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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.
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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 Receptors01:15

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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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GPCRs Regulate Adenylyl Cylase Activity01:09

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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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IP3/DAG Signaling Pathway01:11

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Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and...
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GPCR Desensitization01:12

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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...
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Updated: Jan 13, 2026

Construction of Model Lipid Membranes Incorporating G-protein Coupled Receptors GPCRs
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Human class B1 GPCR modulation by plasma membrane lipids.

Kin W Chao1,2,3, Linda Wong4, Affiong I Oqua4

  • 1Department of Life Sciences, Sir Ernst Chain Building, Imperial College London, London, UK.

Communications Biology
|January 8, 2026
PubMed
Summary
This summary is machine-generated.

Class B1 G protein-coupled receptors (GPCRs) interact with lipids like cholesterol and PIP2 in state-dependent ways. These lipid interactions are conserved across the subfamily and influence receptor dynamics, impacting drug discovery.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Pharmacology

Background:

  • Class B1 G protein-coupled receptors (GPCRs) are crucial for metabolism, neuronal activity, and drug development.
  • Lipids significantly modulate GPCR signaling, but detailed molecular interactions with Class B1 GPCRs are not well understood.

Purpose of the Study:

  • To investigate the molecular-level interactions between lipids and 15 human Class B1 GPCRs in active and inactive states.
  • To identify conserved patterns of lipid-receptor interactions across the Class B1 GPCR subfamily.

Main Methods:

  • Coarse-grained molecular dynamics (MD) simulations of 15 human Class B1 GPCRs.
  • Utilized aiida-gromacs for simulation setup provenance in complex plasma membranes.
  • Performed in vitro time-resolved Förster Resonance Energy Transfer (FRET) assays.

Main Results:

  • Class B1 GPCRs exhibit state-dependent interactions with cholesterol and phosphatidylinositol-4,5-bisphosphate (PIP2) at specific surface locations.
  • Conserved patterns of lipid interaction dynamics were identified across the GPCR subfamily.
  • The glycosphingolipid GM3 was found to modulate the dynamics of Class B1 extracellular domains.

Conclusions:

  • Lipid interactions are integral to the functional states of Class B1 GPCRs.
  • Understanding these conserved lipid-GPCR dynamics can inform the development of targeted therapeutics.
  • GM3 plays a significant role in regulating Class B1 GPCR extracellular domain dynamics.