Dresden 2014 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.73: Poster
Mittwoch, 2. April 2014, 15:00–19:00, P3
Interaction of semiflexible filamentous virus particles with freestanding lipid membranes — •Anastasiia B. Artemieva, Petra Schwille, and Eugene P. Petrov — Max Planck Institute of Biochemistry, 82152 Martinsried, Germany
Recently, an unexpected phenomenon [1] of membrane-driven coil-globule transition of DNA macromolecules electrostatically adsorbed to strongly charged freestanding cationic lipid bilayers [2] has been observed experimentally. To elucidate the effect of the polyelectrolyte persistence length in membrane-driven polyelectrolyte condensation, we study the behavior of much stiffer semiflexible fd virus particles (lp ∼ 2.2 µm) electrostatically adsorbed on freestanding cationic lipid membranes. At low membrane charge densities, membrane-adsorbed fd virus particles behave as semiflexible filaments in 2D. However, at higher membrane charge densities, membrane-driven interactions are strong enough to induce the membrane-driven collapse of the relatively stiff fd virus particles, which agrees with the predictions of the recent theory of membrane-driven polyelectrolyte condensation [3]. Further, for fd virus particles adsorbed at higher surface densities on weakly charged membranes we observe a new effect of membrane-driven self-organization of the virus particles into long linear chain aggregates.
[1] C. Herold, P. Schwille, and E. P. Petrov, Phys. Rev. Lett. 104 (2010) 148102.
[2] C. Herold, G. Chwastek, P. Schwille, and E. P. Petrov, Langmuir 28 (2012) 5518.
[3] A. G. Cherstvy and E. P. Petrov, PCCP (2014) in press.