Overnight growth check
Great! All four bottles grew well and remained intact.
Glycerol stock
After the previous day mistake - the first thing to be done was to take a glycerol stock from each tube and label accordingly.
For each bottle I prepared stock as follows:
- 700µl broth with growth
- pUA66katE#A1#1
- pUA66katE#A1#2
- pUA66katE#A1#3
- pUA66katE#A1#4
- 300µl 50% Glycerol
- Store at -80ºC
Miniprep
After taking the stock I then moved onto centrifuging the bottles to extract the plasmids
- Spin all bottles for 10 minutes in centrifuge
- Discard supernatant
- Place the bottles in an icebucket for miniprep
For each of the bottles:
- Resuspend in 500µl cold P1 buffer
- Distribute 250µl in two eppendorf tubes
- For each tube add 250µl P2 Lysis buffer and wait 4 minutes
- Add 350µl N3 neutralisation buffer
- Centrifuge at 13,000 rpm for 10 minutes
- Apply the first tube to a QIAgen Quick column
- Centrifuge for 1 minute at 13,000 rpm and discard flow-through
- Apply the second tube to the column
- Centrifuge for 1 minute at 13,000 rpm and discard flow-through, all the plasmids is now bound to the column
- For each column add 500µl PB wash buffer
- Centrifuge for 1 minute at 13,000 rpm and discard flow-through
- For each column add 750µl PE with Ethanol final wash buffer
- Centrifuge for 1 minute at 13,000 rpm and discard flow-through
- Centrifuge for an additional minute at 13,000 rpm and discard flow-through
- Place columns in each labelled Eppendorf tubes
- Add 30µl of water to the centre of the column and wait for 1 minutes
- Centrifuge for 1 minute at 13,000 rpm to elute plasmid
- Store plasmids in an icebucket (or in the freezer at-20ºC)
Digestion
With the plasmids ready, I moved straight onto a double digestion.
Master mix: (total volume of 80µl)
- 2µl 100xBSA Buffer
- 20µl 10xNEB#Buffer
- 4µl XhoI
- 4µl BamHI
- 50µl water
Reaction: (total volume of 50µl each)
- Aliquot 20µl into each tube of 30µl DNA
- Incubate for 2 hours at 37ºC
Gel Purification p67
The products were then purified using a QIAgen Gel Extraction Kit and eluted in 30µl water.
- Add 1:3 Volume QG Buffer
- p67, 480µl
- Place in 47ºC water bath for 10 minute, mix ever 2 minute to dissolve gel
- Add 1:1 Volume Isopropanol
- p67, 160µl
- Apply each tube to a separate column
- Centrifuge for 1 minute at 13,000 rpm, discard supernatant
- Apply remainder ( it was getting a bit full) for each tube to each related column
- Centrifuge for 1 minute at 13,000 rpm, discard supernatant
- Add 500µl QG Buffer
- Centrifuge for 1 minute at 13,000 rpm, discard supernatant
- Add 750µl PE Final wash with Ethanol
- Centrifuge for 1 minute at 13,000 rpm, discard supernatant
- Centrifuge for an additional minute at 13,000 rpm, discard supernatant
- Place columns in labelled eppendorf tubes
- Apply 30µl water to the center of each columns and wait for 1 minute
- To elute, centrifuge for 1 minute at 13,000 rpm and keep tube
2% Gel of Digestion
I could now rescreen all the colonies from pUA66katE#A1 digestions on a 2% gel
Gel 2%
- Add 1.2g Agarose powder
- Add 60ml 1XTAE
- Heat in microwave until no specs and cool
- Add 2µl Ethidium Bromide
- Pour in prepared tray
Loading:
- Lane 1: 10µl, 100bp NEB Ladder
- Lane 2: 2µl, p67, XhoI/BamHI, purified
- Lane 3: Blank
- Lane 4: 50µl, pUA66katE#A1#4, XhoI/BamHI
- Lane 5: 50µl, pUA66katE#A1#3, XhoI/BamHI
- Lane 6: 50µl, pUA66katE#A1#2, XhoI/BamHI
- Lane 7: 50µl, pUA66katE#A1#1, XhoI/BamHI
- Lane 8: Blank
Gel Picture:
Analysis: Lane 6, containing sample pUA66katE#A1#2 contains the insert!!!
Transformations from overnight ligation
This was a transformation using the overnight ligation (4 SAP and 2 standard)
Before:
- Preheat 1ml SOC in incubator 37ºC
- Place 6 Kanamycin plates in incubator 37ºC to dry
- Label plates
Procedure:
- Collect 6 tubes of 50µl XL1-Blue competent cells from -80ºC and place on ice
- Keep on ice for 5 minutes
- For each tube of cells, label and add one of the reaction (std ligation and sap ligation)
- Keep on ice for another 5 minutes
- Place in a 42ºC water bath for 1 minute
- Place back on ice for 5 minutes
- Add 250µl of SOC for each bottle
- Incubate in shaker at 37ºC for 15 minutes
- For each bottle apply the liquid to the centre of the plate and spread using glassbeads
- Incubate overnight at 37ºC
Ligation p67
I setup a quick reactions in a standard ligation 1:7
- 1µl Ligation Buffer
- 1µl T4
- 1µl p67 XhoI/BamHI
- 7µl katE XhoI/BamHI
- Incubated for 1 hour at 37ºC
Transformation p67
This was a transformation using the quick ligation of p67
Before:
- Preheat 1ml SOC in incubator 37ºC
- Place 1 Kanamycin plate in incubator 37ºC to dry
- Label plate
Procedure:
- Collect 1 tube of 50µl XL1-Blue competent cells from -80ºC and place on ice
- Keep on ice for 5 minutes
- Add all of the p67 ligation reaction
- Keep on ice for another 5 minutes
- Place in a 42ºC water bath for 1 minute
- Place back on ice for 5 minutes
- Add 250µl of SOC for each bottle
- Incubate in shaker at 37ºC for 15 minutes
- For each bottle apply the liquid to the centre of the plate and spread using glassbeads
- Incubate overnight at 37ºC
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