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- W2086126521 abstract "Lipid−water interaction plays an important role in the properties of lipid bilayers, cryoprotectants, and membrane-associated peptides and proteins. The temperature at which water bound to lipid bilayers freezes is lower than that of free water. Here, we report a solid-state NMR investigation on the freezing point depression of water in phospholipid bilayers in the presence and absence of cholesterol. Deuterium NMR spectra at different temperatures ranging from −75 to +10 °C were obtained from fully 2H2O-hydrated POPC (1-palmitoyl-2-oleoylphosphatidylcholine) multilamellar vesicles (MLVs), prepared with and without cholesterol, to determine the freezing temperature of water and the effect of cholesterol on the freezing temperature of water in POPC bilayers. Our 2H NMR experiments reveal the motional behavior of unfrozen water molecules in POPC bilayers even at temperatures significantly below 0 °C and show that the presence of cholesterol further lowered the freezing temperature of water in POPC bilayers. These results suggest that in the presence of cholesterol the fluidity and dynamics of lipid bilayers can be retained even at very low temperatures as exist in the liquid crystalline phase of the lipid. Therefore, bilayer samples prepared with a cryoprotectant like cholesterol should enable the performance of multidimensional solid-state NMR experiments to investigate the structure, dynamics, and topology of membrane proteins at a very low temperature with enhanced sample stability and possibly a better sensitivity. Phosphorus-31 NMR data suggest that lipid bilayers can be aligned at low temperatures, while 15N NMR experiments demonstrate that such aligned samples can be used to enhance the signal-to-noise ratio of 15N chemical shift spectra of a 37-residue human antimicrobial peptide, LL-37." @default.
- W2086126521 created "2016-06-24" @default.
- W2086126521 creator A5006414766 @default.
- W2086126521 creator A5069980594 @default.
- W2086126521 creator A5084832904 @default.
- W2086126521 date "2008-11-08" @default.
- W2086126521 modified "2023-10-17" @default.
- W2086126521 title "Freezing Point Depression of Water in Phospholipid Membranes: A Solid-State NMR Study" @default.
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- W2086126521 doi "https://doi.org/10.1021/la8023698" @default.
- W2086126521 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2649677" @default.
- W2086126521 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/18991419" @default.
- W2086126521 hasPublicationYear "2008" @default.
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