Part:BBa_K3269001:Experience

In order to validate that our part performs its intended function of providing a visual fluorescent output that is proportional to the UV dose given to the cell, we exposed E. coli K-12 cells transformed with our part (insert part number here) in a pSB1A3 backbone with our UV-C handlamp at 11.9 W/m^2 for increments of 0, 4, and 10 seconds (setup pictured in Figure 4). Negative (BBa_K3269003) and positive (BBa_K3269002) controls for fluorescence were also tested. Cells were inoculated in LB with ampicillin the night before and then diluted to an OD of 0.1 in M9 media the day of the experiment, and were then allowed to grow up to ~0.4. Directly after exposure in the 96-well plate, cells were then placed in a plate reader, which measured their fluorescence over a 3 hour period, taking Fluorescence and OD600 measurements every 3 minutes. Controls for our part were also exposed under the same conditions.

RESULTS
Our results suggest that there is no significant difference in induction at any of the UV doses for our part BBa_K3269001. This could possibly be because we only exposed cultures to UV transiently as opposed to continuously. In the future, we would design an experiment to allow for continuous UV exposure. Possible plasmid design improvements could include the addition of an Anderson promoter to recruit more transcription machinery, as well as a stronger RBS to raise levels of protein expression.

In summary, we were unable to induce significant expression of sfGFP from our plasmid.

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