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Related Experiment Videos

Optimizing oriented planar-supported lipid samples for solid-state protein NMR.

Jan K Rainey1, Brian D Sykes

  • 1Protein Engineering Network of Centres of Excellence, University of Alberta, Edmonton, Alberta, Canada.

Biophysical Journal
|August 9, 2005
PubMed
Summary
This summary is machine-generated.

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Mica substrates enable study of oriented lipid phases using solid-state NMR. Solvent choice impacts lipid orientation, with POPC showing consistent results, while mixtures improve POPG orientation.

Area of Science:

  • Biophysics
  • Materials Science

Background:

  • Studying membrane proteins requires oriented lipid bilayers.
  • Mica substrates offer consistent surface properties for sample preparation.
  • Nuclear Magnetic Resonance (NMR) spectroscopy is a key tool for lipid analysis.

Purpose of the Study:

  • To investigate the use of mica substrates for preparing oriented phospholipid bilayers and hexagonal phases.
  • To evaluate the effect of different solvents on lipid film formation and orientation.
  • To characterize the degree of orientation of various hydrated lipid species using solid-state NMR.

Main Methods:

  • Preparation of oriented lipid samples on mica substrates.
  • Casting lipid films or spreading vesicles using nine different solvents.

Related Experiment Videos

  • Characterization of lipid orientation using static solid-state 31P-NMR spectroscopy.

    • Main Results:

    • Spectral characteristics of lipids on mica were comparable or superior to glass.
    • Solvent choice influenced the orientation of POPG, DOPA, and DOPE, but not POPC.
    • POPC demonstrated optimal orientation, while POPG required mixtures for reproducible orientation.
    • DOPA exhibited 1-2 oriented states, and DOPE formed a temperature-reversible hexagonal to bilayer phase transition.

    Conclusions:

    • Mica is a suitable substrate for oriented lipid NMR studies.
    • Solvent selection is critical for achieving homogeneous oriented lipid samples.
    • Different lipid headgroup chemistries exhibit varied responses to solvent and hydration conditions.