FIG. 5.

Sequence logos for the −35 and −10 elements of the σ²⁸-dependent promoter. (A) Sequence recognized by C. trachomatis σ²⁸ RNA polymerase in the context of the C. trachomatis hctB promoter. (B) Sequence recognized by E. coli σ²⁸ RNA polymerase in the same promoter context. (C) The sequence logo based on the nucleotide frequencies of known bacterial σ²⁸ promoters. Details of the sequence logo format are presented in the Materials and Methods and Results sections. All sequence logos were derived using WebLogo, which is available online at http://weblogo.berkeley.edu.