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DNA hydration studied by neutron fiber diffraction

W Fuller1, V T Forsyth, A Mahendrasingam

  • 1Department of Physics, Keele University, Staffordshire, United Kingdom.

Basic Life Sciences
|January 1, 1996
PubMed
Summary
This summary is machine-generated.

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Neutron diffraction reveals distinct water patterns around DNA double-helix conformations. This research highlights the crucial interplay between deoxyribonucleic acid (DNA), water, and ions in structural transitions.

Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • Understanding the hydration shell of deoxyribonucleic acid (DNA) is crucial for its structural integrity and function.
  • Previous X-ray diffraction studies provided insights but lacked detailed information on water molecule locations.
  • Neutron diffraction offers complementary sensitivity to light atoms like water.

Purpose of the Study:

  • To develop and apply neutron high-angle fiber diffraction for precise localization of water molecules around the DNA double-helix.
  • To compare hydration patterns in different DNA conformations (D and A forms).
  • To integrate hydration data with ion distribution for a holistic view of the DNA-water-ion system.

Main Methods:

  • Neutron high-angle fiber diffraction was performed on DNA samples.

Related Experiment Videos

  • Experiments utilized the D19 diffractometer (Institut Laue-Langevin) and SXD diffractometer (Rutherford Appleton ISIS).
  • Data were combined with X-ray diffraction data on alkali metal cation locations.

    • Main Results:

    • Direct evidence for bound water molecules closely associated with the DNA double-helix was obtained.
    • Distinct and conformation-specific hydration patterns were observed for the D and A DNA forms.
    • These hydration patterns differ from those seen in X-ray studies of oligodeoxynucleotides.

    Conclusions:

    • Neutron fiber diffraction is a powerful technique for mapping DNA hydration.
    • The study emphasizes the integrated nature of DNA, water, and ions, crucial for DNA structure.
    • Understanding these interactions provides a basis for explaining DNA conformational changes induced by water and ion concentration.