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Limits of NMR structure determination using variable target function calculations: ribonuclease T1, a case study

S Pfeiffer1, Y Karimi-Nejad, H Rüterjans

  • 1Institut für Biophysikalische Chemie, Johann Wolfgang Goethe-Universität, Biozentrum, Frankfurt, Germany.

Journal of Molecular Biology
|February 21, 1997
PubMed
Summary

This study explores the limits of nuclear magnetic resonance (NMR) spectroscopy for protein structure determination. Researchers refined distance restraints using relaxation matrix analysis, revealing differences between solution and crystal structures of ribonuclease T1.

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Biophysics

Background:

  • Nuclear Magnetic Resonance (NMR) spectroscopy is a powerful technique for determining protein structures in solution.
  • Ribonuclease T1 (RNase T1) is a well-characterized model protein frequently used in structural studies.

Purpose of the Study:

  • To explore the limits of NMR structure determination using multidimensional NMR spectroscopy, variable target function calculations, and relaxation matrix analysis.
  • To refine distance restraints and side-chain conformations for RNase T1.
  • To compare the solution structure of RNase T1 with its crystal structure.

Main Methods:

  • Multidimensional NMR spectroscopy was employed to collect Nuclear Overhauser Effect (NOE) intensities and 3J coupling constants.
  • Relaxation matrix analysis, incorporating amide proton exchange rates, was used to refine distance restraints.

Related Experiment Videos

  • Side-chain conformations were modeled using motional averaging of 3J coupling constants.
  • Structure ensembles were evaluated using order parameters from 15N relaxation time measurements.

    • Main Results:

    • A comprehensive dataset of 1856 NOE intensities, 493 3J coupling constants, and 62 amide proton exchange rates was obtained.
    • 2580 distance bounds, 168 torsional angle ranges, and stereospecific assignments were derived.
    • Refined distance restraints improved lower distance limits.
    • Significant differences were observed between the solution structure and crystal structure of RNase T1.

    Conclusions:

    • NMR spectroscopy, when combined with advanced analysis methods, provides detailed insights into protein structure.
    • The study highlights the importance of considering solution dynamics and comparing with crystal structures for a complete understanding of protein conformation.
    • The findings contribute to the understanding of RNase T1 structure-function relationships.