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Cholesterol Partition and Condensing Effect in Phase-Separated Ternary Mixture Lipid Multilayers

机译:相分离三元混合物脂质多层中的胆固醇分配和缩合效应

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摘要

The cholesterol partitioning and condensing effect in the liquid-ordered (Lo) and liquid-disordered (Ld) phases were systematically investigated for ternary mixture lipid multilayers consisting of 1:1 1,2-dipalmitoyl-sn-glycero-3-phosphocholine/1,2-dioleoyl-sn-glycero-3-phosphocholine with varying concentrations of cholesterol. X-ray lamellar diffraction was used to deduce the electron density profiles of each phase. The cholesterol concentration in each phase was quantified by fitting of the electron density profiles with a newly invented basic lipid profile scaling method that minimizes the number of fitting parameters. The obtained cholesterol concentration in each phase versus total cholesterol concentration in the sample increases linearly for both phases. The condensing effect of cholesterol in ternary lipid mixtures was evaluated in terms of phosphate-to-phosphate distances, which together with the estimated cholesterol concentration in each phase was converted into an average area per molecule. In addition, the cholesterol position was determined to a precision of (±0.7Å) and an increase of disorder in the lipid packing in the Lo phase was observed for total cholesterol concentration of 20∼30%.
机译:对于由1:1 1,2-二棕榈酰-sn-glycero-3-phosphocholine / 1组成的三元混合脂质多层膜,系统地研究了液相(Lo)和液相(Ld)相中的胆固醇分配和浓缩作用。 ,胆固醇含量不同的,2-二油酰基-sn-甘油-3-磷酸胆碱。 X射线层状衍射用于推导每个相的电子密度分布。通过使用新发明的基本脂质分布图缩放方法拟合电子密度分布图来量化各相中的胆固醇浓度,该方法最大程度地减少了拟合参数的数量。每个阶段中获得的胆固醇浓度与样品中总胆固醇浓度的线性关系在两个阶段均呈线性增加。胆固醇在三元脂质混合物中的缩合作用是根据磷酸盐到磷酸盐的距离进行评估的,将其与每个相中估计的胆固醇浓度一起转换为每个分子的平均面积。另外,将胆固醇位置确定为(±0.7Å)的精确度,并且在总胆固醇浓度为20%至30%的情况下,观察到Lo相中脂质堆积的无序性增加。

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