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Related Experiment Videos

Nonplanar DNA base pairs

J Sponer1, J Florián, P Hobza

  • 1J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic. sponer@indy.jh-inst.cas.cz

Journal of Biomolecular Structure & Dynamics
|April 1, 1996
PubMed
Summary

Many hydrogen-bonded nucleic acid base pairs are intrinsically nonplanar, revealing greater flexibility than previously assumed. This nonplanarity significantly impacts DNA structure and stability, challenging current computational models.

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Area of Science:

  • Biochemistry
  • Computational Chemistry
  • Structural Biology

Background:

  • Hydrogen-bonded nucleic acid base pairs are fundamental to DNA structure and function.
  • Previous models often assumed planar base pair configurations.

Purpose of the Study:

  • To investigate the three-dimensional structures of hydrogen-bonded nucleic acid base pairs.
  • To determine the intrinsic planarity or nonplanarity of these pairs using quantum mechanical methods.

Main Methods:

  • Utilized reliable ab initio quantum mechanical methods.
  • Studied a set of over 30 hydrogen-bonded nucleic acid base pairs.

Main Results:

  • Demonstrated that many nucleic acid base pairs are intrinsically nonplanar.

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  • Identified partial sp3 hybridization of nitrogen atoms and electrostatic interactions as key factors.
  • Showcased that G-A mismatch base pairs exhibit propeller twists with energy preferences up to 1.8 kcal/mol.
  • Predicted significant stabilization ( 3 kcal/mol) for specific guanine-amino group nonplanar configurations in DNA.

    • Conclusions:

    • Nucleic acid base pair flexibility is greater than previously assumed.
    • Nonplanar interactions offer new possibilities for intermolecular interactions in DNA.
    • Current empirical potentials may not accurately capture these nonplanar effects.