Swartz:Protocols/Purification of His-tagged proteins: Difference between revisions
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For purification of Cell-free proteins see https://docs.google.com/document/d/1bSKL1hx6VjR3rMI4UtpCcMEDm7OYm8pnpkQHids4v5g/edit | For purification of Cell-free proteins see https://docs.google.com/document/d/1bSKL1hx6VjR3rMI4UtpCcMEDm7OYm8pnpkQHids4v5g/edit | ||
=General protocol for His-tag protein purification with 1mL columns= | |||
==Buffers== | |||
:Buffer A: 10mM Imidazole, 50mM NaPhosphate pH 8, 300mM NaCl | |||
:Buffer A.5: Same as B with 30mM Imidazole | |||
:Buffer B: Same as A with 50mM Imidazole | |||
:Buffer C: Same as A with 250mM Imidazole | |||
==Cell-free protein synthesis:== | |||
:Run cell-free reaction under standard protocols | |||
::-For purification, I usually use 1mL CFPS reaction in a 6-well culture plate | |||
:After completion, add Buffer C so that the sample has a 10mM Imidazole concentration as for Buffer A, the loading buffer | |||
==Purification:== | |||
:Wash column with 5mL water | |||
:Add 2mL 0.1M NiSO4 | |||
:Wash with 5mL water | |||
:Equilibrate with 5mL Buffer A | |||
:Load sample, collecting flowthrough | |||
:Wash with 10mL Buffer B, collecting in 5mL fractions | |||
::(Alternatively, washes can be done with 5mL Buffer A, 5mL A.5, and 5mL B to test binding or with 5mL Buffer A if protein is known to elute early) | |||
:Elute with 3mL Buffer C, collecting in 1mL fractions | |||
:Final wash with 2mL Buffer B | |||
:Wash column with 5mL water | |||
:Regenerate with 5mL 0.5M EDTA | |||
:Equilibrate with 5mL Buffer A (only because pH of my EDTA solution is very high) | |||
:Wash with 5mL water | |||
:Store in 3mL 20% EtOH | |||
:Run about 8uL on gel (or less for flowthrough fraction) to check for elutions to pool |
Revision as of 00:16, 15 May 2012
See Purification_of_His-tagged_proteins and https://docs.google.com/document/d/1OqY94AYARJD84spfuFVZ_YX1Ypa-i717sxUUJU2GJ9Y/edit
For purification of Cell-free proteins see https://docs.google.com/document/d/1bSKL1hx6VjR3rMI4UtpCcMEDm7OYm8pnpkQHids4v5g/edit
General protocol for His-tag protein purification with 1mL columns
Buffers
- Buffer A: 10mM Imidazole, 50mM NaPhosphate pH 8, 300mM NaCl
- Buffer A.5: Same as B with 30mM Imidazole
- Buffer B: Same as A with 50mM Imidazole
- Buffer C: Same as A with 250mM Imidazole
Cell-free protein synthesis:
- Run cell-free reaction under standard protocols
- -For purification, I usually use 1mL CFPS reaction in a 6-well culture plate
- After completion, add Buffer C so that the sample has a 10mM Imidazole concentration as for Buffer A, the loading buffer
Purification:
- Wash column with 5mL water
- Add 2mL 0.1M NiSO4
- Wash with 5mL water
- Equilibrate with 5mL Buffer A
- Load sample, collecting flowthrough
- Wash with 10mL Buffer B, collecting in 5mL fractions
::(Alternatively, washes can be done with 5mL Buffer A, 5mL A.5, and 5mL B to test binding or with 5mL Buffer A if protein is known to elute early)
- Elute with 3mL Buffer C, collecting in 1mL fractions
- Final wash with 2mL Buffer B
- Wash column with 5mL water
- Regenerate with 5mL 0.5M EDTA
- Equilibrate with 5mL Buffer A (only because pH of my EDTA solution is very high)
- Wash with 5mL water
- Store in 3mL 20% EtOH
- Run about 8uL on gel (or less for flowthrough fraction) to check for elutions to pool