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Amide Coupling Reaction for the Synthesis of Bispyridine-based Ligands and Their Complexation to Platinum as Dinuclear Anticancer Agents
Published on: May 28, 2014
Synthesis, structural characterization, and quadruplex DNA binding studies of platinum(II)-terpyridine complexes
Kogularamanan Suntharalingam1, Andrew J P White, Ramon Vilar
1Department of Chemistry, Imperial College London, London SW7 2AZ, UK.
Inorganic Chemistry
|September 5, 2009
Summary
New platinum(II) complexes with terpyridine ligands strongly bind to quadruplex DNA. These compounds show modest selectivity for quadruplex DNA over duplex DNA, indicating potential therapeutic applications.
Area of Science:
- Coordination Chemistry
- Supramolecular Chemistry
- Biophysical Chemistry
Background:
- Terpyridine ligands and their metal complexes are known for their diverse applications.
- Platinum(II) complexes are of interest due to their biological activities, including anticancer properties.
- Quadruplex DNA structures are increasingly recognized as potential therapeutic targets.
Purpose of the Study:
- To synthesize and characterize novel substituted terpyridine ligands and their platinum(II) complexes.
- To investigate the DNA binding interactions of these complexes, focusing on quadruplex DNA.
- To evaluate the selectivity of these complexes for quadruplex DNA over duplex DNA.
Main Methods:
- Synthesis and full characterization of ligands and platinum(II) complexes.
- X-ray crystallography for structural determination.
- Fluorescent Indicator Displacement (FID) assays.
- Surface Plasmon Resonance (SPR) spectroscopy.
- Circular Dichroism (CD) spectroscopy.
Main Results:
- Three new terpyridine ligands and their platinum(II) complexes were successfully prepared and characterized.
- The compounds exhibit pi-pi stacking interactions in solid state and solution.
- Strong interactions with quadruplex DNA (HTelo and c-myc sequences) were observed, with binding constants up to 10^6.
- Moderate selectivity (one order of magnitude) for quadruplex DNA over duplex DNA was demonstrated.
Conclusions:
- The novel platinum(II)-terpyridine complexes effectively interact with quadruplex DNA.
- These complexes display a degree of selectivity for quadruplex DNA, particularly the c-myc sequence.
- The findings suggest potential for developing these compounds as agents targeting quadruplex DNA structures.
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