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A Highly Fluorescent Nucleobase Molecular Rotor.

Ashkan Karimi1,2, Richard Börner1,3, Guillaume Mata1

  • 1Department of Chemistry, University of Zurich, CH-8057 Zurich, Switzerland.

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|August 14, 2020
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Summary

Researchers developed the brightest fluorescent base analog (FBA) yet, named tsT. This molecular rotor offers superior sensitivity for detecting DNA structural dynamics and mismatches.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biophysics

Background:

  • Fluorescent base analogs (FBAs) are crucial for studying nucleic acid structure and dynamics.
  • Existing FBAs often lack sufficient brightness, limiting detection sensitivity.

Purpose of the Study:

  • To develop a novel FBA with enhanced brightness and molecular rotor properties.
  • To create a sensitive probe for detecting local dynamic motions and base pair mismatches in DNA.

Main Methods:

  • Synthesis and characterization of a new trans-stilbene annulated uracil derivative (tsT).
  • Measurement of fluorescence emissions and quantum yields in various solvents.
  • Assessment of sensitivity to mechanical motions in duplex DNA using fluorescence spectroscopy.
  • Time-correlated single photon counting to determine fluorescence lifetimes and anisotropy decay.

Main Results:

  • tsT exhibits exceptionally bright fluorescence across different solvents.
  • tsT demonstrates high sensitivity to mechanical motions in duplex DNA.
  • tsT shows a 28-fold increase in fluorescence intensity when base-paired with adenine (A) compared to thymine (T) or cytosine (C).
  • Fluorescence lifetime measurements distinguish between well-matched DNA and mismatched regions.

Conclusions:

  • tsT is the brightest FBA reported to date, functioning as an effective molecular rotor.
  • Its unique photophysical properties enable highly sensitive detection of DNA dynamics and mismatches.
  • tsT represents a significant advancement for nucleic acid research and diagnostics.