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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Influence of Monovalent Cation Size on Nanodomain Formation in Anionic-Zwitterionic Mixed Bilayers
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Influence of Monovalent Cation Size on Nanodomain Formation in Anionic-Zwitterionic Mixed Bilayers

机译:单价阳离子大小对阴离子 - 两性离子混合双层纳米域形成的影响

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摘要

Phosphatidylserine (PS) and phosphatidylcholine (PC) are two of the major anionic and zwitterionic phospholipids in mammalian cell membranes. IonPS interaction is hypothesized to play a crucial role in a range of biological events including membrane fusion, lipid phase modulation, membrane protein insertion and translocation. In this study, we characterize lipid nanodomain formation in PC/PS mixed bilayers using coarse-grained simulations. We investigate the role of monovalent cation sizes in modulating lipid-ion binding modes and lipid demixing. Our simulations suggest that certain lipid-ion binding modes lead to growth of ion-mediated PS lipid clusters. The existing literature reveals the polymorphism in binding and partitioning patterns in monovalent cations (Na+, K+, and Li+) with anionic lipids. Our work provides a microscopic view on the ion-size-dependent PS lipid packing pattern observed experimentally. A coupled relationship between lipid curvature and asymmetry is observed in highly demixed PC/PS mixed bilayers.
机译:磷脂酰丝氨酸(PS)和磷脂酰胆碱(PC)是哺乳动物细胞膜中的两个主要阴离子和两性离子磷脂。将IONPS相互作用假设在包括膜融合,脂质相调制,膜蛋白插入和易位的一系列生物事件中起重要作用。在该研究中,我们使用粗粒模拟表征PC / PS混合双层的脂质纳米域形成。我们调查单价阳离子尺寸在调节脂质离子结合模式和脂质分布中的作用。我们的模拟表明某些脂质离子结合模式导致离子介导的PS脂质簇的生长。现有文献揭示了具有阴离子脂质的一价阳离子(Na +,K +,Li +)中的结合和分配模式的多态性。我们的作品在实验观察到的离子尺寸依赖性PS脂质包装模式上提供了一种微观视图。在高度脱模的PC / PS混合双层中观察到脂曲率和不对称性之间的耦合关系。

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