Protocol
This is our Modeling DesignCloning
PCR
Reaction system:
1.
\(H_2 O\ \ 2\mu L\)
\(10\mathrm{x}\ \ Taq \ \ buffer \ \ 5\mu\mathrm{L}\)
\(2.5mM \ \ dNTP \ \ 1\mu\mathrm{L}\)
\(R+F-Primer \ \ 10\mu\mathrm{L}\)
\(Template \ \ 10\mu\mathrm{L}\)
\(Taq \ \ 2.5\mu\mathrm{L}\)
\(Universal \ \ DNA \ \ polymerase \ \ TransGen\)
2.
\(H_2 O\ \ 20\mu\mathrm{L}\)
\(5\mathrm{x}\ \ Taq\ \ buffer\ \ 10\mu\mathrm{L}\)
\(2.5mM\ \ dNTP\ \ 5\mu\mathrm{L}\)
\(R+F-Primer\ \ 44\mu\mathrm{L}\)
\(Template\ \ 10\mu\mathrm{L}\)
\(Taq\ \ 1\mu\mathrm{L}\)
3.
\(primeSTAR\ \ from\ \ Takara\)
\(H_2 O\ \ 21\mu\mathrm{L}\)
\(2\mathrm{x}\ \ primeSTAR\ \ 25m\mathrm{L}\)
\(R+F-Primer\ \ 2\mu\mathrm{L}\)
\(Template\ \ 2\mu\mathrm{L}\)
Process:
98°C 2min
\( \begin{equation} \left. \begin{array}{lcl} {98°C\ 10s} \\ {56°C\ 15s} \\{72°C\ 30s} \end{array} \right \} Cycle\ 35 \end{equation} \)
72°C 5min
4°C ---
98°C 2min
\(\begin{equation}\left. \begin{array}{lcl} {98°C\ 10s} \\ {55°C\ 5s} \\{72°C\ 8s} \end{array} \right\}Cycle\ 35\end{equation}\)
72°C 5min
15°C ---
Fusion PCR：
- basic PCR
- using the PCR product of step 1 as template does PCR
- using the PCR product of step 2 as template does PCR，but first five cycles don’t add primer, after first five cycles, the sixth cycle adds primer and continue PCR.
The system of step 2:
\(H_2 O\ \ 21\mu\mathrm{L}\)
\(2\mathrm{x}\ \ primeSTAR\ \ 25m\mathrm{L}\)
\(R+F-Primer\ \ 2\mu\mathrm{L}\)
\(Template①\ \ 1\mu\mathrm{L}\)
\(Template②\ \ 1\mu\mathrm{L}\)
Electrophoresis---Gel Purification
Material:
Agarose gel: 1% agarose dissolved in 1 x TAE + gelstain
Protocol:
We used gelstain to stain the DNA and imaged it in a Transilluminator.
We used the gel extraction kit to get the objective fragment.
We used the DNA fragment purification kit to get the objective fragment.
Digestion
| \(50\mu\mathrm{L} \ \ \mathrm{reaction \ \ system}\) | |||||
|---|---|---|---|---|---|
| Reagent | 10x \(\ \mathrm{H \ buffer}\) | \(Eco\mathrm{R}\ \mathrm{I}\) | \(Pat\ \mathrm{I}\) | \(\mathrm{Plasmid}\) | \(\mathrm{H_2 O}\) |
| Dosage | \(5\mu\mathrm{L}\) | \(1.5\mu\mathrm{L}\) | \(1.5\mu\mathrm{L}\) | \(15\mu\mathrm{L}\) | \(27\mu\mathrm{L}\) |
| \(10\mu\mathrm{L} \ \ \mathrm{reaction \ \ system}\) | |||||
| Reagent | 10x \(\ \mathrm{H \ buffer}\) | \(Eco\mathrm{R}\ \mathrm{I}\) | \(Pat\ \mathrm{I}\) | \(\mathrm{Plasmid}\) | \(\mathrm{H_2 O}\) |
| Dosage | \(1\mu\mathrm{L}\) | \(0.3\mu\mathrm{L}\) | \(0.3\mu\mathrm{L}\) | \(3\mu\mathrm{L}\) | \(5.4\mu\mathrm{L}\) |
Ligation
| Ligation reaction system | ||||
|---|---|---|---|---|
| Reagent | DNA | Plasmid | T4 buffer | T4 ligase |
| Dosage | \(7\mu\mathrm{L}\) | \(1\mu\mathrm{L}\) | \(1\mu\mathrm{L}\) | \(1\mu\mathrm{L}\) |
LR reaction
1. Entry linearization
β2-TOPO（plasmid concentration 117ng/μL） NotI 37°C enzyme digestion for the night
| 50μL Single enzyme system | |
|---|---|
| 10x BufferH | 5μL |
| DNA | 20μL |
| ddH2O | 12.5μL |
| Enzyme | 2.5μL |
| 0.1%BSA | 5μL |
| 0.1%Triton X-100 | 5μL |
2. LR system (\(4\mu\mathrm{L}\)):
100 ng/ul linear Entry: 0.5 ul
destination vector: 1 ul (pCambia1300-nluc / pCambia1300-cluceach one)
LR Clonase II enzyme mix: 1 ul
ddH2O: 0.5 ul
mix slightly，water base for 5 h at 25°C
transform, 4 ul, reactant transform 50 ul competent cells
Transformation
Material:
| LB liquid medium | |||
|---|---|---|---|
| Reagent | Tryptone | Yeast extract powder | NaCl |
| Reagent | 10 g/L | 5 g/L | 10 μL |
Protocol:
preparation of the competent cells
1μL ligation product + 50μL cells
Heatshock of Trans5α(42°C,45s)
Put on ice(2min)
Add 500μL LB media and incubate for 1h(37°C, 150rpm)
Centrifuge at 4000rpm for 1min and remove 400μL supernatant
Resuspend the pellets using the left supernatant
Spread plates(with Kan;CHL)
Incubate for 12~16h(37°C)
Protein Expression
- Inoculated 3 mL LB media including relevant antibiotics with the monoclonal colony of expression plasmid, incubate for 12~16h(37°C, 190rpm)
- Inoculated 100 mL TM expression media including relevant antibiotics with the 1mL bacteria liquid, incubate for 3h(37°C, 250rpm,OD600=0.6~0.8)
- Add IPTG into it until its final concentration is 1mmol/L, incubate for 4~6h(37°C, 250rpm)
- Centrifuge at 6000rpm for 10min and remove supernatant
- Gather sediment, cryopreserve at -20°C
Material:
TM expression medium:1000mL PH=7.4
| Reagent | tryptone | Yeast extract powder | NaCl | glucose | glycerol |
| Dosage | 1.2g | 2.4g | 1.0g | 1.0g | 0.6mL |
