28 April 2015 6 7K Report

Hi guys,

I am encountering a problem that my protein can't be purified by affinity purification, namely GST resin. This protein is a mutated protein where 20 amino acids were deleted. My protocol is: after bacteria BL21 DE3 growing at 37 (200mL culture in 500 mL flask)until OD600 reaches 0.8, and then add 1mM IPTG and switch to 30 degree overnight. The wild-type protein was expressed and purified pretty well, but the mutated protein can't be purified. Did my protein go into inclusion bodies? because I found that after sonication, the solution of wild-type and mutated proteins were still not clear, but GST empty vector was very clear. If my mutated protein went into inclusion bodies, so what's wrong with my wide-type protein?

can somebody help me? Thanks a lot!

Cheers

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