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Is the Distribution of alpha-Tocopherol in Membranes Consistent with Its Putative Functions?

机译:是与其推定功能一致的膜中α-生育酚的分布?

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摘要

Vitamin E acts as an antioxidant and stabilizer of membranes. Other functions of vitamin E unrelated to its effects on membranes are emerging. Vitamin E partitions into the lipid bilayer matrix of membranes. It orients perpendicularly to the plane of the membrane with the hydroxyl group pointing to the lipid-water interface. The vitamin is not randomly distributed in the plane of the membrane but tends to form clusters. These clusters appear to be composed of vitamin E and phosphatidylcholine in a stoichiometry of about one vitamin E per 10 phospholipid molecules. Vitamin E partitions into domains of phosphatidylcholine in model membranes formed from mixtures of phosphatidylcholine and phosphatidylethanolamine irrespective of whether the phosphatidylcholine is in the fluid or gel phase. The creation of domains enriched in vitamin E in membranes is not consistent with an antioxidant function and effects on membrane structure and stability indicate other roles of the vitamin.
机译:维生素E用作膜的抗氧化剂和稳定剂。 维生素E与其对膜的影响无关的其他功能是出现的。 维生素E分区进入膜的脂质双层基质的膜。 它与羟基指向脂质 - 水界面的羟基垂直于膜的平面。 维生素未在膜的平面中随机分布,但倾向于形成簇。 这些簇似乎由维生素E和磷脂酰胆碱组成,在约10个磷脂分子的约一种维生素E的化学计量中。 维生素E分配到由磷脂酰胆碱和磷脂酰乙醇胺的混合物形成的模型膜中的磷脂酰胆碱的结构域,而不管磷脂酰胆碱是否处于流体或凝胶相中。 在膜中富含维生素E的结构的结构与抗氧化功能和对膜结构的影响以及稳定性的作用表明维生素的其他作用。

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