FIG. 3.

Effect of a loss-of-function mutation in sicA on the expression of sipC. The levels of C2,3D in the S. enterica serovar Typhimurium strain SB227, which carries an sipC::xylE gene fusion, and in its derivative strain SB266, which carries a loss-of-function mutation in sicA, were measured as described in Materials and Methods. Activity is expressed as percentage of wild-type activity, which was considered 100.