Incoherent dual regulation by a SAM-II riboswitch controlling translation at a distance.

In , the methionine biosynthesis genes and are preceded by S-adenosyl-L-methionine (SAM) riboswitches of the SAM-II class. Upon SAM binding, structural changes in the riboswitch were predicted to cause transcriptional termination, generating the sRNA RZ. By contrast, the riboswitch was predicted to regulate translation from an AUG1 codon.