Team:Exeter/lab book/1gp/wk4

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       <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk1"; style="color:#57b947">Single Gene Plasmids and Enzyme Characterisation</a>
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/proto"; style="color:#57b947">Protocols</a>
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        &nbsp;|&nbsp;
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       &nbsp;|&nbsp;
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/novpol/wk1"; style="color:#57b947">Showcasing Polysaccharide Production</a>
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk1"; style="color:#57b947">Single Gene Plasmids and Enzyme Characterisation</a>
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/3gip/wk1"; style="color:#57b947">The 3-Gene Inducible Plasmid</a>
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/novpol/wk1"; style="color:#57b947">Showcasing Polysaccharide Production</a>
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      &nbsp;|&nbsp;
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/gibs/wk1"; style="color:#57b947">Operon Construction</a>       
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/3gip/wk1"; style="color:#57b947">The 3-Gene Inducible Plasmid</a>
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/glyco/wk1"; style="color:#57b947">Glycobase</a>
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/gibs/wk1"; style="color:#57b947">Operon Construction</a>       
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      <a href="https://2012.igem.org/Team:Exeter/lab_book/glyco/wk1"; style="color:#57b947">Glycobase</a>
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         <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk6"; style="color:#1d1d1b">13th - 24th August</a>
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         <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk6"; style="color:#1d1d1b">13th - 17th August</a>
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         <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk7"; style="color:#1d1d1b">27th - 31st August</a>
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         <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk7"; style="color:#1d1d1b">20th - 24th August</a>
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        <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk11"; style="color:#1d1d1b">17th - 21st September</a>
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        <a href="https://2012.igem.org/Team:Exeter/lab_book/1gp/wk12"; style="color:#1d1d1b">24th - 28th September</a>
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        <a href="https://2012.igem.org/Team:Exeter/Results/characterise"; style="color:#e30614" target="_blank"><font size="3"><b>Results</b></font></a>
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<u><b>Monday 30th July (9.00) –  Genomic Extraction, PCR Amplication of WbbC from BL21(DE3) and Adding Cultures to Liquid Medium</u></b>
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<u><b>Monday 30th July (9.00)</u></b>
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<p>• In duplicate, 1.5mL of overnight BL21(DE3) broth culture was transferred to a fresh, labelled 50mL Falcon tube and pelleted by centrifuging for 2 minutes at 13’000 x g. The supernatant culture medium was removed completely and discarded.</p>
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<p>• <a href="https://2012.igem.org/Team:Exeter/lab_book/proto/8" style="color:#57b947"><u>Genomic extraction</u></a> from <i>E.coli</i> BL21(DE3)</p>
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<p>• The pellet was re-suspended thoroughly in 180µL lysis solution T and 20µL RNase A solution was added. The total solution was mixed and incubated for 2 minutes at 22°C.</p>
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<p>• PCR amplification of <i>WbbC</i> from <i>E.coli</i> BL21(DE3) using <a href="https://2012.igem.org/Team:Exeter/lab_book/proto/7" style="color:#57b947"><u>two-step PCR</u></a></p>
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<p>• 20µL Proteinase K was added to the solution and then mixed. This was then incubated for 30 minutes at 55°C.</p>
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<p>• Gel Electrophoresis to check fragment size of <i>WbbC</i> PCR product</p>
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<p>• 200µL lysis solution C was added and the solution was vortexed thoroughly for about 15 seconds and then incubated again at 55°C for 10 minutes.</p>
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<p>The following concentration (in ng/µL) obtained for the BL21(DE3) genomic DNA were:
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<p>• Whilst this was incubating, 500µL column preparation solution was added to a pre-assembled GenElute miniprep binding column that was seated in a 2mL collection tube. This was centrifuged at 12’000 x g for 1 minute. Afterwards, the eluate was discarded.</p>
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<p>o 1. - 7.8.</p>
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<p>• When incubation of extracted genomic DNA of BL21(DE3) was complete, 200µL ethanol (100%) was added to the lysate and mixed thoroughly by vortexing for 5-10 seconds.</p>
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<p>o 2. - 6.6.</p>
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<p>• All the lysate-ethanol solution was transferred to the GenElute miniprep binding column, being careful to not pipette too hard as to shear the genomic DNA. The binding column with the lysate-ethanol solution was centrifuged at 6’500 x g for 1 minute. After this, the collection tube was discarded that contained the eluate and the binding column was placed in a new 2mL collection tube.</p>
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<p> Gel Electrophoresis did not show any correct PCR products (expected: 1113bp band) and it was discovered that the reverse primer was incorrect and had actually amplified a shorter section of <i>WbbC</i>, rather than the whole gene. Thus the correct reverse primer was ordered. Lane 1 = DNA hyperladder, Lane 2 = WbbC attempt from genomic DNA template 1, Lane 3 = <i>WbbC</i> attempt from genomic DNA template 2.</p>
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<p>• 500µL wash solution 1 was added to the column and centrifuged for 1 minute at 6’500 x g. The 2mL collection tube after centrifugation was discarded and the binding column was added to a new 2mL collection tube. 500µL wash solution containing ethanol was transferred to the binding column and centrifuged for 3 minutes at 13’000 x g to dry the column. The column was centrifuged for another minute so all ethanol was removed from the binding column. The collection tube containing eluate (including ethanol) was discarded and the binding column was placed in a new 2mL collection tube.</p>
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<p><img src="https://static.igem.org/mediawiki/2012/4/47/Exe2012_2012-07-30.jpg" alt="" title="" width="550" height="342"></p>
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<p>• 200µL elution solution was pipetted directly onto the center of the binding column and left to incubate at 22°C for 5 minutes. After this, the column was centrifuged for 1 minute at 6500 x g to elute the genomic DNA. This was repeated again to elute as much DNA as possible using the same 2mL collection tube.</p>
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<p>• The 2mL collection tube containing genomic DNA was stored on ice (2-8°C), and 1.5µL was used to measure DNA concentration on the Nanodropping Machine.</p>
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<p><u><b>Tuesday 31st July (15.00)</p></u></b>  
