To ensure our target genes were successfully cloned into the PSB1C3 backbone, we ran the electrophoresis of Taq PCR products to check the sizes of the insert genes.
Difference between revisions of "Team:NCTU Formosa/Wet Lab/Expression"
| Line 340: | Line 340: | ||
<th><p>Bacteriocin</p></th> | <th><p>Bacteriocin</p></th> | ||
<th><p>Mass (kDa)</p></th> | <th><p>Mass (kDa)</p></th> | ||
| + | <th><p>Mass of peptides with intein tag</p></th> | ||
</tr> | </tr> | ||
</thead> | </thead> | ||
<tbody> | <tbody> | ||
| + | <tr> | ||
| + | <td>Leucocyclicin Q</td> | ||
| + | <td>6.4</td> | ||
| + | <td>34.4</td> | ||
| + | </tr> | ||
<tr> | <tr> | ||
<td>Enterocin B</td> | <td>Enterocin B</td> | ||
<td>7.5</td> | <td>7.5</td> | ||
| − | + | <td>35.5</td> | |
| − | + | ||
| − | + | ||
| − | <td> | + | |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Bovicin HJ50</td> | <td>Bovicin HJ50</td> | ||
<td>6.25</td> | <td>6.25</td> | ||
| + | <td>34.25</td> | ||
</tr> | </tr> | ||
<tr> | <tr> | ||
| − | <td> | + | <td>Enterocin 96</td> |
| − | <td>7. | + | <td>7.9</td> |
| − | + | <td>35.9</td> | |
| − | + | ||
| − | + | ||
| − | <td> | + | |
</tr> | </tr> | ||
<tr> | <tr> | ||
<td>Lacticin Z</td> | <td>Lacticin Z</td> | ||
<td>5.9</td> | <td>5.9</td> | ||
| + | <td>33.9</td> | ||
| + | </tr> | ||
| + | <tr> | ||
| + | <td>Durancin TW-49M</td> | ||
| + | <td>7.3</td> | ||
| + | <td>35.3</td> | ||
</tr> | </tr> | ||
</tbody> | </tbody> | ||
Revision as of 15:04, 2 October 2018
Cloning
All of the sequences contained T7 promoter, RBS, bacteriocin, intein and CBD, were shown in Figure 1.
Figure 1: Our BioBrick design
After amplification with PCR, all the PCR products have their length around 1200 b.p. Each directly length is in the Table 1.
Bacteriocin |
Length |
Length of PCR product |
|---|---|---|
| Leucocyclicin Q | 186 b.p. | 1230 b.p. |
| Enterocin B | 210 b.p. | 1254 b.p. |
| Enterocin 96 | 219 b.p. | 1263 b.p. |
| Lacticin Z | 153 b.p. | 1197 b.p. |
| Enteriocin A | 192 b.p. | 1236 b.p. |
| Bovicin HJ50 | 171 b.p. | 1215 b.p. |
| Durancin TW-49M | 213 b.p. | 1257 b.p. |
| Subtilosin | 147 b.p. | 1291 b.p. |
Electrophoresis results of the PCR products with marker on the left side and target gene on the right side.
The length are labeled beside each band.
Figure 2: The electrophoresis results of Leucocyclicin Q, Enteroicin B, Bovicin HJ50 and Enterocin 96.
Figure 3: The electrophoresis results of Lacticin Z, Enteroicin A, Durancin and Subtilosin.
Protein Expression
After the expression from E. coli ER2566, we have to check whether the proteins are successfully expressed. We sonicate E. coli and run SDS-PAGE to make sure the correct sizes. The mass of each proteins are in Table 2.
Bacteriocin |
Mass (kDa) |
Mass of peptides with intein tag |
|---|---|---|
| Leucocyclicin Q | 6.4 | 34.4 |
| Enterocin B | 7.5 | 35.5 |
| Bovicin HJ50 | 6.25 | 34.25 |
| Enterocin 96 | 7.9 | 35.9 |
| Lacticin Z | 5.9 | 33.9 |
| Durancin TW-49M | 7.3 | 35.3 |
The gel of SDS-Page result are shown below. The mass of intein-CBD tag is 28 kDa, therefore, all the result shows the initial mass of each bacteriocin plus the mass of intein-CBD tag. From each SDS-Page result, we can confirm the production of target peptides.
Figure 4: SDS-PAGE result of Enterocin 96 and Enteroicin B.
(N1) Negative control: E. coli ER2566 without plasmid (N2) Negative control: E. coli ER2566 with empty plasmid
(A) Enterocin 96+intein+CBD (35.9kDa) (B) Enteroicin B+intein+CBD (35.5kDa)
Figure 5: SDS-PAGE result of Leucocyclicin Q and Durancin.
(N1) Negative control: E. coli ER2566 without plasmid (N2) Negative control: E. coli ER2566 with empty plasmid
(C) Leucocyclicin Q+intein+CBD (34.4kDa) (D) Durancin +intein+CBD (35.3kDa)
