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Related Concept Videos

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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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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Fluorescence Recovery after Merging a Droplet to Measure the Two-dimensional Diffusion of a Phospholipid Monolayer
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Measuring lipid membrane viscosity using rotational and translational probe diffusion.

Tristan T Hormel1, Sarah Q Kurihara1, M Kathleen Brennan1

  • 1Department of Physics and Materials Science Institute, University of Oregon, Eugene, Oregon 97401, USA.

Physical Review Letters
|May 27, 2014
PubMed
Summary
This summary is machine-generated.

This study introduces a new microrheology technique to measure membrane viscosity and tracer size. It reveals that the protein Sar1p increases membrane viscosity, uncovering new links between protein activity and membrane mechanics.

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Area of Science:

  • Membrane biophysics
  • Cellular mechanics
  • Biophysical techniques

Background:

  • Lipid bilayer fluidity is essential for membrane-bound macromolecule motion and biological function.
  • Traditional microrheological methods for membranes face challenges in interpreting tracer particle diffusion due to environmental uncertainties.

Purpose of the Study:

  • To develop a novel microrheological technique for quantifying membrane viscosity and tracer properties.
  • To investigate the relationship between protein activity and membrane mechanics.

Main Methods:

  • Developed a new technique measuring both rotational and translational diffusion coefficients of membrane-linked particles.
  • Applied the method to assess membrane hydrodynamics and tracer effective radii.
  • Investigated the effect of the vesicle trafficking protein Sar1p on membrane viscosity.

Main Results:

  • Successfully quantified membrane viscosity and measured effective tracer radii.
  • Observed a wide distribution of effective tracer radii, suggesting variable lipid association.
  • Demonstrated that Sar1p significantly increases membrane viscosity.

Conclusions:

  • The new technique allows for simultaneous measurement of viscosity, tracer size, and hydrodynamic models.
  • Protein activity, exemplified by Sar1p, can profoundly influence membrane mechanics.
  • Revealed novel couplings between protein function and membrane physical properties.