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Team:OUC-China/Notebook Protocols
From 2014.igem.org
Molecular Tests
I Electroporation
A. Prepare appropriative competent cells E.coil BL21 for electroporation.
1.Inoculate E.coli BL21 with 100ml fresh Luria-Bertani medium Shaking culture to OD600 ： 0.5 to 1.0.
2.Put the mixture into 2 of 50ml centrifugal tube and store on ice for 15 min.
3.Centrifugation at 5000×g, 4℃ for 15min, discard the supernatant.
4.Resuspend the mixture by 33ml ultrapure water (ice-bath). Centrifuge at 5000×g, 4℃ for 15min, discard the supernatant.
5.Repeat step 4 for 2 times.
6.Resuspend the mixture by 20ml 10% sterile glycerol (ice-bath). centrifuge at 5000×g, 4℃ for 15min, discard the supernatant.
7.Resuspend the mixture with 1ml 10% sterile glycerol (ice-bath).
8.Subpackage the competent cells (100μl) into EP tube and store them at -80℃.
B. Electroporation
1.Put the competent cells E.coil BL21 on ice for 15min. put plasmid RP4 and interfere DNA on ice before use.
2.Mix 5μl RP4 and 5μl interference DNA with each tube of competent cells. And suck up them into cuvette (ice-bath).
3.Electroporation:5ms impulse wave (200Ω, 25μ Fd, the voltage was 2.1 kV)
4.Add 1ml SOC medium into the cuvette.
5.Culture the mixture with Luria-Bertani medium, 37℃ for 1h.
6.Plate the mixture on LB solid medium, 34μg/ml Chloramphenicol added. Static culture at 37℃ for 12h~14h.
