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; Characterization of new series of ''OmpC'' propmoters
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<I>Tokyo Tech iGEM2010</I>
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[[Image:Tokyotech_ompc_graph.jpg|thumb|center|400px|Figure 1. Induction of new'' OmpC'' series in high osmolarity medium  Tokyo Tech iGEM2010]]
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In order to characterize P''ompC(C)'' [https://parts.igem.org/Part:BBa_K395301 BBa_395301], P''ompC(CB)'' [https://parts.igem.org/Part:BBa_K395302 BBa395302] and P''ompC(CS1)'' [https://parts.igem.org/Part:BBa_K395303 BBa_395303], each promoter was attached to GFP and its transcriptional activity was measured through the GFP expression. <br><br>
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P''ompC(C)''-GFP[https://parts.igem.org/Part:BBa_K395304 BBa_395304] , P''ompC(CB)''-GFP [https://parts.igem.org/Part:BBa_K395305 BBa_395305], P''ompC(CS1)''-GFP [https://parts.igem.org/Part:BBa_K395306 BBa_395306]and P''ompC(WT)''-GFP[https://parts.igem.org/Part:BBa_K395307 BBa_395307] on pSB3K3 was introduced into E. coli strain MG1655. A strain containing placI<sup>q</sup>-GFP, plasmid (BBa_J54202), a constitutive GFP expressive promoter and promoterless GFP reporter plasmid (BBa_J54103) were used as a positive control and negative control respectively. <br><br>
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Overnight cultures of reporter strains grown at 37 °C in Medium A containing appropriated antibiotics were diluted at least 1:100 in the medium and incubated at 37 °C as fresh cultures. After their OD<sub>590</sub> reached 0.2, the fresh culture was diluted 1 : 3 into 2 ml of pre-warmed medium A. For high osmolarity conditions, the cultures were diluted with sucrose supplemented medium to the final concentration of 15% (wt/vol). After 4 hours of induction, fluorescence intensity was measured with fluorometer. <br><br>
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After 4 hours of high osmolarity induction by sucrose, transcriptional activity of P''ompC(CB)''-GFP and P''ompC(CS1)''-GFP increased 2.5 folds and 2.3 folds respectively. However, significant amount of leaky expression was found in P''ompC(CS1)''-GFP without induction. In contrast, under the same conditions, we found no significant difference of GFP expression in P''ompC(C)''-GFP and P''ompC(WT)''-GFP. [http://2010.igem.org/Team:Tokyo_Tech/Project/wolf_coli/New_Series_of_PompC ...see more about P''ompC'' series]
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Revision as of 18:22, 26 October 2010

This experience page is provided so that any user may enter their experience using this part.
Please enter how you used this part and how it worked out.

Applications of BBa_R0082

User Reviews

UNIQ8ad2cb9a444d654b-partinfo-00000000-QINU

No review score entered. Edinburgh iGEM 2009

PompC characterization.jpg
We tested this promoter for use in our landmine-detection system. Our plan was to use this promoter together with a computationally designed TNT receptor and the hybrid Trz signal transduction protein, which has the EnvZ kinase domain, hence phosphorylates OmpR, activating this promoter, in the presence of TNT. To check that this promoter was working correctly, we attached it to GFP and assayed its activity in E. coli TOP10 cells as described on the Registry Measurement Page. (We also made a lacZ reporter version, BBa_K216010, so that we could do Miller assays as a backup, but at the time of writing we have not obtained good quantitative results from this). To induce the promoter, we used procaine, which activates the EnvZ kinase. Our results indicated that the promoter is activated by increasing levels of procaine from 0 to 15 mM, but there is very high basal activity under the conditions used, even in the absence of procaine. We also made an envZ mutant host strain using the KEIO collection of E. coli mutants, but at the time of writing, we have not yet repeated the tests using this host.

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UNIQ8ad2cb9a444d654b-partinfo-00000002-QINU


UNIQ8ad2cb9a444d654b-partinfo-00000003-QINU

Characterization of new series of OmpC propmoters

Tokyo Tech iGEM2010

Figure 1. Induction of new OmpC series in high osmolarity medium Tokyo Tech iGEM2010

In order to characterize PompC(C) BBa_395301, PompC(CB) BBa395302 and PompC(CS1) BBa_395303, each promoter was attached to GFP and its transcriptional activity was measured through the GFP expression.

PompC(C)-GFPBBa_395304 , PompC(CB)-GFP BBa_395305, PompC(CS1)-GFP BBa_395306and PompC(WT)-GFPBBa_395307 on pSB3K3 was introduced into E. coli strain MG1655. A strain containing placIq-GFP, plasmid (BBa_J54202), a constitutive GFP expressive promoter and promoterless GFP reporter plasmid (BBa_J54103) were used as a positive control and negative control respectively.

Overnight cultures of reporter strains grown at 37 °C in Medium A containing appropriated antibiotics were diluted at least 1:100 in the medium and incubated at 37 °C as fresh cultures. After their OD590 reached 0.2, the fresh culture was diluted 1 : 3 into 2 ml of pre-warmed medium A. For high osmolarity conditions, the cultures were diluted with sucrose supplemented medium to the final concentration of 15% (wt/vol). After 4 hours of induction, fluorescence intensity was measured with fluorometer.

After 4 hours of high osmolarity induction by sucrose, transcriptional activity of PompC(CB)-GFP and PompC(CS1)-GFP increased 2.5 folds and 2.3 folds respectively. However, significant amount of leaky expression was found in PompC(CS1)-GFP without induction. In contrast, under the same conditions, we found no significant difference of GFP expression in PompC(C)-GFP and PompC(WT)-GFP. [http://2010.igem.org/Team:Tokyo_Tech/Project/wolf_coli/New_Series_of_PompC ...see more about PompC series]

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UNIQ8ad2cb9a444d654b-partinfo-00000004-QINU