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Primary and Secondary Hydration Forces between Interdigitated Membranes Composed of Bolaform Microbial Glucolipids.
Langmuir ( IF 3.7 ) Pub Date : 2020-02-25 , DOI: 10.1021/acs.langmuir.0c00279
Niki Baccile 1 , Viviana Cristiglio 2
Affiliation  

To better understand lipid membranes in living organisms, the study of intermolecular forces using the osmotic pressure technique applied to model lipid membranes has constituted the ground knowledge in the field of biophysics since four decades. However, the study of intermolecular forces in lipid systems other than phospholipids, like glycolipids, has gained a certain interest only recently. Even in this case, the work generally focuses on the study of membrane glycolipids, but little is known on new forms of non-membrane functional compounds, like microbial bolaform glycolipids. This work explores, through the osmotic stress method involving an adiabatic humidity chamber coupled to neutron diffraction, the short-range (<2 nm) intermolecular forces of membranes entirely composed of interdigitated glucolipids. Experiments are performed at pH 6 when the glucolipid is partially negatively charged and for which we explore the effect of low (16 mM) and high (100 mM) ionic strength. We find that this system is characterized by primary and secondary hydration regimes insensitive and sensitive to ionic strength, respectively, and with typical decay lengths of λH1 = 0.37 ± 0.12 nm and λH2 = 1.97 ± 0.78 nm.

中文翻译:

Bolaform微生物糖脂组成的叉指膜之间的主要和次要水合作用力。

为了更好地理解生物体中的脂质膜,使用渗透压技术对脂质膜进行建模的分子间力研究自四十年以来已构成生物物理学领域的基础知识。但是,直到最近,脂类以外的脂质系统中的分子间力的研究才引起人们的兴趣。即使在这种情况下,研究工作通常也集中在膜糖脂的研究上,但对于新型形式的非膜功能化合物(如微生物瓶状糖脂)知之甚少。这项工作通过涉及绝热湿度箱和中子衍射的渗透应力方法,探索了完全由指状糖脂组成的膜的短程(<2 nm)分子间力。当糖脂部分带负电荷时,在pH 6进行实验,为此我们探索了低(16 mM)和高(100 mM)离子强度的影响。我们发现,该系统的特征在于分别对离子强度不敏感和敏感的一级和二级水合作用,并且典型的衰变长度为λH1= 0.37±0.12 nm和λH2= 1.97±0.78 nm。
更新日期:2020-02-26
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