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This study reveals the structural details of copper(II)-mediated base pairs and their impact on DNA. Copper(II)-mediated base pairs can be incorporated into DNA duplexes without significant structural changes.

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Area of Science:

  • Coordination Chemistry
  • Biophysical Chemistry
  • Structural Biology

Background:

  • Copper(II) ions can be introduced into DNA via pyridine-2,6-dicarboxylate derivatives forming metal-mediated base pairs with nucleosides.
  • The structural characteristics and effects of these metalized base pairs on DNA structure remain largely uncharacterized.

Purpose of the Study:

  • To elucidate the structural details of individual copper(II)-mediated base pairs.
  • To investigate the structural impact of incorporating these metalized base pairs into DNA duplexes.
  • To validate the feasibility of including these modified base pairs in DNA structures.

Main Methods:

  • Synthesis and single-crystal X-ray diffraction of individual copper(II)-nucleoside complexes.
  • Ab initio computational calculations to model the incorporation of copper(II)-mediated base pairs into DNA duplexes.

Main Results:

  • The crystal structures of five individual copper(II)-mediated base pairs were determined.
  • Computational studies confirmed that copper(II)-mediated cytosine and guanine base pairs can be formed within DNA duplexes.
  • The presence of these copper(II)-mediated base pairs minimally alters the overall DNA double-helical structure.

Conclusions:

  • Copper(II)-mediated base pairs involving pyridine-2,6-dicarboxylate derivatives and canonical nucleosides exhibit distinct structural features.
  • These modified base pairs can be integrated into DNA duplexes without causing significant structural distortions.
  • This work provides structural insights into metal-mediated base pairing for potential applications in DNA nanotechnology and structural biology.