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Urea effect on Cu(2+)-induced DNA structural transitions in solution.

Elene V Hackl1, Yurij P Blagoi

  • 1B.I. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, 47 Lenin Ave., 61164 Kharkov, Ukraine. o.hackl@umist.ac.uk

Journal of Inorganic Biochemistry
|November 4, 2004
PubMed
Summary

Copper(II) ions induce DNA compaction in aqueous solutions, a process influenced by urea concentration. Urea affects DNA binding and compaction cooperativity, suggesting solvation effects are crucial.

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Area of Science:

  • Biophysical Chemistry
  • Molecular Biology
  • Spectroscopy

Background:

  • Copper(II) ions are known to interact with DNA.
  • Urea is a chaotropic agent that can alter solution properties and biomolecular interactions.

Purpose of the Study:

  • To investigate the effect of urea on Cu(2+) ion interaction with DNA.
  • To elucidate the mechanism of Cu(2+)-induced DNA compaction in the presence of urea.

Main Methods:

  • Infrared (IR) spectroscopy was used to study Cu(2+)-DNA interactions.
  • Varying concentrations of urea (0-5 M) were employed in aqueous solutions.

Main Results:

  • Cu(2+) binding induces DNA transition to a compact form with positive cooperativity.

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  • Urea addition decreases the required Cu(2+) concentration for compaction and alters the binding constant, peaking at 2 M urea.
  • Solvation effects, not just dielectric changes, significantly influence Cu(2+)-induced DNA compaction.
  • Urea decreases the cooperativity of DNA compaction, potentially due to disruption of water structure around DNA.

    • Conclusions:

    • Cu(2+)-induced DNA compaction is a complex process influenced by both electrostatic and solvation effects.
    • Urea modulates Cu(2+)-DNA binding and compaction, highlighting the role of solution environment.
    • The ordered structure of water adjacent to DNA plays a role in the cooperativity of compaction.