Team:SDU-Denmark/Protocols

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Protocol for Primer PCR

dNTP mix (10mM)

10ul 100mM dGTP

10ul 100mM dATP

10ul 100mM dTTP

10ul 100mM dCTP

60ul H2O

(Total V=100ul)


PCR reaction

39ul H2O

5.0ul Pfx-buffer (÷MgSO4)

1.0ul 50mM MgSO4

1.5ul 10mM dNTP mix

1.5ul forward primer

1.5ul reverse primer

0.5ul Pfx enzyme (add ju1st before PCR run)

PCR program

For PCR of BioBricks:

1. Start 94˚C 2min
2. Denaturing 94˚C 1min
3. Annealing 52˚C 1min
4. Elongering 68˚C 2min
5. GOTO 2 rep. 29x
6. Slut 68˚C 3min
7. Hold 4˚C


Protocol for colony PCR

• A little colony is transfered to each tube (+ afterwards the same tip is use fore plading out on a LA+Amp plate)

• The tubes is placed in the microwave at full power fore 2 min with an open lid.

• 25 μl Pre-mix (with taq-pol) is added to the PCR tubes. Mix weel by pipetting up/down.

Pre-mix (to 1 colony)

2,5 μl 10 x taq. Buffer + MgCl2

1,25 μl 10 pmol/μl forward primer

1,25 μl 10 pmol/μl reverse primer

0,50 μl dNTP

19,25 μl H2O

0,25 μl Taq. Pol → Pre-mix is mad without taq pol. When the colonis has been zapped in the microwave,

=25 μl taq . pol is added to the pre-mix → PCR-tube

Make enough premix for your number of colonies + 3

PCR program

1. Start 94˚C 2min
2. Denaturing 94˚C 1min
3. Annealing 52˚C 1min
4. Elongering 72˚C 2min
5. GOTO 2 rep. 29x
6. Slut 72˚C 3min
7. Hold 4˚C

Protocol for purification of DNA from TAE and TBE agarose gel bands

Kit from GFX

Sample capture

  1. Weigh a DNase-free 1,5 ml microcentrifuge tube
  2. Excise band of interest from the gel and place in microcentrifuge tube
  3. Weigh microcentrifuge tube plus agarose gel band
  4. Calculate weight of agarose gel slice
  5. Add 10 ul Capture buffer type 2 for each 10 mg agarose gel slice
  6. Mix by inversion
  7. Place at 60 degrees until agarose is completely dissolved

Sample binding

  1. Add up to 600 ul Capture buffer-sample mix to assembled GFX MicroSpin columns and Collection tubes.
  2. Leave at room temperature for 60 sec.
  3. Centrifuge for 30 sec at 16000 g.
  4. Discard the flow through in the Collection tube and place the MicroSpin column in the Collection tube again.
  5. Repeat sample binding step until all sample is loaded onto the MicroSpin column.

Wash & dry

  1. Add 500 ul Wash buffer type 1
  2. Centrifuge for 30 sec at 16000 g.
  3. Discard flow through and keep Collection tube as above.
  4. Centrifuge again for 30 sec at 16000 g. More flow through will appear in the Collection tube. It is important to centrifuge this second time to get the sample completely dry. This step is not provided in the original protocol.
  5. Discard Collection tube and transfer MicroSpin column to a clean 1,5 ml DNase-free microcentrifuge tube.

Elution

  1. Add 10 – 50 ul Elution buffer type 4 or 6. We eluted with 10 ul in order to obtain a small volume and a high concentration of purified DNA. Only very big amounts of sample require higher elution volumes.
  2. Leave at room temperature for 60 sec.
  3. Centrifuge for 60 sec at 16000 g.
  4. Retain flow through and discard MicroSpin columns
  5. Store purified sample DNA at -20 degrees or proceed to cutting DNA or ligation.

Protocol for purification of DNA from PCR mixtures or an enzymatic reaction

Kit from GFX

Sample capture

  1. Add 500 ul Capture buffer type 2 to up to 100 ul sample
  2. Mix thoroughly

Sample binding

  1. Add Capture buffer-sample mix to assembled GFX MicroSpin columns and Collection tubes
  2. Centrifuge for 30 sec at 16000 g.
  3. Discard the flow through in the Collection tube and place the MicroSpin column in the Collection tube again.

