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• W2016511867 abstract "Melittin is shown to affect the structure of the charged phospholipid dipalmitoylphosphatidylglycerol (DPPG). In the gel phase, the presence of melittin leads to (i) an increased lipid interchain vibrational coupling, (ii) a shift of the rectangular to hexagonal lipid packing transition toward low temperatures, (iii) a very small conformational disordering effect, (iv) a decrease of the polarity or hydrogen bonding capability of the lipid ester group surrounding, (v) an important decrease of the water content in the complexes where the remaining water has a more disordered structure than bulk water, and (vi) an interlamellar repeat distance of 79 A. All these observations are rationalized by the following model: adjacent bilayers of DPPG are bridged by tetramers of melittin through electrostatic interactions inducing surface charge neutralization and partial dehydration of the complexes. Melittin also affects the thermotropic behavior of DPPG. When a small amount of the toxin is present, its affinity for charged lipids is such that a phase separation occurs, the domains being stable enough to have their own gel to liquid-crystalline phase transition. In the fluid state, a deeper penetration into the lipid matrix is proposed based on the downshift of the phase transition and the low vibrational interchain coupling. This study brings out general features of cationic species/anionic lipid complexes. The charge neutralization leads to stronger interchain coupling, and electrostatic bridging of adjacent bilayers seems to be common. The hydrophobicity of the peptide is a key factor in the modulation of the gel to liquid-crystalline phase transition and in its insertion in the fluid lipid matrix." @default.
• W2016511867 created "2016-06-24" @default.
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• W2016511867 creator A5040038736 @default.
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• W2016511867 date "1991-10-01" @default.
• W2016511867 modified "2023-09-24" @default.
• W2016511867 title "Investigation of the interaction between melittin and dipalmitoylphosphatidylglycerol bilayers by vibrational spectroscopy" @default.
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• W2016511867 doi "https://doi.org/10.1016/0009-3084(91)90023-5" @default.
• W2016511867 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/1804567" @default.
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