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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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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
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Enzymes like flippase, floppase, and scramblase transfer phospholipids from one layer to another in the membrane, thereby affecting membrane asymmetry.
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Eukaryotic flippases are type-IV P-type ATPases or P4-ATPases belonging to P-type ATPase family proteins that are membrane-bound pumps involved in the ATP-mediated transport of ions and molecules across the membrane. Flippases flip specific phospholipids from the outer to the inner leaflet of a membrane. All P4-ATPases have one...
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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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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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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Induced asymmetries in membranes.

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Plasma membrane lipid asymmetry, including saturation, naturally arises from phospholipid composition and sphingomyelin content, not solely external forces. Cholesterol asymmetry is also mild.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Membrane Biophysics

Background:

  • Eukaryotic plasma membranes exhibit ubiquitous lipid asymmetry, with distinct phospholipid distributions between leaflets.
  • Recent lipidomics studies reveal saturation asymmetry, prompting investigation into its origins.
  • The localization of cholesterol within membrane leaflets remains largely undetermined.

Purpose of the Study:

  • To investigate the natural origins of lipid saturation asymmetry in plasma membranes.
  • To determine the factors contributing to phospholipid and cholesterol distribution.
  • To simulate the effects of flippase proteins on membrane asymmetry.

Main Methods:

  • Utilized chemical potentials in silico to mimic flippase activity.
  • Analyzed the interplay between phospholipid number asymmetry, sphingomyelin content, and saturation asymmetry.
  • Modeled cholesterol behavior influenced by various membrane asymmetries.

Main Results:

  • Saturation asymmetry naturally emerges as a byproduct of phospholipid number asymmetry and sphingomyelin content.
  • The inherent tendency of plasmalogen lipids to be highly unsaturated is confirmed as a natural phenomenon.
  • Cholesterol distribution is influenced by all membrane asymmetries, but the resulting asymmetry is generally mild.

Conclusions:

  • Some observed lipid asymmetries may be intrinsic consequences of others, rather than requiring external regulation.
  • Plasmalogen lipids possess a natural propensity for high unsaturation.
  • Cholesterol asymmetry in plasma membranes is typically modest, despite influences from other lipid asymmetries.