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Related Concept Videos

Membrane Domains01:18

Membrane Domains

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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.
Protein Domains
The membrane comprises a group of distinct proteins responsible for carrying out a cell's specific function. For example, the plasma membrane of the human sperm, or a single germ cell, contains a unique set of proteins in the...
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Mechanisms of Membrane Domain Formation00:59

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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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Membrane Lipids01:32

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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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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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Biosynthesis of Lipids01:29

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Microbial membranes exhibit remarkable diversity in lipid composition, reflecting evolutionary adaptations to various environmental conditions. The three domains of life—Bacteria, Archaea, and Eukarya—synthesize membrane lipids through distinct biosynthetic pathways, leading to fundamental structural differences that impact membrane stability, function, and adaptability.Fatty Acid-Based Lipids in Bacteria and EukaryaBacteria and eukaryotes share a common fatty acid biosynthesis...
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Related Experiment Video

Updated: Apr 11, 2026

Fluorescence-Based Measurements of Phosphatidylserine/Phosphatidylinositol 4-Phosphate Exchange Between Membranes
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Coupling between sterol and sphingolipid structure in ordered membrane domains.

Israel Juarez-Contreras1, Hyesoo Kim1, Itay Budin1

  • 1Department of Biochemistry & Molecular Biophysics, University of California San Diego, La Jolla, CA 92093, USA.

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Yeast and mammalian cells use different lipids for membrane structure. This study shows sphingolipid chain length and sterol type (cholesterol vs. ergosterol) control membrane order and domain formation, revealing co-evolutionary roles.

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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Area of Science:

  • Cell Biology
  • Biochemistry
  • Membrane Biophysics

Background:

  • Eukaryotic membranes feature lineage-specific sterols and sphingolipids, crucial for structure.
  • Mammals use cholesterol and long-chain sphingolipids; fungi use ergosterol and very long-chain sphingolipids.
  • These lipid classes are proposed to co-evolve for membrane organization.

Purpose of the Study:

  • Investigate how sterol structure and sphingolipid chain length influence membrane order and phase behavior.
  • Determine the physical basis for lipid interactions in membrane organization.
  • Compare ergosterol and cholesterol in synthetic membranes with varying sphingolipid chain lengths.

Main Methods:

  • Studied membrane order and phase behavior in yeast (Saccharomyces cerevisiae) vacuole membranes.
  • Utilized synthetic lipid membranes with defined compositions of ergosterol or cholesterol and sphingomyelin (C16 and C26 chains).
  • Measured membrane order and analyzed lipid domain formation using biophysical techniques.

Main Results:

  • Loss of very long-chain sphingolipids or substitution of ergosterol disrupted yeast vacuole membrane liquid-ordered (Lo) domains.
  • Ergosterol sparsely supported Lo domains with C16 sphingomyelin, unlike cholesterol.
  • C26 sphingomyelin enabled distinct phase separation windows for ergosterol mixtures, mimicking yeast vacuole behavior under nutrient limitation.
  • Cholesterol increased membrane packing more than ergosterol with C16 sphingomyelin, but this difference vanished with C26 sphingomyelin.

Conclusions:

  • Sphingolipid chain length significantly tunes sterol interactions, impacting membrane organization.
  • Ergosterol and very long-chain sphingolipids in yeast facilitate specific membrane phase behaviors relevant to physiological conditions.
  • Findings support the co-evolution model of sterols and sphingolipids for membrane structure and function.