Fig. 1.

Relative position of the C. trachomatisnrdABpromoter and predicted NrdR boxes. (A) Sequence alignment of the nrdABpromoter regions from C. trachomatis(C.tr), C. muridarum(C.mu), C. felis(C.fe), C. abortus(C.ab), C. caviae(C.ca), and C. pneumoniae(C.pn). The transcription start site mapped in C. trachomatisserovar D is marked by an asterisk (*), and the −35 and −10 promoter elements are underlined and shown in bold. Predicted NrdR boxes are highlighted in gray and aligned with the bacterial NrdR box consensus sequence (24). (B) Diagram showing position of NrdR boxes (gray rectangles) relative to the −35 and −10 elements (black rectangles) in the nrdABpromoters from C. trachomatis, E. coli, and the E. colinrdHpromoter.