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• W2044326822 abstract "Hydrophobic interactions are responsible for stabilizing leucine zippers in peptides containing heptad repeats. The effects of substituting leucine by phenylalanine and alanine by glycine on the self-assembly of coiled-coils were examined in minimalist antimicrobial peptides designed to form amphipathic alpha-helices. The secondary structure of these peptides was monitored in solution and in diphosphocholine (DPC) micelles using circular dichroism spectroscopy. The leucine peptides (KLAKLAK)3 and (KLAKKLA)n (n = 3, 4) become alpha-helical with increasing concentrations of salt, peptide, and DPC. The aggregation state and equilibrium constant for self-association of the peptides were measured by sedimentation equilibrium. The glycine peptide (KLGKKLG)3 does not self-associate. The leucine peptides and phenylalanine peptides (KFAKFAK)3 and (KFAKKFA)n (n = 3, 4) are in a monomer-tetramer equilibrium in solution, with the phenylalanine zippers being 2-4 kcal/mol less stable than the equivalent leucine zippers. Thermodynamic parameters for the association reaction were calculated from the temperature dependence of the association constants. Leucine zipper formation has DeltaCp = 0, whereas phenylalanine zipper formation has a small negative DeltaCp, presumably due to the removal of the larger surface area of phenylalanine from water. Self-association of the peptides is coupled to formation of a hydrophobic core as detected using 1-anilino-naphthalene-8-sulfonate fluorescence. Carboxyfluorescein-labeled peptides were used to determine the aggregation state of (KLAKKLA)3 and (KLGKKLG)3 in DPC micelles. (KLAKKLA)3 forms dimers, and (KLGKKLG)3 is a monomer. Aggregation appears to correlate with the cytotoxicity of these peptides." @default.
• W2044326822 created "2016-06-24" @default.
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• W2044326822 date "1997-08-01" @default.
• W2044326822 modified "2023-10-09" @default.
• W2044326822 title "Self-Assembly of Designed Antimicrobial Peptides in Solution and Micelles" @default.
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• W2044326822 doi "https://doi.org/10.1021/bi961644f" @default.
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