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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.
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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: Aug 20, 2025

Combining Single-molecule Manipulation and Imaging for the Study of Protein-DNA Interactions
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Probing DNA-protein interactions using single-molecule diffusivity contrast.

Hugh Wilson1, Miles Lee1, Quan Wang1

  • 1Lewis-Sigler Institute for Integrative Genomics, Princeton University, Princeton, New Jersey.

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|November 25, 2022
PubMed
Summary
This summary is machine-generated.

This study introduces diffusivity contrast to track single DNA molecules binding with unlabeled proteins in real time. This method offers a general way to determine protein binding states for enhanced biophysical studies.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Biochemistry

Background:

  • Single-molecule fluorescence is crucial for studying protein-nucleic acid interactions.
  • Current methods need robust real-time detection of binding states.

Purpose of the Study:

  • To establish diffusivity contrast as a general method for determining single DNA molecule binding states with unlabeled proteins.
  • To validate and extend this technique for biophysical analysis.

Main Methods:

  • Utilized drift-free single-molecule diffusivity measurements in an anti-Brownian electrokinetic trap.
  • Cross-validated the diffusivity method with protein-induced fluorescence enhancement.
  • Extended hydrodynamic modeling to correlate diffusivity with DNA-protein structures.

Main Results:

  • Demonstrated diffusivity contrast as a reliable readout for single DNA-protein binding states.
  • Achieved good agreement between measured and predicted diffusivity values.
  • Showcased simultaneous mapping of binding stoichiometry and location using combined techniques.

Conclusions:

  • Diffusivity contrast provides a versatile tool for real-time analysis of single-molecule protein-nucleic acid interactions.
  • Combining diffusivity contrast with fluorescence enhancement enables comprehensive characterization of DNA-protein complexes.
  • This approach has the potential to advance single-molecule biophysical studies.