This is also a problem with MBP protein tags as well. I had luck using a
ion exchange columns and eluting using salt.
> Getting rid of trace GST after cleavage is not trivial IMO. After
> expressing a GST fusion protein we cleaved away the GST using a thrombin
> cleavage site and ran an affinity column to get rid of uncleaved fusion
> protein and free GST. The resulting flowthrough has a single band on
> Coomassie blue stained gel but still has GST present as measured by ELISA.
> We've switched to plan B - a different construct.
>> Allison
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