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<p>• To PCR amplify WbbC from the genomic DNA, a two master-mixes were made up containing: 10µL 5ng/µL genomic DNA (starting concentration = 7.8ng/µL for the first PCR tube and 6.6ng/µL for the second PCR tube), 1µL of dNTP’s, 1µL WbbC forward primer (at 100pmol/µL), 1µL WbbC reverse primer (at 100pmol/µL), 10µL 5x PCR buffer, 1µL Phusion polymerase and 26µL MilliQ H2O to make a total volume of 50µL.</p>
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<p>• <b>IDT re-suspension</b> and <a href="https://2012.igem.org/Team:Exeter/lab_book/proto/1" style="color:#57b947"><u>transformation</u></a> of <i>WbbC</i>(with point mutation)</p>
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<p>• Once this master-mix was made up, the PCR tube containing these reagents was put in a PCR machine that was programmed for two-step PCR (using Phusion). Because of the high TM of the forward and reverse primers for WbbC (roughly 75°C), two-step PCR using extension at 72°C was possible. The machine was programmed as: 98°C for 30 seconds, 98°C for 10 seconds and then 72°C for 2 seconds (this was repeated for 30 cycles), and then finally 72°C for 5 minutes.</p>
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<p>• As WbbC was being PCR amplified, an agarose gel for gel electrophoresis was made to verify whether WbbC was amplified. This involved adding 50mL 1x TAE buffer to 0.5g agarose and then microwaving until completely dissolved.</p>
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<p><u><b>Wednesday 1st August (15.00)</p></u></b>
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<p>• 1µL ethidium bromide (EtBr) was added to the hot dissolved agarose gel and mixed thoroughly. The entire solution was poured into a gel electrophoresis plate with a well comb inserted. Once left to set for around 15 minutes, the well comb was lifted out.</p>
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<p>• <a href="https://2012.igem.org/Team:Exeter/lab_book/proto/2" style="color:#57b947"><u>Adding cultures</u></a> with WbbC(with point mutation) plasmids into liquid medium and incubation overnight</p>
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<p>• When PCR amplification of WbbC was finished, 5µL PCR mix was added to 1µL loading buffer to make a 5x dilution. 5µL of DNA hyperladder was also added to another tube containing 1µL loading buffer (again, to make a 5x dilution).</p>
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<p> Protocol was followed using ampicillin for WbbC(with point mutation) plasmids as the selection antibiotic.</p>
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<p>• Both DNA hyperladder and PCR mix were added to different wells and then TAE buffer was added to the gel electrophoresis plate to submerge the agarose gel and therefore the two samples.</p>
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<p>• Gel electrophoresis was then conducted at 200V for 15 minutes.</p>
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<p><u><b>Thursday 2nd August (9.00)</p></u></b>
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<p>• After UV illumination, no WbbC products in lanes 2 and 3 were observed. It was discovered that the reverse primer was incorrect and had actually amplified a shorter section of WbbC, rather than the whole gene. Thus the correct reverse primer was ordered.</p>
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<p> • <a href="http://www.fermentas.com/templates/files/tiny_mce/coa_pdf/coa_k0502.pdf" style="color:#57b947"><u>Mini-Prepping</u></a> of WbbC(with point mutation) plasmid</p>
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<p>• Meanwhile, transformed competent E.coli containing recombinant pBAD/AraC promoter plasmids were picked from the 100µL spread plate and inoculated in LB broth (See: Week 30th July-03rd August 2012, Operon Construction: Mary Beton).</p>
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<p> • Gel Electrophoresis to check fragment sizes of WbbC(with point mutation) plasmid</p>
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<p><u><b>Tuesday 31st July (15.00) – IDT Re-suspension and Transformation</p></u></b>  
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<p> The following concentrations (in ng/µL) was obtained:</p>
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<p>• The synthesised gene WbbC (with a point-mutation) was re-suspended using IDTE buffer (40µL of 10mM Tris, 0.1mM EDTA), held between pH 7.5-8.0, into a fresh Eppendorf tubes, to reach an approximate concentration of 50ng/µL stock solution.</p>
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<p>o WbbC(with point mutation) - 181.6.</p>
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<p>• The tube was vortexed for 20 seconds, left to incubate at room temperature for 30 minutes, and then centrifuged for 1 minute.</p>
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<p> Gel Electrophoresis showed that WbbC(with point mutation) did not work because whilst there was a band, it was the wrong size (expected: 1113bp). This procedure was repeated again. Lane 1 = DNA hyperladder, Lane 2 = Mini-prepped WbbC.</p>
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<p>• To dilute WbbC for the transformation procedure, 2µL of re-suspended WbbC was added to MilliQ H2O (999µL) to reach an approximate concentration of 0.1ng/µL in a fresh, labelled Eppendorf. The tube was centrifuged briefly to spin down any liquid.</p>
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<p><img src="https://static.igem.org/mediawiki/2012/9/96/Exe2012_2012-08-02.jpg" alt="" title="" width="550" height="342"></p>
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<p>• After this, 2µL of diluted WbbC was pipetted gently into 50µL Top10 E.coli competent cells (Invitrogen), making sure not to mix too rigorously.</p>  
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<p>• Competent cells were then incubated on ice for 30 minutes.</p>
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<p>• They were then heat-shocked for exactly 30 seconds in a 42°C water bath, making sure not to mix or shake.</p>
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<p>• Afterwards, they were quickly placed on ice for 2 minutes.</p>
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<p>• Pre-warmed SOC medium (250µL) was added and then the Eppendorf tube containing recombinant WbbC plasmids was secured in a shaking incubator and incubated at 36.8°C for 1 hour at 220rpm.</p>
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<p>• Whilst incubating, two LB agar plates were made-up (25µL LB agar in each). One would be used for spreading 20µL of transformed E.coli competent cells and the other for 100µL of transformed E.coli competent cells, so that we would be able to pick out enough isolated colonies. 50µL ampicillin was added to 50mL of LB agar to create a 1000-fold dilution.</p>
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<p>• After the transformed E.coli competent cells had finished incubating for an hour, 20 or 100µL of the transformants were spread plated onto respective ampicillin-containing LB agar plates.</p>
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<p>• Remaining transformation mix was stored at 4°C and the two inoculated LB agar plates were inverted and placed in an incubator at 37°C overnight.</p>
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<p><u><b>Wednesday 1st August (15.00) – Adding Cultures to Liquid Medium</p></u></b>
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<p><u><b>Thursday 2nd August (9.00) – Mini-prepping and Gel Electrophoresis</p></u></b>
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    <p><u>Website Designed and Built by: Ryan Edginton, James Lynch & Alex Clowsley</u> &nbsp;&nbsp;|&nbsp;&nbsp;
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    <a href="https://igem.org/Team.cgi?id=764" style="color:#57B947" target="_blank"><u>Contact Us</u></a>  &nbsp;&nbsp;|&nbsp;&nbsp;
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    <a href="https://2012.igem.org/Team:Exeter/site_map" style="color:#57B947"><u>Site Map</u></a></p>
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Latest revision as of 23:54, 26 September 2012

