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The effect of hydronium ions on the structure of phospholipid membranes

机译:纳温离子对磷脂膜结构的影响

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This work seeks to identify the mechanisms by which hydronium ions (H3O+) modulate the structure of phospholipid bilayers by studying the interactions of H3O+ with phospholipids at the molecular level. For this, we carried out multiple microsecond-long unrestrained molecular dynamics (MD) simulations of a POPC bilayer at different H3O+ concentrations. The results show that H3O+ accumulates at the membrane surface where it displaces water and forms strong and long-lived hydrogen bonds with the phosphate and carbonyl oxygens in phospholipids. This results in a concentration-dependent reduction of the area per lipid and an increase in bilayer thickness. This study provides an important molecular-level insight into the mechanism of how H3O+ modulates the structure of biological membranes and is a critical step towards a better understanding of the effect of low pH on mammalian and bacterial membranes.
机译:这种作品寻求通过研究H3O +与分子水平的磷脂的相互作用来确定散氢离子(H3O +)调节磷脂双层结构的机制。 为此,我们在不同的H3O +浓度下对POPC双层的多重微秒无限制的分子动力学(MD)模拟进行了多种微秒的无限制分子动力学(MD)模拟。 结果表明,H3O +在膜表面累积,在膜表面上倒置水并形成具有磷脂和磷脂中的磷酸盐和羰基氧的强度和长寿命的氢键。 这导致每脂质的面积浓度依赖性减少,并且双层厚度的增加。 本研究提供了对H3O +如何调节生物膜结构的机制的重要分子水平洞察,这是朝着更好地理解低pH对哺乳动物和细菌膜的影响的关键步骤。

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