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DNA interaction with biologically active divalent metal ions: binding constants calculation.

Elene V Hackl1, Vladimir L Galkin, Yurij P Blagoi

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

International Journal of Biological Macromolecules
|November 24, 2004
PubMed
Summary

Divalent metal ions like Cu2+, Mn2+, and Ca2+ induce DNA to transition into a compact state in solution. Calculations reveal DNA can undergo first-order or sigmoidal phase transitions depending on ion interactions and molecular assembly.

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Area of Science:

  • Biophysics
  • Physical Chemistry
  • Molecular Biology

Background:

  • Previous research demonstrated that divalent metal ions (Cu2+, Mn2+, Ca2+) induce DNA condensation in aqueous solutions.
  • Understanding the precise mechanisms and thermodynamic parameters governing these DNA structural transitions is crucial.

Purpose of the Study:

  • To computationally determine binding constants for divalent metal ions interacting with DNA.
  • To develop a theoretical framework for calculating binding constants and cooperativity parameters.
  • To analyze the nature of phase transitions (first-order vs. sigmoidal) during DNA coil-to-globule state changes.

Main Methods:

  • Utilized the macromolecule statistical sum approach for theoretical calculations.
  • Developed and applied a novel formula for calculating binding constants and cooperativity parameters.

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  • Modeled DNA transitions from a coil state to a compact (globule) state.

    • Main Results:

    • Calculated binding constants for divalent metal ion interactions with DNA.
    • Proposed a formula for quantifying binding constants and cooperativity.
    • Demonstrated that single DNA molecules may exhibit first-order phase transitions, while assemblies show sigmoidal transitions.

    Conclusions:

    • The study provides a theoretical basis for understanding metal ion-induced DNA condensation.
    • The nature of the DNA phase transition is dependent on molecular assembly and ion cooperativity.
    • Findings contribute to the understanding of DNA structural dynamics and interactions with cations.