Back to iGEM 2010

Lab notes (7/12 - 7/18)

Contents 1 Lab notes (7/12 - 7/18) 1.1 Group: Flagella 1.1.1 Extraction of psb3k3 plasmids with incerted RFP from E. coli MG1655 1.1.1.1 Exp. 1 1.1.1.2 Exp. 2 1.1.1.3 Exp. 3 1.1.2 Amplification of FlhDC, FlhD and FlhC genes 1.1.3 Amplification of FlhDC with Pfu 1.1.4 Amplification of FlhDC with pfx 1.1.5 Amplification of FlhDC with Taq 1.1.6 Genomic DNA purification 1.2 Group: Photosensor 1.3 Group: Retinal 1.3.1 Transformation of TOP10 e. coli with BBa_K274210 1.3.2 Transformation of BBa_R0011 and BBa_I0500 1.3.3 Mini-prep of pSB1A2 w. B0034, pSB1AK3 w. B0015 and pSB3K3 w. J04450(transformation from 08/07) 1.3.4 Transformation of MG1655 e. coli with BBa_274210, BBa_E0040 and BBa_I0500 1.3.5 Miniprep of BBa_K098995 in pSB1A2 1.3.6 Extraction of BBa_B0034 from pSB1A2 plasmid using PFU

Group: Flagella

Extraction of psb3k3 plasmids with incerted RFP from E. coli MG1655

Exp. 1

Methods: Miniprep, NanoDrop and gel electrophoresis

protocols: MP1.1

Notes: We used 9 ml ON culture (Lag phase cells), loaded 2ul sample and 8ul agarose loading dye on a 1,5% gel,used a DNA ladder mix (100-10000 nucleotides) as marker

Results: Nanodrop: Tube 1: 30.7 mg/ul Tube 2: 27.4 mg/ul

Gel electrophoresis: No result

--Louise 15:00, 9 July 2010 (UTC)

Exp. 2

Methods: gel electrophoresis

Notes: We ran another gel electrophoresis on the miniPrep sample form above. But now we loaded 4ul sample and 4ul agarose loading dye on a 1,5% gel,used a DNA ladder mix (100-10000 nucleotides) as marker.

Results: Gel electrophoresis: Bands were detected. The psb3k3 plasmid is 2750bp long and the RFP with generator is 1096 bp, which gives a band at about 4000bp compaired with the marker.

Exp. 3

Methods: MiniPrep, NanoDrop and gel electrophoresis.

protocols: MP1.1

Notes: We used 10 ml af a culture in Log phase (1ml cells from an ON culture + 9ml LB medium, incubated at 37 degrees celcius for 4 hours), loaded 4ul sample and 4ul agarose loading dye on a 1,5% gel,used a DNA ladder mix (100-10000 nucleotides) as marker.

Results: Nanodrop: Tube 1: 38.7 mg/ul Tube 2: 32.4 mg/ul.

Gel electrophoresis: Bands were detected.

--Louise 17:21, 12 July 2010 (UTC)

Amplification of FlhDC, FlhD and FlhC genes

Methods: PCR and Gel electrophoresis.

Protocols: CHP1.2

Notes: We decided to test our primers on previously purified cromosomal DNA. Examination of the primers showed that the FlhC reverse primer had a melting temperature of only 45˚C. Therefore we decided to run the samples on a gradient PCR. Simultaneously, we prepared 2 extra samples, isolating FlhD and FlhC, respectively. We did this because we wanted to see if our problems were caused because the combined gene-sequence was to long (932bp).
Because we just wanted to test our primers in this PCR, we used Taq polymerase, because although it doesn’t proofread, it is remarkably cheaper than Pfu. On the [http://www.fermentas.com/en/products/all/pcr-qpcr-rt-pcr/standard-pcr/ep028-taq-dna-native Fermentas homepage] we found that the annealing temperature for Taq is Tm-5 , which in this case means 40˚C. However, Taq polymerase is not very effective at temperatures under 50˚C so we designed the gradient to lies between 40 and 55˚C. The PCR machine chose the following temperatures:

Colum	Temperature (Celcius)
1	39.9
2	40.3
3	41.2
4	42.6
5	44.3
6	46.3
7	48.3
8	50.5
9	52.1
10	53.6
11	54.6
12	55.1

We then chose six temperatures to test:

Sample	Temperature (Celcius)
1	40.3
2	42.6
3	44.3
4	446.32.6
5	48.3
6	50.3

The following table shows the Gradient PCR program:

Temperature (Celcius)	Time (min)	Description
94	3	Initialization
94	2	Denaturation
40-55	½	Annealing
72	2 x 29	Elongation
72	5	Final Elongation
4		Hold

Results: The experiment was succesfull! We could detect FlhDC DNA at temperatures between 42.6˚C and 48.3˚C. FlhD DNA at temperatures between 40.3˚C and 44.3˚C and also between 48.3˚C and 50.3˚C. FlhC DNA at temperatures run between 40.3˚C and 50.3˚C.

