mLife (Jun 2023)

A DnaA‐dependent riboswitch for transcription attenuation of the his operon

  • Yuan Yao,
  • Hongwei Sun,
  • Wurihan,
  • Gegeheng,
  • Gezi,
  • Kirsten Skarstad,
  • Lifei Fan,
  • Morigen

DOI
https://doi.org/10.1002/mlf2.12075
Journal volume & issue
Vol. 2, no. 2
pp. 126 – 140

Abstract

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Abstract Transcription attenuation in response to the availability of a specific amino acid is believed to be controlled by alternative configurations of RNA secondary structures that lead to the arrest of translation or the release of the arrested ribosome from the leader mRNA molecule. In this study, we first report a possible example of the DnaA‐dependent riboswitch for transcription attenuation in Escherichia coli. We show that (i) DnaA regulates the transcription of the structural genes but not that of the leader hisL gene; (ii) DnaA might bind to rDnaA boxes present in the HisL‐SL RNA, and subsequently attenuate the transcription of the operon; (iii) the HisL‐SL RNA and rDnaA boxes are phylogenetically conserved and evolutionarily important; and (iv) the translating ribosome is required for deattenuation of the his operon, whereas tRNAHis strengthens attenuation. This mechanism seems to be phylogenetically conserved in Gram‐negative bacteria and evolutionarily important.

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