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Salt-induced DNA-histone complexation.

K K Kunze1, R R Netz

  • 1Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany.

Physical Review Letters
|November 4, 2000
PubMed
Summary
This summary is machine-generated.

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We numerically studied semiflexible charged polymer binding to a sphere, finding complete wrapping only at intermediate salt concentrations. High salt causes dewrapping, while low salt leads to extended DNA configurations.

Area of Science:

  • Biophysics
  • Polymer Physics
  • Computational Biology

Background:

  • DNA-histone interactions are crucial for chromatin structure.
  • Understanding polymer-surface binding is key in biological systems.

Purpose of the Study:

  • To numerically investigate the binding of a semiflexible charged polymer to an oppositely charged sphere.
  • To elucidate the role of salt concentration on polymer-sphere complex formation and stability.

Main Methods:

  • Numerical simulations of a semiflexible charged polymer interacting with a charged sphere.
  • Analysis of polymer conformation and binding states across varying salt concentrations.

Main Results:

  • Complete polymer wrapping observed only at intermediate salt concentrations, matching experimental findings.

Related Experiment Videos

  • High salt concentrations induce a sharp, discontinuous dewrapping transition.
  • Low salt concentrations result in multiple conformational transitions and extended polymer configurations.
  • Four distinct wrapped states were identified, characterized by broken rotational and mirror symmetries.

    • Conclusions:

    • Salt concentration critically dictates the binding and dewrapping behavior of charged polymers on spherical surfaces.
    • The study reveals complex conformational dynamics and symmetry breaking in polymer-DNA complexes.
    • Numerical findings provide insights into DNA-histone complex formation and stability.