Part:BBa_K554010:Experience
This part was used to [http://2011.igem.org/Team:UNICAMP-EMSE_Brazil/Results#Device_2_testing:_SoxR.2FSoxS_system_regulating_GFP_production Device 2 testing: SoxR/SoxS system regulated GFP production]
Experimental results
In order to test the ability of Jedi Bacteria in sensing NO levels and activating genes linked to SoxS promoter, we built a Device testing, with GFP linked to SoxS promoter, as it is shown in the following schema (Figure 1):
The ability to recognize NO (nitric oxide), an inflammation signal molecule, was characterized for SoxR/SoxS sensor, and found to be FUNCTIONAL. In the section below we present the detailed results.
The NO is a product related to inflammatory response in vivo. To test the sensor in vitro, we used http://en.wikipedia.org/wiki/Paraquat Paraquat as inducer, a molecule which imposes superoxide stress within the cell in a similar manner as nitric oxide.
The experiment indicated that our sensor was capable of inducible production of GFP (or another protein controlled by the sensor). In addition, the protein induction can be modulated through varying the inducer concentration (as shown by Figure 2). Higher concentrations of Paraquat exhibited higher fluorescence levels, which indicates increased GFP concentrations.
The experimental concentrations of Paraquat did not show significant differences in cell growth as shown by OD levels in Figure 3. The [http://2009.igem.org/Team:Stanford/ProjectPage#Results_and_Analysis Stanford team (iGEM 2009)] showed that Paraquat can be toxic to E. coli cells, with growth inhibition at 60 – 80 µM.
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