FIG. 1.

Selected promoters repressed or activated by MarA. Marboxes are aligned with the −35 promoter motif. The first three sequences show all known directly repressed promoters, and the last two show typical directly activated promoters of classes I and II. Uppercase indicates the 20-bp marboxes; the putative −35 (and −10 for rob) promoter motifs are in boldface. Arrows show direction and location of the marboxes. A schematic MarA protein is shown with N and C termini oriented on the rob marbox. These data are according to references 10, 23, and 24.