期刊
EUROPEAN BIOPHYSICS JOURNAL WITH BIOPHYSICS LETTERS
卷 45, 期 6, 页码 535-547出版社
SPRINGER
DOI: 10.1007/s00249-016-1120-7
关键词
Synergistic antimicrobial peptides; Membrane-active amphiphilic helices; Solid-state NMR; Vesicle leakage assay; Hill coefficients; Peptide dimerization
类别
PGLa and magainin 2 (MAG2) are amphiphilic a-helical frog peptides with synergistic antimicrobial activity. In vesicle leakage assays we observed the strongest synergy for equimolar mixtures of PGLa and MAG2. This result was consistent with solid-state 15N-NMR data on the helix alignment in model membranes. The Hill coefficients determined from the vesicle leakage data showed that the heterodimeric (PGLa-MAG2) interactions were stronger than the homodimeric (PGLa-PGLa and MAG2-MAG2) interactions. This result was also reflected in the free energy of dimerization determined from oriented circular dichroism and quantitative solid-state F-19-NMR analysis.
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