Difference between revisions of "Team:Paris Bettencourt/Notebook/VitaminA"

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<li>The cells where harvested by centrifugation at 3000g for 5 min and resuspended in 25 mL of water and centrifuged again 5 min at 3000g. The washing process was repeated again, then the cells were resuspended in 1.0 mL of sterile water.</li>
 
<li>The cells where harvested by centrifugation at 3000g for 5 min and resuspended in 25 mL of water and centrifuged again 5 min at 3000g. The washing process was repeated again, then the cells were resuspended in 1.0 mL of sterile water.</li>
 
<li>The suspension was transfered into a 1.5 mL eppendorf tube and centrifuged for 30s at 13,000g and the suppernatent discarded</li>
 
<li>The suspension was transfered into a 1.5 mL eppendorf tube and centrifuged for 30s at 13,000g and the suppernatent discarded</li>
<li>The cells were resuspended in 0.5 mL of sterile water. 100u L of <font color="red">to be finished</font></li>
+
<li>The cells were resuspended in 0.5 mL of sterile water. 100u L of <font color="red">tshed</font></li>
 
</ol>
 
</ol>
  

Revision as of 11:55, 25 July 2015

Jul. 14th

Goal

Extract the integrative plasmid HO-Poly-KanMX4-HO from the E.Coli provided by AddGene (Accession number #51662).

Procedure

  1. Liquid culture overnight in LB + Ampicillin.
  2. Made a glycerol stock and stored it in the -20 freezer (g15.35)
  3. Centrifuge the tube for 1 minute with 11000 rpm.
  4. Follow the standard protocol of Thermo Scientific miniprep kit (is it? I followed Ihab's protocol here: https://docs.google.com/document/d/1QHBHcN8RY0c-oEY8X5kAqPrKYODTBm7K8eU_lY_yw-o/edit, we should compare them)
  5. Measure concentration with Nanodrop

Results

Final DNA concentrations of the 4 tubes of miniprep, measured with Nanodrop:
  • tube HO pl. 1 = 431.1 ng/uL
  • tube HO pl. 2 = 313.6 ng/uL
  • tube HO pl. 3 = 366.4 ng/uL
  • tube HO pl. 4 = 261.7 ng/uL


Jul. 15th

Goal

Test chromosomal integration in WT yeast SK1 with the integrative plasmid HO-Poly-KanMX4-HO.

Procedure

We followed the method described in "High-efficiency Yeast transformation using liAc/SS carrier DNA/PEG method" (Gietz 2007).
  1. Inoculation of a single colony of the SK1 yeast strain in liquid YPD overnight on a rotatory shaker at 130 r.p.m and 30°C.
  2. After 16 hours the titer of the cell culture was determined. The OD 600 nm of a 1/100 dilution (10 uL in 1 mL) was measured and the cell concentration determined using the formula (1*10^6 cells.mL^-1 will give an OD600nm of 0.1).
  3. 2.5*10^8 cells were added to 50 mL of pre-warmed YPD and incubated for 4.5 hours at 30°C and 130 rpm.
  4. 1.0 mL of salmon sperm carrier DNA was denaturated in a heat block at 99°C during 5 min, and chilled rapidly in ice.
  5. The cells where harvested by centrifugation at 3000g for 5 min and resuspended in 25 mL of water and centrifuged again 5 min at 3000g. The washing process was repeated again, then the cells were resuspended in 1.0 mL of sterile water.
  6. The suspension was transfered into a 1.5 mL eppendorf tube and centrifuged for 30s at 13,000g and the suppernatent discarded
  7. The cells were resuspended in 0.5 mL of sterile water. 100u L of tshed

Results

We had many transformants, with the resistance marker:
[add photos]
we must not forget to mention the controls.


Jul. 22nd

Goal

Amplify gBlocks vA-2, vA-3, and vA-4, which form the last parts of the polycistron.

Procedure

Resuspend gBlocks and primers:
  • Resuspended gBlocks vA-2, vA-3 and vA-4 in 100 uL water, to reach a final concentration of 10 ng/uL.
  • Made aliquots of these gBlocks at concentration 1 ng/uL.
  • Resuspended primers o15.056, o15.076, o15.058, o15.059, o15.060, o15.061 in water to reach a final concentration of 100 uM for each.
  • Made aliquots of each primer at concentration 10 uM.

PCR: Made 2 tubes of PCR for each gBlocks, containing:
  • 1 uL of gBlock (1 ng)
  • 2 uL forward primer
  • 2 uL reverse primer
  • 50 uL Master Mix 2X
  • 45 uL water

Settings PCR:
  • 30s at 98°C
  • 35 times:
    • 10s at 98°C
    • 30s at 50°C
    • 1m at 72°C
  • 10m at 72°C
  • the tubes were then kept at 10°C

Results

After gel migration, we got this: [image]
The PCR worked.

We then made a PCR purification (should I describe full protocol?) and measured the final concentration of gBlocks with a Nanodrop:
  • Final concentration gBlock vA-2 tube a = 126.1 ng/uL
  • Final concentration gBlock vA-2 tube b = 96.6 ng/uL
  • Final concentration gBlock vA-3 tube a = 128.7 ng/uL
  • Final concentration gBlock vA-3 tube b = 75.8 ng/uL
  • Final concentration gBlock vA-4 tube a = 201.8 ng/uL
  • Final concentration gBlock vA-4 tube b = 108.3 ng/uL