Fig. 4. Up-regulation of rpoS translation by DsrA in hfq⁺ and hfq⁻ cells.

Cells containing pDsrA, which were grown at 37°C, were induced with 0.02% arabinose and IPTG at increasing concentrations from 0 to 0.1 mM and LacZ activity was measured. The indicated values were calculated from at least three independent experiments. Error bars represent SD. Δ3, arcZ⁻ dsrA⁻ rprA⁻ hfq⁺; Δ3Δhfq, arcZ⁻ dsrA⁻ rprA⁻ hfq⁻; ΔaΔr, arcZ⁻ dsrA⁺ rprA⁻ hfq⁺; V, vector control.