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Team:Evry/Notebook/w6
From 2013.igem.org
Week 6: 22nd July -th 28th July
Monday, July 22nd
We did a PCR on the seven products of golden gate 1 using the VR and VF2 primers. We mixed :
- 10 uL of One Taq Buffer 10X
- 1 uL of 10 mM dNTPs
- 1 uL of each VF2 and VR primers
- 35,5 uL of H2O
- 1 uL of the One Taq enzyme
- 1 uL of the golden gate products
We used the following PCR program :
- 95°C for 3 min
- 95°C for 15 sec
- 55°C for 30 sec
- 68°C for 2 min
- 68°C for 10 min
Note: We repeated step 2, 3 and 4 29 times.
The gel migration didn't reveal any band. We supposed that it didn't work due to the annealing temperature we used. Indeed, with the help of the Tm Calculator website, we found that the optimal annealing temperature for those primers was 53°C.
Tuesday, July 23rd
In order to test the best annealing temperature for our following PCRs, we did a PCR on our 5 first golden gate products with two different annealing temperature : 53 or 51°C. We also prepared two positiv controls for each conditions with either bacteria transformed by empty PSB1A3 plasmid or 1 uL of the miniprep plasmid. This was realised in order to verify if the problem of our first PCR was due to a bad lysis of our bacteria. What is more, we prepared one negativ control with an annealing temperature of 55°C.
(Mettre photo gel)According to our results, we can assume that our first PCR was badly realised due to a handling error and not because of the annealing temperature we used.
In the meantime, we did the Golden Gate 1 again in order to obtain better ligation results. We transformed TOP 10 E. coli with the golden gate products and plated them on LB-Agar with carbenicillin antibiotic. The petri dishes have been let overnight at 37°C.
Wednesday, July 24th
We did a colony PCR
