FIGURE 1.

Growth of sdiA-deficient and overexpression strains under acid stress. (A,B) The indicated Escherichia coli SM10λpir and E. coli BW25113 strains in exponential phase were collected and re-cultured for 24 h in LBG medium with different initial pH values obtained by the addition of citric acid. The samples were collected at the indicated time points, and the OD₆₀₀ values were determined. The curve of each strain growth was shown. WT, E. coli SM10λpir or E. coli BW25113 carrying pROp200; ΔsdiA, E. coli SM10λpirΔsdiA or E. coli BW25113ΔsdiA carrying pROp200; ΔsdiA-SidA, E. coli SM10λpirΔsdiA or E. coli BW25113ΔsdiA carrying pROp200-sdiA.