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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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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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Intermolecular Forces03:13

Intermolecular Forces

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Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
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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.
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Van der Waals Interactions01:24

Van der Waals Interactions

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Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Inter-domain interactions in charged lipid monolayers.

Benjamín Caruso1, Marcos Villarreal, Luis Reinaudi

  • 1Centro de Investigaciones en Química Biológica de Córdoba (CIQUIBIC), Dpto. de Química Biológica, and ‡Instituto de Investigaciones en Físico-Química de Córdoba (INFIQC), Dpto. de Matemática y Física, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba , Pabellón Argentina, Ciudad Universitaria, X5000HUA Córdoba, Argentina.

The Journal of Physical Chemistry. B
|December 19, 2013
PubMed
Summary
This summary is machine-generated.

Charged surfactant domains in model biomembranes exhibit complex interactions. Lower ionic strength leads to increased repulsion and viscosity, impacting lipid domain dynamics and membrane properties.

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Area of Science:

  • Biophysics
  • Surface Chemistry
  • Membrane Science

Background:

  • Model biomembranes exhibit phase coexistence with lipid domains influencing molecular diffusion.
  • Interactions between these domains are crucial for understanding membrane behavior.

Purpose of the Study:

  • To analyze interdomain interactions in charged surfactant monolayers.
  • To compare charged systems with neutral counterparts under varying ionic strengths.
  • To investigate the impact of interdomain distance on interaction dynamics.

Main Methods:

  • Simulations and experimental comparisons were used to model domain interactions.
  • Domain interactions were analyzed at different interdomain distances and ionic strengths.
  • A harmonic potential model was employed to determine the spring constant for domains in a lattice.

Main Results:

  • At low ionic strength, charged domains showed higher repulsion and reduced motion, increasing apparent viscosity.
  • At high ionic strength, charged domains behaved similarly to neutral domains, with motion precluded at high condensed area.
  • Observed effects persisted even when Debye-Hückel length was significantly smaller than interdomain distances.

Conclusions:

  • Ionic strength critically influences interdomain interactions and dynamics in charged surfactant monolayers.
  • Electrostatic interactions play a significant role in modulating membrane viscosity and domain behavior.
  • Understanding these interactions is key to comprehending biomembrane organization and function.