The Escherichia coli OxyS regulatory RNA represses fhlA translation by blocking ribosome binding.
OxyS is a small untranslated RNA which is induced in response to oxidative stress in Escherichia coli. This novel RNA acts as a global regulator to activate or repress the expression of as many as 40 genes, including the fhlA-encoded transcriptional activator and the rpoS-encoded sigma(s) subunit of RNA polymerase. Deletion analysis of OxyS showed that different domains of the small RNA are required for the regulation of fhlA and rpoS. We examined the mechanism of OxyS repression of fhlA and found that the OxyS RNA inhibits fhlA translation by pairing with a short sequence overlapping the Shine-Dalgarno sequence, thereby blocking ribosome binding/translation.
Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA.
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Altuvia
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Zhang
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Argaman
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Tiwari
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Storz
D001483:Base Sequence; D019281:Dimerization; D004926:Escherichia coli; D029968:Escherichia coli Proteins; D008969:Molecular Sequence Data; D016296:Mutagenesis; D009690:Nucleic Acid Conformation; D009692:Nucleic Acid Heteroduplexes / Q000378:metabolism; D018384:Oxidative Stress / Q000235:genetics; D012329:RNA, Bacterial / Q000737:chemistry / Q000494:pharmacology / Q000502:physiology*; D012045:Regulatory Sequences, Nucleic Acid / Q000502:physiology*; D012270:Ribosomes / Q000235:genetics / Q000378:metabolism; D015534:Trans-Activators / Q000037:antagonists & inhibitors / Q000096:biosynthesis / Q000235:genetics*; D020506:Untranslated Regions / Q000502:physiology
D029968:Escherichia coli Proteins; D009692:Nucleic Acid Heteroduplexes; D012329:RNA, Bacterial; D015534:Trans-Activators; D020506:Untranslated Regions; C067189:fhlA protein, E coli