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Related Experiment Videos

Intermolecular interactions and water structure in a condensed phase B-DNA crystal.

G R Clark1, C J Squire, L J Baker

  • 1Chemistry Department, University of Auckland, Auckland, New Zealand.

Nucleic Acids Research
|February 10, 2000
PubMed
Summary

Controlled dehydration of DNA-drug crystals significantly reduced unit cell volume, enhancing X-ray diffraction resolution. This revealed a tightly packed B-form DNA structure crosslinked by magnesium ions.

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Area of Science:

  • Structural Biology
  • Biophysics
  • Crystallography

Background:

  • DNA-drug crystals exhibit complex structures influenced by hydration.
  • Understanding DNA condensation is crucial for molecular biology and drug design.

Purpose of the Study:

  • To investigate the structural changes in dodecamer DNA-drug crystals upon controlled dehydration.
  • To determine the high-resolution structure of fully dehydrated B-form DNA.

Main Methods:

  • Controlled dehydration of DNA-drug crystals.
  • X-ray diffraction data collection and structure determination.
  • Refinement of crystal structures to high resolution.

Main Results:

  • Unit cell volume reduced from 68,000 ų to 51,000 ų upon dehydration.

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  • X-ray diffraction resolution improved from 2.6 Å to beyond 1.5 Å.
  • A highly ordered, tightly packed B-form DNA structure crosslinked by magnesium cations was elucidated.

    • Conclusions:

    • Dehydration induces significant structural changes and enhances DNA packing.
    • The fully dehydrated state reveals a polymeric network of DNA stabilized by magnesium bridges.
    • This study provides a reliable model for condensed B-form DNA.