Team:UC Berkeley/Protocols

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Revision as of 18:24, 17 June 2008

A. PCR (25ul) or Wobble PCR (50ul)

PCR (25ul)
1. Mastermix: 20.375 ul water, 0.5ul 10mM dNTP, 2.5 ul 10x Buffer 2, 0.375 ul Expand Polymerase 1.
  1. Aliquot 23.75 ul into each tube.
2. Add 0.5ul Oligo 1 (10uM), 0.5ul Oligo 2 (10uM), 0.25 ul template DNA.
3. Load into thermocycler. Note: small holes are for 0.2 ul tube and big holes for 0.5 ul to maximize contact

4. Select the program (55/45 if under 1kb, 2K55/2K45 for 1kb to 2kb, 4K55/45 for 2kb to 4kb, 8K55/45 if over 4kb)

II. Wobble PCR (50ul)

1. Mastermix: 40 ul water, 1.5 ul MgCl2, 5 ul buffer (Taq), 1 ul 10mM dNTP, 0.5 ul Taq Polymerase

a. Aliquot 48 ul into each tube

2. Add 1 ul 100 uM Oligo 1, 1 ul 100 uM Oligo 2.

3. Load into thermocycler.

4. Select the program WOBBLE55 or WOBBLE45 and run.

B. Isolation and Visualization of PCR Product

1. Label new tubes with the names of your samples for isolation.

2. Open a 0.8% CloneWell E-Gel. Only do this unless you are planning on running it in less than 15 min or it will dry out!

3. Place E-gel in apparatus (don't remove combs yet!) and do a PreRun for 2 minutes.

4. Remove combs and add about 25 ul of water to all cloning wells, 10 ul of ladder (GeneRuler, 1kb DNA Ladder) to the M lane, and 25 ul of your PCR products to each well. If you have fewer than 8 samples, try not to use the two outer lanes (1 and 8) since they tend to dry out/distort the DNA, and the water in these clone wells evaporated extremely quickly. Also, fill any unused lanes with 25 ul of water.

5. Select Run CloneWell and hit Go. After about 1 minute, turn on the blue light and view the gel through the orange shield; you should see small, bright bands under your sample lanes. Every couple minutes, check to make sure the clone wells are still filled with water.

6. Allow the bands to run until they reach the tiny horizontal scratches just above the clone wells. At this point, hit Go to stop the gel from running. Completely fill all clone wells with water and prepare for extraction.

7. Hit Go to start again and watch until the band has mostly entered the clone well and water. Hit Go again to stop the gel.

8. Extract the water/sample from the clone well with a pipette and transfer to appropriately-labeled new tube. If you miss your sample and it has continued on past your clone well, you can stop the program and select a reverse run to get it back, but avoid doing this if you can

9. Go ahead and freeze your samples if you don't plan on doing a digestion immediately.

C. Digestion (w/o DpnI)

1. Combine 5 ul NEB2, x ul of your DNA samples from the CloneWell, 1 ul EcoRI, 1 ul BamHI, (43-x) ul water. It's usually safe to assume you'll have at least 15 ul of any given sample extracted from the E-gel, so if you have many samples make a master mix in which there are 15 ul of DNA sample and 28 ul of water and multiply accordingly depending on the number of samples you have.

2. Incubate at 37 C for one hour.

D. Clean-up with Zymo Columns

I. Products Greater Than 300 bp

1. Label each Zymo column and fresh Eppendorf tubes with the appropriate names of your samples.

2. Add 200ul ADB buffer to each of the digestion samples, mix and pipette into zymo columns. Spin for 30 sec at full speed to pass the liquid through the column.

3. Empty collection tubes and put back onto the columns. Wash with 200 ul wash buffer and again spin for 30 sec at full speed. This will dissolve any extra guanidinium chloride and salts sitting on the membrane

4. Repeat the wash buffer step 3. Now nothing is present on the membrane but the DNA and a little ethanol and water

5. Now spin the column for 90 sec at full speed to remove all traces of water/ethanol.

6. Empty and discard the collection tube. Replace each collection tube with the appropriately-labeled fresh Eppendorf tubes.

7. Add 6 ul of water directly to each of the membranes of the Zymo columns, and spin for 45 sec to elute the DNA into your fresh Eppendorf tubes.

II. Products Between 20 and 300 bp

1. Add 1 volume equivalent of Zymo ADB buffer to each reaction. Vortex to mix.

2. Add 5 volumes of 95% ethanol (under fume hood, labeled flammable). Vortex to mix. The remaining steps are just like a normal Zymo clean-up reaction

1. Label each Zymo column and fresh Eppendorf tubes with the appropriate names of your samples.

2. Transfer your reaction mixtures into Zymo columns. Spin for 30 sec at full speed to pass the liquid through the column.

3. Empty collection tubes and put back onto the columns. Wash with 200 ul wash buffer and again spin for 30 sec at full speed. This will dissolve any extra guanidinium chloride and salts sitting on the membrane

4. Repeat the wash buffer step 3. Now nothing is present on the membrane but the DNA and a little ethanol and water

5. Now spin the column for 90 sec at full speed to remove all traces of water/ethanol.

6. Empty and discard the collection tube. Replace each collection tube with the appropriately-labeled fresh Eppendorf tubes.

7. Add 6 ul of water directly to each of the membranes of the Zymo columns, and spin for 45 sec to elute the DNA into your fresh Eppendorf tubes.

E. Ligation

1. Mastermix: 6.5 ul water, 1 ul ligation buffer, 0.5 T4 DNA ligase, 1 ul pBca1256 digested with EcoRI and BamHI. ::2. Aliquot 9 ul into fresh tubes.

3. Add 1 ul of your insert.

4. Cover with foil and incubate for 30 min at room temperature.

F. Transformation (always keep on ice)

I. Transformation from Ligation Reaction

1. Retrieve your competent cells from the -80 (on the third shelf) and thaw on ice. There are 220 ul of competent cells in each tube

2. Add 30 ul cold KCM and 20 ul cold water to each tube of competent cells. Invert ~2x to mix.

3. Take the top of an empty pipette tip box, add ice and water. Cut out the appropriate amount of tubes from the sets of attached tubes and float them in this ice bath. Do NOT let any water get into the tubes or else you will have to start over due to possible contamination!

4. Combine 45 ul of your cells into 10 ul of your ligation rxn while remembering to keep all tubes on ice. Swirl and pipette up and down once to mix.

5. Foil all tubes and incubate 10 min in ice-water.

6. Heat shock your cells by placing them in a 42 C water bath for 90 sec.

7. Remove and incubate on ice for 2 min.

8. Rub ethanol/flame top of foil to sterilize. Add 50 ul of LB 2YT to each tube by poking holes through the foil with your pipette tips.

9. Re-cover all tubes with foil and incubate at 37 C for 1 hour.

10. Plate using the sterilized glass-bead method or with standard spreaders.

II. Transformation from Mini-prep