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Modeling furanose ring dynamics in DNA.

G A Meints1, T Karlsson, G P Drobny

  • 1Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, USA.

Journal of the American Chemical Society
|October 11, 2001
PubMed
Summary
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Understanding DNA structure requires analyzing furanose ring flexibility. This study models furanose ring motion using deuterium NMR data, revealing key parameters for DNA conformational dynamics.

Area of Science:

  • Structural Biology
  • Biophysics
  • Nuclear Magnetic Resonance Spectroscopy

Background:

  • The conformational flexibility of the furanose ring is crucial for understanding DNA structure and function.
  • Deuterium NMR line shape analysis provides insights into molecular motion in solid-state DNA.

Purpose of the Study:

  • To apply a furanose ring motion model to analyze deuterium line shape data from solid hydrated DNA.
  • To determine key parameters governing furanose ring flexibility, including pseudorotation puckering amplitude and diffusion coefficients.

Main Methods:

  • Utilized a Brownian diffusion model for furanose ring motion, treating it as diffusion through an angular-dependent potential.
  • Simulated deuterium NMR line shapes by varying parameters such as diffusion coefficient (D), pseudorotation puckering amplitude (q), and potential energy landscape (U(phi)).

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  • Applied various potential forms, including double-well potentials, to model the ring's conformational landscape.

    • Main Results:

    • Achieved best simulations for solid-state deuterium NMR line shapes of [2''-2H]-2'-deoxycytidine within a DNA sequence using a double-well potential.
    • Identified optimal parameters: barrier height U(0) = 5.5k(B)T, puckering amplitude q = 0.4 Å, and diffusion coefficient D = 9.9 x 10^8 Hz.
    • Calculated the flux rate over the barrier (puckering rate) to be 0.7 x 10^7 Hz.

    Conclusions:

    • The developed model accurately simulates deuterium NMR line shapes, providing quantitative insights into furanose ring dynamics in DNA.
    • The findings offer a deeper understanding of the conformational flexibility essential for DNA structure and recognition.
    • This approach can be extended to study other nucleic acid systems and their dynamic properties.