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. 1996 Aug;71(2):832–839. doi: 10.1016/S0006-3495(96)79284-6

Effects of lutein and cholesterol on alkyl chain bending in lipid bilayers: a pulse electron spin resonance spin labeling study.

J J Yin 1, W K Subczynski 1
PMCID: PMC1233539  PMID: 8842221

Abstract

A short pulse saturation recovery electron spin resonance technique has been used to study the effects of polar carotenoid-lutein and cholesterol on interactions of 14N:15N stearic acid spin-label pairs in fluid-phase phosphatidylcholine (PC) membranes. Bimolecular collisions for pairs consisting of various combinations of [14N]-16-, [14N]-10-, [14N]-7-, or [14N]-5-doxylstearate and [15N]-16-doxylstearate in dimyristoyl-PC (DMPC) or egg yolk PC (EYPC) membranes were measured at 27 degrees C. In the absence and presence of lutein or cholesterol for both lipid systems, the collision rates were ordered as 16:5 < 16:7 < 16:10 < 16:16. For all spin-label pairs studied, interaction frequencies were greater in DMPC than in EYPC. Polar carotenoid-lutein reduces the collision frequency for all spin-label pairs, whereas cholesterol reduces the collision frequency for 16:5 and 16:7 pairs and increases the collision frequency in the membrane center for 16:10 and 16:16 pairs. The presence of unsaturated alkyl chains greatly reduces the effect of lutein but magnifies the effect of cholesterol in the membrane center. The observed differences in the effects of these modifiers on alkyl chain bending result from differences in the structure of cholesterol and polar carotenoid and from their different localization within the lipid bilayer membrane. These studies further confirm the occurrence of vertical fluctuations of alkyl chain ends toward the bilayer surface.

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Selected References

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