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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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Asymmetric Lipid Bilayer01:35

Asymmetric Lipid Bilayer

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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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Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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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.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Fluid Mosaic Model01:19

Fluid Mosaic Model

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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 Fluidity01:26

Membrane Fluidity

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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.
Mosaic nature of the membrane
The mosaic characteristic of the membrane helps the plasma membrane remain fluid. The integral proteins and lipids exist as separate but loosely-attached molecules in the membrane. The membrane is...
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The Fluid Mosaic Model01:34

The Fluid Mosaic Model

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The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
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Related Experiment Video

Updated: May 21, 2025

Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions
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Assembly of Cell Mimicking Supported and Suspended Lipid Bilayer Models for the Study of Molecular Interactions

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A supported lipid bilayer to model solid-ordered membrane domains.

Sally Helmy1, Paola Brocca2, Alexandros Koutsioubas3

  • 1Department of Medical Biotechnology and Translational Medicine, Università Degli Studi di Milano, Milano, Italy; Biophysics Group, Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt.

Journal of Colloid and Interface Science
|March 19, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a new three-component membrane model using DMPC, sphingomyelin, and cholesterol to mimic lipid rafts. This model allows for studying membrane organization and physical properties relevant to cellular functions.

Keywords:
Atomic force microscopyCholesterolDMPCDifferential scanning calorimetryLipid membraneNeutron reflectometrySphingomyelin

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

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Plasma membrane models are crucial for understanding cellular interactions.
  • Lipid rafts, specialized membrane domains, are formed by lipid and cholesterol mixtures.
  • Membrane fluidity, influenced by lipid composition, affects biological activity.

Purpose of the Study:

  • To introduce a novel three-component membrane model mimicking solid ordered lipid rafts.
  • To investigate the behavior and physical characteristics of this model membrane.
  • To provide a system for studying molecular mechanisms of membrane functions.

Main Methods:

  • Differential scanning calorimetry for thermotropic behavior.
  • Neutron reflectometry for transverse organization.
  • Atomic force microscopy for lateral organization.

Main Results:

  • The study successfully created a three-component membrane model with DMPC, sphingomyelin, and cholesterol.
  • Characterization revealed insights into the membrane's transverse and lateral organization.
  • The model exhibits tunable physical characteristics relevant to lipid rafts.

Conclusions:

  • The novel membrane model serves as an excellent system for studying lipid raft behavior.
  • The combination of DMPC, sphingomyelin, and cholesterol offers a tunable platform.
  • This research advances the understanding of membrane functions like signaling and trafficking.