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• W2104434319 endingPage "1871" @default.
• W2104434319 startingPage "1858" @default.
• W2104434319 abstract "We present a computational model of the interaction between hydrophobic cations, such as the antimicrobial peptide, Magainin2, and membranes that include anionic lipids. The peptide’s amino acids were represented as two interaction sites: one corresponds to the backbone α-carbon and the other to the side chain. The membrane was represented as a hydrophobic profile, and its anionic nature was represented by a surface of smeared charges. Thus, the Coulombic interactions between the peptide and the membrane were calculated using the Gouy-Chapman theory that describes the electrostatic potential in the aqueous phase near the membrane. Peptide conformations and locations near the membrane, and changes in the membrane width, were sampled at random, using the Metropolis criterion, taking into account the underlying energetics. Simulations of the interactions of heptalysine and the hydrophobic-cationic peptide, Magainin2, with acidic membranes were used to calibrate the model. The calibrated model reproduced structural data and the membrane-association free energies that were measured also for other basic and hydrophobic-cationic peptides. Interestingly, amphipathic peptides, such as Magainin2, were found to adopt two main membrane-associated states. In the first, the peptide resided mostly outside the polar headgroups region. In the second, which was energetically more favorable, the peptide assumed an amphipathic-helix conformation, where its hydrophobic face was immersed in the hydrocarbon region of the membrane and the charged residues were in contact with the surface of smeared charges. This dual behavior provides a molecular interpretation of the available experimental data." @default.
• W2104434319 created "2016-06-24" @default.
• W2104434319 creator A5024388057 @default.
• W2104434319 creator A5037671858 @default.
• W2104434319 creator A5038256975 @default.
• W2104434319 date "2007-09-01" @default.
• W2104434319 modified "2023-10-17" @default.
• W2104434319 title "Interactions of Cationic-Hydrophobic Peptides with Lipid Bilayers: A Monte Carlo Simulation Method" @default.
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• W2104434319 doi "https://doi.org/10.1529/biophysj.106.103812" @default.
• W2104434319 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1959530" @default.
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• W2104434319 hasPublicationYear "2007" @default.
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