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DNA condensation in two dimensions.

I Koltover1, K Wagner, C R Safinya

  • 1Materials Department, Physics Department, and Biochemistry and Molecular Biology Program, University of California, Santa Barbara, CA 93106, USA.

Proceedings of the National Academy of Sciences of the United States of America
|December 20, 2000
PubMed
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Divalent ions like calcium and magnesium can condense anionic DNA on cationic surfaces, forming a highly compact state. This surface effect, unlike in bulk solutions, reverses electrostatic forces, enabling new DNA storage applications.

Area of Science:

  • Biophysics
  • Materials Science
  • Nanotechnology

Background:

  • Biological systems utilize multivalent cations (Z ≥ 3) to condense anionic DNA.
  • In bulk solutions, divalent ions (Z = 2) typically maintain repulsive forces between DNA strands.
  • Surface confinement significantly alters intermolecular forces and DNA behavior.

Purpose of the Study:

  • To investigate the effect of divalent electrolyte counterions on anionic DNA confined to cationic surfaces.
  • To explore the transition from repulsive to attractive electrostatic forces between surface-bound DNA.
  • To characterize the condensed DNA phase and its potential applications.

Main Methods:

  • Synchrotron X-ray diffraction
  • Optical absorption experiments

Related Experiment Videos

  • Confined DNA system on cationic surfaces

    • Main Results:

    • Divalent counterions (Ca2+, Mg2+, Mn2+) induce condensation of anionic DNA on cationic surfaces.
    • Electrostatic forces between adsorbed DNA chains transition from repulsive to attractive above a critical divalent ion concentration.
    • A novel condensed DNA phase forms, featuring a 1D counterion liquid trapped between DNA chains (0.63 ions/bp).

    Conclusions:

    • Spatial dimensionality is crucial for intermolecular interactions, enabling divalent ions to induce DNA condensation on surfaces.
    • This surface-induced condensation represents the most compact DNA state observed in vitro.
    • Potential applications include high-density genetic information storage and organo-metallic materials processing.