Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
Volume 1712, Issue 1, Pages 101-108Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbamem.2005.03.003
Keywords
magainin; lipid membrane; polypeptide-lipid interactions; P-31 solid-state NMR; phase transition; phosphatidylcholine; phase diagram; detergent; peptidergent
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P-31 solid-state NMR spectroscopy has been used to investigate the macroscopic phase behavior of phospholipid bilayers ill the presence of increasing amounts of magainin antibiotic peptides. Addition of > 1 mol% magainin 2 to gel-phase DMPC or liquid crystalline POPC membranes respectively, results in P-31 NMR spectra that are characterized by the coexistence of isotropic signals and line shapes typical for phospholipid bilayers. The isotropic signal intensity is a function of temperature and peptide concentration. At peptide concentrations > 4 mol% of the resulting phospholipid P-31 NMR spectra are characteristic of magnetically oriented POPC bilayers suggesting the formation of small disk-like micelles or perforated sheets. In contrast, addition of magainin to acidic phospholipids results in homogenous bilayer-type P-31 NMR spectra with reduced chemical shift anisotropies. The results presented are in good agreement with the interfacial insertion of magainin helices with an alignment parallel to the surface of the phospholipid bilayers. The resulting curvature strain results in detergent-like properties of the amphipathic helical peptides. (c) 2005 Elsevier B.V. All rights reserved.
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