Wash & dry

  1. Add 500 ul Wash buffer type 1
  2. Centrifuge for 30 sec at 16000 g.
  3. Discard flow through and keep Collection tube as above.
  4. Centrifuge again for 30 sec at 16000 g. More flow through will appear in the Collection tube. It is important to centrifuge this second time to get the sample completely dry. This step is not provided in the original protocol.
  5. Discard Collection tube and transfer MicroSpin column to a clean 1,5 ml DNase-free microcentrifuge tube.

Elution

  1. Add 10 – 50 ul Elution buffer type 4 or 6. We eluted with 10 ul in order to obtain a small volume and a high concentration of purified DNA. Only very big amounts of sample require higher elution volumes.
  2. Leave at room temperature for 60 sec.
  3. Centrifuge for 60 sec at 16000 g.
  4. Retain flow through and discard MicroSpin columns
  5. Store purified sample DNA at -20 degrees or proceed to cutting DNA or ligation.

Protocol for making cells (E.coli) competent for transformation

(Cells are kept on ice at all times!! If the cells temperature rises above ~5º C they'll lose their competency!)

  1. 600 µl overnight (ON) Top10 E. coli culture is added to 60 ml Luria-Bertani (LB) medium.
  2. Grows at 37º C while being shaken until the optic density (OD550) is 0,2.
  3. Cool cells on ice.
  4. Harvest the cells in screwcap tubes (4 × 10 ml).
  5. Pour away the supernatant and keep the pellet on ice.
  6. Wash the cells with 10 ml cold 50mM CaCl2.
  7. The cells are being distributed in eppendorf tubes of 200 µl.
  8. Add 41.7 µl 87% glycerol and mix well.
  9. Store at -80º C.

Protocol for making cells (E. coli) competent for electroporation

(Cells are kept on ice at all times!! If the cells temperature rises above ~5º C they'll lose their competency!)

  1. 2ml over-night cell culture is transferred to 200ml Luria Bertani (LB)-medium.
  2. Incubate at 37˚C on shaker until OD450=0.5-0.7
  3. Keep on ice for 15-30min and harvest by 4000 x g for 15 min at 4˚C.
  4. Remove all supernatant and resuspend carefully in 200ml ice cold dH2O. Harvest as in 3.
  5. Resuspend in 100ml ice cold dH2O. Harvest as in 3.
  6. Resuspend in 20ml ice cold 10% glycerol. Harvest as in 3.
  7. Resuspend in ice cold 10% glycerol until a total volume of 1ml. Cell concentration should be 1-3x1010 cells/ml.
  8. Cells are distributed in tubes with 40ul in each and kept at -80˚C.

Protocol for transforming (E.coli)

  1. Take 2 and 5 µl of the plasmid from the distribution plates and add it to 2 different tubes with 50 µl competent cells in each. As controls use 1 tube with competent cells only (control of the cells) and 1 tube with puc plasmid which is supercoiled and known to work (control of our plasmid).
  2. Store on ice for 40 min.
  3. Keep at 42º C for 2 min.
  4. Keep on ice for 5 min.
  5. Add 1 ml LB to each tube.
  6. The tubes are stored at 37 º C for 2 hours while being shaken.
  7. Centrifuge the tubes at 3500 rounds pr. minute for 5 min.
  8. Suck up and throw out 850 µl and resuspend the remaining by pipetting up and down.
  9. Spread out 75 µl on 2 LA (LB + agarose) plates with antibiotics (100 µg/ml ampicillin). The competent cells of the controle are spread out on 1 LA plate with antibiotics and 1 without, since they are not resistant.
  10. Store at 37 º C over night.


Electroporation

This protocol is very useful compared to standard-transformation, because it uses the power of ZAP! Requires less raw material than a normal transformation and is faster.

  1. Thaw competent cells at room temperature and then keep on ice. 0.2cm cuvettes for electroporation are cooled on ice.
  2. For each transformation, transfer 40ul cells to a 1.5ml Eppendorf tube and add 1.5ul plasmid from distribution plates. Mix well and transfer to the bottom of a cuvette without making air bubbles. Keep on ice for 5min.
  3. Place the cuvette in the electroporator and pulse once. Setup: Gene pulser: 25uF 2.5kV Pulse controller: 200ohm
  4. Immediately add 1ml SOC medium to the cuvette, mix well by pipetting, and transfer to a 1.5ml Eppendorf tube and incubate immediately at 37˚C for 1h on shaker (500 rpm).
  5. Plate the transformed cells onto LA plates containing antibiotics (100 ug/ml ampicillin). Untransformed cells (negative control) should be plated with and without antibiotics.

