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Transducer Mechanism: G Protein–Coupled Receptors01:30

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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.
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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.
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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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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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Tension Response at Adherens Junctions01:26

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The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
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Mechanically-gated ion channels are proteins found in eukaryotic and prokaryotic cell membranes that open in response to mechanical stress. Tension, compression, swelling, and shear stress can alter the conformation of the protein, opening a transmembrane channel that allows the passage of ions for signal transmission. In eukaryotes, mechanically-gated channels are distributed in several regions like the neurons, lungs, skin, bladder, and heart, where they play critical roles in numerous...
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Updated: Oct 2, 2025

A Kinetic Fluorescence-based Ca2+ Mobilization Assay to Identify G Protein-coupled Receptor Agonists, Antagonists, and Allosteric Modulators
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Ligands and Beyond: Mechanosensitive Adhesion GPCRs.

Hsi-Hsien Lin1,2,3, Kwai-Fong Ng2, Tse-Ching Chen2

  • 1Department of Microbiology and Immunology, College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan.

Pharmaceuticals (Basel, Switzerland)
|February 26, 2022
PubMed
Summary

Cells use plasma membrane receptors to sense mechanical forces. This review focuses on adhesion G protein-coupled receptors (aGPCRs), highlighting their role in converting mechanical stimuli into cellular signals.

Keywords:
GPCR activationGPS autoproteolysisadhesion GPCRmechanotransductionsignalingtethered ligand

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Biophysics

Background:

  • Cells detect mechanical stimuli via plasma membrane receptors.
  • G protein-coupled receptors (GPCRs) are a large protein superfamily sensing various signals.
  • GPCRs are increasingly recognized for their mechanotransduction capabilities.

Purpose of the Study:

  • To review current evidence on mechanosensitive adhesion GPCRs (aGPCRs).
  • To highlight the role of aGPCRs in converting mechanical cues into cellular responses.

Main Methods:

  • Literature review of existing research on GPCRs and mechanosensation.
  • Analysis of the structural and functional properties of adhesion GPCRs relevant to mechanosensing.

Main Results:

  • Adhesion GPCRs (aGPCRs) are well-suited for mechanosensory functions due to their unique architecture.
  • Evidence suggests aGPCRs play a significant role in cellular mechanotransduction.
  • aGPCRs represent the second largest GPCR subfamily, emphasizing their importance.

Conclusions:

  • Adhesion GPCRs are key players in cellular mechanotransduction.
  • Further research into mechanosensitive aGPCRs is warranted to understand their full scope of function.