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        纯化资料

        丁香园论坛

        2005
        Purification proteins by TALON

        50 ml Cells weight (mg) Bugbuster (ml) 1´Extraction buffer (ml) TALON (ml) Resin (ml) Elution buffer (ml)
        300 2.0 2.0 1000 500 250

        2.0 ml eppendorf tubes should be used for mini-purification. For this purpose, if the total volume is more than 2 ml, try to use 5´Extraction buffer instead of 1´Extraction buffer.

        5´Extraction buffer: 1.0 ml supernatant + 250 ml 5´Extraction buffer
        1.5 ml supernatant + 375 ml 5´Extraction buffer

        check buffer pH just before using
        this protocol may need to be optimize for diffirent proteins

        Day 1.

        Sample preparition:
        1. Weight
        2. add Bugbuster (Benzonase to be added)
        3. resuspend it by inverting
        4. incubate 20 min at RT.
        5. centrifuge 20 min at 4°C, 13000rpm
        6. supernatant (soluble proteins)
        take 40 ml out for SDS-PAGE checking (as "before purification")
        to the left, add 1´ or 5´ native extraction/wash buffer pH 7.0, this is clarified sample, ready for combining with TALON.
        7. Pellet (insoluble proteins)
        Add 1´ denaturing extraction/wash buffer pH 7.0
        resuspend it
        agitate 20 min at RT (or until it become translucent),
        centrifuge 15 min at 4°C, 13000 rpm,
        transfer the supernatant to a new tube (this is clarified sample)
        take 40 ul out for SDS-PAGE checking (as "before purification").

        Column preparition(pre-equilibrate):
        1. take appropriate amount volume of TALON
        2. centrifuge 2 min at 700 rcf (g), throw away supernatant
        3. add 1 ml 1´ extraction buffer (native or denaturing)
        4. centrifuge 2 min at 700 rcf, throw away supernatant
        5. repeat once.

        Binding:
        1. add clarified sample to the resin
        2. agitate 20 min at RT
        3. centrifuge 5 min at 700 rcf
        4. take supernatant out, keep it (as "no bands" fraction)

        Washing (2´):
        1. add 1.5 ml 1´ extraction buffer
        2. agitate 10 min at RT
        3. centrifuge 5 min at 700 rcf, take supernatant out, keep it (as "wash 1")
        4. repeat once ("wash 2")

        Elute (pre-elute+elute):
        1. add 1.5 ml 1´ extraction/wash buffer to the resin
        2. transfer it to the pre-equilibrated column
        3. allow the resin settle down
        4. remove the end-cap, allow the buffer to drain
        5. pre-elute the column with pre-elute buffer for 5 times, keep each fraction
        6. elute with elution buffer for 8 times, keep each fraction

        SDS-PAGE:
        1. 7 ml of proteins +7 ml sample buffer
        2. load 10 ml on gel
        3. 10 ul prestained protein marker

        Dialysis:
        1. transfer fractions containing proteins into membrane , tie each end, dialysis in 2 L PBS at 4°C o/n.

        Day 2.

        1. Fresh PBS, dialysis another 2 h (at least)
        2. aliquote proteins, 20°C store it (at least 100 mg required for phage selection).

        SDS-PAGE:
        1. 7 ul of proteins +7 ul sample buffer, load 10 ul on gel
        2. load 10 ul of 10, 50, 100, 500 ug/ml BSA (7:7 BSA: sample buffer) on gel for checking protein concentration
        3. 10 ul prestained protein marker
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