The promoter/operator regions of the C. glutamicum fpr2 and cysI genes. The determined transcriptional start points of the two transcriptional units fpr2 (A) and cysIXHDNYZ (B) are marked as '+1'. Parts of the two potential promoters (-35, -10, +1) are overlined, bases in bold type in these regions indicate bases matching the C. glutamicum σ70 consensus promoter . DNA motifs matching the consensus sequence of the McbR binding-site are boxed. Bases in bold italics mark potential ribosome binding-sites, open underlining arrows indicate the annotated starts of genes.