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Related Experiment Videos

A refined solution structure of hen lysozyme determined using residual dipolar coupling data.

H Schwalbe1, S B Grimshaw, A Spencer

  • 1Oxford Centre for Molecular Sciences, New Chemistry Laboratory, University of Oxford, Oxford OX1 3QT, England.

Protein Science : a Publication of the Protein Society
|March 29, 2001
PubMed
Summary

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High-resolution nuclear magnetic resonance (NMR) structures of hen lysozyme were determined using residual dipolar couplings. This method improved structural accuracy and provided insights into protein dynamics.

Area of Science:

  • Structural Biology
  • Biophysics
  • Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Determining high-resolution protein structures in solution is crucial for understanding biological function.
  • Nuclear magnetic resonance (NMR) spectroscopy is a powerful technique for structural biology.
  • Residual dipolar couplings (RDCs) provide long-range orientational information, enhancing structure determination.

Purpose of the Study:

  • To determine a high-resolution NMR structure of hen lysozyme.
  • To evaluate the contribution of RDC restraints to the accuracy of NMR structures.
  • To investigate the solution structure and dynamics of hen lysozyme.

Main Methods:

  • High-resolution NMR structure determination using a combination of NOE distance restraints, torsion angle restraints, hydrogen bond restraints, and residual 1H-15N dipolar coupling restraints.

Related Experiment Videos

  • Measurements of RDCs were performed in two different dilute liquid crystalline phases (bicelles).
  • Comparison of structures calculated with and without RDC data to assess the impact of RDCs.

    • Main Results:

    • An ensemble of 50 low-energy NMR structures of hen lysozyme was generated with good agreement to the mean structure and crystal structure.
    • Structures calculated with RDC data showed improved similarity to the crystal structure and better stereochemical quality compared to those without RDCs.
    • The NMR structures demonstrated improved quality factors when validated against independent RDC and relaxation data.

    Conclusions:

    • Residual dipolar couplings significantly enhance the accuracy and quality of NMR-derived protein structures.
    • The determined NMR structure provides a detailed description of hen lysozyme in solution.
    • Analysis of the structures offers insights into the dynamical behavior of hen lysozyme.