Fig. 2

Topology and sequence analysis of CO-regulated promoters in C. amalonaticus Y19. The putative CRP- and CooA-binding sites are indicated with arrows, and the promoter elements (−10/−35) are shown in boxes. The numbers in parentheses after CooA and/or CRP indicate matches between each inverted repeat and the consensus sequence motifs (CooA or CRP). The CooA-binding inverted repeat towards the CO-hyd operon is a perfectly symmetrical (9/9, 9/9), 9-bp match with that of the CooA/CRP operator reported in Rhodospirillum rubrum and other carboxydotrophs (TGTC(A/G)N6(C/T)GACA)