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Related Concept Videos

Mechanisms of Membrane Domain Formation00:59

Mechanisms of Membrane Domain Formation

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 cytoskeletal...
Intermolecular Forces03:13

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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 bonds, and dispersion...
Fluid Mosaic Model01:19

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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 with the analogy of...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Protein Diffusion in the Membrane01:24

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Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
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Updated: Jun 3, 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

Long-range interaction between heterogeneously charged membranes.

Y S Jho1, R Brewster, S A Safran

  • 1Materials Research Laboratory, University of California at Santa Barbara, Santa Barbara, California, USA. yongseokjho@gmail.com

Langmuir : the ACS Journal of Surfaces and Colloids
|March 18, 2011
PubMed
Summary
This summary is machine-generated.

Heterogeneous surface charges on neutral membranes can create long-range attractions. Numerical simulations show these electrostatic interactions are significant at nanometer separations, influenced by domain size and salt concentration.

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Area of Science:

  • Biophysics
  • Surface Science
  • Computational Modeling

Background:

  • Neutral surfaces with heterogeneous charge distributions can exhibit electrostatic interactions.
  • Lipid membranes form stable domains due to competing hydrophobic and electrostatic forces.

Purpose of the Study:

  • To investigate long-range electrostatic attractions between neutral surfaces with heterogeneous charge distributions.
  • To explore the influence of domain size, line tension, and salt concentration on intermembrane interactions.

Main Methods:

  • Numerical simulations were employed to model electrostatic interactions.
  • Analysis focused on domain formation, charge correlations, and intermembrane forces.

Main Results:

  • Strong attractions were observed between opposing surfaces at nanometer separations.
  • Increased line tension led to larger domains and enhanced attraction.
  • Higher salt concentrations increased domain size but reduced net attraction due to screening.

Conclusions:

  • Heterogeneous charge domains on neutral membranes can mediate significant long-range attractions.
  • Domain characteristics and ionic environment critically control the strength and range of these interactions.
  • Findings have implications for understanding membrane adhesion and self-assembly.