Fig 7.

DNA sequence of the promoter region of the devB gene. The regions of NtcA interaction, as deduced from DNase I footprinting, between the two identified TSPs are indicated with shading, and some hypersensitive positions are indicated with arrowheads. Arrows denote the TSPs, and horizontal lines denote A+T stretches (see the text). Putative −10 boxes, the distal promoter NtcA-binding site, and the sequence upstream of the proximal promoter resembling an NtcA-binding site (see the text) are also indicated.