Part:BBa_K2033001:Design
C(12)-HSL Receiver Device - AubR
- 10INCOMPATIBLE WITH RFC[10]Illegal PstI site found at 395
- 12INCOMPATIBLE WITH RFC[12]Illegal PstI site found at 395
- 21COMPATIBLE WITH RFC[21]
- 23INCOMPATIBLE WITH RFC[23]Illegal PstI site found at 395
- 25INCOMPATIBLE WITH RFC[25]Illegal PstI site found at 395
Illegal AgeI site found at 205 - 1000INCOMPATIBLE WITH RFC[1000]Illegal BsaI site found at 184
Design Notes
Here is the inducible promoter sequence:
Stage 1-Insert Regulator ORFs
Phusion PCR
The AubR part was first synthesized by Ryan Muller in Spring of 2015. Stage 1 consisted of the insertion of the open reading frame into a cloning vector found here. The following reaction was conducted to amplify and fuse AubR with DNA plasmid.
| Reagent | Volume(uL) | Mix(x5) | Thermal Cycler Step | Step Temperature (°C) | Step Length (sec) | Step Repeats |
|---|---|---|---|---|---|---|
| DNA Plasmid | 1.0 | 5.0 | Initial Denaturation | 98 | 180 | 1x |
| 10uM F Primer | 1.0 | 5.0 | Denaturation | 98 | 10 | 35x |
| 10uM R Primer | 1.0 | 5.0 | Annealing | 66 | 30 | 35x |
| 10mM dNTPs | 1.0 | 5.0 | Elongation | 72 | 60 | 35x |
| Phusion Pol. | 0.5 | 2.5 | Elongation | 72 | 600 | 1x |
| 5x HF buffer | 10 | 50 | Cold Storage | 4 | ∞ | 1x |
| dH2O | 36 | 180 | ||||
| Total | 50.5 |
Digestion and Ligation
The PCR product and the cloning vector were digested with EcoRI and XbaI. These were gel verified and then combined in a 15uL ligation reaction (10 minutes at 37°C heat block). The reaction mixture is shown below:
| Reagent | Reaction Volume(uL) | Negative Ctrl. Volume(uL) |
|---|---|---|
| Insert DNA | 3.0 | 0.0 |
| Vector DNA | 3.5 | 3.5 |
| 2x Ign Buffer(Roche) | 7.5 | 7.5 |
| T4 Ligase(NEB) | 1.0 | 5.0 |
| dH2O | 0.0 | 3.0 |
| Total | 15 | 15 |
The ligation reaction was transformed with DH5α-turbo cells and plated for overnight growth. The Ampicillin plate produced 11 colonies of AubR, of which 2 were picked for further growth in liquid cultures. After mini-prepping the liquid cultures, a gel verification was performed. The two expected bands for the AubR-MRV vector complex should be around 3200bp and 860bp. The gel shown below indicates that the ligation was successful.
Stage 2-Insert Promoters
The AubR promoter sequences were ordered as g-blocks and digested with E/X and then de-phosphorylated. 20uL of digested DNA sequence was reacted with 1uL of phosphatase to remove phosphates from the sequence. The reaction was incubated at 37°C for 10 minutes and 75°C for 2 minutes to provide sufficient heat energy for the enzyme to work. The g-block promoter sequence was ligated to the AubR sequence via the following reaction:
| Part | Volume(uL) |
|---|---|
| Insert DNA (promoter) | 5.0 |
| Vector DNA | 0.2 |
| 10x FD Buffer | 2.0 |
| 10mM DTT | 1.0 |
| 10mM ATP | 1.0 |
| FD Bbsi/Bpil | 1.0 |
| T4 DNA Ligase | 1.0 |
| dH2O | 8.8 |
| Total | 20 |
The reaction mixture was first incubated at 37°C for 5 minutes and 23°C for 5 minutes. The reactions were then mini-prepped and gel verified using EcoRI and SpeI. After three trials, the following gel was produced.
The expected size of pAubR is 152 bp. This gel shows that pAubR was indeed the correct length and was to be inputted into the vector.
Stage 3-Create Viable Stock of AubR
The completion of the AubR part was completed by Rene Davis and Jiaqi Wu. A simple transformation was done into E. Coli BL21 strain, which was grown overnight and compared against a negative control. The AubR plate produced an ample amount of colonies (~50) while the negative control did not produce any. Colonies from this plate were picked and run under gel verification, which produced the image below:
With the confirmation from the gel verification (and further sequencing), the AubR part was successfully produced, and was used thoroughly in experiments conducted for this year's project.
Source
This HSL receiver was recovered from a metagenomic project on soil. The specific source is unknown.
References
(1) Nasuno, E., N. Kimura, M. J. Fujita, C. H. Nakatsu, Y. Kamagata, and S. Hanada. "Phylogenetically Novel LuxI/LuxR-Type Quorum Sensing Systems Isolated Using a Metagenomic Approach." Applied and Environmental Microbiology 78.22 (2012): 8067-074. Web