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Related Concept Videos

Structure of Lipids03:38

Structure of Lipids

Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
Structure of Lipids03:38

Structure of Lipids

Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
Structure of Lipids03:38

Structure of Lipids

Lipids include a diverse group of compounds that are largely nonpolar in nature. This is because they are hydrocarbons that include mostly nonpolar carbon-carbon or carbon-hydrogen bonds. Non-polar molecules are hydrophobic (“water fearing”), or insoluble in water. Lipids perform many different functions in a cell. Cells store energy for long-term use in the form of fats. Lipids also provide insulation from the environment for plants and animals. For example, they help keep aquatic birds and...
Membrane Domains01:18

Membrane Domains

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 anterior...
Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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%...
Membrane Lipids01:32

Membrane Lipids

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.
Phosphatidylcholine, phosphatidylethanolamine, phosphatidylserine, and sphingomyelin are the most common phospholipids present in mammalian membranes. At physiological pH, phosphatidylserine is negatively charged, while the other three...

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Related Experiment Video

Updated: May 8, 2026

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
07:31

Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies

Published on: September 1, 2023

Composite contact of binary lipid membranes.

U Jelerčič1, P Ziherl

  • 1Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia. urska.jelercic@ijs.si

The European Physical Journal. E, Soft Matter
|August 13, 2013
PubMed
Summary

Binary lipid membranes can partially fuse, forming a rigid structure with inverted micelles. This composite zone exhibits significantly enhanced bending rigidity compared to non-separated bilayers due to increased monolayer separation.

Area of Science:

  • Biophysics
  • Materials Science

Background:

  • Binary lipid membranes can undergo partial fusion upon adhesion.
  • This fusion is driven by microscopic phase separation of lipid components.
  • In specific lipid compositions, a fused zone can form inverted micelles between monolayers.

Purpose of the Study:

  • To theoretically analyze the elastic properties of partially fused binary lipid membranes.
  • To calculate the bending moduli of composite contact zones formed by inverted micelles.
  • To understand the mechanism behind the enhanced rigidity in these structures.

Main Methods:

  • Theoretical analysis of elastic properties.
  • Calculation of bending moduli for composite contact zones.
  • Modeling of membrane structures with inverted micelles.

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Main Results:

  • The composite contact zone, featuring inverted micelles, shows considerably larger bending moduli than a phase-nonseparated double bilayer.
  • The presence of water within the inverted micelles increases the separation between the two monolayers.
  • This increased separation is the primary factor contributing to the enhanced rigidity of the composite structure.

Conclusions:

  • Partially fused binary lipid membranes with inverted micelles exhibit significantly enhanced elastic rigidity.
  • The structural arrangement, particularly the water-filled inverted micelles, dictates the mechanical properties.
  • This finding has implications for understanding membrane fusion and the mechanical behavior of lipid bilayers.