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A highly stabilizing silver(I)-mediated base pair in parallel-stranded DNA.

Indranil Sinha1, Célia Fonseca Guerra, Jens Müller

  • 1Westfälische Wilhelms-Universität Münster, Institut für Anorganische und Analytische Chemie & NRW Graduate School of Chemistry, Corrensstrasse 28/30, 48149 Münster (Germany).

Angewandte Chemie (International Ed. in English)
|January 30, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created the first parallel-stranded DNA duplex using Hoogsteen base pairing and an incorporated silver ion (Ag+). This novel metal-mediated base pair, 6-furylpurine-Ag(+)-6-furylpurine, significantly stabilizes DNA structures.

Keywords:
bioinorganic chemistrymetal-mediated base pairparallel-stranded DNApurinessilver

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Area of Science:

  • Synthetic biology
  • Supramolecular chemistry
  • Nucleic acid chemistry

Background:

  • DNA typically forms antiparallel strands with Watson-Crick base pairing.
  • Hoogsteen base pairing allows for alternative DNA structures, including parallel strands.
  • Metal ions can mediate base pairing in nucleic acids, influencing stability.

Purpose of the Study:

  • To engineer a novel parallel-stranded DNA duplex incorporating a metal ion.
  • To investigate the formation and stability of a silver ion-mediated base pair in parallel DNA.
  • To explore the use of artificial nucleobases for metal-mediated base pairing.

Main Methods:

  • Synthesis of the artificial nucleobase 6-furylpurine (6FP).
  • Formation of parallel-stranded DNA duplexes containing 6FP.
  • Characterization using temperature-dependent UV spectroscopy, circular dichroism (CD) spectroscopy, and density functional theory (DFT) calculations.

Main Results:

  • Successfully created the first parallel-stranded DNA duplex with Hoogsteen base pairing incorporating a silver ion (Ag+).
  • Devised the 6-furylpurine-Ag(+)-6-furylpurine (6FP-Ag(+)-6FP) base pair, demonstrating high stabilization.
  • The 6FP nucleobase can form metal-mediated base pairs via Watson-Crick or Hoogsteen edges, adaptable to DNA structure and conditions.
  • The 6FP-Ag(+)-6FP base pair in parallel DNA is the most stabilizing Ag(+)-mediated pair reported, increasing melting temperature by ~15°C.

Conclusions:

  • The 6FP-Ag(+)-6FP base pair represents a significant advancement in creating stable, metal-mediated DNA structures.
  • This work expands the possibilities for designing artificial nucleic acids with tailored properties.
  • The ability of 6FP to mediate base pairing through different edges offers versatile applications in DNA nanotechnology and synthetic biology.