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Dynamical Disorder in the DNA Hydration Shell.

Elise Duboué-Dijon1,2, Aoife C Fogarty1,2, James T Hynes1,2,3

  • 1École Normale Supérieure, PSL Research University, UPMC Univ Paris 06, CNRS, Département de Chimie, PASTEUR, 24 rue Lhomond, 75005 Paris, France.

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This summary is machine-generated.

Water dynamics near DNA are complex, influenced by groove shape and DNA movement. These factors create distinct hydration shell behaviors, crucial for DNA

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Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Water molecules in DNA hydration shells are vital for biochemical functions.
  • Understanding water dynamics is key to DNA's biological roles.

Purpose of the Study:

  • Investigate water molecule reorientation and hydrogen-bond dynamics in a B-DNA dodecamer hydration shell.
  • Elucidate sources of heterogeneity in hydration shell dynamics.

Main Methods:

  • Molecular dynamics simulations.
  • Analytic jump model.
  • Analysis of spatial and temporal heterogeneity.

Main Results:

  • Identified spatial heterogeneity in hydration shell dynamics, linked to DNA topography and H-bonds.
  • Observed significantly slower water dynamics in the minor groove.
  • Found DNA conformational fluctuations modulate water dynamics, especially in the minor groove.

Conclusions:

  • Biomolecular conformational fluctuations are essential for water motion in confined DNA sites.
  • The assumption of faster hydration shell dynamics than DNA dynamics is invalid.
  • DNA groove dynamics directly impact and accelerate water hydrogen-bond rearrangements.