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• W1971290576 abstract "The following results are reported in this paper: The interaction of gramicidin with [11,11-2H2]dioleoylphosphatidylcholine (DOPC) and [11,11-2H2]dioleoylphosphatidylethanolamine (DOPE) at different stages of hydration was studied by 2H- and 31P-nuclear magnetic resonance. In the L alpha phase in excess water the acyl chains of phosphatidylethanolamine (PE) are more ordered than phosphatidylcholine (PC) most likely as the result of the lower headgroup hydration of the former lipid. In excess water gramicidin incorporation above 5 mol % in DOPC causes a bilayer----hexagonal HII phase change. In the HII phase acyl chain order is virtually unaffected by gramicidin but the peptide restricts the fast chain motions. At low water content gramicidin cannot induce the HII phase but it markedly decreases chain order in the DOPC bilayer. Increasing water content results in separation between a gramicidin-poor and a gramicidin-rich L alpha phase with decreased order of the entire lipid molecule. Further increase in hydration reverts at low gramicidin contents the phase separation and at high gramicidin contents results in a direct change of the disordered lamellar to the hexagonal HII phase. Gramicidin also promotes HII phase formation in the PE system but interacts much less strongly with PE than with PC. The results support our hypothesis that gramicidin, by a combination of strong intermolecular attraction forces and its pronounced cone shape, both involving the four tryptophans at the COOH-terminus, has a strong tendency to organize, with the appropriate lipid, in intramembranous cylindrical structures such as is found in the HII phase." @default.
• W1971290576 created "2016-06-24" @default.
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• W1971290576 date "1987-03-01" @default.
• W1971290576 modified "2023-09-25" @default.
• W1971290576 title "2H-nuclear magnetic resonance investigations on phospholipid acyl chain order and dynamics in the gramicidin-induced hexagonal HII phase" @default.
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• W1971290576 doi "https://doi.org/10.1016/s0006-3495(87)83361-1" @default.
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