Protocols

From 2008.igem.org

Revision as of 01:52, 14 June 2008 by Molly (Talk | contribs)

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

I. PCR (25ul)
1. Mastermix: 20.375 ul water, 0.5ul 10mM dNTP, 2.5 ul 10x Buffer 2, 0.375 ul Expand Polymerase 1.
a. 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

I. Label new tubes with the names of your samples for isolation.
II. 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!
III. Place E-gel in apparatus (don't remove combs yet!) and do a PreRun for 2 minutes.
IV. 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.
V. 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.
VI. 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.
VII. 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.
VIII. 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
IX. 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, 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 digestion with zymo columns.

1. Add 200ul ADB buffer to each of the digestion samples and pipette into zymo columns. Spin at 15s at full speed.
2. Add 200ul wash buffer. Spin for 15s at full speed.
3. Repeat step 2. Spin for an additional 90s at full speed.
4. Add 7ul of water to tube and spin for 30s at full speed.

E. Ligation

1. Mastermix: 6.5ul water, 1ul ligation buffer, 0.5 T4 DNA ligase, 1ul pBca1256. Aliquot 9ul.
2. Add 1ul of insert.
3. Cover with foil and incubate for 30 min at room temperature.

F. Transformation (always keep on ice)

1. 220ul competent cell in one tube. Thaw on ice.
2. Add 30ul KCM and 20 ul water (both cold) to each tube of competent cells.
3. Invert 2x to mix.
4. Aliquot 45ul cell into 10 ul of ligation rxn. Swirl and pipette up and down once to mix.
5. Foil all tubes and incubate 10 min in ice-water.
6. Heat shock 90 sec at 42 C.
7. Incubate on ice for 2 min.
8. Rub ethanol and flame top of foil to sterilize. Add 50 ul of LB to each tube by poking holes into each tube with pipette tips.
9. Re-cover all tubes with foil.
9. Incubate for 1 hr at 37 C.
10. Plate
Retrieved from "http://2008.igem.org/Protocols"