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Related Experiment Videos

Modeling DNA structure, elasticity, and deformations at the base-pair level.

Boris Mergell1, Mohammad R Ejtehadi, Ralf Everaers

  • 1Max-Planck-Institut für Polymerforschung, Postfach 3148, D-55021 Mainz, Germany. mergell@mpip-mainz.mpg.de

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|October 4, 2003
PubMed
Summary

We developed a generic DNA model at the base-pair level, revealing a B-DNA-like structure. This model accurately predicts DNA

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Area of Science:

  • Biophysics
  • Computational Biology
  • Molecular Modeling

Background:

  • Understanding DNA structure and mechanics is crucial for molecular biology.
  • Existing models often simplify DNA's complex interactions.
  • A base-pair level model is needed to capture fine-grained DNA behavior.

Purpose of the Study:

  • To present a generic, physics-based model of DNA at the base-pair level.
  • To investigate the conformational transitions of DNA under force.
  • To accurately reproduce experimentally observed DNA properties.

Main Methods:

  • Utilized a variant of the Gay-Berne potential for base-pair stacking interactions.
  • Incorporated sugar-phosphate backbones using semirigid harmonic springs.
  • Introduced geometrical constraints to achieve stable DNA conformations.

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  • Mapped the model to existing theoretical frameworks (Marko-Siggia, stack-of-plates) for parameter optimization.

    • Main Results:

    • The model successfully generated a right-handed B-DNA-like conformation.
    • Optimized parameters reproduced known DNA observables like persistence lengths and step parameters.
    • Determined the critical force for B-DNA to S-DNA transition at approximately 140 pN.
    • Observed an overstretched S-DNA conformation with inclined bases that retain partial base-pair stacking.

    Conclusions:

    • The generic DNA model provides a robust framework for studying DNA mechanics at the base-pair level.
    • The model accurately predicts DNA behavior under stretching, including the B- to S-DNA transition.
    • Findings offer insights into the structural plasticity of DNA under mechanical stress.