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DNA bending by small, mobile multivalent cations

I Rouzina1, V A Bloomfield

  • 1Department of Biochemistry, University of Minnesota, St. Paul 55108, USA.

Biophysical Journal
|June 23, 1998
PubMed
Summary
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Multivalent cations can bend DNA by binding to the B-DNA major groove, causing electrostatic attraction and groove closure. This forms a stable "bending polaron," leading to significant DNA bending dependent on cation concentration and electrostatic interactions.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Structural Biology

Background:

  • DNA bending is crucial for various biological processes.
  • The role of multivalent cations in modulating DNA structure is complex.
  • Understanding cation-DNA interactions is key to deciphering DNA dynamics.

Purpose of the Study:

  • To propose and investigate a novel electrostatic mechanism for cation-induced DNA bending.
  • To elucidate the role of multivalent cations in DNA structural modulation.
  • To quantify the parameters influencing cation-mediated DNA bending.

Main Methods:

  • Theoretical modeling of electrostatic interactions between cations and DNA.
  • Adiabatic approximation to treat dynamic cation-DNA interactions.

Related Experiment Videos

  • Free energy calculations including electrostatic, elastic, and entropic components.

    • Main Results:

    • A purely electrostatic mechanism for DNA bending by multivalent cations is proposed.
    • Cation binding in the B-DNA major groove induces bending via electrostatic attraction and groove closure.
    • Formation of a stable 'bending polaron' with predicted large (20-40 degrees), smooth bends over ~6 base pairs.

    Conclusions:

    • Multivalent cations can induce significant DNA bending through a self-localization mechanism.
    • The bending is dependent on cation concentration, electrostatic strength, and DNA sequence.
    • This mechanism offers a new perspective on DNA structural dynamics and cation interactions.