FIG. 1.

SirA-dependent regulation of serovar Typhimurium sopB and flagellar regulon components during chemotaxing through three different types of 0.3% motility agar plates (T, TS, and LB) at 37°C. Each plate compares the expression of a particular promoter fusion in wild-type serovar Typhimurium (14028) compared to the isogenic sirA mutant (BA746). The plate type is indicated at the top of each column and the promoter being tested is indicated at the left of each row. Luminescence is pseudocolored, with blue indicating low intensity and red indicating high intensity. The fold difference between each pair of strains is indicated numerically. Each plate contains tetracycline for plasmid maintenance. These results are representative of at least five independent experiments. ∗, The fliA fusion gives variable results on TS and LB motility agar. See text for details.