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Diagram of the C. trachomatis pgk gene and hrcA-grpE-dnaK operon. Arrows indicate the approximate locations of transcription start sites. (A) Upstream of the pgk gene are two overlapping promoters recognized by σ66 and σ28 RNA polymerases, respectively. (B) The σ66 promoter for the hrcA-grpE-dnaK operon is located upstream of hrcA, while a σ28 promoter is located upstream of dnaK within the coding region of grpE. The figure is not drawn to scale.
