Molecular theory of asymmetrically charged bilayers: Preferred curvaturesY. Li and B.-Y. Ha
Department of Physics, University of Waterloo - Waterloo, Ontario N2L 3G1, Canada
received 15 December 2004; accepted in final form 17 March 2005
published online 8 April 2005
We study the preferred curvature of asymmetrically charged bilayers (as in red blood cell membranes), in which the inner layer is negatively charged while the outer one is neutral. In particular, we present a molecular theory for the computation of the relaxed-area difference and the spontaneous curvature C0 of the bilayer. Our approach shows how packing properties of lipids and counterion (e.g., ) valence are intertwined. We find that has a dramatic effect on and C0: For wide parameter ranges, the presence of 0.1 of ensures positive and C0 that are nominally negative.
87.15.-v - Biomolecules: structure and physical properties.
87.15.La - Mechanical properties.
© EDP Sciences 2005