Part:BBa_K818600
AmilGFP with sboA regulator
This is a coding construct for B. subtilis to produce AmilGFP pigment in response to rotten meat volatiles in the environment. AmilGFP is a yellow pigment designed by iGEM Uppsala 2011 and the regulator, sboA, is designed by iGEM Groningen 2012.
Usage and Biology
Expression in E. coli
SboA-AmilGFP is strongly expressed in E. coli, on plate and in liquid culture, at normal growth conditions. On plate, the yellow colour is less visible compared to the cell pellet in liquid culture.
Expression in B. subtilis
SboA-AmilGFP was shown to be very weakly expressed in Bacillus subtilis on LB plate (faint color formation after 2 days). This is probably due to the leakiness of the promoter.
We tested the expression of SboA-AmilGFP in B. subtilis subjected to volatiles from spoiled meat using the same setup as we used for the microarray.
First, we inoculated B. subtilisSboA-AmilGFP and B. subtilisWildtype from plate into flasks of Luria Broth: 1) Subjected to spoiled meat 2) Without meat We grew B. subtilis containing sboA-AmilGFP device in the setup overnight (16 hours) at 37 degrees Celsius. In the picture below, you can see the result: B. subtilisSboA-AmilGFP strain that was subjected to spoiled meat had turned bright greenish yellow (even visible in liquid LB culture), while the same strain that was grown without meat only showed very faint yellow color. Both B. subtilis wildtype in this setup did not express yellow color at all.
To check whether the difference in color was not the result of the promoter activation by the presence of meat in general, we also compared the growth of B. subtilis SboA-AmilGFP strain subjected to fresh meat and rotten meat. We grew the strain in Luria Broth in the microarray setup for 12 hours and measured OD (600 nm), Absorbance (395 nm) and assayed the color of the cells when pelleted. In the curves below you can see the results: while grown without meat volatiles and with fresh meat volatiles, our device strain still produces yellow color. The color was produced faster and in a larger amount when the device strain was subjected to volatiles from spoiling meat.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21INCOMPATIBLE WITH RFC[21]Illegal BglII site found at 207
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
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