His TAG protein purification

Tyson Graber tysong at home.com
Fri Oct 8 21:51:10 EST 1999

....had the same problem purifying a 32 kDa protein (a dimer in vivo)....i
tried FPLC and gel filtration but i still got stubborn bands above
100kDa....came to the conclusion that the protein was probably aggregating.
not much you can do other than play around w/ reducing agents and such

Raimo J Pollanen <rpollane at UTMMG.MED.UTH.TMC.EDU> wrote in message
news:37F8FDF3.6950F7D0 at utmmg.med.uth.tmc.edu...
| I have started a project to purify a protein (recombinant ) His Tag from
| E coli and after Nickel (Novagen) column I have still big proteins
| (double band around 100-150kD) which follows even after  ion exchange
| and gel filtration steps...? How could I get eid of that ? My own
| protein is sized aroun 21-22kD??
|  Raimo

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