Team:Elan Vital Korea/Notebook
4/28/15
We received the DNA distribution kit from iGEM, and in order to amplify our amount of DNA, we transformed the DNA in competent cells, using the following LB growth medium.
1. Solid Medium
| Trypton | 2g |
|---|---|
| Sodium chloride | 2g |
| Yeast | 1g |
| BactoAgar | 3g |
*D.W 200ml standard
2. Liquid Medium
| Trypton | 2g |
|---|---|
| Sodium chloride | 2g |
| Yeast | 1g |
*D.W 200ml standard
Because we needed to add antibiotics, we created a stock solution, with a concentration of 34mg/ml, diluted by 1000 times. When the growth medium cooled, we put in antibiotics.
Next, we marked the plasmids that we wanted to use from the DNA distribution kit.
Then we added 10ul of distilled water to each plasmid, and stirred well, which caused the plasmid to turn red. We left the mixture to lay for 5 minutes.
These were the plasmids we had selected:
| BBa J23100 | 17D plate 4 (ampicillin) |
|---|---|
| BBa B0030 | 4G plate 4 |
| BBa C0062 | 4L plate 2 |
| BBa B0024 | 1D plate 4 |
| BBa R0062 | 6H plate 2 |
| BBa E0040 | 13L plate 4 (ampicillin) |
| BBa B0015 | 3F plate 3 |
| BBa C0060 | 4H plate 2 |
| BBa I732006 | 3B plate 3 |
Next, we prepared the transformation of the plasmids into competent cells. Since the cells had been stored at 70°C, we had to leave them out previous to the experiment to let them thaw, along with the S.O.C medium.
First, we added 3ul of DNA to the cells, and shook the mixture (pipetting didn’t do the job). After leaving the mixture on ice for 30 minutes, we heatshocked it at 42°C, for 30 seconds. Then, we left it on ice again for two minutes.
After that, we added 250ul of a prewarmed S.O.C medium, and left the mixture in a shaking incubator at 37°C and 225rpm for an hour. We then spread the mixture onto an LB plate, and allowed it to incubate overnight, for 16 hours.
4/29/15
The previous results were divided, as B0030, C0062, R0062, I732006, B0015 formed observable colonies, while J23100, B0024, C0060, E0040 did not. Thus, we decided to re-spread these four onto another LB plate.
Successful Results:
4/30/15
We retransformed J23100, B0024, C0060, and E0040, and spread them onto a growth medium with ampicillin.
5/1/15
As of May 1>st C0060, E0040 colony were additionally verified, while B0024, J23100 still continued to not show any sign of colony growth. We decided to run a miniprep with the successful colonies B0030, C0062, R0062, I732006, B0015, C0060, and E0040, and thus left them in a 5ml liquid growth medium each.
Successful Results:
5/2/15
We ran the miniprep, which was unsuccessful as the resulting amount of DNA was too small to work with.
5/4/15
Two weeks after receiving the DNA distribution kit from iGEM, we got the plasmids we needed to work with two weeks later, in bacterial cells.
5/6/15
We used the successful colonies to run our experiments. We transformed B0024 into a competent cell and spread it onto an ampicillin growth medium. We streaked bacteria containing J23100 and I732073. We also prepared C0060 and B0030 for a miniprep, and put them each in a 5ml liquid growth medium.
5/7/15
We looked at the results of the procedures of the day before, and while B0024 had no observable colony growth, J23100 and I732073 did. Then, we ran a miniprep on C0060 and B0030, which we had prepared for 18 hours the day before.
5/10/15
The team made the decision to change the plasmids we were working with, opting for the J37032 plasmid, a LuxRresponsive GFP, in order to save time. We also changed our terminator to the K823017 plasmid. B0024 was supposed to be our bidirectional terminator, but because it couldn’t produce enough DNA, we had to find another plasmid to replace it.
