FIG 3.

Regulation of the catDE operon by three transcription factors. (A) The promoter sequence of the catDE operon: −10, −35, and the transcriptional start site (+1) are highlighted in blue; the two CatR boxes are indicated by orange arrows; the YodB box is indicated by a light blue arrow; the Fur box is underlined. (B) The catD mRNA levels were compared among different strains grown in LB medium without or with 100 µM dipyridyl using qPCR. (C) The catD mRNA levels were compared among different strains grown in Belitsky minimal medium without or with 2 mM catechol using qPCR. The 23S rRNA gene was used as an internal control for both panels B and C.