Difference between revisions of "Part:BBa K3526006"

Revision as of 08:08, 27 October 2020

tac pro-atzR-T4 ter-PatzD-EGFP-T7 ter

Sequence and Features

The transcription factor atzR can sense the presence of cyanuric acid, and then regulate the promoter PatzD to start expressing EGFP protein, and finally emit green fluorescence.

Contribution

BBa_K3526006 is a composite part contains a special transcription factor AtzR and a special promoter PatzD. The transcription factor AtzR can sense the presence of cyanuric acid (CYA), and then regulate the promoter PatzD to start expressing GFP protein. As a result, at the presence of cyanuric acid, the engineering strain with BBa_K3526006 can emit green fluorescence.

Figure 1

Figure 2

Engineering Success

The cyanuric acid (CYA) was used for functional testing. After reading related articles, we choose 0μM, and 50μ as the detection concentrations of CYA. After preliminary analysis, we obtained Figure 3.

Figure 3

As seen in Figure 3, when the Pseudomonas putida is not transformed, under different concentrations of CYA, the GFP fluorescence value does not change significantly along with time. However, when part BBa_K3526006 is transformed, the GFP fluorescence value increases along with time when the concentration of CYA is 50μM. This can be explained as follow: as time goes on, more and more AtzR is transcribed. PatzD is activated when atzR combines CYA leading to more transcription of GFP. The results of the experiment show that with the presence of part BBa_K3526006,Pseudomonas putida KT2440 can detect cyanuric acid.

The results of the experiment have proven that by expression of BBa_K3526006, Pseudomonas putida KT2440 can effectively detect the presence of cyanuric acid (CYA) from concentrations 0μM to 50μM. It is reported that atrazine can be degraded into cyanuric acid via AtzA/AtzB/AtzC enzyme, and the detection of atrazine degradation can also be done. We imagine and design to conduct a composite part contains the coding sequence of the AtzA/AtzB/AtzC enzyme. Based on our results of BBa_K3526006, we can co-transform the new composite part and BBa_K3526006 into Pseudomonas putida KT2440. The new improved engineering strain can degrade atrazine and produce cyanuric acid, then the transcription factor AtzR can sense the cyanuric acid and regulate the PatzD promoter to express the GFP protein. As a result, we complete using the improved composite part to detect the presence of atrazine.