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Help! My HisTag Protein won't come off Ni Resin

Sergio sergioal at solea.quim.ucm.es
Tue Jan 25 08:30:37 EST 2000

read the Qiagen sugestions on:
there are some protocols on line

hope this help

Pamela Beckmann wrote:

> In a DENATURING (6M) urea prep of the extracellular domain of a His tagged
> protein (lots of Cys) expressed in E Coli, much of the protein stubbornly
> refuses to elute off the nickel resin.
> We have tried the obvious, like low pH (3), EDTA up to 100mM,  6M guanidine
> HCl,
> Triton up to 100%, and even Acetonitrile - in case the reaction was a
> hydrophobic one. In all cases there was always some bound protein left on
> the resin after treatment (as ascertained by running a small sample of the
> resin on an SDS gel and Coomassie staining).
> Has anyone had a similar problem? Any ideas will be welcome!
>                                                     Pamela Beckmann, NIMR
> ---

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