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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...

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Production and Targeting of Monovalent Quantum Dots
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Production and Targeting of Monovalent Quantum Dots

Published on: October 23, 2014

Lighting up individual DNA binding proteins with quantum dots.

Yuval Ebenstein1, Natalie Gassman, Soohong Kim

  • 1Department of Chemistry and Biochemistry, DOE Institute for Genomics and Proteomics, UCLA, Los Angeles, California 90095, USA. uv@chem.ucla.edu

Nano Letters
|March 18, 2009
PubMed
Summary

This study introduces a single-molecule method to visualize DNA-binding proteins. Fluorescent quantum dots enable nanometer-resolution mapping of protein locations on DNA, advancing gene regulation studies.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Genomics

Background:

  • Understanding DNA-protein interactions is crucial for gene expression and regulation.
  • Current methods may lack precision in determining protein binding sites on DNA.

Purpose of the Study:

  • To develop a single-molecule technique for direct visualization of proteins bound to DNA.
  • To achieve nanometer-resolution localization of protein-DNA binding events.

Main Methods:

  • Utilizing fluorescent quantum dots (QDs) for labeling DNA-binding proteins.
  • Linear extension and imaging of protein-DNA complexes.
  • Demonstration using T7-RNA polymerase on the T7 bacteriophage genome.

Main Results:

  • Successful detection of individual quantum dot-labeled T7-RNA polymerases.
  • Precise localization of protein binding sites on the DNA template.
  • Demonstrated multicolor, nanometer-resolution imaging capabilities.

Conclusions:

  • The proposed single-molecule approach offers precise mapping of protein-DNA interactions.
  • This method has potential for both reading and writing protein binding information on DNA.
  • Advances in visualizing molecular mechanisms of gene regulation.