A global transcription factor. Activates transcription of the 9 following operons; yjjQ-bglJ, yjjP, acrEF, ybdO, yjcRQP, casABCDE12, rhsD-ybbC, fepE and gltF, in most cases it probably interferes with silencing by H-NS and activates transcription. Represses transcription of the 3 following operons; uxaCA, sdaCB and btsT. H-NS repression of the bgl operon, leading to the ability to metabolize some beta-glucosides. It also directly activates the bgl operon. Activation is H-NS and BglJ-RcsB independent. Gene expression is repressed by H-NS, activated by itself. More highly expressed in minimal than rich medium, poorly expressed in exoponential growth, levels increase in stationary phase (at protein level). Has no effect on leucine biosynthesis nor on bgl operon silencing. Belongs to the LysR transcriptional regulatory family. Extended N-terminus. Extended N-terminus.