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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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Visualizing Protein-DNA Interactions in Live Bacterial Cells Using Photoactivated Single-molecule Tracking
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Quantification of DNA-associated proteins inside eukaryotic cells using single-molecule localization microscopy.

Thomas J Etheridge1, Rémi L Boulineau1, Alex Herbert1

  • 1Genome Damage and Stability Centre, School of Life Sciences, University of Sussex, Falmer, Sussex, UK.

Nucleic Acids Research
|August 10, 2014
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Summary

Researchers developed a new microscopy method to visualize DNA-binding proteins in living cells. This technique tracks protein movement to distinguish DNA-bound molecules, advancing cell biology research.

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Area of Science:

  • Cell Biology
  • Microscopy
  • Molecular Biology

Background:

  • Single-molecule localization microscopy (SMLM) offers nanoscale precision for studying cellular structures and molecular mechanisms.
  • Current applications of SMLM in DNA replication and repair are mainly limited to in vitro studies and prokaryotic systems.
  • There is a need to extend these advanced imaging techniques to visualize molecular processes within unfixed eukaryotic cells.

Purpose of the Study:

  • To develop and validate a photo-activated localization microscopy (PALM)-based method for directly visualizing DNA-associated proteins in live eukaryotic cells.
  • To adapt SMLM techniques for studying DNA replication and repair mechanisms in their native cellular environment.
  • To enable the study of protein-DNA interactions across different cell cycle stages and genetic backgrounds.

Main Methods:

  • Development of a novel photo-activated localization microscopy (PALM) approach.
  • Utilizing the motion blurring of fluorescence signals caused by protein diffusion to selectively image DNA-bound proteins.
  • Designing and implementing a straightforward methodology for analyzing protein-DNA interactions in unfixed cells.

Main Results:

  • Successfully visualized DNA-associated proteins in unfixed eukaryotic cells using the developed PALM method.
  • Demonstrated that protein diffusivity, observed as motion blurring, can effectively isolate the DNA-bound protein population.
  • Showcased the method's ability to detect cell cycle-dependent and genetic background-specific changes in the DNA binding of Mcm4 and PCNA.

Conclusions:

  • The developed PALM-based methodology enables direct visualization of DNA-associated proteins in living eukaryotic cells.
  • This technique overcomes previous limitations by allowing in vivo analysis of protein-DNA interactions without fixation.
  • The study provides a powerful new tool for investigating DNA replication and repair dynamics in eukaryotes.