Biomimetic membranes of lipid-peptide model systems prepared on solid support

Chenghao Li (1) , Doru Constantin (1) , Tim Salditt (1)

1 Institut für Röntgenphysik

The structure of membrane-active peptides and their interaction with lipid bilayers can be studied in oriented lipid membranes deposited on solid substrates. Such systems are desirable for a number of surface-sensitive techniques. Here we focus on structural characterization by X-ray and neutron reflectivity and give account of recent progress in sample preparation and measurements. We show that the degree of mesoscopic disorder in the films can significantly influence the scattering curves. Static defects should be minimized by optimization of the preparation techniques and their presence must be taken into account in the modelling. Examples are given for alamethicin and magainin in bilayers of different phosphocholines.

Domaines: Matière Molle [cond-mat.soft]

Chenghao Li, Doru Constantin, Tim Salditt. Biomimetic membranes of lipid-peptide model systems prepared on solid support. Journal of Physics: Condensed Matter, 2004, 16, pp.S2439-S2453. ⟨10.1088/0953-8984/16/26/017⟩. ⟨hal-00021588⟩