Fig. 1.

Schematic representation of the eut operon in E. faecalis with a magnified view of the eutT-eutG intergenic region. RR and HK indicate the rr17 and hk17 genes (aka eutV and eutW, respectively [15]) encoding the response regulator and histidine kinase, respectively. Shown is the approximate location of the B12 riboswitch, followed by the distal terminator loop, the promoters (bent arrows), and the antiterminator-terminator loops preceding the eutG gene. The contents of the fragments cloned in plasmid pTCVlacSpec and used as templates in the transcription analyses are also illustrated by the lines.