脂质结构域共存膜的弯曲刚度和结构域间力
Bending rigidities and interdomain forces in membranes with coexisting lipid domains
摘要：
为了精确地定量与共存的液体有序（Lo）和液体无序（Ld）域的异质脂质膜之间的基本相互作用，我们进行了详细的渗透应力SAXS实验，通过利用在筏模仿脂质多层膜的域对齐。执行蒙特卡罗（MC）为基础的分析，使我们能够确定与高可靠性的幅度和功能的依赖域间的力，同时弯曲弹性模量。与以前的方法相比，这种方法使我们能够在基本水平上考虑熵波动排斥，而不必求助于粗略合理的平均场等可加性假设。我们详细的Hamaker系数计算表明，在范德华吸引力共存的Lo和Ld阶段只有很小的差异。与此相反，排斥水化和波动的相互作用显着不同，后者占主导地位的整体排斥在Ld阶段。因此，在多层膜中，类似结构域的排列似乎起源于水合作用和波动排斥。
英文摘要：
In order to precisely quantify the fundamental interactions between heterogeneous lipid membranes with coexisting liquid-ordered (Lo) and liquid-disordered (Ld) domains, we performed detailed osmotic stress SAXS experiments by exploiting the domain alignment in raft-mimicking lipid multibilayers. Performing a Monte Carlo (MC) based analysis allowed us to determine with high reliability the magnitude and functional dependence of interdomain forces concurrently with the bending elasticity moduli. In contrast to previous methodologies, this approach enabled us to consider the entropic undulation repulsions on a fundamental level, without having to take recourse to crudely justified mean-field like additivity assumptions. Our detailed Hamaker coefficient calculations indicated only small differences in the van der Waals attractions of coexisting Lo and Ld phases. In contrast, the repulsive hydration and undulation interactions differed significantly, with the latter dominating the overall repulsions in the Ld phase. Therefore, alignment of like domains in multibilayers appears to originate from both, hydration and undulation repulsions.
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