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        RNA Isolation from Yeast

        互联网

        1813

        RNA Isolation - Volumes and weights are for 10 ml cultures (1-2 x 107 cells/ml).

        1.Spin down cells, decant, and resuspend in 0.2 ml extraction buffer with SDS and transfer to a 1.5 ml eppendorf tube. The cells can be frozen at 70℃ at this point for up to several weeks.

        2.Add 0.2 ml PCIA and ~0.4g of acid washed beads (soaked in nitric acid, washed extensively with deionized water until neutralized, and then baked in a 200℃ oven until dry).

        3.Vortex in the Tomy shaker for 2.5 minutes.

        4.Add 0.3 ml PCIA and 0.3 ml extraction buffer containing SDS, vortex 1 minute, and spin 15K, 5 minutes.

        5.Remove aqueous phase to a new tube, and repeat extraction with an equal volume of PCIA.

        6.Spin 15K, 5 minutes, and remove the aqueous phase to a new tube. Repeat extraction if the interphase is cloudy.

        7.Add 2 volumes of 95% ethanol containing 0.05% diethylpyrocarbonate. Place at 70 for 1 hr. Spin at 4℃ for 20 minutes, 15K.

        8.Wash pellet twice with 0.5 ml cold 75% ethanol containing diethylpyrocarbonate. Dry in Speed Vac.

        9.Resuspend in 100 ul DEPC-treated water.

        Solutions

        Extraction Buffer

        0.5 M sodium chloride

        0.2 M Tris pH 7.6

        0.01 M EDTA

        1% SDS

        0.1% Diethylpyrocarbonate (DEPC)

        Note: add sodium chloride, EDTA and SDS and q.v. to 80 ml, autoclave to kill DEPC, then add Tris (made with DEPC-treated water)

        Extraction Buffer minus SDS

        0.5 M sodium chloride

        0.2 M Tris pH 7.6

        0.01 M EDTA

        0.1% DEPC

        Note: add sodium chloride and EDTA, q.v. to 80 ml, autoclave to kill DEPC, then add Tris (made with DEPC-treated water)

        PCIA

        25 ml phenol

        24 ml chloroform

        1 ml isoamyl alcohol

        50 ml extraction buffer minus SDS

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