The influence of solid scaffolds on flat and curved lipid membranes

Abstract

Solid-supported membranes have become a common tool to study lipid membrane properties in a controlled environment. One particular example is the study of membrane curvature and its effect on lipid sorting. Here we simulate solid-supported membranes using the coarse grain molecular dynamics Martini force field. We characterize basic properties of the solid surfaces and lipid membranes deposited on them. Subsequently we construct large, solid ridges and use them to induce curvature in DOPC membranes. We study membrane properties, such as lateral diffusion and tail order parameters, relative to the curved membrane. Finally, we study the effect of the induced curvature on lateral lipid sorting in a ternary lipid membrane. Thus, we obtain comprehensive and microscopic insight into the impact of curvature on a lipid membrane in terms of structure and dynamics.