Figure 5.
Alignment of CtrA-Boxes and σ73-dependent class II promoters. The −10, −35 regions, based on the σ73-dependnet consensus (40), and the highly conserved sequences within the spacer region are boxed. Nucleotides that are identical to the consensus sequences are underlined. Transcription start sites are shown in boldface. The two direct repeats of the conserved CtrA binding sequence (7) lie within conserved −35 and spacer regions, respectively, and are indicated by arrows at the top of the figure. Promoter sequences shown correspond to fliF (27), fliL (42), fliQ (43), rpoN (30), hemE (44), ccrM (45), and divK (A. K. Benson and A.N., unpublished data). N, any nucleotides; S, G or C; W, A or T.