Fig 2.

β-Galactosidase expression of four different hdeA-lacZ fusions in the PatE⁻ and PatE⁺ backgrounds. The numbering of the various hdeA fragments is relative to the hdeA transcriptional start site. The values for β-galactosidase activity are means and standard deviations for three independent assays. Promoter activities were determined for bacteria grown to the exponential or stationary phase in LB at 37°C. The fold activation (fold act) is the value for the β-galactosidase activity of the PatE⁺ strain EDL933(Δ3 Δstx1-2)/pJB11 divided by that of the PatE⁻ control EDL933(Δ3 Δstx1-2)/pACYC184.