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• W2031282605 endingPage "319" @default.
• W2031282605 startingPage "309" @default.
• W2031282605 abstract "The influences of peptide length, absence of a Glx (Gln/Glu) residue and the C-terminal amino alcohol on liposome permeabilization and ion-channel characteristics in planar lipid bilayers were examined with two 18-residue peptaibols, PA V and PA IX. As compared to the 20-residue alamethicin, both peptides belonging to the newly isolated trichorzin family, lack a proline in the N-terminal part and one of the two Gln/Glu residues in the C-terminal part of the sequence. The two analogues studied here differ among themselves in their C-terminal amino alcohol (tryptophanol for PA V and phenylalaninol for PA IX). These α-helical peptaibols modify to a similar extent the permeability of liposomes, as measured by leakage of a previously entrapped fluorescent probe. Monitoring tryptophanol fluorescence, a greater embedment of the peptide PA V is observed in cholesterol-free bilayers. Macroscopic conductance studies for PA V and PA IX display alamethicin-like current–voltage curves, with a similar voltage dependence, but a smaller mean number of monomers per conducting aggregate is estimated for the tryptophanol analogue, PA V. Single-channel recordings indicate faster current fluctuations for PA IX, while amplitude histograms show lower conductance levels for PA V. Apart from underlining the role of the mismatch between helix length and bilayer hydrophobic thickness, these results stress that the C-terminal tryptophanol favours a stabilization of the conducting aggregates." @default.
• W2031282605 created "2016-06-24" @default.
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• W2031282605 date "1998-03-01" @default.
• W2031282605 modified "2023-10-03" @default.
• W2031282605 title "Alamethicin-like behaviour of new 18-residue peptaibols, trichorzins PA. Role of the C-terminal amino-alcohol in the ion channel forming activity" @default.
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• W2031282605 doi "https://doi.org/10.1016/s0005-2736(97)00235-6" @default.
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