首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Membrane-Ion Interactions Modify the Lipid Flip-Flop Dynamics of Biological Membranes: A Molecular Dynamics Study
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Membrane-Ion Interactions Modify the Lipid Flip-Flop Dynamics of Biological Membranes: A Molecular Dynamics Study

机译:膜离子相互作用改性生物膜的脂质触发器动态:分子动力学研究

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摘要

The asymmetric distribution of lipids in the cell membrane is maintained by protein transporters, and in the absence of proteins, by spontaneous flip-flop of lipids that involve the formation of transient pores in the membrane. The composition of the cell membranes influences the metabolism of the cell by modulating the function of transmembrane proteins, and flip-flop processes are therefore of key importance. Membranes are in direct contact with aqueous solutions, containing ions of different compositions that interact with the lipid head groups or cross the cell membrane through transmembrane channels. The impact of the ions on the lipid flip-flop rates is, however, an outstanding question. Here, we show that the flip-flop rate slows down significantly with the increasing valence of the cation, from minutes for monovalent cations (Na+, K+) to hours for divalent (Mg2+, Ca2+) or days for trivalent cations (Yb3+).
机译:细胞膜中脂质的不对称分布由蛋白质转运蛋白维持,并且在没有蛋白质的情况下,通过自发的脂溢性的脂质的脂质,其涉及在膜中形成瞬态孔隙。 通过调节跨膜蛋白的功能,细胞膜的组成影响细胞的代谢,因此触发器过程因此重要性。 膜与水溶液直接接触,含有不同组合物的离子,其与脂质头组相互作用,或者通过跨膜通道通过细胞膜。 然而,离子对脂触发器率的影响是一个突出的问题。 在这里,我们表明,随着阳离子的增加,从阳离子的增加,从数分钟(Na +,K +)到三价阳离子(YB3 +)的天数(YB3 +),从阳离子的较高率(Na +,k +)或天数来自单价阳离子(Na +,K +)或数天的数小时,触发器速率显着减慢。

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