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Control protein for eukaryotic expression - (Oct/04/2013 )

Hi Guys,

 

I am new to the forum, and so do I in recombinant protein expression in eukaryotic cells :-)

I am trying to set-up a recombinant protein expression in my lab, with HEK293 cells and CHO cells (expression vector: pcDNA3). For the moment I will try transient expression.

I was wondering if someone could advice to me a good positive control (I mean a protein) to validate my culture and transfection procedure. I mean, can someone tell which protein will be expressed for sure with pcDNA3/HEK293 or pcDNA3/CHO ?

Thanks a lot for your help.

 

PS: sorry for my poor english.

 

-Rafmac-

If you wish to check the transfection efficiency you can use GFP driven by the same promoter as pCDNA3.

-GNANA-

Hi GNANA,

 

Thanks for your reply. The aim is not (only) to check tranfection efficiency, but also to check protein production/purification yield (after one-step IMAC).

Is the GFP expressed at good level ?

-Rafmac-

Hi,

 i think you want to choose a protein to opyimize the purification system. so why not to choose an easily-done protein, such as GST. 

 best wishes.

-IBMSterry-

Hi IBMSterry,

 

Thanks for your reply. Using a protein easy to purify is a good idea. Do you think that GST from pGEX vectors (S.japonicum) would be a good choice ?

Having that said, has anyone ever expressed a human recombinant in HEK293 with good expression rate ? To be honest, I would prefer this kind of control for my expression system.

-Rafmac-

HEK's are marvelous for expression studies. Whenever I have a problematic expression vector, I stick it into HEK's and see marvelous expression. HEK cells are a good choice.

-jerryshelly1-