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Related Experiment Videos

Low-temperature solid-state 15N NMR characterization of polypeptide backbone librations

N D Lazo1, W Hu, T A Cross

  • 1Department of Chemistry, Florida State University, Tallahassee 32306-3006, USA.

Journal of Magnetic Resonance. Series B
|April 1, 1995
PubMed
Summary

Gramicidin A

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Area of Science:

  • Biophysics
  • Molecular Dynamics
  • Solid-State Nuclear Magnetic Resonance (NMR) Spectroscopy

Background:

  • Gramicidin A forms channels in lipid bilayers, influencing membrane properties.
  • Understanding peptide dynamics in membranes is crucial for biological function.

Purpose of the Study:

  • To investigate the local molecular dynamics of gramicidin A in lipid bilayers.
  • To determine the orientation and amplitudes of molecular motion.

Main Methods:

  • Low-temperature solid-state 15N NMR spectroscopy.
  • Rapid sample freezing using liquid propane.
  • Analysis of chemical-shift tensor elements and their averaging.

Main Results:

  • Static tensor-element magnitudes differ between hydrated bilayers and dry powder samples.
  • The orientation of the 15N chemical-shift tensor is consistent across sample types.
  • Anisotropic averaging of the chemical-shift tensor indicates motional axis alignment.
  • Librational amplitudes at 263 K are larger than nanosecond-scale motions.

Conclusions:

  • Low-temperature NMR provides accurate tensor element magnitudes for gramicidin A dynamics.
  • Molecular motion in gramicidin A involves both correlated (nanosecond) and uncorrelated (picosecond) components.
  • Picosecond motions increase and become more isotropic near the bilayer surface.

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