Team:Newcastle/Labwork/21 August 2009

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[[Image:Team Newcastle 2009 iGEM 21-08-09 IMG 0513.JPG|200px|thumb|Mathew resuspending the pellet with Resuspension + RNAse Solution]]

Revision as of 18:53, 20 October 2009


Team Newcastle 2009 iGEM ProbationaryP-Sign.PNG

Formal Lab Session - 21st August 2009

Team Newcastle 2009 iGEM 21-08-09 IMG 0509.JPG


Overview



Stochastic Switch Team

Summary

Today the stochastic team split into two, to fully utilise the time in the lab. Jess carried out minipreps for the BBa_C0178 in E.coli DH5alpha cultures that were set up yesterday. Goksel carried oud restriction digests of the BioBricks R0062; R0079; C0161; C0179; J44000 which were miniprepped yesterday.

Miniprep of C0178 cultures

Goksel has certainly picked up his lab skills very quickly, making a very neat job of filling the gel wells

As it happens only 2 of the 3 cultures grew from yesterdays overnights so these were spun down (1ml of each). It was decided that these cultures would be treated separately until after being run on a gel so their identities could be confirmed.

After spinning the cultures down after the addition of solution III, it was observed that there was not much of a protein pellet to be seen which should precipitate after solution III is added. The tubes were shaken well and put in to centrifuge for a further 10 miutes and a larger pellet was seen.

N.B: During our minipreps we have always kept solution III on the bench, however Chris seeing this advised us to always keep solution III in the fridge for the best results. As well as this after the addition of solution III the tubes must be shaken well in order for the proteins to precipitate properly. Remember that Phil's protocols may not always be explicit and although care should be taken in following them, there may be important points missed out that can effect results.

The supernatant was taken and Isopropanol added, the solution was spun, ethanol added, aspirated and speed vac'd according to the protocol. The DNA pellet was resuspended in 50ul water, labelled, and frozen in the -20 freezer.


Metal Sensor Team

Introduction

Mathew resuspending the pellet with Resuspension + RNAse Solution

In yesterday's lab session the Metal Sensing team carried out a miniprep of the plasmid pSB1A3, which contained the BioBrick BBa_J33206 (taken from the Parts Registry). This BioBrick contains the arsR binding site as well as the arsR gene - both of which are needed in our system. Once the minipreps were conducted, 10 microlitres of plasmid DNA were taken from three plasmid (pSB1A3) samples (the three samples originating from the three cultures of E.coli containing BBa_J33206 extracted from the plate)and placed into one set of 3 Eppendorf tubes; and then another 10 microlitres were taken from the three samples and put into another set of 3 Eppendorf tubes.

To the first set of 3 Eppendorf tubes, no enzyme was added and to the second tube, a combination of EcoRI and PstI was added. Once the restriction enzyme digests had taken place they were placed in the -20C freezer for use today.

Another thing which was carried out yesterday was preparation of agarose gel; the agarose gel was made up in the usual way, poured in the usual way and when it had set was stored in the fridge (this was done by sprinkling 1 x TAE buffer on the gel surface and then wrapping it in cling film). This gel will be used to analyse the restriction enzyme digests of the pSB1A3 plasmid.

There are still two tasks which need to be resolved:

  • Run both the undigested and digested plasmids on agarose gel in DNA gel electrophoresis.
  • Conduct midi-preps of the plasmids if gel results are positive.


In addition to this, the Metal Sensing team are hoping to carry out a test PCR reaction on the genome of Bacillus subtilis with the pGFP-rrnb plasmid integrated within it. The Metal Sensing team have designed primers which are embedded within the amyE region of the Bacillus subtilis chromosome so any integration at that site (the pGFP-rrnb plasmid integrates in the amyE gene in B. subtilis) will be detected.

Practical Outline

Mathew loading the pSB1A2 + BBa_J33206 DNA into the wells of the gel

The tasks needed to be completed by the Metal Sensing team by the end of the day are:

  • Run both the undigested and digested plasmids on agarose gel in DNA gel electrophoresis.
  • Conduct midi-preps of the plasmids if gel results are positive.
  • Run a test PCR reaction on a crude extraction of the genome of the Bacillus subtilis which had successfully been transformed by the plasmid pGFP-rrnb


Procedure

DNA gel electrophoresis

The gel loaded with DNA samples; the top row of wells belong to the Metal Sensor team whereas the bottom set of wells belong to the Stochastic Switch team

DNA gel electrophoresis was used to analyse the restriction enzyme digests for the three samples of the plasmid pSB1A3 containing BioBrick BBa_J33206. Three samples set aside for electrophoresis contained no restriction enzymes where as three samples of the BioBrick were treated with both EcoRI and PstI. The protocol used to prepare the DNA and to load the samples into the gel can be found at these links.

