Difference between revisions of "Team:Nanjing-China/Results"

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             <td><p><font size="-1">c)</font></p><img src="https://static.igem.org/mediawiki/2017/b/bc/T-Nanjing-China-h2s-9.png" width="400" /><p><font size="-1"></p></p></td>
 
             <td><p><font size="-1">c)</font></p><img src="https://static.igem.org/mediawiki/2017/b/bc/T-Nanjing-China-h2s-9.png" width="400" /><p><font size="-1"></p></p></td>
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             <td><p><font size="-1">a)RFP responsiveness of the detector system.<br />
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             <td><p><font size="-1">Figure  2.a)RFP responsiveness of the detector system.<br />
 
             b) A visible photograph of a).<br />
 
             b) A visible photograph of a).<br />
 
             c) Test of selectivity.</font></p></td>
 
             c) Test of selectivity.</font></p></td>

Revision as of 04:22, 28 October 2017

Team:Nanjing-China - 2017.igem.org

Results

In the part of lab work, we have designed three biosensor sequence and improved an old part, J23000. What's more, all the three design have been demonstrate by us.

We have designed a formaldehyde sensor sequence, which is a part of our team .

The sequence is composed of PfrmR, gene frmR, flag tag, PfrmAB, gene RFP.

When the pathway works, we can see that the E.coli turns to red with naked eyes at the presence of formaldehyde.

In order to demonstrate the design, a lot of experiments have been done.

Figure 3. Influence of Formaldehyde Induce Time on Fluorescence Expression

Figure4.A photograph of E.coli cells containing the formaldehyde-induced RFP expression plasmid, or without formaldehyde induction, and re-suspended in PBS buffer(pH7.4)

Figure5.Fluorescence measurement of E.coli cells containing the formaldehyde-induced RFP expression plasmid after gradient concentrations of formaldehyde induction and re-suspended in PBS buffer(pH7.4)
It is worth to be mentioned that the team OUC help us demonstrate the result.

As to the hydrogen sulfide sensor, we also designed a whole-cell biocatalytic system, displaying the concentration of hydrogen sulfide by the compound’s influence on specific genes’ expression in modified E.coli. 

In our design, we use red fluorescent protein as the indicator.When hydrogen sulfide exits, the gene transcription is activated, and the bacteria turns red.
In the experiment, we proved that the sequence worked well and was useful to detect hydrogen sulfide

Figure1.Whole-cell sequence dual-enzyme digestion

a)

b)

c)

Figure 2.a)RFP responsiveness of the detector system.
b) A visible photograph of a).
c) Test of selectivity.

There is a composite of hydrogen sensor full length sequence.

The order of the elements is: HoxA-HoxB-HoxC-HoxJ-terminator-HoxP-EGFP. The sequence of HoxABCJP comes from Ralstonia eutropha H16 megaplasmid pHG1. The hole sequence acts as an hydrogen sensor.

When the amount of hydrogen goes to a higher level, Fluorescence intensity increases apparently.

The sequence was a good detecter in the lab work.

Figure1. Coomassie Brilliant Blue R-250-stained SDS-Page analysis of recombinant E.coli expressing hoxABCJ-terminator-hoxp-gfp

Fingure 2. Western blot analysis of recombinant E.coli expressing his-hoxA

Fluorescence intensity remains stationary when IPTG is added.
And Fluorescence intensity increases in a low hydrogen atmosphere.
When the amount of hydrogen goes to a higher level Fluorescence intensity increases apparently. meaning the designed reporter pathway have worked.

Figure 3. Influence of H2 concentration on fluorescence expression

Address

Life Science Department
#163 Xianlin Blvd, Qixia District
Nanjing University
Nanjing, Jiangsu Province
P.R. of China
Zip: 210046

Email

nanjing_china@163.com

Social media

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iGEM Nanjing-China@nanjing_china