FIG. 7.
Identification of the X. campestris pv. campestris σE promoter recognition sequence. (A) Alignment of σE-dependent promoters identified by primer extension assays. The transcription start site is underlined, and the −35 and −10 motifs are boxed. (B) The aligned promoter sequences were analyzed using the WebLogo program (http://weblogo.berkeley.edu/). The height of a stack indicates sequence conservation (2 = 100% conservation), and the height of each individual nucleotide within the stack indicates its relative frequency at that position.