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The 5′ end of theEnterococcus faecalis pyr operon specifies, in order, the promoter, a 5′ untranslated leader, thepyrR gene encoding the regulatory protein for the operon, a 39-nucleotide (nt) intercistronic region, thepyrP gene encoding a uracil permease, a 13-nt intercistronic region, and thepyrB gene encoding aspartate transcarbamylase. The 5′ leader RNA is capable of forming stem-loop structures involved in attenuation control of the operon. No attenuation regions, such as those found in theBacillus subtilis pyr operon, are present in thepyrR-pyrP orpyrP-pyrB intercistronic regions. Several lines of evidence demonstrate that theE. faecalis pyr operon is repressed by uracil via transcriptional attenuation at the single 5′ leader termination site and that attenuation is mediated by the PyrR protein.

The Enterococcus faecalis pyr Operon Is Regulated by Autogenous Transcriptional Attenuation at a Single Site in the 5′ Leader