Miniprep protocol

We used BIO-RAD Quantum Prep, Plasmid Miniprep Kit.

All centrifugation steps are performed at maximum speed (12.000-14.000 g = 14.000 rpm).

  1. Transfer an ON culture (2 mL) of plasmid containing cells to a microcentifuge tube. Pellet the cells by centrifugation for 30 sec. Remove all of the supernatant by aspirirating or pipetting.
  2. Add 200 µl of the Cell Resuspension Solution and vortex or pipet up and down until the cell pellet is completely resuspended.
  3. Add 250 µl of the Cell Lysis Solution and mix by gently inverting the capped tube about 10 times (do not vortex). The solution should become viscous and slightly clear if cell lysis has occurred.
  4. Add 250 µl of the Neutralization Solution and mix by gently inverting the capped tube about 10 times (do not vortex). A visible precipitate should form.
  5. Pellet the cell debris for 5 min in a microcentrifuge. A compact white debris pellet will form along the side or at the bottom of the tube. The supernatant (cleared lysate) at this step contains the plasmid DNA.
  6. While waiting for the centrifugation step at step 5, insert a Spin Filter into one of the 2 ml wash tubes supplied with the kit. Mix the Quantum Prep matrix by repeated shaking and inversion of the bottle to insure that it is completely suspended (no tubes are supplied with the sample kit, however, most 2 and 1,5 ml tubes will accommodate the Spin Filters).
  7. Transfer the cleared lysate (supernatant) from step 5 to a Spin Filter, add 200 µl of thoroughly suspended matrix, then pipet up and down to mix. If you have multiple samples, transfer the lysates first, then add matrix and mix. When matrix has been added to all samples and mixed, centrifuge for 30 sec.
  8. Remove the Spin Filter from the 2ml tube, discard the filtrate at the bottom of the tube and replace the filter in the same tube. Add 500µL of Wash Buffer and wash the matrix by centrifugation for 30 seconds.
  9. Remove the Spin Filter from 2 ml tube, discard the filtrate at the bottom of the tube and replace the filter in the same tube. Add 500 µL of Wash buffer and wash the matrix by centrifugation for a full 2 minutes to remove residual traces of ethanol.
  10. Remove the Spin Filter and sicard the microcentrifuge tube. Place the filter in on of the 1.5 mL collection tubes supplied with the kit or ay other standard 1.5 mL microcetrifuge tube which will accommodate the Spil Filter. Add 50 µL of deionized H2O. Elute the DNA by centrifugation for 1 minutes at top speed.
  11. Discard the Spin Filter and store DNA at -20 degress Celsius.

Restriction digest - Protocol 1

  1. Pool plasmid and dry on vacuum centrifuge down to about 50uL
  2. Mix the following into one tube:
    1. 4uL Plasmid and RIP
    2. 5uL 10x Buffer
    3. 0,5uL BSA
    4. Fill with water to 47uL (37,5uL)
    5. 1,5uL Enzyme 1
    6. 1,5uL Enzyme 2
  3. Incubate for 2 hours on 37 degress C.
  4. Inactivate the enzymes at 80 degress C for 20 minutes.
  5. Place product on -20 degress C or continue immediately to ligation.

Restriction digest - Protocol 2

  1. Fast digest restriction enzymes. Fast digest restriction enzymes have proved more efficient for cutting DNA, and is less time-consuming to work with. Fast Digest enzymes can be bought at Fermentas.
  2. 24 ul water
  3. 2 ul enzyme
  4. 4 ul Fast Digest buffer
  5. 10 ul PCR product
  6. Leave for 15 min at 37 degrees. Afterwards, inactivate the enzyme for 20 min at 80 degrees.

Be aware, only to cut with ONE enzyme at a time.

After cutting with enzyme 1, isolate and purify the DNA fragments on a gel before applying enzyme 2.

The final volume when cutting is 40 ul.