--Sheila 08:46, 14 July 2010 (UTC)

Amplification of FlhDC with Pfu

Date: july 12th

methods: PCR and gel electophoresis

Protocols: CHP1.2

Notes: The purified chromosomal DNA was tested with Pfu; a polymerase with proofreading ability. The DNA was from the E. coil strain MG 1655 (tube 17) The annealing temperature was used fore the PCR was 44˚C. We decide use this annealing temperature while it is in the middle of the temperature span we successful used in the last experiment. Further we increas the elongation time to 1 min and 30 sec. Other than these changes we followed the PRC program in the protocol. the PCR product was run on a 1,5% agarose gel.

results: Unfortunately the experiment did not give any results on the gel.

--Pernm07 10:56, 13 July 2010 (UTC)
--Sheila 08:47, 14 July 2010 (UTC)

Amplification of FlhDC with pfx

Date: july 13th

methods: The experiment was perform in the E.coli strain, MG1655. The DNA purification was done in duplicates and are saved in the freezer in tube 8 and 9. (green label). There DNA concentration was measure by Nano Drop and there contantretion are 16,87ng/uL and 19,25ng/uL, respectively.

protocol: GP1.1 and CP1.1.

Notes: The experiment was generally preformed corresponding to the protocol but small modification was made. In the DNA purification experiment we used 300uL instead of 200uL of the overnight culture and it is important to remember that the 800uL precipitation sulution, containing 80uL solution and 720uL deionized water, are made directly before use.
because our PRC for the time being havent been successful we are trying to do PCR with pfx wich are another polymerase with proofreading ability. The PRC program used for running PRC with pfx are as described below:

1	start	94°C	2 min
2	Denaturing	94°C	1min
3	Annealing	48°C	1 min
4	Elongation	68°C	2 min
5	GOTO 2		Rep x 29
6	End	68°C	3min
7	Hold	4°C

results: there did not appear any lanes when we runed the gel electophoresis. Therefore the next step is to run PCR with Taq polymerase to check if the problem are the pfu polymerase or if the DNA is not purify properly.

--Pernm07 10:19, 13 July 2010 (UTC)
--Sheila 08:49, 14 July 2010 (UTC)

Amplification of FlhDC with Taq

Date: july 14th

Methods: The experiment was perform in the E.coli strain, MG1655, from freezer tube 8 and 9 wich was also used for amplification of FlhDC with pfx. In this experiment PCR was runned with Taq polymerase. the experiment was preformed according to the CP1.1 protocol. Protocol: CP1.1.

Results: we did not get any results

--Pernm07 07:51, 14 July 2010 (UTC)

---

Genomic DNA purification

Date: July 14th

Experiment done by: Pernille and Louise

Methods: We used a ON culture of MG1655 cells

Protocols: GP1.1

Notes: We made four tupes with 300ul MG1655 cell media instead of 200ul. In tupe 1 and 2 I unfortunately added 800ul un-diluted precipitation solution, in tupe 3 and 4 I diluted the precipitation solution according to the GP1.1 protocol.

Results: As expected there were no result form tupe 1 and 2

--Louise 10:44, 14 July 2010 (UTC)

Group: Photosensor

Group: Retinal

Transformation of TOP10 e. coli with BBa_K274210

Experiment continued from last week.

Colony PCR of K274210 in pSB1A2

Start date: July 12th End date: july 12th

Experiment done by: Christian, Lars Christian

Methods: Colony PCR (modified)

Protocol: CP1.2

Notes: MgCl2 was added as a gradient,sample 1-2 contain 2 ul (0,04255), sample 3-5 2,25ul (0,04787). We mistakenly added 30ul (instead of 17ul) premix to sample 6 - 9, so the concentration of MgCl2 is reduced. Sample 6 contains 2,25ul (0,0375), Sample 7-8 2,5ul (0,04167), Sample 9 2,75ul (0,04583).

Gel was loaded with DNA-ladder plus, with the upper marker at 5000bp.

