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DNA condensation by multivalent cations

V A Bloomfield1

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

Biopolymers
|January 1, 1997
PubMed
Summary
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High molecular weight DNA condenses into compact toroids with multivalent cations. This process is driven by ion and water interactions, overcoming electrostatic repulsion and entropy loss.

Area of Science:

  • Biophysics
  • Molecular Biology
  • Polymer Science

Background:

  • High molecular weight DNA undergoes significant condensation in the presence of multivalent cations.
  • This condensation results in compact, ordered toroidal structures.

Purpose of the Study:

  • To review the phenomenon of DNA condensation, including condensing agents, morphology, kinetics, and reversibility.
  • To summarize the statistical mechanics governing polymer collapse and favored DNA structures.
  • To discuss the intermolecular forces and energetic contributions driving DNA condensation.

Main Methods:

  • Overview of DNA condensation processes.
  • Summary of statistical mechanics principles for stiff polymers.
  • Survey of experimental evidence and force measurements.

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Main Results:

  • DNA condensation is an abrupt process favoring toroidal structures, explained by polymer mechanics.
  • Condensation occurs when approximately 90% of DNA's charge is neutralized by counterions.
  • Intermolecular forces, particularly ion-water interactions, dominate the condensation free energy, which is minimal per base pair.

Conclusions:

  • DNA condensation is a complex interplay of entropy, stiffness, electrostatic forces, and hydration effects.
  • Multivalent cations, high salt concentrations, and water structure are crucial for overcoming electrostatic repulsion.
  • Undulations and ion-induced structural modifications of DNA influence the condensation process.