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• W2027166526 startingPage "2361" @default.
• W2027166526 abstract "A variety of amphiphilic helical peptides have been shown to exhibit a transition from adsorbing parallel to a membrane surface at low concentrations to inserting perpendicularly into the membrane at high concentrations. Furthermore, this transition has been correlated to the peptides' cytolytic activities. X-ray lamellar diffraction of diphytanoyl phosphatidylcholine-alamethicin mixtures revealed the changes of the bilayer structure with alamethicin concentration. In particular, the bilayer thickness decreases with increasing peptide concentration in proportion to the peptide-lipid molar ratio from as low as 1:150 to 1:47; the latter is near the threshold of the critical concentration for insertion. From the decreases of the bilayer thickness, one can calculate the cross sectional expansions of the lipid chains. For all of the peptide concentrations studied, the area expansion of the chain region for each adsorbed peptide is a constant 280 +/- 20 A2, which is approximately the cross sectional area of an adsorbed alamethicin. This implies that the peptide is adsorbed at the interface of the hydrocarbon region, separating the lipid headgroups laterally. Interestingly, the chain disorder caused by a peptide adsorption tends to spread over a large area, as much as 100 A in diameter. The theoretical basis of the long range nature of bilayer deformation is discussed." @default.
• W2027166526 created "2016-06-24" @default.
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• W2027166526 date "1995-06-01" @default.
• W2027166526 modified "2023-10-16" @default.
• W2027166526 title "X-ray diffraction study of lipid bilayer membranes interacting with amphiphilic helical peptides: diphytanoyl phosphatidylcholine with alamethicin at low concentrations" @default.
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• W2027166526 doi "https://doi.org/10.1016/s0006-3495(95)80418-2" @default.
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