Fig. 6.

Activities of the reporter fusions in the heterologous host E. coli. The lacZ reporter fusions with the promoter regions of orp1 (A), DVU2106 (B), and orp2 (C) are represented on the left. The transcript start sites are indicated by bent arrows. The positions of the −10 and −35 consensus sequences of the σ⁷⁰ promoter and of the −12 and −24 consensus sequences of the σ⁵⁴ promoters are indicated by black rectangles. The β-galactosidase activities of these reporter fusions in various backgrounds are shown on the right: the E. coli wild-type strain and its isogenic rpoN derivative in the absence (dark-gray and white bars, respectively) or presence (light-gray and black bars, respectively) of DVU2106 production. The activity is the average of three independent measurements (the error bars show the standard deviations).