A trans-acting riboswitch controls expression of the virulence regulator PrfA in Listeria monocytogenes
2009 (English)In: Cell, ISSN 0092-8674, E-ISSN 1097-4172, Vol. 139, no 4, 770-779 p.Article in journal (Refereed) Published
Riboswitches are RNA elements acting in cis, controlling expression of their downstream genes through a metabolite-induced alteration of their secondary structure. Here, we demonstrate that two S-adenosylmethionine (SAM) riboswitches, SreA and SreB, can also function in trans and act as noncoding RNAs in Listeria monocytogenes. SreA and SreB control expression of the virulence regulator PrfA by binding to the 5´-untranslated region of its mRNA. Absence of the SAM riboswitches SreA and SreB increases the level of PrfA and virulence gene expression in L. monocytogenes. Thus, the impact of the SAM riboswitches on PrfA expression highlights a link between bacterial virulence and nutrient availability. Together, our results uncover an unexpected role for riboswitches and a distinct class of regulatory noncoding RNAs in bacteria.
Place, publisher, year, edition, pages
2009. Vol. 139, no 4, 770-779 p.
Listeria, riboswitch, SreA, PrfA
Biochemistry and Molecular Biology
Research subject Molecular Biology
IdentifiersURN: urn:nbn:se:umu:diva-33105DOI: 10.1016/j.cell.2009.08.046PubMedID: 19914169OAI: oai:DiVA.org:umu-33105DiVA: diva2:310102