Difference between revisions of "Team:Goettingen/Results"
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<p> </p> | <p> </p> | ||
<p><strong>MICROSCOPY</strong></p> | <p><strong>MICROSCOPY</strong></p> | ||
| − | <p><span lang="EN-US">To check the activity of RFP fluorescence microscopy was performed with the RFP DsRed filter (excitation at 536 nm, emission at 582 nm). Unfortunately no fluorescence could be detected throughout the whole project with different constructs. Neither in the pJET_RFP_3, nor the pBAD_RFP_3, nor in the pBAD_RFP_ACEL construct. Nevertheless every time the DNA sequences were correct (Sanger sequencing). It might be a problem of expression. In future we want to exchange our vector system (pET100 instead of pBAD) to ensure that pBAD is not somehow interfering with our chosen <em>E. coli</em> strain.</span></p> | + | <p><span lang="EN-US">To check the activity of RFP fluorescence microscopy was performed with the RFP DsRed filter (excitation at 536 nm, emission at 582 nm). Unfortunately no fluorescence could be detected throughout the whole project with different constructs. Neither in the pJET_RFP_3, nor the pBAD_RFP_3, nor in the pBAD_RFP_ACEL construct. Nevertheless every time the DNA sequences were correct (Sanger sequencing). It might be a problem of expression. |
| + | <p> </p> | ||
| + | <p>Future plans</p>In future we want to exchange our vector system (pET100 instead of pBAD) to ensure that pBAD is not somehow interfering with our chosen <em>E. coli</em> strain.</span></p> | ||
</div> | </div> | ||
Revision as of 10:15, 16 September 2015
Project Results
Transformation Efficiency Kit, RFP construct (iGEM)
Before using our competent E. coli TOP10 cells in the important experiments, we used the Transformation Efficiency Kit to test the efficiency of our competent cells!
The kit includes five vials of each different DNA concentration: 50pg/μl, 20pg/μl, 10pg/μl, 5pg/μl, 0.5pg/μl of purified DNA from BBa_J04450 (RFP construct) in plasmid backbone pSB1C3.
The first test transformation (50 μl of competent cells, 20 μl plated) showed very poor results:
|
DNA concentration |
0.5pg/μl |
5pg/μl |
10pg/μl |
20pg/μl |
50pg/μl |
|
# of colonies |
0 |
0 |
2 |
0 |
13 |
|
efficiency (cfu) |
0 |
0 |
3.8x106 |
0 |
3.4x106 |
|
Results |
efficiency |
|
average |
1.4x106 |
|
weighted |
3.5x106 |
The second test transformation (200 μl of competent cells, 100 μl plated) showed still poor results but we decided to continue working with our cells:
|
DNA concentration |
0.5pg/μl |
5pg/μl |
10pg/μl |
20pg/μl |
50pg/μl |
|
# of colonies |
1 |
13 |
1 |
35 |
28 |
|
efficiency (cfu) |
8.0x106 |
1.0x107 |
4.0x105 |
7.0x106 |
2.3x106 |
|
Results |
efficiency |
|
average |
5.6x106 |
|
weighted |
3.7x106 |
RFP
RFP
RFP (RFP DsRed) was amplified from by PCR (Fig.1). Colonies on a plate were given to us by the Applied and Genomic Microbiology department. Primers contained restriction sites for KpnI and SacI in order to make them compatible for insertion into the multiple cloning site of the pBAD A vector.
After purification of the PCR product it was ligated into pJET1.2 by subcloning (blunt end ligation). This vector serves to clone the fluorescent protein without triggering its activity, which may interact with the expression vector or the chosen E.coli strain.
Ligation into pJET1.2 was followed according to the protocol in the methods collection. After over-night incubation colonies were picked, plasmids extracted with the QIAGEN QIAprep Spin Miniprep Kit and restricted with KpnI and SacI (Fig.2).
RESULT
Both sequences were correct. We decided to work with pJET_RFP_3. The plasmid was transformed with E.coli TOP10 and E.coli BL21. Cryocultures were frozen for a strain collection.
Afterwards the RFP_3 insert was ligated into pBAD A via the T4 ligase system according to the protocol in the methods collection and transformed into E.coli TOP10.
MICROSCOPY
To check the activity of RFP fluorescence microscopy was performed with the RFP DsRed filter (excitation at 536 nm, emission at 582 nm). Unfortunately no fluorescence could be detected throughout the whole project with different constructs. Neither in the pJET_RFP_3, nor the pBAD_RFP_3, nor in the pBAD_RFP_ACEL construct. Nevertheless every time the DNA sequences were correct (Sanger sequencing). It might be a problem of expression.
Future plans
Esterase and Phosphatase
Project Achievements
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