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Protein Dynamics in Living Cells01:19

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Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
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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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Related Experiment Video

Updated: Oct 25, 2025

Single-Molecule Tracking Microscopy - A Tool for Determining the Diffusive States of Cytosolic Molecules
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Single-Particle Tracking Reveals Anti-Persistent Subdiffusion in Cell Extracts.

Konstantin Speckner1, Matthias Weiss1

  • 1Experimental Physics I, University of Bayreuth, Universitätsstr. 30, D-95447 Bayreuth, Germany.

Entropy (Basel, Switzerland)
|August 6, 2021
PubMed
Summary
This summary is machine-generated.

Single-particle tracking reveals anti-persistent subdiffusion of nanoparticles in Xenopus laevis egg extracts. Macromolecular crowding in these extracts creates a viscoelastic environment, influencing particle movement.

Keywords:
anomalous diffusionrandom walksingle-particle tracking

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Last Updated: Oct 25, 2025

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Area of Science:

  • Biophysics
  • Cell Biology
  • Soft Matter Physics

Background:

  • Single-particle tracking (SPT) quantifies transport in complex media.
  • Transport phenomena in cell extracts are understudied.
  • Xenopus laevis extracts mimic cellular processes.

Purpose of the Study:

  • Investigate nanoparticle transport in Xenopus laevis extracts.
  • Characterize subdiffusion dynamics in these complex biological fluids.
  • Explore the impact of chemical treatments on transport.

Main Methods:

  • Extensive single-particle tracking (SPT) experiments.
  • Utilized 20 nm radius beads as tracers.
  • Analyzed native and chemically treated Xenopus laevis egg extracts.

Main Results:

  • Observed anti-persistent subdiffusion consistent with fractional Brownian motion.
  • Chemical treatments minimally altered the observed transport behavior.
  • Evidence suggests macromolecular crowding induces viscoelasticity.

Conclusions:

  • Xenopus laevis extracts exhibit viscoelastic properties affecting particle transport.
  • Macromolecular crowding is a key factor in the anti-persistent subdiffusion.
  • SPT provides detailed insights into nanoscale transport in biological extracts.