Difference between revisions of "Part:BBa K1087003"

Revision as of 11:51, 26 October 2020

T7 promoter-B0034-amilCP-teminator

This is a strong reporter amilcp with a T7 promoter. When you use T7 polymerase & T7 promoter to control the expression of desired genes,you can ues this reporter since it can be seen by naked eyes in high copy plasmid. Reference BBa_K592025

CSMU_Taiwan 2020 Improve

Group: CSMU iGEM 2020
Author: Huan-Jui Chang, Cheng-Ruei Yang, Hung-Yu Chen

Introduction

This year, CSMU wants to solve the problems revolving around diagnosing oral cancer, and we decided to use toehold switches as our detection device. Toehold switches are composed of 3 main parts: trigger binding site, ribosome binding site, and a reporter gene. We wanted to find the most suitable reporter gene which can be measured with ease. Therefore, we had tried different kinds of reporter genes. Including mRFP which has been mentioned in our contribution, invertase which is our new part. We also had tried amilCP, which is a blue chromoprotein that is visible to the naked eye. With our improvement, amilCP's expression can be controlled, just like adding an on and off switch. AmilCP would not be expressed without a specific trigger under the regulation of toehold switches. By doing so, it could turn out to be a useful diagnostic tool.

Method

We followed the protocol we created. We expressed three of them, this part, the toehold switch with the trigger, and the toehold switch without the trigger in vitro environment, using the cell-free PURExpress protein synthesis kits and incubating them for six hours at 37°C.

Results
This is the graph that focuses at the sixth hour. It shows the results of our experiments with the existing part and the improved part. The vertical axis shows the relative absorbing wavelength at 588 mm. And the horizontal axis represents the name of the three. The yellow bar represents the original part, and the two bars on the right represent the improved part. The blue one refers to the condition without trigger, while the green one refers to the condition with the trigger. The expression of our improved part is lower than the original ones. However, comparing the green one and the blue one, the green one expressed better. The on/ off ratio is 1.44, which was much higher than 1. Representing that there were significant differences between the ON state and the OFF state. The result proved that amilCP with toehold switches could only be triggered by a specific sequence, which also means the amilCP expression is lower in the absence of the trigger.

Reference Section

1. Alieva, N. O., Konzen, K. A., Field, S. F., Meleshkevitch, E. A., Hunt, M. E., Beltran-Ramirez, V., Miller, D. J., Wiedenmann, J., Salih, A., & Matz, M. V. (2008). Diversity and evolution of coral fluorescent proteins. PloS one, 3(7), e2680. https://doi.org/10.1371/journal.pone.0002680

2. Part: BBa_K1087003: https://parts.igem.org/Part:BBa_K1087003

3. Part:BBa_K592025: https://parts.igem.org/Part:BBa_K592025

4. Pardee, K., Green, A. A., Takahashi, M. K., Braff, D., Lambert, G., Lee, J. W., Ferrante, T., Ma, D., Donghia, N., Fan, M., Daringer, N. M., Bosch, I., Dudley, D. M., O'Connor, D. H., Gehrke, L., & Collins, J. J. (2016). Rapid, Low-Cost Detection of Zika Virus Using Programmable Biomolecular Components. Cell, 165(5), 1255–1266. https://doi.org/10.1016/j.cell.2016.04.059</p>

Sequence and Features