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DNA binding affinity of a macrocyclic copper(II) complex: Spectroscopic and molecular docking studies
Nahid Shahabadi1,2, Mohammad Hakimi3, Teimoor Morovati3
1a Inorganic Chemistry Department, Faculty of Chemistry , Razi University , Kermanshah , Iran.
A novel copper(II) complex interacts with calf thymus DNA (ct-DNA), primarily through groove binding. This interaction is supported by spectroscopic, competitive binding, and viscosity studies, with hydrogen bonds and van der Waals forces driving the reaction.
Area of Science:
- Coordination Chemistry
- Biophysical Chemistry
- Molecular Interactions
Background:
- Copper(II) complexes are investigated for their potential DNA-binding properties.
- Macrocyclic ligands offer unique coordination environments for metal ions.
- Understanding metal-DNA interactions is crucial for developing novel therapeutic agents.
Purpose of the Study:
- To investigate the interaction mechanism of a novel macrocyclic copper(II) complex with calf thymus DNA (ct-DNA).
- To characterize the binding mode and affinity of the copper(II) complex to ct-DNA.
- To elucidate the thermodynamic driving forces behind the complex-DNA interaction.
Main Methods:
- UV-Vis absorption spectroscopy to monitor spectral changes upon complexation.
- Competitive fluorescence studies using Hoechst 33258 to determine binding competition.
- Viscosity measurements to assess DNA structural alterations.
- Molecular docking simulations to predict binding modes.
- Thermodynamic analysis using the van't Hoff equation.
Main Results:
- The copper(II) complex exhibited hyperchromism and a blue shift in absorption spectra upon binding to ct-DNA.
- An intrinsic binding constant (Kb) of 1.25 × 10^4 M^-1 indicated groove binding.
- Competitive studies and viscosity measurements confirmed groove binding, with the complex displacing Hoechst 33258.
- Thermodynamic parameters revealed the significant role of hydrogen bonds and van der Waals forces.
Conclusions:
- The novel macrocyclic copper(II) complex binds to ct-DNA predominantly via groove binding.
- The interaction is characterized by favorable hydrogen bonding and van der Waals forces.
- Molecular docking results corroborated the experimental findings, supporting the proposed binding mechanism.
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