Part:BBa_K3771047
PkatG
Description
PkatG is the promoter of the katG gene. KatG protein has the function of bifunctional hydroperoxidase I (HPI) and plays an important role in oxidative stress response. The katG promoter (PkatG) is stimulated by oxidative stress, leading to the expression of the downstream gene. Besides, PkatG is activated by OxyR protein[1].
Figure 1. Transcription unit of the katG gene in E. coli K-12[2].
Usage and Biology
After conducting colony PCR from the E. coli MG1655, the PkatG fragment can be amplified from the chromosome and the experiment result can be checked by agarose gel electrophoresis. The result is shown in Figure 2.
Figure 2. The electrophoresis result of PkatG fragment from the chromosome PCR. M: Marker; Lane 1: katG promoter (PkatG) (217 bp).
The promoter strength of PkatG is determined by the expression level of the reporter, sfGFP, under oxidative stress. While using hydrogen peroxide (H2O2) as the inducer, the strength of PkatG shows no significant difference under different concentrations of hydrogen peroxide (Figure 3). In addition, using paraquat (PQ), which is a commonly used agent to induce oxidative stress for bacteria (Figure 4 & 5), as an inducer still doesn’t induce PkatG.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BglII site found at 6
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
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