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Synthesis, characterization, and DNA-binding studies of mononuclear copper(II)-phenanthroline-tyrosine complex
Pulimamidi R Reddy1, Pallerla Manjula
1Department of Chemistry, Osmania University, Hyderabad-500007, India, (phone: +91-40-27171664; fax: +91-40-27090020).
A novel copper(II) complex with L-tyrosine and phenanthroline was synthesized and studied for its interaction with calf thymus DNA (CT DNA). The complex exhibits DNA-binding properties, suggesting potential applications in medicinal inorganic chemistry.
Area of Science:
- Inorganic Chemistry
- Biophysical Chemistry
- Materials Science
Background:
- Copper complexes are investigated for their biological activities.
- Understanding metal-DNA interactions is crucial for developing novel therapeutic agents.
- Phenanthroline and amino acid ligands can modulate the properties of copper complexes.
Purpose of the Study:
- To synthesize and characterize a new mononuclear copper(II) complex.
- To investigate the interaction of the synthesized copper(II) complex with calf thymus DNA (CT DNA).
- To determine the binding mode and affinity of the complex to DNA.
Main Methods:
- Synthesis and structural characterization using elemental analysis, magnetic susceptibility, UV/VIS, IR, and EPR spectroscopy, and ESI mass spectrometry.
- Spectroscopic studies (absorption, fluorescence) to probe DNA binding.
- Thermal denaturation studies to assess DNA structural changes upon complexation.
Main Results:
- A mononuclear complex [Cu(II)(phen)(L-Tyr)(H(2)O)] was successfully synthesized.
- Electronic and EPR spectral data indicated a square-pyramidal geometry around Cu(II).
- The complex binds to CT DNA with an intrinsic binding constant (K(b)) of 3750 M⁻¹ and a Stern-Volmer quenching constant (K) of 0.39.
Conclusions:
- The synthesized copper(II) complex exhibits significant interaction with CT DNA.
- The binding mode suggests potential intercalation or groove binding.
- This study provides insights into the DNA-binding capabilities of copper(II) complexes with amino acid and phenanthroline ligands.
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