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Related Concept Videos

Protein Diffusion in the Membrane01:24

Protein Diffusion in the Membrane

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...
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.Fatty acids tails of phospholipids can be either saturated or...
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 a relatively...
Mechanisms of Membrane-bending01:15

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The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
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 cytoskeletal...

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Realistic Membrane Modeling Using Complex Lipid Mixtures in Simulation Studies
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Microscopic simulation of membrane molecule diffusion on corralled membrane surfaces.

Anne Marie S Niehaus1, Dionisios G Vlachos, Jeremy S Edwards

  • 1Department of Chemical Engineering, University of Delaware, Newark, Delaware, USA.

Biophysical Journal
|November 13, 2007
PubMed
Summary

Corral structures in plasma membranes significantly impact receptor diffusion. Our model shows fence barriers recreate experimentally observed differences in molecule diffusivity, explaining membrane dynamics.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Computational Biology

Background:

  • Understanding receptor diffusion and clustering in plasma membranes is limited.
  • Existing data suggest membrane molecule diffusion is influenced by corral barriers.

Purpose of the Study:

  • To develop a stochastic spatial model simulating corral effects on plasma membrane molecule diffusion.
  • To analyze how corral parameters influence receptor diffusion rates.

Main Methods:

  • Developed a stochastic spatial model.
  • Simulated diffusion of molecules within corralled plasma membranes.
  • Derived an expression for macroscopic diffusivity.

Main Results:

  • Model confirms fence barriers (10^3-10^4) recreate experimental diffusivity differences.
  • Analyzed effects of corral parameters on diffusion rate.
  • Investigated lattice model appropriateness and boundary conditions for diffusion.

Conclusions:

  • Fence barriers are crucial for understanding plasma membrane diffusion dynamics.
  • High temporal resolution (microseconds) and long trajectories (milliseconds) are needed to observe anomalous diffusion.