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Stacking-induced fluorescence increase reveals allosteric interactions through DNA.

Michael J Morten1, Sergio G Lopez1, I Emilie Steinmark1

  • 1School of Chemistry, WestCHEM, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK.

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|October 3, 2018
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Summary
This summary is machine-generated.

Cyanine dyes, like Cy3, show increased fluorescence when stacked in DNA nicks or gaps. This stacking-induced fluorescence increase (SIFI) allows for single-molecule studies of DNA structure and dynamics.

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Area of Science:

  • Molecular Biology
  • Biophysics
  • Nanotechnology

Background:

  • Understanding DNA higher-order structure and dynamics is crucial for gene expression and nanotechnology.
  • Cyanine dyes are environment-sensitive and can be used to probe DNA.
  • Controlling DNA requires detailed knowledge of its structure and dynamics.

Purpose of the Study:

  • To utilize the photoisomerization of cyanine dyes to probe DNA structure and dynamics.
  • To investigate the phenomenon of stacking-induced fluorescence increase (SIFI).
  • To explore through-backbone allosteric interactions in DNA.

Main Methods:

  • Covalent attachment of Cy3 dye to DNA.
  • Monitoring fluorescence intensity and lifetime changes.
  • Single-molecule studies of DNA hairpin hybridization dynamics.
  • Investigating the effect of abasic sites on dye-DNA interactions.

Main Results:

  • Cy3 dye shows enhanced fluorescence intensity and lifetime when stacked in DNA nicks, gaps, or overhangs.
  • SIFI was successfully used to probe DNA hairpin hybridization dynamics at the single-molecule level.
  • Abasic sites up to 20 base pairs away modulated dye-DNA interactions, indicating allosteric effects.

Conclusions:

  • SIFI is a powerful phenomenon for studying DNA structure, dynamics, and reactivity.
  • This method offers a new tool for nucleic acid research.
  • The findings suggest widespread applicability in molecular biology and nanotechnology.