Difference between revisions of "Part:BBa K4656003"
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<partinfo>BBa_K4656003 short</partinfo> | <partinfo>BBa_K4656003 short</partinfo> | ||
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The Lrp is a gene encoding leucine reactive protein, which is expressed by E. coli itself. It mediates a global response to leucine. Exogenous leucine affects the expression of a number of different operons, and Lrp mediates this effect for at least some of these operons. For example, it is a regulator of the branched-chain amino acid transport genes. | The Lrp is a gene encoding leucine reactive protein, which is expressed by E. coli itself. It mediates a global response to leucine. Exogenous leucine affects the expression of a number of different operons, and Lrp mediates this effect for at least some of these operons. For example, it is a regulator of the branched-chain amino acid transport genes. | ||
| − | In our project, Lrp dimerizes with butyrate, binds to pPchA promoter, and further | + | In our project, Lrp dimerizes with butyrate, binds to pPchA promoter, and further helps to produce pchA. |
===Usage and Biology=== | ===Usage and Biology=== | ||
LRP, as a component of the natural FIM system of E. coli, is a fimS regulator. Both LRP and IHF (Integrated Host factor) may act to regulate the actual inversion events through an involved DNA-binding protein complex. In addition, there is the OFF-to-ON inhibitory protein papB and many other hypothesized and known regulators that directly act on LRP. During the course of the project, the FIM system can be considered. (Additional background on FIM systems can be found in the references [1]) | LRP, as a component of the natural FIM system of E. coli, is a fimS regulator. Both LRP and IHF (Integrated Host factor) may act to regulate the actual inversion events through an involved DNA-binding protein complex. In addition, there is the OFF-to-ON inhibitory protein papB and many other hypothesized and known regulators that directly act on LRP. During the course of the project, the FIM system can be considered. (Additional background on FIM systems can be found in the references [1]) | ||
| − | === | + | ===Experimental results=== |
| − | In our project, it serves as the butyrate sensor to respond to the change in butyrate concentration, thereby activating downstream gene expression. During our experiments, we wondered whether it is possible to enhance the expression of Lrp in the engineered bacteria to increase the sensitivity of the PchA promoter to butyrate. | + | <html><BR><BR><center><img style="display: block;-webkit-user-select: none;margin: auto;background-color: hsl(0,0%,90%);transition: background-color 300ms;" src="https://static.igem.wiki/teams/4656/wiki/build3.png"width="600" height="300"></center></html> |
| − | We simultaneously introduced the pBAD33 plasmid carrying Lrp and the pet-28a plasmid containing the receptor into Escherichia coli. Bacteria that received only the receptor plasmid but not the Lrp plasmid were used as a control group. We compared the sensitivity of these two groups to butyrate | + | |
| + | <p>In our project, it serves as the butyrate sensor to respond to the change in butyrate concentration, thereby activating downstream gene expression. During our experiments, we wondered whether it is possible to enhance the expression of Lrp in the engineered bacteria to increase the sensitivity of the PchA promoter to butyrate.</p> | ||
| + | <html><BR><BR><center><img style="display: block;-webkit-user-select: none;margin: auto;background-color: hsl(0,0%,90%);transition: background-color 300ms;" src="https://static.igem.wiki/teams/4656/wiki/test3.png"width="600" height="200"></center></html> | ||
| + | <p>We simultaneously introduced the pBAD33 plasmid carrying Lrp and the pet-28a plasmid containing the receptor into Escherichia coli. Bacteria that received only the receptor plasmid but not the Lrp plasmid were used as a control group. We compared the sensitivity of these two groups to butyrate.</p> | ||
| + | <html><BR><BR><center><img style="display: block;-webkit-user-select: none;margin: auto;background-color: hsl(0,0%,90%);transition: background-color 300ms;" src="https://static.igem.wiki/teams/4656/wiki/learn3.png"width="950" height="300"></center></html> | ||
| + | <p>Both groups were cultured in 0mM, 10mM, and 20mM sodium butyrate, and the results demonstrated that increased expression of Lrp did enhance the sensitivity of the PchA promoter to butyrate.</p> | ||
===Reference=== | ===Reference=== | ||
Latest revision as of 09:37, 7 October 2023
Lrp
The Lrp is a gene encoding leucine reactive protein, which is expressed by E. coli itself. It mediates a global response to leucine. Exogenous leucine affects the expression of a number of different operons, and Lrp mediates this effect for at least some of these operons. For example, it is a regulator of the branched-chain amino acid transport genes. In our project, Lrp dimerizes with butyrate, binds to pPchA promoter, and further helps to produce pchA.
Usage and Biology
LRP, as a component of the natural FIM system of E. coli, is a fimS regulator. Both LRP and IHF (Integrated Host factor) may act to regulate the actual inversion events through an involved DNA-binding protein complex. In addition, there is the OFF-to-ON inhibitory protein papB and many other hypothesized and known regulators that directly act on LRP. During the course of the project, the FIM system can be considered. (Additional background on FIM systems can be found in the references [1])
Experimental results
In our project, it serves as the butyrate sensor to respond to the change in butyrate concentration, thereby activating downstream gene expression. During our experiments, we wondered whether it is possible to enhance the expression of Lrp in the engineered bacteria to increase the sensitivity of the PchA promoter to butyrate.
We simultaneously introduced the pBAD33 plasmid carrying Lrp and the pet-28a plasmid containing the receptor into Escherichia coli. Bacteria that received only the receptor plasmid but not the Lrp plasmid were used as a control group. We compared the sensitivity of these two groups to butyrate.
Both groups were cultured in 0mM, 10mM, and 20mM sodium butyrate, and the results demonstrated that increased expression of Lrp did enhance the sensitivity of the PchA promoter to butyrate.
Reference
[1]. Schwan W. R. (2011). Regulation of fim genes in uropathogenic Escherichia coli. World journal of clinical infectious diseases, 1(1), 17–25. https://doi.org/10.5495/wjcid.v1.i1.17
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BglII site found at 30
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]