FIG. 1.
Key regulatory elements control ilv and ybgE gene expression. Locations of the TnrA binding site (TBS), catabolite response element site (cre), and CodY binding sites (low-affinity CBS I and high-affinity CBS II) are indicated as black and gray squares. The terminator stem-loop in the ilvB operon 5′ untranslated region is depicted as a lollipop structure. Experimentally determined transcription start sites are indicated by +1 and an arrow, and predicted translational start sites are indicated by the initiation codon and an asterisk.