • Analyzing functional studies of G protein-coupled receptor (GPCR) variants.
  • Integrating computational tools and publicly available genomic data.

Main Results:

  • GPCR variants (coding, non-coding, indels) affect receptor function, cell surface expression, and ligand binding.
  • Pharmacogenomic data reveals associations between GPCR variants and drug response phenotypes.
  • Examples include roles in COVID-19, cytokine storms, and protease-activated receptor interventions.

Conclusions:

  • GPCR pharmacogenomics is essential for understanding drug response and adverse reactions.
  • Increased data on GPCR variants will lead to improved drug labeling and clinical guidance.
  • Personalized drug selection based on GPCR pharmacogenomic profiles offers significant patient benefits.