The way in which the samples were set up in terms of DNA gel wells were as follows:

  • Lane 1 = blank
  • Lane 2 = DNA ladder (HindIII ladder)
  • Lane 3 = Sample 1 (BBa_J33206) + no enzymes
  • Lane 4 = Sample 2 (BBa_J33206) + no enzymes
  • Lane 5 = Sample 3 (BBa_J33206) + no enzymes
  • Lane 6 = blank
  • Lane 7 = Sample 1 (BBa_J33206) + EcoRI + PstI
  • Lane 8 = Sample 2 (BBa_J33206) + EcoRI + PstI
  • Lane 9 = Sample 3 (BBa_J33206) + EcoRI + PstI
  • Lane 10 = DNA ladder (HindIII ladder)


The only change to the protocol is that 8 microlitres of ach of the prepared samples were placed into the wells. This is because the pSB1A3 plasmid is a high copy plasmid so the concentration of DNA will be high. Apart from that, the protocol was adhered to.

The results from the gel can be seen in the 'Results' section below.

Midi Preps

Mathew adding other Midi-Prep solutions to the transformed E.coli cells
The cell lysate floats at the top of the syringe barrel - eventually all of the clear solution below it will be transferred into the binding column

When looking at the mini-prep restriction enzyme digests on the gel, it was noted that although the bandwidths seen weren't what was expected the bands that did form were consistent for all three cultures. This could be down to a number of factors - the most likely factor, in these circumstances, are the restriction enzymes (see below in 'Results' section). Because of the consistency of the samples in the gel, both digested and undigested, it was decided that the Metal Sensor team prepare midi-preps of the pSB1A3 plasmid.

The protocol used was SigmaAldrich's MidiPrep protocol. The Spin Method (i.e. using a centrifuge to move solutions through the column) was the preferred route in this protocol and all the steps involved in this procedure were carried out, up until step 11b. The DNA was then stored in the freezer for use tomorrow.

While the Metal Sensor team had prepared three overnight cultures to be used in the midiprep today (the three cultures derived from three colonies of E. coli all containing pSB1A3 and BBa_J33206) only one of these colonies was taken forward for midipreps. It was decided that the overnight culture grown from colony 1 would be used for midipreps - this was because of the clarity of the bands produced by colony 1 in both the undigested and digested samples.

A summary of the steps were as follows:

  • 50ml of culture 1 was spun down for 10 minutes at 5,000g. The supernatant was aspirated off and the pellet was resuspended in 4ml Resuspension/RNAse solution.


  • 4ml of lysis solution was immediately applied and after inverting the falcon tube 6 times, the solution was allowed to sit on the bench for 4 minutes. 4ml neutralisation solution was added once the time had expired and the tube inverted 6 times again.


  • 3ml of binding solution was added and after 2 inversions the solution was placed into the filter syringe. With the plunger removed from the syringe, the lysate remained in the syringe for 5 minutes. During this time, 4ml of Column Preparation Solution was allowed to be run through the midiprep binding column (by centrifugation).


  • The plunger was then applied to the syringe and half of the lysate (which had been sitting in the syringe barrel for 5 minutes) was injected into the midiprep binding column. The binding column was placed in the centrifuge at 3,000g for 2 minutes and once the eluate had filtered through the remaining half of the lysate was added and treated in the same way.


  • 4ml of Wash Solution 1 was then added to the binding column and centrifuged for 2 minutes for 2 minutes before 4ml of Wash Solution 2 was added and then placed in the centrifuge for 2 minutes again.


  • 1 ml of Elution solution was then added to the midiprep binding column before the column was spun for 5 minutes at 3,000g. The eluate was then harvested at the bottom of the binding column and transferred to the freezer for storage.


PCR Reactions

  • Primers are sent by the oligo company in dehydrated form, and a sheet is attached with each primer's properties.
  • Once we receive the primers from the oligo company, we need to enter it into PA' primer database. Only Chris have access to the database, so we need to kindly ask him to open the database for us.
  • Data needed to be entered into the database: primer name, sequence, primer length and oligo company's name.
  • The database will give a primer number which we need to write on the tube's lid and on the primer's properties sheet. In today's case, we got:
pGFPconf1 : primer 501
pGFPconf2 : primer 502
pGFPconf3 : primer 503
pGFPconf4 : primer 504
  • Then, we need to rehydrate the primers. In order to do that, we took the primer properties sheet and found the primer concentration in nMoles. Multiply that number by 5 and you get the amount of water to be added to the primer in order to make it into the standard PA lab's primer concentration of 200ng/ul.

