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GST-tagged protein binds to column but is not eluted


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#1 research_freak

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Posted 09 April 2010 - 06:07 AM

Hey Guys,

I noticed that most of my GST-tagged protein comes into the soluble fraction during large-scale expression. When I tried to purify it on glutathione beads, most of my protein remains bound to the beads but fails to elute. Is there a way I can elute all of my protein?

Any advice is greatly appreciated.

#2 RMcKenney

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Posted 14 April 2010 - 04:21 AM

Hey Guys,

I noticed that most of my GST-tagged protein comes into the soluble fraction during large-scale expression. When I tried to purify it on glutathione beads, most of my protein remains bound to the beads but fails to elute. Is there a way I can elute all of my protein?

Any advice is greatly appreciated.



I've had this problem with a stubborn protein. I believe the protein gets aggregated on the column. Interestingly, I inserted an enzyme cleavage site (Prescission enzyme) in between the GST and my protein of interest. When I cut the GST off my protein, the protein is easily eluted off the column! Remember that GST is a dimer and may be forcing your protein of interest into conformations that may make it "unhappy."

Edited by RMcKenney, 14 April 2010 - 04:21 AM.





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