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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.
Another mechanism for membrane domain formation involves membrane proteins interacting with...
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Membrane Fluidity01:26

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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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Membrane Fluidity01:23

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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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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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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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Related Experiment Video

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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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Fluid domain patterns in free-standing membranes captured on a solid support.

Tripta Bhatia1, Peter Husen2, John H Ipsen1

  • 1MEMPHYS - Center for Biomembrane Physics, University of Southern Denmark (SDU), 5230 Odense M, Denmark; Department of Physics Chemistry and Pharmacy, SDU.

Biochimica Et Biophysica Acta
|May 29, 2014
PubMed
Summary
This summary is machine-generated.

This study presents a new method to image lipid membrane domains in giant unilamellar vesicles (GUVs) using atomic force microscopy (AFM). The technique reveals nanoscale domain structures, offering insights into membrane fluidity and phase behavior.

Keywords:
AFMDomainsGiant unilamellar vesiclesMembranesRafts

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Area of Science:

  • Membrane Biophysics
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Giant unilamellar vesicles (GUVs) are crucial models for studying cell membrane properties.
  • Understanding lipid domain organization is key to deciphering membrane function.
  • Existing imaging techniques often lack the resolution to capture dynamic nanoscale domain structures.

Purpose of the Study:

  • To develop a novel methodology for fixating and imaging dynamic fluid domain patterns in GUVs at sub-optical resolutions.
  • To investigate the coexistence of liquid-ordered (lo) and liquid-disordered (ld) phases in ternary lipid mixtures.
  • To characterize nanoscale domain fluctuations and their dependence on lipid composition.

Main Methods:

  • Rapid transfer of individual GUVs to a solid support to create planar bilayer patches.
  • Atomic force microscopy (AFM) for high-resolution imaging of domain patterns in the fixed patches.
  • Analysis of domain size and distribution in relation to lipid phase diagrams.

Main Results:

  • High-resolution AFM imaging revealed nanoscale domains of lo and ld phases within the patches.
  • Observed domain fluctuations increased in size near the critical point, detectable even deep in the coexistence region.
  • Agreement in domain area-fraction between GUVs and patches supports the stability of the membrane's thermodynamic state.

Conclusions:

  • The developed methodology successfully captures kinetically trapped, dynamic domain structures of lipid membranes.
  • The findings provide detailed insights into lipid phase separation and nanoscale domain organization.
  • This approach is versatile and applicable to various lipid compositions, including complex biological membranes.