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Efficient DNA binding by optically Pure Ruthenium Tris(bipyridyl) complexes incorporating carboxylic functionalities.
Régis Caspar1, Léna Musatkina, Alexander Tatosyan
1Université Paris 6, Pierre et Marie Curie, 4 place Jussieu, case 42, 75252 Paris Cedex 05, France.
Inorganic Chemistry
|December 8, 2004
Summary
Ruthenium complexes with bipyridine ligands bind to DNA, with specific enantiomers showing selective DNA cleavage. Racemic mixtures form self-associated supramolecular structures via hydrogen bonding.
Area of Science:
- Coordination Chemistry
- Bioinorganic Chemistry
- Supramolecular Chemistry
Background:
- Ruthenium complexes are investigated for their potential interactions with DNA.
- Optically pure enantiomers and racemic mixtures of ruthenium-bipyridine complexes offer distinct structural and reactive properties.
Purpose of the Study:
- To investigate the DNA binding affinities of enantiomerically pure ruthenium complexes.
- To explore the enantioselective DNA cleavage capabilities of these complexes.
- To characterize the self-assembly behavior of racemic ruthenium complexes.
Main Methods:
- (1)H NMR spectroscopy for DNA binding constant determination.
- 2D transferred NOESY (TRNOESY) experiments to study complex-DNA interactions.
- Gel electrophoresis to assess DNA cleavage.
- Infrared (IR) spectroscopy and X-ray crystallography to analyze supramolecular structures.
Main Results:
- Enantiomeric ruthenium complexes (Delta-1 and Lambda-1) exhibit DNA binding with intermediate-to-fast exchange kinetics.
- The Delta-2 enantiomer demonstrates light-dependent, enantioselective DNA cleavage, while Lambda-2 does not.
- Racemic ruthenium complexes (rac-2) form stable one-dimensional supramolecular chains through strong intermolecular hydrogen bonding.
Conclusions:
- Ruthenium-bipyridine complexes can bind to DNA, with enantioselectivity influencing biological activity.
- The Delta-2 enantiomer shows promise as a DNA-cleaving agent.
- Strong self-association in racemic mixtures, driven by hydrogen bonding, leads to unique supramolecular architectures.
