FIG. 7.

P2 is an RpoS-dependent promoter of nhaA, as evidenced by plasmidic nhaA′-′lacZ fusion. Cells were grown to the stationary phase and treated as in Fig. 2. The plasmids, bearing the nhaA′-′lacZ fusion, differ in nhaA promoters as indicated. The host was OR200 (ΔnhaA ΔnhaR) or OR200 rpoS as indicated. Expression was monitored as β-galactosidase activity in Miller units. The data from one representative experiment of five very similar independent repetitions are shown.