ExiGEM2012 Lab Book 1GP wk4

Single Gene Plasmids and Enzyme Characterisation: 30th July - 3rd August 2012

 Monday 30th July (9.00)

• Genomic extraction from E.coli BL21(DE3)

• PCR amplification of WbbC from E.coli BL21(DE3) using two-step PCR

• Gel Electrophoresis to check fragment size of WbbC PCR product

The following concentration (in ng/µL) obtained for the BL21(DE3) genomic DNA were:

o 1. - 7.8.

o 2. - 6.6.

Gel Electrophoresis did not show any correct PCR products (expected: 1113bp band) and it was discovered that the reverse primer was incorrect and had actually amplified a shorter section of WbbC, rather than the whole gene. Thus the correct reverse primer was ordered. Lane 1 = DNA hyperladder, Lane 2 = WbbC attempt from genomic DNA template 1, Lane 3 = WbbC attempt from genomic DNA template 2.

Tuesday 31st July (15.00)

• IDT re-suspension and transformation of WbbC(with point mutation)

Wednesday 1st August (15.00)

• Adding cultures with WbbC(with point mutation) plasmids into liquid medium and incubation overnight

Protocol was followed using ampicillin for WbbC(with point mutation) plasmids as the selection antibiotic.

Thursday 2nd August (9.00)

• Mini-Prepping of WbbC(with point mutation) plasmid

• Gel Electrophoresis to check fragment sizes of WbbC(with point mutation) plasmid

The following concentrations (in ng/µL) was obtained:

o WbbC(with point mutation) - 181.6.

Gel Electrophoresis showed that WbbC(with point mutation) did not work because whilst there was a band, it was the wrong size (expected: 1113bp). This procedure was repeated again. Lane 1 = DNA hyperladder, Lane 2 = Mini-prepped WbbC.

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