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Related Concept Videos

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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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Single Particle Tracking of Genetically Encoded Nanoparticles: Optimizing Expression for Cytoplasmic Diffusion

Elizaveta Korunova1, Vitali Sikirzhystki1, Jeffery L Twiss2

  • 1Department of Drug Discovery & Biomedical Sciences, College of Pharmacy, University of South Carolina Columbia, SC 29208, USA.

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Summary

Optimizing the expression of 40-nm genetically encoded nanoparticles (GEMs) in mammalian cells enhances cytoplasmic diffusivity measurements. This improved tracking reveals insights into cellular homeostasis and particle motion dynamics.

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Area of Science:

  • Cellular and Molecular Biophysics
  • Nanotechnology in Biology
  • Cytoplasmic Dynamics

Background:

  • Single particle tracking (SPT) probes cytoplasmic physical properties using fluorescent nanoparticles.
  • Genetically encoded nanoparticles (GEMs) offer a unique tool for studying cytoplasm, mimicking ribosome and protein complex sizes.
  • Cytoplasmic viscosity is crucial for cellular homeostasis, but GEM expression effects on diffusivity are poorly understood.

Purpose of the Study:

  • To optimize tracking of 40-nm GEMs in mammalian cells.
  • To investigate the impact of GEM expression levels on cytoplasmic diffusivity.
  • To refine GEMs diffusivity analysis methods.

Main Methods:

  • Construction and comparison of doxycycline-inducible and constitutive GEM expression systems.
  • Single particle tracking (SPT) of GEMs in mammalian cells.
  • Analysis of GEM diffusivity using effective diffusion coefficient and displacement standard deviations.

Main Results:

  • Optimized GEM expression increased measured diffusivity from 0.29 ± 0.02 μm²/sec to 0.35 ± 0.02 μm²/sec.
  • Improved homogeneity in cell populations and enhanced particle tracking facilitated analysis.
  • Refined analytical methods provided better assessment of motion types and heterogeneity.

Conclusions:

  • Controlled GEM expression levels optimize SPT for studying cytoplasmic properties.
  • GEMs are valuable tools for investigating cytoplasmic viscosity and its role in cellular functions.
  • Advanced analysis methods improve the characterization of particle diffusion and motion heterogeneity.