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Caught in the Loop: Binding of the [Ru(phen)2 (dppz)]2+ Light-Switch Compound to Quadruplex DNA in Solution Informed

Stephen J Devereux1, Fergus E Poynton2,3, Frederico R Baptista1

  • 1School of Chemistry, University College Dublin, Dublin, 4, Ireland.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|July 30, 2020
PubMed
Summary

Ultrafast time-resolved infrared spectroscopy reveals how a ruthenium complex binds to guanine quadruplex DNA. This study clarifies guanine base stacking and loop interactions in biologically relevant DNA structures.

Keywords:
light switchquadruplex bindingruthenium polypyridyltime-resolved spectroscopy

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Area of Science:

  • Biophysical Chemistry
  • Molecular Biophysics
  • Spectroscopy

Background:

  • Guanine quadruplexes (G4s) are crucial DNA structures involved in various biological processes.
  • The [Ru(phen)2(dppz)]2+ complex, a 'light-switch' agent, is used to probe DNA structures.
  • Understanding the binding interactions of such complexes with G4s is vital for developing therapeutic strategies.

Purpose of the Study:

  • To investigate the binding site of the [Ru(phen)2(dppz)]2+ complex with Oxytricha nova and human telomere G4 structures.
  • To elucidate the roles of guanine base stacking and loop interactions in the binding process.
  • To analyze the influence of K+ and Na+ ions on the complex-G4 interactions.

Main Methods:

  • Utilized ultrafast time-resolved infrared (TRIR) spectroscopy.
  • Simultaneously monitored the 'dark' and 'bright' states of the ruthenium complex.
  • Observed quadruplex nucleobase vibrations via a Stark effect induced by the complex's excited state.

Main Results:

  • TRIR spectroscopy successfully mapped the binding site of the [Ru(phen)2(dppz)]2+ complex on both bimolecular and intramolecular G4s.
  • Quantified the contributions of guanine base stacking and loop interactions to the binding.
  • Observed a significant thymine signal in the Na+-containing human telomere G4, suggesting specific interactions in the anti-parallel conformation.

Conclusions:

  • TRIR spectroscopy is a powerful tool for studying DNA-drug interactions at the molecular level.
  • The study provides detailed insights into the binding mechanism of the [Ru(phen)2(dppz)]2+ complex with G4s.
  • Findings highlight the sequence- and ion-dependent nature of G4 recognition and binding.