FIG. 2.

Hfq is required for the decrease in OMP RNAs levels after σ^E overexpression. The averaged mRNA expression ratios for rpoE (σ^E) and the downregulated RNAs (tsx, fiu, ompX, ompF, ompA, lpp, ompC, and yhcN) derived from the microarray data presented in Fig. 1 are compared in various strains: hfq⁺ versus hfq mutant, rseA⁺ versus rseA mutant (wt versus drseA) and 20 min after overexpression of σ^E in both hfq⁺ (hfq+ versus hfq+ o/exp rpoE) and hfq mutant strains (hfq+ versus hfq− o/exp rpoE). Error bars represent one standard deviation.