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Ditopic binuclear copper(II) complexes for DNA cleavage.

Israel Carreira-Barral1, Miguel Riopedre-Fernández2, Andrés de Blas2

  • 1Universidade da Coruña, Centro de Investigaciones Científicas Avanzadas (CICA), Departamento de Química, Facultade de Ciencias, 15071 A Coruña, Galicia, Spain; Departamento de Química, Facultad de Ciencias, Universidad de Burgos, 09001 Burgos, Spain.

Journal of Inorganic Biochemistry
|January 20, 2020
PubMed
Summary
This summary is machine-generated.

New copper complexes with novel ligands show strong binding to phosphorylated anions and DNA. The [Cu2L2]4+ complex effectively cleaves plasmid DNA via a hydrolytic mechanism, indicating potential applications in molecular biology.

Keywords:
Anion recognitionBinuclear copper complexesDFT calculationsDNA cleavageDitopic receptors

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Area of Science:

  • Coordination Chemistry
  • Supramolecular Chemistry
  • Bioinorganic Chemistry

Background:

  • Development of ligands with di(2-picolyl)amine (DPA) units for metal complexation.
  • Investigation of urea-based linkers for creating binuclear metal complexes.
  • Exploration of metal complexes for anion binding and DNA interactions.

Purpose of the Study:

  • Synthesize and characterize novel binuclear copper(II) and zinc(II) complexes with DPA-containing ligands.
  • Evaluate the binding affinities of these complexes towards phosphorylated anions.
  • Investigate the interaction of copper complexes with deoxyribonucleic acid (DNA) and their DNA cleavage activity.

Main Methods:

  • Ligand synthesis and characterization (X-ray crystallography).
  • Preparation and isolation of binuclear Cu(II) and Zn(II) complexes.
  • Spectroscopic studies (UV-Vis, luminescence, circular dichroism) for anion and DNA binding.
  • DNA cleavage assays using pUC19 plasmid DNA.

Main Results:

  • Two ligands (L1 and L2) and their corresponding binuclear Cu(II) and Zn(II) complexes were synthesized.
  • X-ray structures revealed an unusual conformation in the L1 ligand and its copper complex.
  • Cu(II) complexes exhibited strong binding to pyrophosphate and AMP.
  • Complexes showed significant interaction with calf thymus DNA, binding to the minor groove.
  • [Cu2L2]4+ complex effectively cleaved supercoiled pUC19 plasmid DNA through hydrolysis.

Conclusions:

  • The synthesized ligands and their metal complexes offer unique structural features and binding capabilities.
  • The copper complexes demonstrate high affinity for specific phosphorylated anions.
  • The complexes interact strongly with DNA via the minor groove, with [Cu2L2]4+ exhibiting DNA cleavage activity.
  • These findings suggest potential applications in areas requiring selective anion recognition or DNA manipulation.