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Binuclear ruthenium complex linker length tunes DNA threading intercalation kinetics.

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Researchers optimized binuclear ruthenium complexes for DNA applications. A new complex with a longer linker shows higher DNA affinity and faster binding via a relieved threading intercalation mechanism.

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Area of Science:

  • Coordination Chemistry
  • Biophysical Chemistry
  • Molecular Biology

Background:

  • Binuclear ruthenium complexes are explored for DNA-targeting therapies and diagnostics.
  • Previous models optimized for reversible DNA-ligand assemblies with high affinity and slow kinetics.

Purpose of the Study:

  • Investigate a binuclear ruthenium complex with a longer semirigid linker using single-molecule force spectroscopy.
  • Characterize its DNA binding affinity, kinetics, and intercalation mechanism compared to a parent complex.

Main Methods:

  • Single-molecule force spectroscopy to probe DNA-ruthenium complex interactions.
  • Analysis of equilibrium and kinetic data to determine binding parameters.
  • Confocal fluorescence imaging to visualize intercalation patterns.

Main Results:

  • The new complex exhibits an order of magnitude higher DNA affinity than the parent complex.
  • Association rate is two orders of magnitude faster, with reduced DNA elongation needed for intercalation.
  • The complex elongates DNA by ~0.3 nm, altering the energy landscape and increasing persistence length.

Conclusions:

  • The longer linker facilitates a sterically relieved threading intercalation mechanism with intact DNA basepairs.
  • Rational design of ruthenium complexes allows tunable DNA intercalation for therapeutic and diagnostic applications.