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        EXO/S1 DELETION SERIES

        互联网

        1426
          1. Cut DNA with 5'- and 3'- overhangs, gel check, phenol-Sevag extract and NaOAc/EtOH ppt.

        2. Prepare one S1 nuclease tube (on ice) for each time point: 15ml S1 Buffer + 0.25U S1/ml (5U).

        3. Use 5ml (=0.5mg) digested plasmid (in EB) per time point. Add 4U Exonuclease III/ml reaction mix and incubate @ 37℃ (‰400 digested/min).

        4. Remove 5ml aliquots into the S1 nuclease tubes (on ice) at various times. When all time points have been collected, incubate the tubes 30' @ RT.

        5. Add 2ml STOP Buffer/tube and incubate 10' @ 70oC.

        6. Add: 2.0ml 10X Klenow Mix

        +2.0ml 0.125mM dNTPs

        +0.5ml Klenow

        Incubate 10' @ 37℃.

        7. Analyze 10ml on a gel. To the remainder in each tube, add 40ml Ligation Mix + 1ml T4 DNA Ligase. Incubate overnight @ 15℃ (or 2-3h @ RT).

        8. Transform 100ml competent cells with 10ml ligation reaction; freeze remainder.


        EB
        66mM Tris-HCl, pH 8
        0.66mM MgCl2

        10X Klenow Mix
        20mM Tris-HCl, pH 8
        100mM MgCl2

        S1B
        40mM KOAc
        300mM NaCl
        1.3mM ZnS04
        7% Glycerol


        Ligation Mix
        50mM Tris-HCl, pH7.6
        1mM MgCl2
        1mM ATP
        1mM DTT
        5% PEG 6000

        S1 STOP 300mM Trizma base
        50mM EDTA

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