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PMID: 9090128 Published · ppublish English Comparative Study Journal Article Research Support, U.S. Gov't, P.H.S.

Two-dimensional 1H NMR experiments show that the 23-residue magainin antibiotic peptide is an alpha-helix in dodecylphosphocholine micelles, sodium dodecylsulfate micelles, and trifluoroethanol/water solution.

Journal of biomolecular NMR ·Vol. 9 ·No. 2 ·1997-02-00 ·Pages 127-35

Gesell J, Zasloff M, Opella SJ

Abstract

Magainin2 is a 23-residue antibiotic peptide that disrupts the ionic gradient across certain cell membranes. Two-dimensional 1H NMR spectroscopy was used to investigate the structure of the peptide in three of the membrane environments most commonly employed in biophysical studies. Sequence-specific resonance assignments were determined for the peptide in perdeuterated dodecylphosphocholine (DPC) and sodium dodecylsulfate micelles and confirmed for the peptide in 2,2,2-trifluoroethanol solution. The secondary structure is shown to be helical in all of the solvent systems. The NMR data were used as a set of restraints for a simulated annealing protocol that generated a family of three-dimensional structures of the peptide in DPC micelles, which superimposed best between residues 4 and 20. For these residues, the mean pairwise rms difference for the backbone atoms is 0.47 +/- 0.10 A from the average structure. The calculated peptide structures appear to be curved, with the bend centered at residues Phe12 and Gly13.

MeSH Terms
Amino Acid Sequence Anti-Infective Agents/chemistry Antimicrobial Cationic Peptides Deuterium Hydrogen Magainins Magnetic Resonance Spectroscopy/methods Micelles Models, Molecular Molecular Sequence Data Peptides/chemical synthesis,chemistry Phosphorylcholine/analogs & derivatives Protein Structure, Secondary Sodium Dodecyl Sulfate Solutions Trifluoroethanol Water Xenopus Proteins
Chemicals
Anti-Infective Agents Antimicrobial Cationic Peptides Magainins Micelles Peptides Solutions Xenopus Proteins Water Phosphorylcholine magainin 2 peptide, Xenopus Sodium Dodecyl Sulfate dodecylphosphocholine Trifluoroethanol Hydrogen Deuterium
Authors & Affiliations
3 authors, click to expand affiliations / ORCID
Gesell J
Department of Chemistry, University of Pennsylvania, PA 19104, USA.
Zasloff M
Opella S J
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Article Info
Journal
Journal of biomolecular NMR
Abbr.
J Biomol NMR
ISSN
0925-2738
DOI
10.1023/a:1018698002314
Published
1997-02-00
Pages
127-35
Language
English
Region
Netherlands
NLM ID
9110829
Subset
IM
Grants
NIAID NIH HHS · R01AI20770 · United States
NIGMS NIH HHS · R01GM29754 · United States
NIGMS NIH HHS · T32GM07229 · United States
External Links
PubMed source DOI: 10.1023/a:1018698002314 View journal details
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