Pellet 1.5 ml of an overnight culture at 12,000 rpm in Eppendorf centrifuge at RT for 3 min. Resuspend bacterial pellet in 350 µl of STET buffer. Add 25 µl of freshly prepared solution of lysozyme (10 mg/ml in 10 mM Tris-Cl, pH 8). Mix by vortexing for 3 sec. Place the tube in a boiling water bath for exactly 40 sec. Centrifuge the lysate at 12,000 g for 10 min at room temp. Remove the glob of bacterial debris with a sterile toothpick. Add to the supernatant 40 µl of 2.5 M NaOAc (pH 5.2) and 420 µl of isopropanol. Mix by vortexing and store the tube for 5 min at room temp. Centrifuge at 12,000 g for 5 min at 4℃. Remove the supernatant and wash with 1 ml 70% ethanol. Dry the pellet and resuspend in TE (pH 8) with RNase A (20 µg/ml). STET buffer: 0.1 M NaCl 10 mM Tris-Cl, pH 8.0 1 mM EDTA, pH 8.0 5% Triton X-100 |
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