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Week 10

All out hard work and preparation in the last weeks came together this week and resulted in great success. Everything ran very smoothly due to our experience and knowledge gained in the lab. It is just as a wise man said 'Everything comes together in the final few weeks'. As a results we were successful in ligating BM and MB with the fluorescent reporters CFP and RFP. This will not only give us two new BioBricks to add to the registry but will also offer us the opportunity to characterise our hybrid promoters in accordance to their function and abilities.

Day 1 (10/09/12)

As backup, the running cultures of the Comparator circuit 1 and 2 transformed cells were mini-prepped. After nanodropping, the concentration were found to be:

C1-1a: 733.4 ng/µL

C1-2a: 1192.6ng/µL

C1-3a: 1596.9 ng/µL

C1-4a: 854.8 ng/µL

C2-1a: 896 ng/µL

C2-2a: 712.5 ng/µL

C2-3a: 1196.7 ng/µL

C2-4a: 811.9 ng/µL

Following this an overnight double restriction digest with EcoR1 and Pst1 was set up. These were set up using: 0.2µl BSA, 2µl Buffer H, 0.5µl EcoR1 and 0.5µl Pst1. As to the DNA, 1µg of DNA was added:

C1-1a: 1.36 µL

C1-2a: 0.84 µL

C1-3a: 0.62 µL

C1-4a: 1.17 µL

C2-1a: 1.12 µL

C2-2a: 1.40 µL

C2-3a: 0.84 µL

C2-4a: 1.23 µL

Following a low concentration reading on Friday, BM was miniprepped again. However, this produced no DNA when investigated. Therefore, BM was reinoculated into culture.

Restriction digest of CFP with Pst1 and Xba1 with the Promega 1kb ladder
Restriction digest of RFP with Pst1 and Xba1 with the Promega 1kb ladder

M-B samples were digested with SpeI and PstI to linearise the backbone in order to ligate a reporter (CFP, or RFP) into it. The desired DNA fragment was gel purified. At the same time, CFP and RFP were cut with PstI and XbaI and then gel purified to be ready for ligation to MB. The restriction digests involved 0.5µL of each enzyme, 2µL of Buffer B (SpeI and PstI)and Buffer H (PstI and XbaI) and 0.2µL of BSA. Again 1µg of DNA was used. The agarose gel in which the fragments were separated was of 1% w/v.

The DNA samples used were MB2, MB3,MB5,MB9,MB10. Following a successful ligation, the backbones containing the hybrid promoters were ready to be ligated either RFP or CFP. I preparation of constructing our Comparator circuit 1 and 2, the synthetic, complementary sequences were set up to be ligated in the iGEM backbone pSB1C3. All reactions were left overnight.

Day 2 (11/09/12)

The ligations (MB with CFP/RFP and Comparator Circuit 1 and 2 with pSB1C3) from the night before were run on a 1% w/v gel for an hour and the fragments cut out. The gel slices were then purified. The obtained DNA samples were then transformed into Bioline Alpha Select Gold Standard Competence cells. The plates that were being produced in the process were incubated at 37 degrees Celsius over night.

Samples of BM were miniprepped and nanodropped. The concentrations were found to all be lower than 45ng/L. Furthermore, the 260/230 readings were negative.

Day 3 (12/09/12)

A BM overnight culture was miniprepped by Russell and nanodropped. The concentration was found to be 199 ng/µL. The DNA was then digested with SpeI and PstI. Again 1µg of DNA, 0.5µL of each of SpeI and PstI, 0.2µL BSA and 2µL Buffer B were added to each digest. Following the incubation period, the sample were run on a 1% w/v agarose gel for an hour and the large fragment purified. I addition multiple overnight ligations were set up for BM1 and BM4 with RFP and CFP. It was made sure that the samples remained in the dark.

All the plates, which showed growth from the previous days experiments, were inoculated into 5ml LB cultures containing the relevant antibiotics. Furthermore, as back up, Comparator circuit 1 and 2 were transformed again and plated. These plates were grown overnight at 37 degrees Celsius.

Day 4 (13/09/12)

Inoculations were prepared of BM and MB2 to CFP and GFP. These were inoculated into several LB cultures with chloramphenicol added. We also transformed BM and incubated at 37 degrees Celsius over night.

Day 5 (14/09/12)

Samples of MB2 attached to RFP and CFP were transformed and plated. These plates were incubated over the weekend. We then re-inoculated samples of BM and MB2 ligated to CFP and RFP.