FIG. 2.
FimY and FimZ are strong activators of each other's expression and also weak autoactivators. Shown is a comparison of the PfimY and PfimZ promoter activities in a serovar Typhimurium ΔfimYZ mutant (A) and E. coli (B) in which FimY and FimZ are independently expressed from an aTc-inducible promoter on a plasmid. Note that tetR is also expressed from this plasmid in order to achieve aTc-inducible expression. Data are averages of the results from three experiments. Each experiment was done in triplicate.