Figure 4.
Membrane activity and conductance of single pores is affected by proline substitutions in putative transmembrane α-helices. (A) Overall membrane activities of intact CyaA and its mutant variants on asolectin/decane:butanol (9:1) membranes. The applied membrane potential was −50 mV and the temperature was 25 °C. (B) Detail of most frequent conductance states on asolectin/decane:butanol (9:1) membranes (filtered at 10 Hz). The presented events were acquired on several different asolectin membranes for each toxin. Measurement conditions: 150 mM KCl, 10 mM Tris-HCl (pH 7.4), 2 mM CaCl2, toxin concentration 1 nM, transmembrane potential −50 mV.