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        Yeast RNA Miniprep

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        Yeast RNA Miniprep

         

         

        • grow cells to mid-log phase (10-20 ml) (or take samples from time courses, 5-25 ml)
        • spin cells, discard supernatant
        • wash cells once with 1 ml cold RNA buffer
        • freeze pellet in dry ice (and than @ -80 °C)
        • thaw cells on ice
        • add 100-120 µl ice cold RNA-buffer, resuspend by vortexing
        • add 1/2 vol. acid washed glass beads
        • vortex at highest level 3 min in cold room or use FastPrep machine (20 sec., level 4.5)
        • add 450 µl RNA-buffer-SDS (RT), vortex briefly
        • add 450 µl equilibrated Phenol
        • vortex at highest level 3 min in cold room
        • spin full speed 10 min in cold room
        • transfer upper phase to fresh tube (do not take any of the interface !)
        • add 300 µl equilibrated Phenol , vortex
        • add 300 µl Chloroform , vortex
        • spin 2 min , extract upper phase once again with Chloroform
        • add 20 µl 4 M NaCl , 1 ml Ethanol
        • precipitate 30 min at -20 to -80 °C
        • spin full speed 10 min
        • wash pellet with 150 µl 70 % Ethanol
        • air dry pellet
        • resuspend in 30-50 µl H2 O , store at -20 to -80 °C

         


        Buffers:
        (All buffer components and stock-solutions, except the Tris-stock-solution, are DEPC treated and autoclaved)

         RNA-buffer:
        50 mM Tris (HCl) pH 7.4; 100 mM NaCl; 10 mM EDTA
        [for 100 ml : 5 ml 1M Tris pH 7.4; 2.5 ml 4 M NaCl; 2 ml 0.5 M EDTA]

         RNA-buffer-SDS:
        RNA-buffer + 1.3 % SDS

         

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