Here is the complete list of plasmids we are using:
| constitutive promoter | J23100 | ampicillin |
|---|---|---|
| RBS | B0030 | chloramphenicol |
| LuxR | C0062 | ampicillin |
| terminator | K823017 | chloramphenicol |
| LuxRresponsive GFP | J37032 | chloramphenicol |
| terminator | B0015 | chloramphenicol |
| AiiA | C0060 | chloramphenicol |
1. LuxR
C0062 (vector) : EcoRI XbaI
B0030, J23100 (fragment) : EcoRI SpeI
2. GFP
J37032
3. LuxRGFP
K823017 (fragment) : EcoRI SpeI
promoter RBSLuxR (vector) : EcoRI XbaI
J37032 (fragment) : EcoRI SpeI
4. Test
C0060 (vector) : EcoRI XbaII
B0030, J23100 (fragment) : EcoRI SpeI
5/11/15
We decided to make 1% concentration agarose gel, using 0.7 grams of Seakem LE Agarose, 0.3 grams of Nusieye GTG agarose, and 100 mililliters of 1xTBE buffer. After putting all the mentioned ingredients into a flask, we put wrap over the entrance, and microwaved for two minutes, melting it entirely. Then we solidified the agarose by pouring it into a mold. Out of the DNA kit, we also transformed K823017 and J37032 into competent cells.
5/11/15
We verified the transformations from the day before, and both the K823017 and the J37032 colony were successful.
5/13/15~5/19/15
In order to increase the amount of plasmids of B0015, B0030, J37032, K823017, C0060, C0062, I732073, and J23100, we did minipreps and midipreps, which left us with more viable DNA to work with.
5/20/15
To verify whether the plasmids we’ve created were relevant to our experiment, we cut them using a restriction enzyme.
These were the plasmids we used: B0015, B0030, J37032, K823017, C0060, C0062, I732073, J23100
The results (depending on the enzyme used, highlighted in bold):.
| DNA of each | 1uL |
|---|---|
| XbaI/PstI | 2uL |
| Buffer | 2uL |
| Distilled Water | 15uL |
| Total | 20uL |
XbaI (8) ↰↱ PstI (8)
This was the order of the gel electrophoresis markers:
(2.19kb, 2.2kb, 2.08kb, 3.0kb, 2.88kb, 2.85kb, 5.1kb, 2.1kb)
B0015, K823017, B0030, J37032, C0060, C0062, I732073, J23100 / XbaI
B0015, K823017, B0030, J37032, C0060, C0062, I732073, J23100 / PstI
C0062 and J23100 had larger sizes than were expected.
5/29/15
Due to our electrophoresis results being incorrect, in order to verify the existence of fragments we had to do a double digestion procedure, cutting B0015, K823017, B0030, J37032, C0060, I732073, J23100 with EcoRI and XbaI.
| DNA of each | 2uL |
|---|---|
| EcoRI | 1uL |
| PstI | 1uL |
| Buffer | 2uL |
| Distilled Water | 14uL |
| Total | 20uL |
Because of C0062 being far too big in the electrophoresis results, we redid the miniprep.
Since we got two types of C0062 from the iGEM kit, one that grows in an ampicillin medium and one that grows in a chloramphenicol medium. We decided to do a miniprep, then run a restriction enzyme procedure to see which one would be better for our experiment. We then prepared the C0062s for a miniprep.
6/1/15
We ran a miniprep on C0062.
C0062 #1, #2, #3 (ampicillin)
C0062 #1, #2, #3, #4, #5 ( chloramphenicol )
| DNA of each | 2uL |
|---|---|
| EcoRI | 1uL |
| PstI | 1uL |
| Buffer | 2uL |
| Distilled Water | 14uL |
| Total | 20uL |
All plasmids were cut with EcoRI and PstI, then underwent gel electrophoresis. Looking at the DNA map of J23100, which had 2,105bp, we noticed that when we cut with EcoRI and PstI, there were two fragments, of 2kbp and 850bp.
*If we cut C0062 with EcoRI and PstI, we get two fragments as well, of 2,030 bp and 822bp.
The plasmids labeled ① ② ③ have ampicillin resistance vectors.
