Difference between revisions of "Part:BBa Q04510"
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| − | We constructed “P<sub>Bad/araC</sub>-RBS-EYFP-pSB1C3” and “P<sub>Bad/araC</sub>-Inverter-RBS-EYFP-pSB1C3” in ''E.coli'' BL21（DE3）to characterize its function. | + | We constructed “P<sub>Bad/araC</sub>-RBS-EYFP-pSB1C3”(<partinfo>BBa_K3332082</partinfo>) and “P<sub>Bad/araC</sub>-Inverter-RBS-EYFP-pSB1C3”(<partinfo>BBa_K3332079</partinfo>) in ''E.coli'' BL21（DE3）to characterize its function. |
For the latter circuit, cI repressor will not express in the absence of arabinose so that the fluorescence of EYFP can be observed. At the certain concentration of arabinose, PBad/araC can be activated to express cI repressor to inhibit the pR promoter，so the fluorescence of EYFP decreases. | For the latter circuit, cI repressor will not express in the absence of arabinose so that the fluorescence of EYFP can be observed. At the certain concentration of arabinose, PBad/araC can be activated to express cI repressor to inhibit the pR promoter，so the fluorescence of EYFP decreases. | ||
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| − | :'''Fig.2''' The results of Fluorescence Intensity/OD.Yellow represents P<sub>Bad/araC</sub>, green represents P<sub>Bad/araC</sub>-EYFP, and purple represents P<sub>Bad/araC</sub> -Inverter-EYFP. | + | :'''Fig.2''' The results of Fluorescence Intensity/OD.Yellow represents P<sub>Bad/araC</sub>, green represents P<sub>Bad/araC</sub>-EYFP(<partinfo>BBa_K3332082</partinfo>) , and purple represents P<sub>Bad/araC</sub> -Inverter-EYFP(<partinfo>BBa_K3332079</partinfo>) . |
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| + | <h1><b>Contribution From CUG-China 2024</b></h1> | ||
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| + | Inverter is mainly composed of cI repressor from <i>E. coli</i> phage lambda and <i>P<sub>R</sub></i> promoter which is inhibited by <i>cI</i> repressor. It can reverse the inducer action of the upstream promoter. It was registered in 2003. | ||
| + | In our project, we expect engineered bacteria to survive and carry out biomining activities only in environments containing gold, so we constructed bacterial suicide switches using tandem gene wiring of gold combined with specific transcription factors, Inverter and <i>mazF</i>. | ||
| + | <center><img src="https://static.igem.wiki/teams/5323/parts/c5.png" width="50%" alt=""> </center> | ||
| + | <center>Fig 5. The gene circuit of expression vector “pYDT-<i>golS</i>-<i>P<sub>gol</sub></i>-<i>cI</i>-<i>P<sub>R</sub></i>-<i>mazF</i>” </center> | ||
| + | In order to quantify the function of inverter and the toxicity of <i>mazF</i>, We designed gene circuits to express inverter and <i>mazF</i> by induction of inducers and reflected the toxicity of MazF to cells by measuring OD<sub>600</sub>. | ||
| + | <center><img src="https://static.igem.wiki/teams/5323/parts/c6.png" width="50%" alt=""> | ||
| + | <center>Fig 6. Growth profiles of the engineered bacterium <i>E. coli</i> BL21 in the presence of both inducer </center> | ||
| + | IPTG and Au[III], only inducer IPTG or Au[III], and no inducer IPTG and Au[III].</center> | ||
| + | In the presence of both Au[III] and the inducer IPTG, the engineered strains grew normally. Whereas, when only Au[III] or inducer IPTG was present and when neither Au[III] nor inducer IPTG was added, the bacteria expressed the toxic protein MazF resulting in failure to grow normally. The effective operation of the suicide module was demonstrated. | ||
Latest revision as of 10:52, 1 October 2024
QPI (B0034.C0051.B0015.R0051)
Lambda cI QPI w/ strong RBS
Usage and Biology
Preliminary data indicates that this inverter functions well. [jb, 5/24/04]
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
USTC_2009's MEASUREMENT
ECUST_China 2019 characterization
In ECUST_China 2019 characterization, we added the Plac before the CⅠgene and used mRFP as the reporter gene to measure the effectiveness of this part. In the absence of IPTG, CⅠP was constitutively expressed so that the RFP fluorescence could be observed. However, as the concentration of IPTG increasing, Plac was activated to express CⅠprotein which inhibited the transcription of CⅠP ，so the fluorescence of mRFP decreased.
Contribution
Group: iGEM Team XMU-China 2020
Author: Shi Zhang
Summary: fluorescence / OD600
Quantitative Characterization from iGEM20-XMU-China
Inverter is mainly composed of cI repressor from E. coli phage lambda and pR promoter which is inhibited by cI repressor. It can reverse the inducer action of the upstream promoter. It was registered in 2003.
- Fig.1 Genetic circuits of Inverter.
We constructed “PBad/araC-RBS-EYFP-pSB1C3”(BBa_K3332082) and “PBad/araC-Inverter-RBS-EYFP-pSB1C3”(BBa_K3332079) in E.coli BL21（DE3）to characterize its function.
For the latter circuit, cI repressor will not express in the absence of arabinose so that the fluorescence of EYFP can be observed. At the certain concentration of arabinose, PBad/araC can be activated to express cI repressor to inhibit the pR promoter，so the fluorescence of EYFP decreases.
The fluorescence/OD600 values of these two circuits were measured with or without arabinose and compared with “PBad/araC-pSB1C3” in E.coli BL21(DE3). We discovered that the downstream gene of proBAD/araC can be expressed in the presence of arabinose and decrease expression without arabinose. When the inverter is added to the circuit, the effect is reversed. The result proves that inverter can function correctly and reverse the effect of PBad/araC.
- Fig.2 The results of Fluorescence Intensity/OD.Yellow represents PBad/araC, green represents PBad/araC-EYFP(BBa_K3332082) , and purple represents PBad/araC -Inverter-EYFP(BBa_K3332079) .
Contribution From CUG-China 2024
Inverter is mainly composed of cI repressor from E. coli phage lambda and PR promoter which is inhibited by cI repressor. It can reverse the inducer action of the upstream promoter. It was registered in 2003. In our project, we expect engineered bacteria to survive and carry out biomining activities only in environments containing gold, so we constructed bacterial suicide switches using tandem gene wiring of gold combined with specific transcription factors, Inverter and mazF.