  1. Add 4 ul loading buffer to the eppendorf tube and load directly onto gel.
  2. Run gel and purify from gel.
  3. Eluate with 10 ul when purifying from gel.
  4. Eventually, place your sample in the vacuum centrifuge in order to get a smaller volume and greater concentration before ligation is applied. Final volume prior to ligation should be 5 ul.

Restriction digest - Protocol 3

Restriction protocol a la Anna.

Check that you have all the enzymes and prepare two gels.

  1. 2 ul PCR product
  2. 2 ul buffer (Green buffer)
  3. 1 ul Enzym 1
  4. 1 ul Enzym 2
  5. 14 ul H20

Mix the products gently together. Quick spin down. Hereafter 5 min. at 37 degrees, mildly shaken.

After 5 min. quickly load 15 ul in one gel (purification gel), and the remaining 5 ul in the other gel (test-gel). After 15-20 min. check the test-gel, print a picture, and cut out the correct band of the purification gel and purify using a miniprep.

Ligation - Protocol 1

Mix the following:

  1. 2uL 10x Ligase buffer
  2. 1uL T4 DNA ligase
  3. 2 or 4 uL cut backbone
  4. 5 or 10 uL cut PCR product

Leave at 17 degress C overnight.

Use for electroporation.

Ligation - Protocol 2

Takes place in eppendorf tube.

  1. 2 ul 10x T4 ligase buffer
  2. 1 ul T4 ligase
  3. 5 ul PCR product (cut) of each brick which is to be ligated together - or 1 part plasmid and 5 part bricks

Leave at 17 degrees over-night.

Test ligation using PCR and run a test gel afterwards in order to check the PCR product has the right size.

Ligation - Protocol 3

Use our plasmid ligation helper to calculate the volume of Plasmid and Insert to be mixed.

Mix cut Plasmid and cut Insert with the following:

  1. 2uL 10x Ligase buffer
  2. 1uL T4 DNA ligase

Leave at 17 degress C overnight.

Use for electroporation.

Protocol to Hot Phenol RNA Isolation

Solution 1: 0,3M sucrose; 0,01M NaAc, pH 4,5

Solution 2: 2% SDS; 0,01M NaAc, pH 4,5

Phenol saturated in 0,01-0,03M NaAc pH 4,5 containing 0,1% 8-hudroxyquinolin


I. 200 ml phenol + H2O (2cm water on top)

II. Add 0,2g 8-hudroxyquinolin

III. Add 6,66ml 3M NaAc pH4,5

IV. Shake, leave over night and in the end check pH of the water phase.


1. Resuspend frozen cell pellet in 300 µl ice cold solution 1 and transfer into a 1,5 ml microcentrifuge tube containing 300 µl solution 2. Proceed immediately with 2.

2. Add 400 µl Phenol, mix and incubate for more than 3 min. at 65˚C. When handling multiple samples these steps are repeated until all tubes are collected in the heating block. Snap Freeze in liquid nitrogen, 15s and spin at max speed for 5 min.

3. Transfer the water layer to a fresh 1,5 ml microcentifuge tube containing 600 µl hot phenol (it is important to avoid the organic phase in all steps). Mix and incubate for 3 min. at 65˚C. Snap Freeze in liquid nitrogen, 15s and spin at max speed for 5 min.

4. Transfer the water layer to a fresh 1,5 ml micorcentrifuge tube containing 300 µl phenol and 300 µl chloroform. Mix and spin.

5. Transfer the water layer to a fresh 1.5 ml microcentrifuge tube containing 40 µl 3M NaAc pH 4,5 + 900 µl 96% EtOH. Incubate at -20˚C for 15 min (or over night if required).

6. Centrifuge at 20.000g (14681 rpm, Eppendorf 5417R) for 20 min. At 4˚C.

7. Carefully remove the supernatant and wash the pellet with 200 µl ice cold 70% EtOH. Spin at 20.000 g for 5 min. at 4˚C.

8. Carefully remove the supernatant and dry the pallet for max. 10 min. in speed-vac.

9. Resuspend the pellet in 50 µl RNase-free H2O. spin again and transfer to a new tube.


Test of RNA

1. Mix. 2 µl RNA, 2 µl H2O and 2 µl formaid loading buffer.

2. Run on agarose gel.

3. Test concentration on nanodrop.





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