Permeation of small molecules in phase separated lipid bilayer domains*

Membranes of cells are constituted of lipid bilayers, which can phase separate into ordered domains called rafts. Recent atomic simulations have shown that ionic permeation is enhanced at the gel-liquid interface of rafts near the melting temperature. Herein, we revisit permeation of small molecules at raft interfaces using the coarse-grained MARTINI model. Namely, we study how the free energy of insertion changes with the small molecule, lipid composition and temperature.