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Related Experiment Videos

Magic angle-oriented sample spinning (MAOSS): A new approach toward biomembrane studies

C Glaubitz1, A Watts

  • 1Biomembrane Structure Unit, University of Oxford, South Parks Road, Oxford, OX1 3QU, Great Britain.

Journal of Magnetic Resonance (San Diego, Calif. : 1997)
|May 2, 1998
PubMed
Summary

Magic angle sample spinning (MAS) NMR applied to aligned biomembranes offers improved structural insights into membrane proteins and lipids. This technique enhances spectral resolution, surpassing previous methods even at lower fields and spinning speeds.

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Area of Science:

  • Biophysical Chemistry
  • Structural Biology
  • Nuclear Magnetic Resonance Spectroscopy

Background:

  • Magic Angle Sample Spinning (MAS) NMR is crucial for studying biomolecular structures.
  • Uniformly aligned biomembranes present unique challenges and opportunities for NMR analysis.
  • Spectral linewidth in lipid dispersions is often dominated by dipolar coupling or chemical shift anisotropy.

Purpose of the Study:

  • To demonstrate a novel general approach for structural studies of membrane proteins, peptides, and lipids using MAS NMR on uniformly aligned biomembranes.
  • To leverage the orientational order in aligned membranes to improve spectral resolution and extract structural information.
  • To present the first MAS NMR spectra of aligned DMPC bilayers and M13 coat protein.

Main Methods:

Related Experiment Videos

  • Application of Magic Angle Sample Spinning (MAS) NMR to uniformly aligned biomembrane samples.
  • Utilizing the reduced spectral linewidth due to 2D order in aligned lipid membranes.
  • Employing anisotropic intermolecular motions for averaging dipolar interactions by aligning the membrane normal parallel to the rotor axis.
  • Acquiring 1H, 31P, and 13C MAS NMR spectra.

    • Main Results:

    • Achieved dramatic resolution improvement for protons in a lipid sample at 220 Hz spinning speed and 9.4 T field, outperforming ultra-high field methods.
    • Demonstrated reduction of line broadening from orientational defects ('mosaic spread') at low spinning speeds.
    • Obtained valuable orientational information through analysis of spinning sidebands.
    • Presented high-resolution 1H, 31P, and 13C MAS spectra of aligned DMPC bilayers and enhanced 1H resolution for M13 coat protein.

    Conclusions:

    • MAS NMR on uniformly aligned biomembranes is a powerful new general approach for membrane biophysics.
    • This technique combines high resolution with the advantages of orientational constraints from macroscopically oriented samples.
    • The method holds significant potential for future structural studies of membrane systems.