Team:PKU Beijing/Project/AND Gate 2 Result

Project > AND Gate 2 > Result

Sequence of the Mutated PhiR73 delta
After mutation, we send DNA for sequence to see whether TAG amber mutation is successfully introduced in the PhiR73 delta coding sequence. The following are the alignment of the original sequence and the singal mutated and double mutated sequence. It is shown that the sites are successfully mutated to TAG so that the mRNA is not functional without SupD tRNA.

Rescuing PhiR73 Translation by supD
In our project, the second AND Gate is directly coupled to our Bistable system, by using a CI434 repressible, CI inducible promoter that is the same as the promoter upstream of CI in the Bistable module. This step is planned in the final assembly of the whole system. Before this, we use two inducible promoters to control PhiR73 with amber mutation and supD tRNA. PhiR73 with an amber mutation is placed downstream of the salicylate sensor promoter and the supD tRNA is placed under the arabinose sensor.

Fig1. shows the testing result of the second AND Gate (singal mutation).

Although fluorescence can also be observed in the presence of salicylate. We don't care about it because the rbs is not adjusted, as we have experienced in the construction of the first AND Gate, the adjustment do make a difference.

We also have the a control AND Gate with the sequence unmutated, it is observed that even without induction, there is basal fluorescence because of the leakage of PhiR73 activator. The mutated one shows almost no basal (Data not shown). Fig2 shows the strength of flourescece of uninduced, singal induced and double induced E.coli.