Interaction of anticancer Ru(III) complexes with single stranded and duplex DNA model systems.

Area of Science:

• Inorganic Chemistry
• Bioinorganic Chemistry
• Medicinal Chemistry

Background:

• Ruthenium(III) complexes are investigated for anticancer properties.
• NAMI-A is an antimetastatic agent in clinical trials.
• Understanding metal-DNA interactions is crucial for drug development.

Purpose of the Study:

• To investigate the interaction of AziRu and NAMI-A with DNA model systems.
• To compare the reactivity of AziRu and NAMI-A with oligonucleotides.
• To elucidate the binding modes and stability of ruthenium-DNA adducts.

Main Methods:

• Absorption UV-Vis spectroscopy to monitor ligand exchange.
• Circular Dichroism (CD) spectroscopy for conformational changes.
• Electrospray Mass Spectrometry (ESI-MS) to detect adducts.
• UV- and CD-monitored thermal denaturation for DNA stability.

Main Results:

• Both AziRu and NAMI-A interact with single-stranded and duplex oligonucleotides.
• Ruthenium complexes form stable adducts with guanine-containing DNA.
• AziRu and NAMI-A exhibit distinct reactivity patterns with DNA sequences.
• Ligand exchange and incorporation of ruthenium fragments into DNA were observed.

Conclusions:

• AziRu and NAMI-A bind to DNA model systems through different mechanisms.
• The study highlights the differential reactivity of structurally similar Ru(III) complexes.
• Findings provide insights into the molecular basis of their potential anticancer activity.