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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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Related Experiment Video

Updated: Jun 8, 2025

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
14:43

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions

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Single-molecule dynamic structural biology with vertically arranged DNA on a fluorescence microscope.

Alan M Szalai1,2, Giovanni Ferrari3, Lars Richter3

  • 1Department of Chemistry and Center for NanoScience, Ludwig-Maximilians-Universität München, Munich, Germany. alan.szalai@cup.uni-muenchen.de.

Nature Methods
|November 8, 2024
PubMed
Summary

A new method called graphene energy transfer with vertical nucleic acids (GETvNA) allows dynamic, high-resolution imaging of DNA and protein interactions. This technique reveals DNA structural changes and protein movements at the Ångström scale.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Nanotechnology

Background:

  • Understanding DNA-protein interactions is crucial for fundamental biological processes like DNA replication, transcription, and repair.
  • Dynamic nanoscale observations are needed to elucidate the mechanisms of these interactions.
  • Existing methods often lack the required spatial and temporal resolution for dynamic studies.

Purpose of the Study:

  • To introduce a novel method, graphene energy transfer with vertical nucleic acids (GETvNA), for observing DNA-protein interactions at the nanoscale.
  • To achieve high spatial (Ångström scale) and temporal (subsecond) resolution in studying dynamic DNA conformational changes.
  • To investigate specific DNA structural features and protein binding events.

Main Methods:

  • Utilizing the vertical orientation of double-stranded DNA on graphene surfaces.
  • Employing Förster Resonance Energy Transfer (FRET) from a probe dye to graphene.
  • Achieving nanoscale spatial resolution and subsecond temporal resolution for dynamic observations.

Main Results:

  • Successfully measured DNA bending induced by structural anomalies (adenine tracts, bulges, abasic sites) and protein binding (endonuclease IV).
  • Observed the translocation of O6-alkylguanine DNA alkyltransferase on DNA with single base-pair resolution.
  • Detected preferential binding of the O6-alkylguanine DNA alkyltransferase to adenine tracts.

Conclusions:

  • The GETvNA method provides unprecedented dynamic insights into nucleic acid and DNA-protein interactions.
  • This technique achieves resolution comparable to traditional structural biology methods but in a dynamic context.
  • GETvNA is poised for broad application in studying dynamic biological processes involving DNA and proteins.