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Partitioning of 1-pyrenesulfonate into zwitterionic and mixed zwitterionic/anionic fluid phospholipid bilayers

机译:1-吡咯烷磺酸酯分配至两性离子和混合的两性离子/阴离子液体磷脂双层

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摘要

Molecular partitioning into biomembranes is of fundamental importance in diverse biochemical processes and reactions. The majority of aqueous/membrane partition data using model membrane systems, is obtained with pure phosphatidylcholine bilayers, being lipid mixtures less used, while studies involving bilayers containing zwitterionic/anionic mixtures of phospholipids are even more scarce. In this study, the solvatochromic effects of 1-pyrenesulfonate observed at 375 nm in aqueous liposome suspensions, and monitored by second derivative absorption spectro photometry, enabled the determination of its partition constants into defined phospholipid bilayers. We compare, under cautiously settled experimental conditions, the partition of the anionic amphiphile PSA into fluid zwitterionic bilayers of POPC (K-p = 6.7 x 10(3), at 25 degrees C), and into fluid mixed zwitterionic/anionic bilayers containing small proportions of anionic phospholipids. At the same temperature, we found increasing K-p values in parallel with the proportion of POPS mixed with POPC (K-p = 3.4 x 10(4) and K-p = 7.3 x 10(4),With 5 and 10 mol% of POPS, respectively). Our interpretation is based on the interfacial properties of fluid and flexible mixed zwitterionic/anionic phospholipid bilayers. (C) 2008 Elsevier Ireland Ltd. All rights reserved.
机译:在各种生物化学过程和反应中,将分子划分为生物膜至关重要。使用模型膜系统的大多数水/膜分配数据是通过纯磷脂酰胆碱双层获得的,因为脂质混合物使用较少,而涉及包含两性离子/阴离子磷脂混合物的双层的研究则更为稀少。在这项研究中,在含水脂质体悬浮液中在375 nm处观察到的1-pyrenesulfonate的溶剂化变色作用,并通过二阶导数吸收分光光度法进行监测,从而能够确定其在确定的磷脂双层中的分配常数。在比较谨慎的实验条件下,我们比较了阴离子两亲性PSA在POPC的液体两性离子双层中的分配(Kp = 6.7 x 10(3),在25摄氏度下),以及在液体中的两性离子/阴离子双层中所占的比例很小。阴离子磷脂。在相同温度下,我们发现Kp值与POPS与POPC混合的比例平行增加(Kp = 3.4 x 10(4)和Kp = 7.3 x 10(4),分别具有5和10 mol%的POPS) 。我们的解释是基于流体和柔性两性离子/阴离子磷脂双层的界面性质。 (C)2008 Elsevier Ireland Ltd.保留所有权利。

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