Team:NRP-UEA-Norwich/Protocol

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NRP UEA iGEM 2012

 

Welcome to the NRP UEA iGEM 2012 Wiki Lab Book

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Week Zero | Week One | Week Two | Week Three | Week Four | Week Five | Week Six | Week Seven | Week Eight | Week Nine | Week Ten | Week Eleven | Lab Protocols | Experiments


Contents

Lab Protocols

Hydrating Dry DNA (synthesised DNA)

1) The dry form synthesised DNA was centrifuged for 1min at 14500 rpm.

2) To these tubes, 20 µL of sterilised water was added.

3) These tubes were vortexed briefly (30secs) and centrifuged briefly (20secs).

4) These were then placed in ice.

Inoculations

1. To 5ml samples of sterilised LB broth antibiotics were added. Ampicillin was added at 500 μl and chlorophenicol was added at 3.75ml.

2. To each of these broths, E.coli colonies growing on plates was inoculated.

Isolating DNA

(Using Bioloine ISOLATE Plasmid DNA Mini Kit and following the given instructions for low copy plasmids) 1) The culture was centrifuged at max. speed for 1 min to obtain a cell pellet.

2) The supernatant was discarded and the pellet resuspended with 500 µL of Resuspension Buffer using a vortex mixer.

3) To the sample, 500 µL of Lysis Buffer P was added and mixed by inversion.

4) An aquilot of 600 µL of Neutralisation Buffer was added and the sample inverted.

5) To obtain a cell debris pellet the solution was spun at max. speed for 10 mins and the supernatant transferred to a collection tube.

6) After 1 min of centrifugation at max. speed the filtrate was discarded and 500 µL of Wash Buffer AP was added.

7) Another round of centrifugation at max. speed for 1 min was followed by the discard of the filtrate and the addition of 700 µL Wash Buffer solution.

8) The sample was centrifuged at max speed for 2 mins and the spin column placed in a elution tube.

9) To the tube 100 µL of Elution Buffer was added and the sample incubated at room temperature for 1 min.

10) The isolated DNA was stored in eppendorf tubes and refrigerated at 4 ºC for later use.

LB Media

1) To a mixture of NaCl (5g), tryptone (5g) and yeast extract (2.5g), 250ml of distilled water was added and mixed in well. 2) An additional 250ml of distilled water was added.

3) This was heated till boiling.

4) The media was then transferred into culture flasks (5.5ml each) with the lids partially closed.

5) These were autoclaved at 121ᵒC, 15psi for 10mins.


Potassium nitrate solution (1M stock solution)

1) 20.2g of potassium nitrate was dissolved in distilled water.

2) The dissolved solution was made up to 200ml.

3) This was autoclaved at 121ᵒC, 15psi for 10mins.

Transformation

1) Competent cells were thawed on ice for 15mins

2) Into pre-chilled 2ml tubes, 50 µL competent thawed cells and 2µL of re-suspended DNA were added and mixed through flicking.

3) These were put back into ice and left for 30mins.

4) From the ice, the tubes were taken and immersed in a 42 ºC water bath for 1 min.

5) After heat shocking, cells were incubated on ice for 5mins.

6) To these cells, 200 µL of pre-warmed LB broth (37 ºC) was added.

7) Cells were then incubated at 37 ºC for 2 hours and shaken every 5mins

8) From each tube two inoculations were made. 1) 20 µL of cells plus 180 µL of LB on chlorophenical LB agar plates, 2) 200 µL of cells. Agar plates contain chlorophenicol at a concentration of 50µg/ml.

9) These were incubated for 17 hours at 37 ºC.