Structure and dynamics of the antibiotic peptide PGLa in membranes by solution and solid-state nuclear magnetic resonance spectroscopy

Biophysical Journal
B BechingerS J Opella

Abstract

PGLa, a 21-residue member of the magainin family of antibiotic peptides, is shown to be helical between residues 6 and 21 when associated with detergent micelles by multidimensional solution nuclear magnetic resonance (NMR) spectroscopy. Solid-state NMR experiments on specifically 15N-labeled peptides in oriented phospholipid bilayer samples show that the helix axis is parallel to the plane of the bilayers. 15N solid-state NMR powder pattern line shapes obtained on unoriented samples demonstrate that the amino-terminal residues are highly mobile and that the fluctuations of backbone sites decrease from Ala6 toward the carboxy terminus. The powder pattern observed for 15N-labeled Ala20 is essentially that expected for a rigid site. These findings are similar to those for the 23-residue magainin2 peptide in membrane environments.

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Citations

May 20, 1999·Biopolymers·D Andreu, L Rivas
Oct 12, 1999·Biopolymers·B BechingerS Schinzel
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