Figure 3.
Post-transcriptional regulation of the pyr operon. (a) The three attenuation regions in the operon. (b) Two alternative secondary structures of the transcript of each attenuation region.
In the presence of high UMP concentration, PyrR binds to the anti-antiterminator and
stabilizes the formation of the terminator structure, while preventing the formation
of the antiterminator.
Terai et al. Genome Biology 2001 2:research0048.1 doi:10.1186/gb-2001-2-11-research0048