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May 1 1990
C. Helms
Principle:
Special solutions required:
Time required:
Procedure:
Day 1
Day 2
NOTE: This procedure can be scaled up many fold. For cell culture volumes over 25 mls reprecipitate with isopropanol after step 9 since a great deal of KOAc is still held in large pellets (which lowers pH). Before banding the DNA in CsCl check that the DNA solution is of neutral pH.
Solutions:
GTE solution:
stock solution volume final concentration 40% sterile glucose 2.27 ml 50 mM 0.5 M EDTA, pH 8 2.0 ml 10 mM 1M Tris-HCl, pH 8 2.5 ml 25 mM sterile ddH2O 93.23 ml Total: 100.0 ml Use all sterile stock solutions. Store at 4 degrees C.
stock solution volume final concentration 1N NaOH 2.0 ml 0.2 N 10% SDS 1.0 ml 1% sterile ddH2O 7.0 ml Total: 10.0 ml Prepare fresh solution prior to use.
3 M Potassium Acetate:
stock solution volume 5 M KOAc 60 ml glacial acetic acid 11.5 ml ddH2O 28.5 ml 100 ml Filter sterilize. The resulting solution is 3 M potassium and 5 M acetate and has a pH of about 4.8.
RNAase (10 mg/ml):
Dissolve 100 mg RNAase A (pancreatic RNAase) in 10 ml 10mM Tris-HCl 15 mM NaCl. Heat to 100 degrees C (in a beaker of boiling water) for 15 minutes. Cool slowly to room temperature. Dispense into aliquots and store at -20 degrees C.
References:
Sambrook J. Fritsch E.F. and T. Maniatis (1989). Molecular Cloning A Laboratory Manual. Second edition. Cold Spring Harbor Laboratory Press pp.1.25-1.28.