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Modeling high-resolution hydration patterns in correlation with DNA sequence and conformation.

M Feig1, B M Pettitt

  • 1Department of Chemistry and Institute for Molecular Design, University of Houston, 4800 Calhoun, Houston, TX, 77204-5641, USA.

Journal of Molecular Biology
|February 27, 1999
PubMed
Summary
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Molecular dynamics simulations reveal distinct hydration patterns around DNA. Water molecule distribution differs between A-DNA and B-DNA conformations, influencing DNA structural transitions.

Area of Science:

  • Biophysics
  • Computational Biology
  • Structural Biology

Background:

  • Understanding DNA hydration is crucial for elucidating its structural stability and function.
  • Previous studies have utilized molecular dynamics simulations to investigate DNA-water interactions.

Purpose of the Study:

  • To present high-resolution hydration patterns around the DNA fragment d(C5T5).(A5G5) using molecular dynamics simulations.
  • To compare hydration differences between A-DNA and B-DNA conformations and between different base pairs (C.G vs. T.A).
  • To correlate hydration patterns with DNA structural parameters and explain the B-to-A transition.

Main Methods:

  • Two molecular dynamics simulations of 10 and 12 ns were performed on the DNA fragment d(C5T5).(A5G5).
  • Simulations used both CHARMM and AMBER force fields in explicit solvent with counterions and 0.8 M NaCl.

Related Experiment Videos

  • Hydration patterns were analyzed using radial distribution functions and compared with crystallographic data.

    • Main Results:

    • B-DNA conformations were observed with AMBER force field, while A-DNA conformations were observed with CHARMM parameters.
    • High-resolution hydration patterns showed good agreement with crystallographic results, with discrepancies explained by conformational and sequence variations.
    • Fewer water molecules were bound to T.A base pairs and in A-DNA compared to B-DNA, offset by increased hydrophobic contacts.

    Conclusions:

    • The study provides detailed hydration insights for specific DNA conformations and sequences.
    • Simulation results align well with experimental crystallographic data, validating the simulation approach.
    • Hydration differences, particularly around T.A base pairs and in A-DNA, contribute to understanding the DNA B-to-A transition at low humidity.