Rigid-body molecular dynamics of DNA inside a nucleosome

  • Arman Fathizadeh
  • Azim Berdy Besya
  • Mohammad Reza Ejtehadi
  • Helmut Schiessel
Regular Article

Abstract

The majority of eukaryotic DNA, about three quarter, is wrapped around histone proteins forming so-called nucleosomes. To study nucleosomal DNA we introduce a coarse-grained molecular dynamics model based on sequence-dependent harmonic rigid base pair step parameters of DNA and nucleosomal binding sites. Mixed parametrization based on all-atom molecular dynamics and crystallographic data of protein-DNA structures is used for the base pair step parameters. The binding site parameters are adjusted by experimental B-factor values of the nucleosome crystal structure. The model is then used to determine the energy cost for placing a twist defect into the nucleosomal DNA which allows us to use Kramers theory to calculate nucleosome sliding caused by such defects. It is shown that the twist defect scenario together with the sequence-dependent elasticity of DNA can explain the slow time scales observed for nucleosome mobility along DNA. With this method we also show how the twist defect mechanism leads to a higher mobility of DNA in the presence of sin mutations near the dyad axis. Finally, by performing simulations on 5s rDNA, 601, and telomeric base pair sequences, it is demonstrated that the current model is a powerful tool to predict nucleosome positioning.

Graphical abstract

Keywords

Living systems: Biological Matter 

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Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Arman Fathizadeh
    • 1
  • Azim Berdy Besya
    • 2
  • Mohammad Reza Ejtehadi
    • 3
  • Helmut Schiessel
    • 4
  1. 1.Institute for Nanoscience and NanotechnologySharif University of TechnologyTehranIran
  2. 2.Engineering Department AIRICTehranIran
  3. 3.Physics DepartmentSharif University of TechnologyTehranIran
  4. 4.Instituut-Lorentz for Theoretical PhysicsLeidenThe Netherlands

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