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• W2031143043 abstract "Protegrin-1 (PG-1), a β-sheet antimicrobial peptide, was studied in aligned lipid bilayers by oriented circular dichroism (OCD). All of its spectra measured in a variety of lipid compositions were linear superpositions of two primary basis spectra, indicating that PG-1 existed in two different states in membranes. We designated these as state S and state I. The state assumed by PG-1 was strongly influenced by lipid composition, peptide concentration, and hydration condition. We have previously reported that the helical peptides, alamethicin and magainin, also exhibit two distinct OCD basis spectraone corresponding to surface adsorption with the helix parallel to the bilayer and the other with perpendicular transbilayer insertion. States S and I of PG-1 may correspond to the surface state and the insertion state of alamethicin, since they show a similar dependence on lipid composition, peptide concentration, and hydration condition. Nonoriented CD spectra obtained from vesicle, micelle, and solution preparations are not linear superpositions of the basis spectra of the states S and I. This indicates that a molecular orientation change alone is insufficient to describe the S ↔ I transition. Rather, a more complicated process is taking place, perhaps involving a change in the hydrogen bonding pattern of the backbone. Although the structural basis of the OCD spectra remains to be determined, the discovery of two distinct states can provide information about dynamic changes of PG-1 in membranelike environments, properties undoubtedly related to its antimicrobial and cytotoxic effects." @default.
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• W2031143043 date "1998-11-18" @default.
• W2031143043 modified "2023-10-17" @default.
• W2031143043 title "Multiple States of β-Sheet Peptide Protegrin in Lipid Bilayers" @default.
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• W2031143043 doi "https://doi.org/10.1021/bi981314q" @default.
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