Figure 2. The relative contributions of OmpR and DNA relaxation to promoter activity.

GFP production from transcriptional reporter fusions was measured in ΔompB mutant cells carrying either an arabinose-inducible ompR-envZ operon (pBADompB) or the empty pBAD vector. The mean and range of expression from 3 biological replicates is plotted as in Figure 1B.