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Related Concept Videos

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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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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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

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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 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
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Membrane Lipids01:32

Membrane Lipids

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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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Atomic Force Microscopy Imaging and Force Spectroscopy of Supported Lipid Bilayers
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Interaction forces between ternary lipid bilayers containing cholesterol.

James Kurniawan1, Nai-Ning Yin, Gang-yu Liu

  • 1Department of Chemical Engineering and Materials Science and ‡Department of Chemistry, University of California-Davis , Davis, California 95616, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|April 11, 2014
PubMed
Summary
This summary is machine-generated.

Membrane adhesion is enhanced by hydrophobic attraction from defects, not just lipids. These defects also allow for membrane restructuring upon contact, influencing interactions.

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Area of Science:

  • Biophysics
  • Materials Science
  • Surface Science

Background:

  • Lipid membranes are crucial in biological systems.
  • Cholesterol modulates membrane properties.
  • Understanding membrane interactions is key to cell function.

Purpose of the Study:

  • To investigate interaction forces between lipid membranes with varying compositions.
  • To elucidate the role of cholesterol and defects in membrane adhesion.
  • To characterize electrostatic and adhesive forces at the membrane interface.

Main Methods:

  • Surface Force Apparatus (SFA) for force-distance profiling.
  • Atomic Force Microscopy (AFM) for defect visualization.
  • Zeta potential and fluorescence microscopy for surface charge analysis.

Main Results:

  • Weak electrostatic repulsion due to trace charged lipid impurities was observed.
  • Enhanced adhesion at contact, exceeding van der Waals forces.
  • Hydrophobic attraction from exposed membrane leaflets at nanoscopic defects.
  • Membrane restructuring facilitated by defects at the contact interface.

Conclusions:

  • Trace impurities significantly influence long-range electrostatic interactions.
  • Nanoscopic defects and exposed hydrophobic regions drive enhanced membrane adhesion.
  • Membrane defects play a critical role in contact-induced restructuring and adhesion.