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DsrA RNA

Non-coding RNA

Non-coding RNA

FieldValue
NameDsrA RNA
imageRF00014.jpg
captionPredicted secondary structure and sequence conservation of DsrA
SymbolDsrA
RfamRF00014
RNA_typeGene; sRNA
Tax_domainBacteria
SO

DsrA RNA is a non-coding RNA that regulates both transcription, by overcoming transcriptional silencing by the nucleoid-associated H-NS protein, and translation, by promoting efficient translation of the stress sigma factor, RpoS. These two activities of DsrA can be separated by mutation: the first of three stem-loops of the 85 nucleotide RNA is necessary for RpoS translation but not for anti-H-NS action, while the second stem-loop is essential for antisilencing and less critical for RpoS translation. The third stem-loop, which behaves as a transcription terminator, can be substituted by the trp transcription terminator without loss of either DsrA function. The sequence of the first stem-loop of DsrA is complementary with the upstream leader portion of RpoS messenger RNA, suggesting that pairing of DsrA with the RpoS message might be important for translational regulation. The structures of DsrA and DsrA/rpoS complex were studied by NMR. The study concluded that the sRNA contains a dynamic conformational equilibrium for its second stem–loop which might be an important mechanism for DsrA to regulate the translations of its multiple target mRNAs.

There is evidence that DsrA RNA can self-assemble into nanostructures through antisense interactions of three self-complementary regions.

Targets of DsrA

There is experimental evidence to suggest that DsrA interacts with the protein-coding genes hns, rbsD, argR, ilvI and rpoS via an anti-sense mechanism.

DsrA folds into a structure with three hairpins. The second of these (nucleotides 23–60) binds to Hfq.

References

References

  1. Sledjeski, D. (1995). "A small RNA acts as an antisilencer of the H-NS-silenced rcsA gene of Escherichia coli". Proc Natl Acad Sci USA.
  2. Majdalani, N. (1998). "DsrA RNA regulates translation of RpoS message by an anti-antisense mechanism, independent of its action as an antisilencer of transcription". Proc Natl Acad Sci USA.
  3. Gottesman, S. (2005). "Micros for microbes: non-coding regulatory RNAs in bacteria". Trends Genet.
  4. (2017-09-19). "The important conformational plasticity of DsrA sRNA for adapting multiple target regulation". Nucleic Acids Research.
  5. (2009). "A Nanostructure Made of a Bacterial Noncoding RNA.". J Am Chem Soc.
  6. (2009). "Auto-assembly of E. coli DsrA small noncoding RNA: Molecular characteristics and functional consequences..". RNA Biol..
  7. (1998). "Riboregulation in Escherichia coli: DsrA RNA acts by RNA:RNA interactions at multiple loci.". Proc Natl Acad Sci U S A.
  8. (2007). "Translational control and target recognition by Escherichia coli small RNAs in vivo.". Nucleic Acids Res.
  9. Lease RA Belfort M. (2000). "A trans-acting RNA as a control switch in Escherichia coli: DsrA modulates function by forming alternative structures.". Proc Natl Acad Sci U S A.
  10. (1998). "DsrA RNA regulates translation of RpoS message by an anti-antisense mechanism, independent of its action as an antisilencer of transcription.". Proc Natl Acad Sci U S A.
  11. (2001). "Regulation of RpoS by a novel small RNA: the characterization of RprA.". Mol Microbiol.
  12. (1996). "The small RNA, DsrA, is essential for the low temperature expression of RpoS during exponential growth in Escherichia coli.". EMBO J.
  13. (2001). "Hfq is necessary for regulation by the untranslated RNA DsrA.". J Bacteriol.
  14. Brescia, CC. (Jan 2003). "Identification of the Hfq-binding site on DsrA RNA: Hfq binds without altering DsrA secondary structure.". RNA.
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