6His co-eluted protein ?

Artem Evdokimov AEVDOKIMOZ at cinci.rr.com
Thu Nov 8 21:23:44 EST 2001

Aye, that earlier post was prolly mine :) As DK has pointed out, that was
indeed His-rich c/t proline isomerase. Very common co-elution impurity.

You can have a whole host of proteins co-eluting, especially if your protein
tends to bind other stuff. I have seen persistent 48 kDa and 96 kDa bands,
and we have once figured out  some of the possibilities but it was a while
ago and I forgot :).


"Emir Khatipov" <khatipovNO at NOuchicago.edu> wrote in message
news:%gAG7.91$P4.5329 at news.uchicago.edu...
> Hi All,
> Someone recently posted here that the E.coli protein that many co-purify
> a Ni or Co columns is actually a proline ...-ase. I failed to find this
> message in archives, and I would appreciate someone re-posting which
> that was and what is its MW. My colleague has doublets coeluted from
> Co-column (only one of them gives a specific band on Western - ~48kDa) and
> wonder if she copurifying that proline enzyme.
> Thank you.
> Emir

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