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• W2093647585 abstract "Deuterium wide line NMR spectroscopy was used to study cholesterol effects on the ceramide portions of two glycosphingolipids (GSLs) distributed as minor components in fluid membranes. The common existence of very long fatty acids on GSLs was taken into account by including one glycolipid species with fatty acid chain length matching that of the host matrix, and one longer by 6 carbons. N-stearoyl and N-lignoceroyl galactosyl ceramide with perdeuterated fatty acid (18:0[d35] GalCer and 24:0[d47] GalCer) were prepared by partial synthesis. They were dispersed in bilayer membranes having the 18-carbon-fatty-acid phospholipid, 1-stearoyl-2-oleoyl-phosphatidylcholine (SOPC), as major component. Glycolipid fatty acid chain behavior and arrangement were analyzed using order profiles derived from their 2H-NMR spectra. Cholesterol effects on order parameter profiles for 18:0[d35] GalCer, with chain length equal to that of the host matrix, followed the pattern known for acyl chains of phospholipids. The presence of sterol led to restriction of trans/gauche isomerization along the length of the chain, with the largest absolute increase in order parameters being toward the surface, but somewhat greater relative effect just below the plateau region. In cholesterol-containing membranes, order parameter profiles for the long chain species, 24:0[d47] GalCer, showed a characteristic secondary plateau associated with carbon atoms C14 to C23, a feature also present in SOPC bilayers without cholesterol and in pure hydrated 24:0[d47] GalCer. Cholesterol-induced ordering effects on the long chain glycolipid were similar to those described for the shorter chain species, but were minimal at the methyl terminus. Within a given membrane,SCD profiles for 1 8:O[d3] GalCer and 24:0[d47] GalCer were quantitatively similar to a membrane depth of C13 to C14. SCD values at C16 and C17 were about 15% and 28% higher, respectively, for the long chain GSL than for its short chain analogue inSOPC/cholesterol (compared to 21 and 31%, respectively, in membranes without cholesterol). Nitroxide spin labels attached rigidly to C16 of the long chain glycolipid gave EPR order parameters that were twice as high as for the same spin label at C16 on the shorter chain glycolipid in both matrices. It would appear that the above factors impose a tendency for the extra portion of the 24-carbon chain to cross the bilayer midplane where it may interact with terminal portions of acyl chains in the opposing monolayer; however, steric constraints, and probably collision events associated with lateral diffusion, induce wide orientation fluctuations in the segment involved." @default.
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• W2093647585 date "1995-01-01" @default.
• W2093647585 modified "2023-09-26" @default.
• W2093647585 title "Glycosphingolipid fatty acid arrangement in phospholipid bilayers: cholesterol effects" @default.
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• W2093647585 doi "https://doi.org/10.1016/s0006-3495(95)80173-6" @default.
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