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Related Concept Videos

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Biological membranes show uneven distribution of different types of lipids in the inner and outer layers, resulting in transverse asymmetric membranes. The treatment of the erythrocyte membrane with the enzyme phospholipase confirmed the asymmetric nature of the lipid bilayer. The enzyme hydrolyzes lipids into fatty acids and hydrophilic groups. The phospholipase acts only on the outer layer of the membrane, while the inner layer remains intact. The phospholipase treatment resulted in 80%...
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Scientists identified the plasma membrane in the 1890s and its principal chemical components (lipids and proteins) by 1915. The model for plasma membrane structure, proposed in 1935 by Hugh Davson and James Danielli, was the first model to be widely accepted in the scientific community. The model was based on the plasma membrane's "railroad track" appearance in early electron micrographs. Davson and Danielli theorized that the plasma membrane's structure resembled a sandwich...
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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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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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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
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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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Updated: May 12, 2025

Construction of Model Lipid Membranes Incorporating G-protein Coupled Receptors GPCRs
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Lipid-GPCR interactions in an asymmetric plasma membrane model.

Jingjing Ji1, Edward Lyman1,2

  • 1Department of Physics and Astronomy, University of Delaware, Newark, DE, USA. elyman@udel.edu.

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|May 8, 2025
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Summary

Simulations reveal how the adenosine A2A receptor interacts with lipids and cholesterol in asymmetric and symmetric cell membranes. Phosphatidylserine interactions remain stable, while cholesterol binding is sensitive to membrane asymmetry.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Computational Biophysics

Background:

  • The adenosine A2A receptor (A2AR) is a G protein-coupled receptor involved in various physiological processes.
  • Understanding A2AR's interaction with the cell membrane is crucial for drug development.
  • Membrane lipid asymmetry plays a significant role in receptor function.

Purpose of the Study:

  • To investigate the impact of lipid asymmetry on A2AR interactions in its active state.
  • To compare A2AR's lipid and cholesterol binding in asymmetric versus symmetric membrane models.

Main Methods:

  • Molecular dynamics simulations of A2AR in two distinct membrane environments: asymmetric and symmetric.
  • Analysis of lipid-protein and cholesterol-protein interactions.

Main Results:

  • Phosphatidylserine (PS) solvation around A2AR is insensitive to the loss of membrane asymmetry due to charged residues.
  • Cholesterol interactions are sensitive to lipid asymmetry, with higher abundance in the exoplasmic leaflet.
  • A specific cholesterol binding site on helix 6 is conserved across different membrane models.

Conclusions:

  • Lipid asymmetry influences cholesterol binding to A2AR but not PS solvation.
  • The identified cholesterol binding site on helix 6 is a stable interaction point.
  • These findings provide insights into A2AR's membrane environment and potential drug targeting.