FIG. 3.

A common sequence pattern in the 200-bp regions upstream of σ^S-controlled core genes strongly resembles an extended −10 region previously discussed for σ^S-dependent promoters. Relative frequencies of nucleotides as identified by BioProspector (40) are shown in the table and correspond to positions −14 to −4 in putative σ^S-dependent promoters. A consensus sequence (Con) is given as well as a degenerate consensus (Deg), which also takes into account the second-most-frequent nucleotide if it occurs in more than 30% of the sequences identified (K stands for T or G, Y stands for T or C, and R stands for A or G). The consensus sequence is also shown as a sequence logo (14).