Abstract
Cell mechanisms are actively modulated by membrane dynamics. We studied the dynamics of a first-stage biomimetic system by Fluorescence Recovery After Patterned Photobleaching. Using this simple biomimetic system, constituted by \(\alpha\) -hemolysin from Staphylococcus aureus inserted as single heptameric pore or complexes of pores in a glass-supported DMPC bilayer, we observed true diffusion behavior, with no immobile fraction. We find two situations: i) when incubation is shorter than 15 hours, the protein inserts as a heptameric pore and diffuses roughly three times more slowly than its host lipid bilayer; ii) incubation longer than 15 hours leads to the formation of larger complexes which diffuse more slowly. Our results indicate that, while the Saffman-Delbruck model adequately describes the diffusion coefficient D for small radii, D of the objects decreases as 1/R 2 for the size range explored in this study. Additionally, in the presence of inserted proteins, the gel-to-fluid transition of the supported bilayer as well as a temperature shift in the gel-to-fluid transition are observed.
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Harb, F., Sarkis, J., Ferte, N. et al. Beyond Saffman-Delbruck approximation: A new regime for 2D diffusion of α-hemolysin complexes in supported lipid bilayer. Eur. Phys. J. E 35, 118 (2012). https://doi.org/10.1140/epje/i2012-12118-6
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DOI: https://doi.org/10.1140/epje/i2012-12118-6