Skip to main content
. 2007 Aug 31;93(12):4289–4299. doi: 10.1529/biophysj.107.116681

FIGURE 2.

FIGURE 2

Intrinsic tryptophan fluorescence spectra of pleurocidin Trp-2, as in Fig. 1, but at 298 K, where the model membranes can be expected to be more ordered. The red shift and reduction in fluorescence intensity observed in the presence of increasing concentrations of cholesterol in the liposomes is more noticeable for liposomes containing POPE as the zwitterionic lipid (C) compared with POPC (A). The Stern-Vollmer plots of the effect of adding an aqueous acrylamide quencher reveals the depth of pleurocidin penetration into the same liposomes comprising either POPC (B) or POPE (D) as the zwitterionic lipid.