User:Tamra L. Fisher/Notebook/Research for Dr. Hartings/2012/06/22: Difference between revisions

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==Continuing Wildtype Hemoglobin Expression=
==Continuing Wildtype Hemoglobin Expression==
# Centrifuge cultures grown overnight at 4500rpm at 4°C for 15 minutes.
# Centrifuge cultures grown overnight at 4500rpm at 4°C for 15 minutes.
# Resuspend each pellet in 1mL of LB.
# Resuspend each pellet in 1mL of LB.

Revision as of 07:58, 22 June 2012

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Continuing Wildtype Hemoglobin Expression

  1. Centrifuge cultures grown overnight at 4500rpm at 4°C for 15 minutes.
  2. Resuspend each pellet in 1mL of LB.
  3. Add each pellet to 1L of LB with 100μg/mL of ampicillin.
  4. Incubate at 37°C at 250rpm until OD600 = 0.6

Miniprep Growths

None of the cultures started for the minipreps had any growth last night (the "colonies" were very small). This means no minipreps will be done today. Two colonies did however appear on the NovaBlue + M103S transformation plate from two days ago. The plate was just left at room temperature overnight.

DNA ligation with T4 DNA Ligase

This will be done with both the wildtype Asc Hb double-digested insert and the M8S/M33S/M103S Asc Hb double-digested insert. The procedure is based off of the protocol on the NEB website.

  1. Mix 2μL of 10x T4 DNA Ligase Buffer, 5μL of the double-digested pQE-80-L-Kan vector, 10μL of the wildtype insert, 2μL of nuclease free H2O, and 1μL of T4 DNA Ligase.
  2. Mix 2μL of 10x T4 DNA Ligase Buffer, 5μL of the double-digested pQE-80-L-Kan vector, 6μL of the triple mutant insert, 6μL of nuclease free H2O, and 1μL of T4 DNA Ligase.
  3. Place at room temperature for 10 minutes.
  4. Place on ice.

My calculations yesterday led me to a 5:1 volume ratio, but I thought about it again and here is my reasoning for for today for a 3:1 insert to vector molar ratio:

  • Since the vector is about 4700bp and the insert is about 450bp, then the molecular weight of the vector is probably about 10 times bigger than the molecular weight of the insert.
  • I then reasoned that the molarity ratio for the wildtype insert to the vector was about 1.5:1 because of the concentration calculated and the relative molecular weights.
    • This seems to mean that the ratio of volumes for insert to vector should be 2:1 for the wildtype insert
  • I also reasoned that the molarity ratio for the triple mutant insert to the vector was about 2.6:1.
  • I could basically stay close to a 1:1 ratio for the volume ratio, but the real volume ratio would be about 1.15:1
  • I was also aiming for about 50ng of each, but since the molar ratio seems to be most important, I will only aim for 50ng of the vector. This means there will be more vector than insert in terms of mass, but not molarity.

Running an Analytical DNA Gel

  1. Make a 1.2% agarose gel (0.3g agarose + 25mL TAE buffer, microwave until boiling, then pour into gel chamber, and place comb for wells).
  2. When the gel has solidified, add TAE buffer to the chamber until the gel is completely submerged in buffer.
  3. Load 5μL of DNA ladder into the 1st well.
  4. Load 5μL of the M8S/M33S/M103S/A71M/L40M PCR product from yesterday with 1μL 6x loading buffer into the 3rd well (mix before pipetting into well).
  5. Load 5μL of the wild-type Asc Hb and pQE-80-L-Kan ligation from this morning with 1μL 6x loading buffer into the 5th well (mix before pipetting into well).
  6. Load 5μL of the triple mutant (M8S/M33S/M103S) Asc Hb and pQE-80-L-Kan ligation from this morning with 0.5μL 6x loading buffer into the 7th well (mix before pipetting into well).
  7. Run the gel at 100V until the "dye line" has moved about 3/4 of the way down the gel
  8. Place the gel in Ethidium Bromide Stain for about 30 minutes
  9. Move the gel to TAE buffer to destain for about 20 minutes
  10. View under a UV light
    • Be careful when working with ethidium bromide and UV light.

Transformations

  1. Place plastic culture tubes on ice for about 15 min.
  2. Place DNA for transformation on ice.
  3. After DNA has thawed, place cells on ice. (Note - want to minimize the time that the cells are out of freezer and on ice).
  4. Add 1, 2, or 3uL of DNA to the appropriately labeled culture tube and let sit in ice for 1 minute.
  5. Add cells (30uL, 40uL, or 50uL) to the tube on top of the DNA and gently pipette up and down to mix cells and DNA.
  6. Put tube back in ice for 4 minutes.
  7. Heat shock at 42°C for 80 seconds.
  8. Add 100uL of SOC media.
  9. Shake at 37°C for 1 hour.
  10. Plate 50uL of culture media on LB/amp plates (prepared yesterday: 6.25g LB (w/o NaCl) + 2.5g NaCl + 5g agar + 250mL dH2O, autoclave liquid cycle, cool to about 60°C, add 250μL 100mg/mL amicillin, pour plate, store at 4°C).
  11. Incubate inverted overnight at 37°C.



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