Difference between revisions of "Team:Macquarie Australia/Experiment"
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Revision as of 03:19, 27 September 2017
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Protocols
Preparation of E. coli
- Using a sterile plastic loop, pick 10-12 large (2-3mm in diameter) colonies from the plate. Inoculate to 150mL of SOB medium in a 1L flask, and grow overnight at 18-22C, 200-250rpm. Alternatively, set up a starter culture (2ml) overnight and inoculate the large scale in the morning. Grow at 37 C.
- A600 should be 0.2-0.8 when harvest. Preferably, cells should be in mid log phase with A600 ~ 0.5
- Remove the flask from the incubator and place on ice for 10 minutes. FROM THIS STEP, KEEP THE CELLS ON ICE AS MUCH AS POSSIBLE!
- Transfer the culture to a 15mL centrifuge tube and spin at 2500 x g for 10 min at 4C
- Pour off and discard the supernatant, and immediately place the tube on ice.
- Resuspend your cells in 1mL of ice-cold TB buffer, make sure there are no clumps of cells left, but also treat your cells gently and keep them cold.
- Add ice-cold TB buffer to bring volume up to 1/5th of the original culture volume (~30mL in this case). Mix the tube by gently inverting 3 times.
- Incubate the tube on ice for 10 minutes.
- Centrifuge at 2,500 x g for 7 minutes at 4C, discard the supernatant.
- Gently resuspend the cells in ~1/20th of the original culture volume of ice-cold TB buffer. NOTE: 1/20th is based on and OD600 of 0.5, so adjust volume accordingly. E.g. if the culture OD600 was 0.1 then resuspend in 1/100th of original volume.
- Pre-chill 1.5ml Eppendorf tubes on ice. Add 930µl of your cell suspension, keeping the remainder on ice in the 15mL tube.
- Add 70µl of DMSO to the 930µl of cell suspension. Mix gently by swirling, and place on ice.
- Aliquot 100µl of the competent cell/DMSO mixture into fresh microcentrifuge tubes. Label the tubes with: Date – Strain. Snap freeze with liquid nitrogen or dry ice. Store cells at -80oC.
- Obtain competent cells from -80oC.
- Defrost, then return on ice immediately. Always keep cells on ice up till Step 4. Pipette 50µl for each transformation. If you have 100ul aliquot, split into 2 tubes.
- Add 2µl of plasmid DNA/ ligation mix to each tube. Incubate on ice for 10-15 min.
- Heat shock in 42oC in block (or hot water in beaker with thermometer) for 45 seconds, then back on ice for 2 min.
- Recovery- Add 500µl of SOC media to each tube, and incubate in the 37oC shaker for 90 min and shaking 500 rpm (recovery- 30min for plasmid or 90min for ligation mix).
- For each tube of cells, spread 20µl onto one LB plate with appropriate antibiotic, and 200µl onto a second plate, using aseptic technique. (Since colony counts have been so low we are currently only plating the 200µl.) Remember to label your plate properly (Your name, sample name, cell line, antibiotic, date)
- Leave plates (with lid on) on bench or 37 C incubator to dry out before sealing with parafilm (or use cling wrap for multiple plates). Place your plate upside-down in the 37oC incubator.
BioBrick Transformation
- Harvest cells- Reserving 500 uL of culture for glycerol stock the remainder can be used for miniprep. Overnight culture - centrifuge 1 min to pellet cells. (Pour off supernatant and centrifuge more in the same tube. Keep quantities equal across your tubes to aid centrifuge balance. It is unnecessary to use all culture).
- Resuspend- 200 µL (this solution is refrigerated due to RNase).
- Lyse- 200 µL (gentle inversions < 5min) followed by precipitate/neutralize- 350 µL (gentle inversions).
- Centrifuge- 10 min (to pellet debris).
- Prepare columns- (cut lids off and label columns) 500 µL (column prep solution) - centrifuge 1 min.
- Collect DNA- pass lysate through column - centrifuge 1 min.
- Wash columns 750 µL - centrifuge 45 s (discard flow through) and centrifuge another 90 s.
- Elute DNA into labelled Eppendorf tubes. 30 µL - centrifuge 1 min. Retaining the elution and centrifuge through a 2nd time collects more DNA.
- Nanodrop to determine DNA concentration and label accordingly. (Use Miniprep elution solution as blank).
E. coli Hydrogen Production
| Ingredient | Volume |
|---|---|
| M9 Minimal salt (5X) | 100 mL |
| RO water | 400 mL |
Autoclave then add the following filter sterilised ingredients:
| Trace Elements | 5 mL |
| 1M MgSO4 | 0.5 mL |
| 1M CaCl2 | 0.05 mL |
| 1M MgSO4 | 0.5 mL |
| 20% cas amino acid | 2.5 mL |
| 0.2 M Fe(NH4)SO4 | 125 uL |
| 2% Thiamine | 125 uL |
Top up to 500 mL with Sterile Milli-Q H2O.
- Add 2 mL of M9 media to a 15 mL tube with a colony of transformed E. coli for an overnight culture, 37C and shaking.
- Measure the OD600 and dilute to get an OD of 0.1.
- Grow cells up to OD600 0.5.
- Induce with IPTG (1:1000) and add 20 mM glucose.
- Grow anaerobically for 4 hours.
- Add 2 mL of induced culture to cell.
- Close tightly with plunger.
- Leave electrode to measure for 48 hours.
