Abstract

Membrane domain formation plays a key role in various cellular functions and biological events. Lateral accumulation of lipids and proteins in biological membranes is one of the most important factors that control the domain formation. However, compared to numerous reports on the lipid aggregation or accumulation formed in the membranes composed of multiple components of lipids and cholesterol, the lipid accumulation in one-component phospholipid bilayer system is still rare. In this study, we demonstrate that short peptides can induce the lipid accumulation in a single-component zwitterionic lipid bilayer. By investigating the interaction between a short peptide of mastoparan (MP, a G-protein-activating peptide) and neutral phosphocholine lipid bilayers using sum frequency generation vibrational spectroscopy (SFG-VS), we have found that MP can cause a local accumulation of lipid molecules at the outer leaflet of the lipid bilayer, resulting in more than 10 times intensity increase in the signals from the...

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