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Related Concept Videos

Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

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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.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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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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Mapping Molecular Diffusion in the Plasma Membrane by Multiple-Target Tracing MTT
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Surface-Tethering Enhances Precision in Measuring Diffusion Within 3D Protein Condensates.

Emily R Sumrall1, Guoming Gao1, Shelby Stakenas2

  • 1Biophysics Graduate Program, University of Michigan, Ann Arbor, MI 48109, USA; Center for RNA Biomedicine, University of Michigan, Ann Arbor, MI 48109, USA.

Journal of Molecular Biology
|September 19, 2025
PubMed
Summary
This summary is machine-generated.

Tethering biomolecular condensates suppresses their motion, enabling accurate measurement of internal molecular dynamics. This method prevents overestimation of diffusion, crucial for understanding membraneless organelles.

Keywords:
biomolecular condensatesdiffusionmembraneless organellessingle molecule trackingsurface passivation

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Area of Science:

  • Cell Biology
  • Biophysics

Background:

  • Biomolecular condensates (membraneless organelles) organize cellular functions.
  • Global condensate motion complicates studies of internal molecular dynamics.

Purpose of the Study:

  • To assess and address interference from condensate Brownian motion in diffusion measurements.
  • To develop a robust method for accurate quantification of intra-condensate molecular dynamics.

Main Methods:

  • In vitro reconstitution of biomolecular condensates.
  • Super-resolution imaging and single molecule tracking.
  • Surface tethering of condensates.
  • Computational simulations.

Main Results:

  • Tethering effectively suppresses global condensate motion without altering morphology.
  • Untethered condensates lead to overestimated diffusion coefficients, especially for structured RNAs.
  • Tethering strategies offer tunable control over condensate stability and dynamics.

Conclusions:

  • Surface tethering is a valuable approach for accurate quantification of intra-condensate molecular dynamics.
  • Provides a methodological framework for studying membraneless organelles.
  • Offers guidelines for experimental design based on condensate properties and molecular diffusion.