Abstract
The OxyS regulatory RNA integrates the adaptive response to hydrogen peroxide with other cellular stress responses and protects against DNA damage. Among the OxyS targets is the rpoS-encoded sigma(s) subunit of RNA polymerase. Sigma(s) is a central regulator of genes induced by osmotic stress, starvation and entry into stationary phase. We examined the mechanism whereby OxyS represses rpoS expression and found that the OxyS RNA inhibits translation of the rpoS message. This repression is dependent on the hfq-encoded RNA-binding protein (also denoted host factor I, HF-I). Co-immunoprecipitation and gel mobility shift experiments revealed that the OxyS RNA binds Hfq, suggesting that OxyS represses rpoS translation by altering Hfq activity.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Bacterial Proteins / physiology*
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Base Sequence
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Carrier Proteins / physiology*
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DNA-Binding Proteins*
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Escherichia coli
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Escherichia coli Proteins*
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Host Factor 1 Protein
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Integration Host Factors
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Molecular Sequence Data
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Nucleic Acid Conformation
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Oxidative Stress / physiology
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Precipitin Tests
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RNA, Bacterial / physiology*
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RNA-Binding Proteins / physiology
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Regulatory Sequences, Nucleic Acid / physiology*
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Repressor Proteins / physiology*
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Sigma Factor / physiology*
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Transcription Factors / physiology
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Untranslated Regions / physiology*
Substances
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Bacterial Proteins
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Carrier Proteins
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DNA-Binding Proteins
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Escherichia coli Proteins
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Host Factor 1 Protein
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Integration Host Factors
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RNA, Bacterial
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RNA-Binding Proteins
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Repressor Proteins
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Sigma Factor
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Transcription Factors
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Untranslated Regions
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integration host factor, E coli
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oxyR protein, E coli
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sigma factor KatF protein, Bacteria