Results: We found plasmids at the expected 5kbp marker in colonies 1-8. Successful plates were kept in incubator over night. They will be made into ON cultures and thereafter frozen.

Analysis: It seems we have transformed our cells with BBa_K274210. Confirmation will come when we run experiments to demonstrate presence of Beta-carotene.

Transformation of BBa_R0011 and BBa_I0500

Start date: 12/07 End date:14/07
Methods: ON culture, competent cells, transformation.
Protocols:CC1.1, TR1.1.

Making competent E.Coli TOP 10
Experiment done by: Christian, Maria and LC
Date: 12/07
Notes: Everything was done after protocol.
Results: We made competent cells for use within 48 hours.
Analysis:


Transformation of pBad and lacl promoter
Experiment done by: Christian, Maria and LC
Date: 12/07 - 13/07
Notes: Added 200ul of the un-pelleted cells, instead of 150ul to the agar plates.
Some of the agar dishes were damaged during drying and plating. We tried to use them anyways.

Results: No plates showed colonies, apart from the positive control
Analysis: Either our cells weren't competent, or our agar dishes might have been the cause.

Mini-prep of pSB1A2 w. B0034, pSB1AK3 w. B0015 and pSB3K3 w. J04450(transformation from 08/07)

Start date: 12/07 End date: 12/07
Methods: [MiniPrep]

Protocol: Fermentas protocol

Notes: pellet from 10 mL ON-culture was resuspended in 500uL resuspension buffer, and transferred into two eppendorf tubes, which were run in parellel

samples were loaded into a 1% gel with a gene ruler red marker.

Results:

Transformation of MG1655 e. coli with BBa_274210, BBa_E0040 and BBa_I0500

Start Date: 13/07 End Date:
Methods: ON cultures, Competent Cells, Transformation of competent cells.

Protocols: CC1.1, TR1.1

Experiment: Making Competent e. coli MG1655
Experiment done by: Christian
Date: 13/07

*ON cultures of strain MG1655 were put over the night before.
Notes: Eksponential growth was started at 09.30 with an OD of 0.19A. The cells were harvested at 10.26. OD was .048 at 10x dillution.

Cells were put in fridge at 11.00. They will be ready at 11.30 and good for 48 hours.

Results: Competent cells were made according to protocol. Apparently MG1655 strain reaches OD 0.5 at least an hour faster than TOP 10.

Analysis:It is important to measurement at 10 minute intervals after OD 0.20 when growing MG1655 strain.

Experiment: Transforming MG1655 strain with BBa_E004 (GFP coding sequence) and BBa_I0500 (pBad arabinose inducible promoter)
Date: 13/07-2010

Notes: I0500 is located in pSB2K3. E0040 is in pSB1A2. 200ul cells were added to each tube. Positive control is RFP generator as usual. Negative control is just cells.

Only 1ul DNA material was transferred per tube, since it was taken from distribution plates.

Plates were dried at 42°C for 15 minutes, just prior to plating. Upon plating we discovered a problem with many of the ampicilin plates we made a couple of days ago. The agar breaks on the slightest contact, and are therfore impossible to use.

As a result of the defective agar plates, most of our cells carrying BBa_E0040 were ruined. We managed to save and plate out two batches, one from each tube, so we are hoping for the best tomorrow.

Miniprep of BBa_K098995 in pSB1A2

Start date: 13/07 End date: 13/07
Methods: Fermentas GeneJET plasmid miniprep kit

Protocol: MP1.1

Experiment done by: LC

Notes: Centrifuged the ON for 15 mins. at 3000 rpm. Loaded 10 ml of culture in each tube and added 500ul resuspension solution, then split it into two samples.

Results:
Results were as expected (correct), the plasmid was around 3000 bp long on the gel.(Insert Gel picture and nanodrop results table)

Analysis:All four samples turned out fine, so they were pooled and frozen. (for details see results)
Nr. 28 in the freezer = BBa_K098995

Extraction of BBa_B0034 from pSB1A2 plasmid using PFU

Date: 14/7
Methods: PCR of DNA in solutions
Protocol: CP1.1-PFU protocol

Experiment done by: Christian

Notes: DNA material from tube 27 was taken from the freezer. Primers were standard vr-vf2, also from freezer. PFU buffer with MgSO4 was used. No further MgSO4 was added. A TAQ control was done in a parallel experiment.

Protocol was followed to point, with the exeption of 1ul additional H2O being added because of an error. It will yield 51ul.

Program was run according to protocol. elongation time was set to 1 minute and 30 seconds.

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