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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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Lipids as Anchors01:32

Lipids as Anchors

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In the plasma membrane, the lipids forming the bilayer can also act as an anchor to tether proteins to the membrane. The three main types of lipid anchors found in eukaryotes are – prenyl groups, fatty acyl groups, and glycosylphosphatidylinositol or GPI groups. Prenyl and fatty acyl groups act as anchors on the cytosolic surface of the membrane, whereas GPI anchors proteins on the extracellular side.
The carboxy-terminal of most of the prenylated proteins, such as Ras proteins, contains...
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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 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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Reconstitution of Membrane-Tethered Minimal Actin Cortices on Supported Lipid Bilayers
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Supported lipid bilayers as dynamic platforms for tethered particles.

Kevin L Hartman1, Sungi Kim, Keunsuk Kim

  • 1Department of Chemistry, Seoul National University, Gwanak-gu, Seoul, 151-747, South Korea. jmnam@snu.ac.kr.

Nanoscale
|November 20, 2014
PubMed
Summary
This summary is machine-generated.

Nanoparticle tethering to lipid bilayers allows researchers to observe many diffusing particles in one view. This technique enables studies on lipid mobility, biomolecule sensing, and nanoparticle manipulation using electric fields.

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Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Lipid bilayers are fundamental to cell membranes.
  • Observing nanoparticle behavior on bilayers is crucial for understanding molecular interactions.
  • Current methods face limitations in tracking multiple particles simultaneously.

Purpose of the Study:

  • To review studies utilizing nanoparticle tethering to lipid bilayers.
  • To highlight the application of this technique in investigating physical properties.
  • To discuss the manipulation of tethered nanoparticles.

Main Methods:

  • Tethering diverse nanoparticles (plasmonic metals, soft matter) to fluid lipid bilayers.
  • Employing covalent and non-covalent attachment strategies.
  • Utilizing controlled experimental platforms for precise tracking and composition control.

Main Results:

  • Observation of hundreds of diffusing nanoparticles within a single field of view.
  • Stable tethering of various materials to lipid bilayers.
  • Accurate tracking of nanoparticle interactions and surface dynamics.

Conclusions:

  • Nanoparticle tethering to lipid bilayers is a powerful platform for biophysical studies.
  • This method facilitates investigations into lipid mobility, biomolecule sensing, and surface interactions.
  • Reversible manipulation of tethered nanoparticles via electric fields is demonstrated.