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Related Experiment Videos

Separated local field NMR experiments on oriented samples rotating at the magic angle.

Jakob J Lopez1, A J Mason, Christoph Kaiser

  • 1Institute for Biophysical Chemistry and Center for Biomolecular Magnetic Resonance, J.W. Goethe University, 60438, Frankfurt am Main, Germany.

Journal of Biomolecular NMR
|December 21, 2006
PubMed
Summary
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Solid-state NMR (SSNMR) now enables biophysical studies of membrane proteins within their native environment. A novel Magic Angle Oriented Sample Spinning (MAOSS) technique combined with separated local field (SLF) experiments precisely determines molecular orientation.

Area of Science:

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

Background:

  • Solid-state NMR (SSNMR) is crucial for studying membrane proteins in their native lipid bilayer environments.
  • Traditional SSNMR methods involve multi-lamellar dispersions or aligned multi-layers, with or without sample rotation.
  • A new technique, Magic Angle Oriented Sample Spinning (MAOSS), combines MAS NMR with aligned samples.

Purpose of the Study:

  • To introduce and validate the MAOSS technique for biophysical studies of membrane proteins.
  • To demonstrate the ability of MAOSS combined with separated local field (SLF) experiments to determine molecular orientation.
  • To compare MAOSS-SLF results with established SSNMR methods and X-ray diffraction.

Main Methods:

  • Application of Magic Angle Oriented Sample Spinning (MAOSS) NMR to aligned samples.

Related Experiment Videos

  • Integration of MAOSS with Separated Local Field (SLF) experiments to correlate dipolar couplings and chemical shifts.
  • Utilizing polyethylene fibers as a model system and purple membrane (bacteriorhodopsin) as a model for aligned membrane proteins.

    • Main Results:

    • Demonstrated feasibility of MAOSS-SLF experiments on ordered polyethylene fibers and aligned purple membrane multi-layers.
    • Successfully extracted size and orientation of heteronuclear dipolar couplings ((1)H-X).
    • Analyzed angular sensitivity and the impact of sample disorder on MAOSS-SLF experiments.

    Conclusions:

    • MAOSS-SLF provides a powerful new method for determining the orientation of molecular groups in aligned membrane protein samples.
    • This technique offers complementary orientation information to X-ray diffraction and established non-spinning SSNMR methods.
    • MAOSS-SLF enhances the capability of SSNMR for detailed biophysical characterization of membrane proteins.