FIG 4.

Promoter regions of dctA (A) and dcuB (B) and binding sites for transcriptional regulators DcuR, cAMP-CRP, FNR, ArcA, NarL and Lrp. The binding sites have been determined experimentally (solid line) (101–103) or by the presence of consensus sites (broken lines). Transcriptional regulators exerting positive (green) or negative (red) regulation on the promoter are annotated. Numbering gives the position relative to the transcriptional start sites of the promoters. The location of the binding sites for NarL and Lrp at dcuB have not been identified.