Journal
MOLECULAR CELL
Volume 29, Issue 6, Pages 691-702Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2008.01.012
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Funding
- Howard Hughes Medical Institute Funding Source: Medline
- NIDDK NIH HHS [R33 DK07027, R33 DK070270-02, R33 DK070270, R33 DK070270-02S1] Funding Source: Medline
- NIGMS NIH HHS [R01 GM068819-03, R01 GM068819, T32 GM007223, GM 068819, T32GM007223] Funding Source: Medline
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We have identified a highly conserved RNA motif that occurs upstream of genes involved in S-adenosyl-L-methionine (SAM) recycling in many Gram-positive and Gram-negative species of bacteria. The phylogenetic distribution and the conserved structural features of representatives of this motif are indicative of riboswitch function. Riboswitches; are widespread metabolite-sensing gene control elements that are typically found in the 5' untranslated regions (UTRs) of bacterial mRNAs. We experimentally verified that examples of this RNA motif specifically recognize S-adenosylhomocysteine (SAH) in protein-free in vitro assays, and confirmed that these RNAs strongly discriminate against SAM and other closely related analogs. A representative SAH motif was found to activate expression of a downstream gene in vivo when the metabolite is bound. These observations confirm that SAH motif RNAs are distinct ligand-binding aptamers; for a riboswitch class that selectively binds SAH and controls genes essential for recycling expended SAM coenzymes.
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