One-Step Yeast Transformation
60% PEG |
667 |
333 |
67 |
4M LiAc |
50 |
25 |
5 |
1M DTT |
100 |
50 |
10 |
Water |
183 |
92 |
18 |
Total |
1000 |
500 |
100 |
PEG: Polyethylene glycol 4000 (Autoclave)
LiAc: Lithium acetate (Autoclave)
DTT: Dithiothreitol (Filtration, Store at –20ºC)
Freshly prepare more than 100 µl One-Step buffer for 1 transformation
Carrier RNA or heat-denatured carrier DNA (10 mg/ml)
Yeast culture
1) Liquid YPD culture: 2 ml YPD for one transformation, 24 hr
2) YPD plate culture: Spread cell suspension on a plate and grow for 24 hr
We prefer plate culture.
Method
Transfer yeast liquid culture to a microtube
Centrifuge at 12000 rpm for 5 sec
Discard supernatant
Add 50 µl One-step buffer to the cell pellet. Go to Step 2
Step 1. Take 50 µl One-step buffer in a
microtube
Transfer cells grown on a plate to the tube with a toothpick or a spatula
(approx. 10-20 µl volume per 50 µl. Much is better)
Step 2. Voltex or mix by pipetting. Centrifuge 12000 rpm for 5 sec.
Step 3. Take out the supernatant by pipetman
Step 4. Add 50 µl One-step buffer, 5µl carrier RNA and 1-5 µl DNA
Step 5. Mix by pipetting or voltex
Step 6: Incubate at 42ºC for 1-3 hr depending on yeast strains and its growth phase (Usually 1 hr)
Step 7: Add 150 µl sterile water and spread on a selection plate
Incubate for 2-3 days
これらの論文や,他の論文,さらに,私たちいじった様々なパラメター(ネガティブな結果が大量にあります)から現在もっとも効率よい最も簡単な方法が現在の私たちの方法です。まだ改良できると思っています。