MtvR regulates the mRNA levels of the E. coli and P. aeruginosa hfq genes.

(A) Levels the hfq_Ec mRNA and the MtvR transcript in cells of the E. coli WT or the E. coli Δhfq mutant, expressing (+pMtvR) or not the sRNA. (B) Stability of the hfq_Ec mRNA (left panel) in cells expressing (+pMtvR) or not MtvR, and of the MtvR transcript (right panel) in cells of the WT or Δhfq mutant, expressing MtvR (+pMtvR). (C) Levels of the hfq_Pa mRNA and the MtvR transcript in cells of the P. aeruginosa WT or WT with the hfq gene silenced (hfq^sil), expressing (+pMtvR) or not MtvR. (D) Analysis of the stability of the P. aeruginosa hfq_Pa mRNA and of the MtvR transcript, in cells of the P. aeruginosa strains WT or the WT with the hfq gene silenced (hfq^sil), expressing (+pMtvR) or not MtvR. The levels of the 5S rRNA were used as loading control.