Fig. 1

Acetate and yeast extract (YE) synergistically induce hilA expression in the wild type (a) but not a ΔhilE mutant (b). Expression was determined by measuring β-galactosidase activity using transcriptional fusions of the hilA promoter to LacZ during growth in TB medium with the specified amount of yeast extact added. Sodium acetate was added at a concentration of 10 mM. Results show the mean and standard deviation from three biological replicates