DNA interaction and efficient antimicrobial activities of 4N chelating metal complexes
S Packianathan1, T Arun1, N Raman1
1Research Department of Chemistry, VHNSN College, Virudhunagar 626 001, India.
Summary
New metal(II) complexes with a Schiff base ligand were synthesized and studied for DNA binding. These complexes intercalate into calf thymus DNA (CT DNA) and show enhanced biological activities.
Area of Science:
- Coordination Chemistry
- Biophysical Chemistry
- Materials Science
Background:
- Schiff base ligands are versatile building blocks in coordination chemistry.
- Metal complexes can interact with DNA, influencing biological processes.
- Understanding DNA-metal complex interactions is crucial for developing new therapeutic agents.
Purpose of the Study:
- To synthesize and characterize novel metal(II) complexes using a symmetric Schiff base ligand.
- To investigate the DNA binding modes and affinities of these metal complexes.
- To evaluate the biological activities and DNA cleavage potential of the synthesized complexes.
Main Methods:
- Synthesis and characterization of metal(II) complexes via condensation reactions.
- Spectroscopic techniques (UV-Vis., circular dichroism, fluorescence emission) for DNA binding studies.
- Viscosity measurements and gel electrophoresis for DNA interaction and cleavage analysis.
Main Results:
- Octahedral geometry was confirmed for all synthesized metal(II) complexes.
- Complexes bind to calf thymus DNA (CT DNA) via intercalative mode, supported by spectral and viscosity data.
- Intrinsic binding constants varied among complexes, with Co(II) showing the highest affinity (1.8×10^5 M⁻¹).
- Complexes demonstrated DNA cleavage activity in the presence of peroxide and enhanced biological activities compared to the free ligand.
Conclusions:
- The synthesized Schiff base metal(II) complexes effectively interact with DNA through intercalation.
- These complexes hold potential as DNA-targeting agents due to their binding affinities and cleavage capabilities.
- The enhanced biological activities suggest therapeutic applications for these novel coordination compounds.
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