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Related Concept Videos

Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

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Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...
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Asymmetric Lipid Bilayer01:35

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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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Membrane fluidity is explained by the fluid mosaic model of the cell membrane, which describes the plasma membrane structure as a mosaic of components—including phospholipids, cholesterol, proteins, and carbohydrates—that gives the membrane a fluid character.
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Cell membranes are composed of phospholipids, proteins, and carbohydrates loosely attached to one another through chemical interactions. Molecules are generally able to move about in the plane of the membrane, giving the membrane its flexible nature called fluidity. Two other features of the membrane contribute to membrane fluidity: the chemical structure of the phospholipids and the presence of cholesterol in the membrane.
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Biomembrane Fabrication by the Solvent-assisted Lipid Bilayer SALB Method
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Cholesterol Partition and Condensing Effect in Phase-Separated Ternary Mixture Lipid Multilayers.

Yicong Ma1, Sajal K Ghosh1, David A DiLena1

  • 1Department of Physics, University of California-San Diego, La Jolla, California.

Biophysical Journal
|March 31, 2016
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Summary

Cholesterol partitions linearly between liquid-ordered and liquid-disordered phases in lipid mixtures. Its presence influences lipid packing and molecular area, with increased disorder observed at higher concentrations.

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Area of Science:

  • Biophysics
  • Materials Science
  • Physical Chemistry

Background:

  • Lipid membranes exhibit distinct liquid-ordered (Lo) and liquid-disordered (Ld) phases.
  • Cholesterol is a key component influencing membrane properties.
  • Understanding cholesterol's behavior in mixed lipid systems is crucial for membrane biophysics.

Purpose of the Study:

  • To investigate cholesterol partitioning and its condensing effect in ternary lipid mixtures.
  • To quantify cholesterol concentration within Lo and Ld phases.
  • To determine the impact of cholesterol on lipid packing and molecular area.

Main Methods:

  • X-ray lamellar diffraction was employed to analyze lipid multilayers.
  • Electron density profiles were deduced from diffraction data.
  • A novel lipid profile scaling method was developed for precise cholesterol quantification.

Main Results:

  • Cholesterol concentration increased linearly in both Lo and Ld phases with total cholesterol concentration.
  • The condensing effect was evaluated via phosphate-to-phosphate distances, yielding average molecular area.
  • Cholesterol's position was determined with high precision (±0.7Å).
  • Increased lipid packing disorder in the Lo phase was observed at 20-30% cholesterol.

Conclusions:

  • Cholesterol exhibits predictable partitioning behavior in mixed lipid phases.
  • Cholesterol significantly impacts lipid packing density and molecular organization.
  • The study provides a quantitative understanding of cholesterol's role in membrane phase behavior.