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Cholesterol: Significance and Regulation01:29

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Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
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The membrane domains concentrate specific lipids and proteins at one place within the membrane, which helps in cell signaling, adhesion, and other critical cellular processes. These domains can differ in size, composition, function, and lifespan.
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Lipids are an essential component of all biological membranes. The average lipid content in mammalian membranes is 50%, though it can be as low as 20% in the inner mitochondrial membrane or as high as 80% in the myelin sheath present around the nerve cells.
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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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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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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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Aggregation of 25-hydroxycholesterol in a complex biomembrane. Differences with cholesterol.

Vicente Galiano1, José Villalaín2

  • 1Computers Engineering Department, Development, and Innovation in Healthcare Biotechnology (IDiBE), Universidad "Miguel Hernández", E-03202 Elche-Alicante, Spain.

Biochimica Et Biophysica Acta. Biomembranes
|July 30, 2020
PubMed
Summary

25-Hydroxycholesterol (25HC) aggregates in cell membranes, unlike cholesterol. This unique behavior may explain its role in fighting viral infections by altering protein-membrane interactions.

Keywords:
25-HydroxycholesterolBis(monoacylglycero)phosphateCholesterolLate endosome membranePlasma membrane

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Membrane Biophysics

Background:

  • 25-Hydroxycholesterol (25HC) is a key oxysterol involved in cellular defense against pathogens.
  • The precise molecular mechanisms underlying 25HC's biological functions remain largely unknown.
  • Understanding 25HC's membrane interactions is crucial for elucidating its role in innate immunity.

Purpose of the Study:

  • To investigate the orientation, location, and lipid interactions of 25HC within model cell membranes.
  • To compare the membrane behavior of 25HC with that of cholesterol.
  • To explore the self-aggregation properties of 25HC.

Main Methods:

  • Molecular dynamics simulations were employed to study 25HC in two distinct model membrane systems (late endosome and plasma membrane mimics).
  • Analysis focused on 25HC's positional stability, conformational fluctuations, and impact on phospholipid order parameters.
  • Investigated the formation of 25HC aggregates and their interactions with cholesterol and lipids.

Main Results:

  • 25HC inserts into membranes at a stable, albeit distinct, position compared to cholesterol.
  • 25HC exhibits significantly greater membrane fluctuations than cholesterol.
  • 25HC spontaneously forms aggregates via hydrogen bonds, independent of the membrane system, while no 25HC-cholesterol interactions were observed.

Conclusions:

  • 25HC's tendency to aggregate without altering bulk membrane properties suggests a novel mechanism for modulating protein-membrane interactions.
  • These self-aggregating properties may underpin 25HC's potent antiviral and antibacterial activities.
  • Further research into 25HC aggregation could reveal new therapeutic strategies for infectious diseases.