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• W2082499403 abstract "The mechanisms underlying antimicrobial and anti-endotoxic effects were investigated for a series of structurally related peptides derived from the C-terminal region of S1 peptidases. For this purpose, results on bacterial killing were compared to those on peptide-induced liposome leakage, and to ellipsometry and dual polarization interferometry results on peptide binding to, and disordering of, supported lipid bilayers. Furthermore, the ability of these peptides to block endotoxic effects caused by bacterial lipopolysaccharide (LPS), monitored through NO production in macrophages, was compared to the binding of these peptides to LPS, and to secondary structure formation in the peptide/LPS complex. Bacteria killing, occurring through peptide-induced membrane lysis, was found to correlate with liposome rupture, and with the extent of peptide binding to the lipid membrane, no adsorption threshold for peptide insertion being observed. Membrane and LPS binding was found to depend on peptide net charge, illustrated by LPS binding increasing with increasing peptide charge, and peptides with net negative charge being unable to lyse membranes, kill bacteria, and block LPS-induced endotoxic effect. These effects were, however, also influenced by peptide hydrophobicity. LPS binding was furthermore demonstrated to be necessary, but not sufficient, for anti-endotoxic effect of these peptides. Circular dichroism spectroscopy showed that pronounced helix formation occurs in peptide/LPS complexes for all peptides displaying anti-endotoxic effect, hence potentially linked to this functionality. Similarly, ordered secondary structure formation was correlated to membrane binding, lysis, and antimicrobial activity of these peptides. Finally, preferential binding of these peptides to LPS over the lipid membrane was demonstrated." @default.
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• W2082499403 date "2012-09-01" @default.
• W2082499403 modified "2023-10-03" @default.
• W2082499403 title "Membrane and lipopolysaccharide interactions of C-terminal peptides from S1 peptidases" @default.
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• W2082499403 doi "https://doi.org/10.1016/j.bbamem.2012.03.017" @default.
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