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• W2074168475 abstract "Monolayers, fluorescence polarization, differential scanning calorimetry and X-ray diffraction experiments have been carried out to examine the effect of the polypeptide antibiotic polymyxin B on the phase behaviour of dipalmitoylphosphatidylglycerol (DPPG) either pure or mixed with dimyristoylphosphatidylcholine (DMPC) and dipalmitoylphosphatidylcholine (DPPC). It is shown that in both phosphatidylglycerol alone and phosphatidylglycerol/phosphatidylcholine mixtures, polymyxin B can induce either phase separation between lipid domains of various compositions or interdigitation of the acyl chains in the solid state, without segregation of the two lipids. Phase separation was observed by fluorescence and differential scanning calorimetry after addition of the antibiotic to vesicles composed of mixtures of DMPC and DPPG in conditions where polymyxin B did not saturate phosphatidylglycerol (DPPG to polymyxin B molar ratio, Ri, higher than 15). Phase separation was also observed in mixed monolayers of DPPC and of the 5:1 DPPG/polymyxin B complex, at high surface pressure. Acyl chain interdigitation was observed by X-ray diffraction in both 5:1 DPPG/polymyxin B mixtures and preformed 5:5:1 DMPC/DPPG/polymyxin B mixture, in which the antibiotic saturates phosphatidylglycerol (Ri). In both cases, raising the temperature gave rise to a complex double-peaked phase transition by differential scanning calorimetry, from the interdigitating phase to a normal Lα lamellar phase. As it is known that polymyxin B does not interact with phosphatidylcholine, the data presented show that, when phosphatidylcholine and phosphatidylglycerol are mixed together, a phase perturbation such as acyl chain interdigitation, which normally affects only phosphatidylglycerol, is also felt by phosphatidylcholine." @default.
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• W2074168475 date "1983-08-01" @default.
• W2074168475 modified "2023-10-14" @default.
• W2074168475 title "Polymyxin B-induced phase separation and acyl chain interdigitation in phosphatidylcholine/phosphatidylglycerol mixtures" @default.
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• W2074168475 doi "https://doi.org/10.1016/0005-2736(83)90226-2" @default.
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