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Related Experiment Videos

Distance measurements in nucleic acids using windowless dipolar recoupling solid state NMR

M A Mehta1, D M Gregory, S Kiihne

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

Solid State Nuclear Magnetic Resonance
|December 1, 1996
PubMed
Summary

A new pulse sequence, dipolar recoupling with adiabatic windows (DRAWS), effectively recouples weak dipolar interactions. This method accurately measures carbon-13 distances in DNA, aiding structural analysis.

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Area of Science:

  • Solid-state Nuclear Magnetic Resonance (NMR) Spectroscopy
  • Structural Biology
  • Biophysics

Background:

  • Homonuclear dipolar recoupling is crucial for structural analysis in solid-state NMR.
  • Existing methods often face limitations in broad applicability and sensitivity to experimental conditions.

Purpose of the Study:

  • To introduce and validate a novel windowless, homonuclear dipolar recoupling pulse sequence named DRAWS.
  • To establish a theoretical framework for understanding DRAWS performance.
  • To demonstrate the utility of DRAWS for measuring internuclear distances in biomolecules.

Main Methods:

  • Development of the DRAWS pulse sequence.
  • Theoretical analysis using numerical techniques.
  • Spectroscopic control experiments to account for experimental artifacts.

Related Experiment Videos

  • Application to selectively 13C-labeled DNA dodecamers.

    • Main Results:

    • DRAWS effectively recouples weak dipolar interactions across diverse conditions.
    • Control experiments confirmed the reliability of the method.
    • Accurate 13C-13C distances were measured in DNA dodecamers, with values up to 4.8 Å.
    • Measured distances showed good agreement with X-ray crystallographic data.

    Conclusions:

    • DRAWS is a robust and versatile tool for homonuclear dipolar recoupling in solid-state NMR.
    • The method enables precise measurement of internuclear distances in complex biological systems.
    • Findings highlight the sensitivity of DNA structure to hydration levels.