For todays's case:

pGFPconf1 : 20.2nmoles > added 20.2 x 5 = 101 ul of PCR water
pGFPconf2 : 30.3nmoles > added 30.3 x 5 = 151.5 ul of PCR water
pGFPconf3 : 28.5nmoles > added 28.5 x 5 = 142.5 ul of PCR water
pGFPconf4 : 21.7nmoles > added 21.7 x 5 = 108.5 ul of PCR water
  • The rehydrated primer stock then needs to be diluted 1:10 for working concentration; therefore, we got 50ul from the primer stock and added 450ul of PCR water.
  • Once rehydrated, the primers stock can be stored in the -20C freezer in the primer box, the 1:10 primer dilution can be stored the -20C freezer in the diluted primer box.
  • We made PCR water: got 50ml of UV-sterilised water from the stock and filter sterilised it into a 50ml Falcon tube.


Results

Team Newcastle 2009 iGEM geldoc 2009-08-21 14hr 16min Mathew.jpg


The first and last wells in this photograph which are yielding bands are the HindIII ladder DNA, used for comparisons. The first three lanes next to the starting HindIII lane are the BBa_J33206 BioBrick in pSB1A2 plasmid with no enzymes added. The next three lanes (missing out the blank lane used as a spacer) are the BBa_J33206 BioBrick in pSB1A2 plasmid with restriction enzymes EcoRI + PstI added.

The samples of BBa_J33206 BioBrick in pSB1A2 plasmid with no enzymes added show consistency as do the samples of BBa_J33206 BioBrick in pSB1A2 plasmid with restriction enzymes EcoRI + PstI added. However the band sizes for the digested BioBrick samples don't appear to match the expected bands; the BioBrick insert, according to the [http://partsregistry.org/Part:BBa_J33206 parts registry entry], should be 956 bp and exist as one band whereas the gel suggests it could be between 125bp and 2027bp and could be any of the two bands present. No matter which band you look at, the insert on the gel doesn't match the expected BioBrick size.

Nevertheless, due to the consistency of the bands it is likely that there is no contamination in the samples. These samples can therefore be used for midi-preps and then analysed using better restriction enzymes.

The probable reason for the bands looking incorrect is the restriction enzymes used. In a previous experiment we had aliquoted some EcoRI and PstI enzymes into separate Eppendorf tubes; for this experiment we used these aliquoted enzymes rather than enzymes taken from the original container. The aliquoting and subsequent exposure to room temperature may have lead to the degradation of enzyme efficiency.

