FIG. 5.

Effects of the ssp mutations on 4521 expression in a strain carrying a gain-of-function SasS sensor mutation. β-Galactosidase specific activity levels of the gain-of-function sasS suppressor strain DK6625 (asgB480 sasB7) (○) are compared to those of the following strains: HK1119 (asgB480 sasB7 ssp5) (●), HK1123 (asgB480 sasB7 ssp9) (▴), HK1124 (asgB480 sasB7 ssp10) (⧫), and HK1125 (asgB480 sasB7 ssp11) (■). β-Galactosidase specific activity was measured as described in Materials and Methods. The data represent the average of at least three independent experiments; error bars indicate standard deviations. ONP, o-nitrophenol.