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. 2019 Jul 12;10:1563. doi: 10.3389/fmicb.2019.01563

Figure 2.

Figure 2

Histogram presentation of β-galactosidase specific activities. Values are the means ± standard deviation of at least three biological replicates. (A) Specific activities measured in cell-free extracts of E. coli strain FW102 (WT) and its isogenic lrp (lrp::Tn10) derivative bearing a single-copy lacZ reporter gene fusion under the control of the artP, artJ, or hisJ promoter/operator grown on minimal medium. 100% corresponds for each fusion construct to the activity measured in the wild type strain. (B) Specific activities of a single-copy lacZ reporter gene under the control of the artP promoter/operator measured in cell-free extracts of FW102 (WT) and its isogenic lrp (lrp::Tn10), argR (∆argR), and double argR lrp (lrp::Tn10/∆argR) mutant derivatives. Cells were grown on minimal medium, supplemented with l-arginine, l-leucine, or both, as indicated. 100% corresponds to the value obtained for the wild type strain grown on minimal medium (black colored bar).