July
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[http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/6_July_2009&action=edit 6] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/7_July_2009&action=edit 7] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/8_July_2009&action=edit 8] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/9_July_2009&action=edit 9] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/10_July_2009&action=edit 10] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/11_July_2009&action=edit 11] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/12_July_2009&action=edit 12]
[http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/13_July_2009&action=edit 13] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/14_July_2009&action=edit 14] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/15_July_2009&action=edit 15] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/16_July_2009&action=edit 16] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/17_July_2009&action=edit 17] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/18_July_2009&action=edit 18] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/19_July_2009&action=edit 19]
[http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/20_July_2009&action=edit 20] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/21_July_2009&action=edit 21] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/22_July_2009&action=edit 22] [http://2009.igem.org/Team:Newcastle/Labwork/23_July_2009 23] [http://2009.igem.org/Team:Newcastle/Labwork/24_July_2009 24] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/25_July_2009&action=edit 25] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/26_July_2009&action=edit 26]
[http://2009.igem.org/Team:Newcastle/Labwork/27_July_2009 27] [http://2009.igem.org/Team:Newcastle/Labwork/28_July_2009 28] [http://2009.igem.org/Team:Newcastle/Labwork/29_July_2009 29] [http://2009.igem.org/Team:Newcastle/Labwork/30_July_2009 30] [http://2009.igem.org/Team:Newcastle/Labwork/31_July_2009 31]
August
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[http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/3_August_2009&action=edit 3] [http://2009.igem.org/Team:Newcastle/Labwork/4_August_2009 4] [http://2009.igem.org/Team:Newcastle/Labwork/5_August_2009 5] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/6_August_2009&action=edit 6] [http://2009.igem.org/Team:Newcastle/Labwork/7_August_2009 7] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/8_August_2009&action=edit 8] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/9_August_2009&action=edit 9]
[http://2009.igem.org/Team:Newcastle/Labwork/10_August_2009 10] [http://2009.igem.org/Team:Newcastle/Labwork/11_August_2009 11] [http://2009.igem.org/Team:Newcastle/Labwork/12_August_2009 12] [http://2009.igem.org/Team:Newcastle/Labwork/13_August_2009 13] [http://2009.igem.org/Team:Newcastle/Labwork/14_August_2009 14] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/15_August_2009&action=edit 15] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/16_August_2009&action=edit 16]
[http://2009.igem.org/Team:Newcastle/Labwork/17_August_2009 17] [http://2009.igem.org/Team:Newcastle/Labwork/18_August_2009 18] [http://2009.igem.org/Team:Newcastle/Labwork/19_August_2009 19] [http://2009.igem.org/Team:Newcastle/Labwork/20_August_2009 20] [http://2009.igem.org/Team:Newcastle/Labwork/21_August_2009 21] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/22_August_2009&action=edit 22] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/23_August_2009&action=edit 23]
[http://2009.igem.org/Team:Newcastle/Labwork/24_August_2009 24] [http://2009.igem.org/Team:Newcastle/Labwork/25_August_2009 25] [http://2009.igem.org/Team:Newcastle/Labwork/26_August_2009 26] [http://2009.igem.org/Team:Newcastle/Labwork/27_August_2009 27] [http://2009.igem.org/Team:Newcastle/Labwork/28_August_2009 28] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/29_August_2009&action=edit 29] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/30_August_2009&action=edit 30]
[http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/31_August_2009&action=edit 31]
September
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[http://2009.igem.org/Team:Newcastle/Labwork/7_September_2009 7] [http://2009.igem.org/Team:Newcastle/Labwork/8_September_2009 8] [http://2009.igem.org/Team:Newcastle/Labwork/9_September_2009 9] [http://2009.igem.org/Team:Newcastle/Labwork/10_September_2009 10] [http://2009.igem.org/Team:Newcastle/Labwork/11_September_2009 11] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/12_September_2009&action=edit 12] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/13_September_2009&action=edit 13]
[http://2009.igem.org/Team:Newcastle/Labwork/14_September_2009 14] [http://2009.igem.org/Team:Newcastle/Labwork/15_September_2009 15] [http://2009.igem.org/Team:Newcastle/Labwork/16_September_2009 16] [http://2009.igem.org/Team:Newcastle/Labwork/17_September_2009 17] [http://2009.igem.org/Team:Newcastle/Labwork/18_September_2009 18] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/19_September_2009&action=edit 19] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/20_September_2009&action=edit 20]
[http://2009.igem.org/Team:Newcastle/Labwork/21_September_2009 21] [http://2009.igem.org/Team:Newcastle/Labwork/22_September_2009 22] [http://2009.igem.org/Team:Newcastle/Labwork/23_September_2009 23] [http://2009.igem.org/Team:Newcastle/Labwork/24_September_2009 24] [http://2009.igem.org/Team:Newcastle/Labwork/25_September_2009 25] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/26_September_2009&action=edit 26] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/27_September_2009&action=edit 27]
[http://2009.igem.org/Team:Newcastle/Labwork/28_September_2009 28] [http://2009.igem.org/Team:Newcastle/Labwork/29_September_2009 29] [http://2009.igem.org/Team:Newcastle/Labwork/30_September_2009 30]
October
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      [http://2009.igem.org/Team:Newcastle/Labwork/1_October_2009 1] [http://2009.igem.org/Team:Newcastle/Labwork/2_October_2009 2] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/3_October_2009&action=edit 3] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/4_October_2009&action=edit 4]
[http://2009.igem.org/Team:Newcastle/Labwork/5_October_2009 5] [http://2009.igem.org/Team:Newcastle/Labwork/6_October_2009 6] [http://2009.igem.org/Team:Newcastle/Labwork/7_October_2009 7] [http://2009.igem.org/Team:Newcastle/Labwork/8_October_2009 8] [http://2009.igem.org/Team:Newcastle/Labwork/9_October_2009 9] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/10_October_2009&action=edit 10] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/11_October_2009&action=edit 11]
[http://2009.igem.org/Team:Newcastle/Labwork/12_October_2009 12] [http://2009.igem.org/Team:Newcastle/Labwork/13_October_2009 13] [http://2009.igem.org/Team:Newcastle/Labwork/14_October_2009 14] [http://2009.igem.org/Team:Newcastle/Labwork/15_October_2009 15] [http://2009.igem.org/Team:Newcastle/Labwork/16_October_2009 16] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/17_October_2009&action=edit 17] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/18_October_2009&action=edit 18]
[http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/19_October_2009&action=edit 19] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/20_October_2009&action=edit 20] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/21_October_2009&action=edit 21] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/22_October_2009&action=edit 22] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/23_October_2009&action=edit 23] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/24_October_2009&action=edit 24] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/25_October_2009&action=edit 25]
[http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/26_October_2009&action=edit 26] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/27_October_2009&action=edit 27] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/28_October_2009&action=edit 28] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/29_October_2009&action=edit 29] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/30_October_2009&action=edit 30] [http://2009.igem.org/wiki/index.php?title=Team:Newcastle/Labwork/31_October_2009&action=edit 31]



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