FIG. 19.

Transcriptional organization and regulation of the ali-bad-hba supraoperonic cluster of R. palustris. The ali, bad, and hba genes are represented by yellow, blue, and green boxes, respectively. The enzymes encoded by the ali, bad, and hba genes and the reactions catalyzed by these enzymes are boxed with yellow, blue, and green, respectively. The badR, badM, and hbaR regulatory genes and the corresponding BadR, BadM, and HbaR regulators, respectively, are indicated in red. The AadR regulatory protein, which is encoded outside the clustering, is also shown (violet). The arrows at the top of the genes indicate that these genes constitute an operon (solid arrows) or a putative operon (dashed arrows). The badD, hbaA, and hbaR promoters that were reported to be controlled by the transcriptional regulators are shown (red bent arrows). The − and + symbols indicate transcriptional repression and activation, respectively.