The PCR with 5' phosphorylated TG_2xGSSG FP und TG_2xGSSG RP should generate the 7545 bp fragment for ligation from the methylated template PheA-Arc1p-C-8x-pET28a from 14.5.
The used Primer concentration was 1
µM, the concentration of the template was 1 ng/µL and we used a hot start to avoid unspecific annealing of primers.
Content |
Volume [µL] |
Water |
29.5 |
5x GC Buffer |
10 |
DMSO |
2.5 |
TG_2xGSSG FP |
2.5 |
TG_2xGSSG RP |
2.5 |
PheA-Arc1p-C-8x-pET28a |
1 |
dNTPs |
1 |
Phusion-Polymerase |
1 |
Total Volume |
50 |
Step |
Temperature [°C] |
Time [min:sec] |
1 |
98 |
2:00 |
2 |
add Polymerase |
|
3 |
98 |
0:10 |
4 |
67.5 |
0:30 |
5 |
72 |
4:00 |
6 |
go to 3 |
32x |
7 |
72 |
10:00 |
8 |
4 |
hold |
The amplified fragment was purified on an agarose gel on which it showed the correct size. The extracted linear template was then digested to degrade the original unmutated plasmid using DpnI.
Content |
Volume [µL] |
10x CutSmart Buffer |
3.6 |
Plasmid |
30 |
DpnI |
3 |
Total Volume |
36.6 |
The reaction mixture was incubated at 37 °C and 300 rpm for 1 h and afterwards heated to 80 °C for 20 min
In order to create the circular plasmid 100 ng of the linear template were mixed with 1 µL 10x T4-Ligasebuffer, 1 µL T4-Ligase and water to give a total volume of 10 µL. This mixture was incubated for 9 h at 16 °C. The resulting plasmid was dialysed with water to decrease the salt concentration for the following transformation of E. coli Top10 electrocompetent cells with the plasmid.