Department of Physics and Astronomy, Texas Tech University, Box 41051, Lubbock, Texas 79409, United States.
Department of Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, Japan.
J Phys Chem B. 2020 Jun 18;124(24):4949-4959. doi: 10.1021/acs.jpcb.0c03329. Epub 2020 Jun 4.
The energy penalty for bilayer phase domain interfaces, line tension, is an important quantity for describing the phase domain size transition from the nanometer scale to the micrometer scale and larger. We connected pairwise lipid interaction energies in ternary lipid mixtures with experimentally measured line tensions by using the compositional differences between coexisting liquid-disordered (Ld) and liquid-ordered (Lo) phases known from phase diagrams. Using a mean-field theory model, we developed a computational procedure to map out Ld + Lo phase boundaries and thermodynamic tielines based on a set of pairwise interaction energies. We find that experimentally measured Ld/Lo line tension can be effectively modeled by the sum of pairwise interactions at the interface. This result indicates that pairwise lipid interactions make a major contribution to line tension.
双层相畴界面的能量罚则（线张力）是一个重要的物理量，用于描述从纳米尺度到微米尺度甚至更大的相畴尺寸转变。我们通过使用相图中已知的共存无序相 (Ld) 和有序相 (Lo) 之间的组成差异，将三元脂质混合物中的成对脂质相互作用能量与实验测量的线张力联系起来。使用平均场理论模型，我们开发了一种计算程序，基于一组成对相互作用能量，绘制出 Ld + Lo 相界和热力学 tie 线。我们发现，实验测量的 Ld/Lo 线张力可以通过界面处的成对相互作用的总和有效地建模。这一结果表明，成对脂质相互作用对线张力有很大贡献。