The plasmids labeled ④ ⑤ ⑥ ⑦ ⑧ have chloramphenicol resistance vectors. Plasmid ⑧ is a C0062.
While the DNA map states that the sizes of plasmids 1, 2, 3 are accurate, because we know that they ampicillin resistance genes in the vector, there are issues with our experiment scheme.
To be able to verify the above results, we ran sequencing with B0030, C0062, and J23100.
These were the sequencing primers:
| VF2 | TGC CAC CTG ACG TCT AAG AA |
|---|---|
| VR | ATT ACC GCC TTT GAG TGA GC |
6/5/15 ~ 6/7/15
We sent J23100, B0030, C0062, C0060, B0015, K823017, J37032, and J61100 plasmid to a sequencing company to see thee exact DNA sequence of our samples.
Out of these, J23100, B0030, and B0015 had different sequence results than we had expected when comparing with samples on the Registry.
So we decided to change these parts.
| constitutive promoter | J23100 -> J61100 | ampicillin |
|---|---|---|
| RBS | B0030 -> J61100 | |
| LuxR | C0062 | ampicillin |
| terminator | K823017 -> K823017 | chloramphenicol |
| LuxRresponsive GFP | J37032 | chloramphenicol |
| AiiA | C0060 | chloramphenicol |
BBa J61100 plate 4 16C
BBa C0062 plate 2 4L
BBa K823017 plate 1 3D
BBa J37032 plate 3 8O
BBa C0060 plate 2 4H
6/7/15
We transformed J61100, and spread it on the ampicillin medium.
6/8/15
We picked 3 colonies from J61100 and inoculated for the miniprep.
6/11/15
We inoculated J61100 for the midiprep.
6/12/15
We ran a midiprep on the J61100.
6/15/15
Enzyme digestion
We digested J61100 with SpeI and PstI (used as a vector), while we digested C0062 with XbaI and PstI(used as a fragment), and digested C0060 (used as a fragment) with a XbaI and PstI. We then ran a gel electrophoresis and then extracted the gel for the plasmid fragment.
Ligation
We ligated J61100 and C0062 while we ligated J61100 and C0060.
Transformation
We then ran a transformation of these onto some competent cells.
6/16/15
We picked 6 colonies of each of J61100+C0062 and J61100+C0060, and inoculated them on the liquid LB. We then incubated the cell culture overnight for 16 hours.
6/17/15
We conducted a mini prep on J61100+C0062 and J61100+C0060.
Enzyme digestion
We digested J37032 with XbaI and PstI (used as a fragment), and K823017 with SpeI and PstI (used as a vector). We then ran a gel electrophoresis and then extracted the gel for the plasmid fragment.
Ligation
We ligated J37032 and K823017.
Transformation
We then ran a transformation of these onto some competent cells.
6/18/15
We picked up 6 colonies of J37032+K823017 and inoculated them on the liquid LB. We then incubated the cell culture overnight for 16 hours.
6/19/15
We conducted a mini prep on J37032+K823017
66/22/15
We chose the plasmid which has plasmid that we want, and then we cut those plasmids with EcoRI and PstI. After that, we sent them to the sequencing company.
6/25/15
We learned that J61100 had ampicillin expression so we changed the vector to have chloramphenicol resistance.
6/29/15
Enzyme digestion
We cut J61100+C0062 with SpeI and PstI (used as the vector), while we cut K823017+J37032 with XbaI and PstI (used as the fragment). We then ran a gel electrophoresis and then extracted the gel for the plasmid fragment.
Ligation
We ligated J61100+C0062 and K823017+J37032, creating the reporter cell.
Transformation
We then ran a transformation of these onto some competent cells.
6/30/15
We picked up 6 colonies of the reporter cell and inoculated them on the liquid LB. We then incubated the cell culture overnight for 16 hours.
7/1/15
We conducted a mini prep on the reporter cell.
7/2/15
We chose the plasmid which has plasmid that we want, and then we cut those plasmids with EcoRI and PstI. After that, we sent them to the sequencing company.