Regulatory Interplay between RNase III and Antisense RNAs in E. coli: the Case of AsflhD and FlhD, Component of the Master Regulator of Motility
Résumé
ABSTRACT In order to respond to ever-changing environmental cues, bacteria display
resilient regulatory mechanisms controlling gene expression. At the post-transcriptional
level, this is achieved by a combination of RNA-binding proteins, such as ribonucleases
(RNases), and regulatory RNAs, including antisense RNAs (asRNAs). Bound to their complementary
mRNA, asRNAs are primary targets for the double-strand-specific endoribonuclease,
RNase III. Taking advantage of our own and previously published transcriptomic
data sets obtained in strains inactivated for RNase III, we selected several candidate
asRNAs and confirmed the existence of RNase III-sensitive asRNAs for crp, ompR, phoP,
and flhD genes, all encoding global regulators of gene expression in Escherichia coli. Using
FlhD, a component of the master regulator of motility (FlhD4C2), as our model, we demonstrate
that the asRNA AsflhD, transcribed from the coding sequence of flhD, is involved in
the fine-tuning of flhD expression and thus participates in the control of motility.
Domaines
Sciences du Vivant [q-bio]
Origine : Fichiers produits par l'(les) auteur(s)