Difference between revisions of "Part:BBa K3733016"
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<p>The NarX/NarL two component system(TCS) can be activated if the concentration of nitrate is enough. So this NarX/NarL TCS can be designed the nitrate sensor with the PyeaR promoter. When there is enough nitrate, the NarX will change configuration and then phosphorylate. After that, the phosphorylated NarX will transport the phosphate group to NarL. Last, the phosphorylated NarL will bind to the certain sequence of PyeaR, and it acts as a transcription factor, which can active the downstream of PyeaR to transcription. </p> | <p>The NarX/NarL two component system(TCS) can be activated if the concentration of nitrate is enough. So this NarX/NarL TCS can be designed the nitrate sensor with the PyeaR promoter. When there is enough nitrate, the NarX will change configuration and then phosphorylate. After that, the phosphorylated NarX will transport the phosphate group to NarL. Last, the phosphorylated NarL will bind to the certain sequence of PyeaR, and it acts as a transcription factor, which can active the downstream of PyeaR to transcription. </p> | ||
| − | <p>In this part, we use the combination is | + | <p>In this part, we use the combination is J23100 -B0032. The promoter J23100 is the strong promoter, but B0032 is a medium RBS. </p> |
<p>To learn more about nitrate sensor system, a collection of this kind of nitrate sensor system were constructed. </p> | <p>To learn more about nitrate sensor system, a collection of this kind of nitrate sensor system were constructed. </p> | ||
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| − | <center><img src= https://static.igem.org/mediawiki/parts/ | + | <center><img src= https://static.igem.org/mediawiki/parts/6/6f/T--HZAU-China--BBa_K3733019_img1.png style="width:60% "></center> |
| − | <center><b>Figure 1. </b>The The nitrate response curve with | + | <center><b>Figure 1. </b>The The nitrate response curve with J23100- B0032 in <i>E.coli</i> DH5α and BL21. The red vertical line shows the concentration of <b>DSS induced in mouse</b>, while the green vertical line shows the concentration of <b>normal conditions</b>. The DSS induced animal model often used as an inflammation model. </center> |
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| − | <p> In this combination, the trends of the nitrate response curves of the two strains were similar, but DH5α had a significantly higher expression level. </p> | + | <p> In this combination, the trends of the nitrate response curves of the two strains were similar, but DH5α had a significantly higher expression level. In the end, they have similar expressions. </p> |
Latest revision as of 17:09, 21 October 2021
The nitrate sensor(J23100-B0032) system with neGFP
The NarXL is a the two-component signal system in E.coli, which each constitute a sensor histidine kinase and a response regulator. The NarX is sensor histidine kinase, which can phosphorylate NarL in response to nitrate and nitrite. And then the phosphorylated NarL will binding the site and activate the transcription of PyeaR promoter. So in this nitrate sensor system, we use J23100 (strong promoter) and B0032 (medium RBS) to produce NarX and NarL. When we add different concentrations of nitrate, and measurement the fluorescence intensity to reflect the expression level of PyeaR promoter.
Usage and Biology
The NarX/NarL two component system(TCS) can be activated if the concentration of nitrate is enough. So this NarX/NarL TCS can be designed the nitrate sensor with the PyeaR promoter. When there is enough nitrate, the NarX will change configuration and then phosphorylate. After that, the phosphorylated NarX will transport the phosphate group to NarL. Last, the phosphorylated NarL will bind to the certain sequence of PyeaR, and it acts as a transcription factor, which can active the downstream of PyeaR to transcription.
In this part, we use the combination is J23100 -B0032. The promoter J23100 is the strong promoter, but B0032 is a medium RBS.
To learn more about nitrate sensor system, a collection of this kind of nitrate sensor system were constructed.
BBa_K3733015: https://parts.igem.org/Part:BBa_K3733015
BBa_K3733016: https://parts.igem.org/Part:BBa_K3733016
BBa_K3733017: https://parts.igem.org/Part:BBa_K3733017
BBa_K3733018: https://parts.igem.org/Part:BBa_K3733018
BBa_K3733019: https://parts.igem.org/Part:BBa_K3733019
BBa_K3733020: https://parts.igem.org/Part:BBa_K3733020
BBa_K3733021: https://parts.igem.org/Part:BBa_K3733021
BBa_K3733022: https://parts.igem.org/Part:BBa_K3733022
BBa_K3733023: https://parts.igem.org/Part:BBa_K3733023
BBa_K3733028: https://parts.igem.org/Part:BBa_K3733028
BBa_K3733029: https://parts.igem.org/Part:BBa_K3733029
BBa_K3733030: https://parts.igem.org/Part:BBa_K3733030
BBa_K3733031: https://parts.igem.org/Part:BBa_K3733031
Functional Parameters
For the nitrate sensor sensitivity testing, we transformed the constructed plasmid with nitrate sensor into E.coli DH5α and BL21. The E.coli strain was cultured at 37°C overnight, and then diluted to OD600 = 0.4. And then, culture bacteria at 37°C for 2 hours, the potassium nitrate solution that has been serially diluted were add. After 8 hours inducing, we detected the expression of the neGFP by microplate reader.
In this combination, the trends of the nitrate response curves of the two strains were similar, but DH5α had a significantly higher expression level. In the end, they have similar expressions.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12INCOMPATIBLE WITH RFC[12]Illegal NheI site found at 7
Illegal NheI site found at 30 - 21INCOMPATIBLE WITH RFC[21]Illegal BglII site found at 2019
Illegal BglII site found at 2187 - 23COMPATIBLE WITH RFC[23]
- 25INCOMPATIBLE WITH RFC[25]Illegal AgeI site found at 2771
Illegal AgeI site found at 2894 - 1000COMPATIBLE WITH RFC[1000]