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Can Immunoprecipitation result in the identification of a modified form of a pro

Protein Expression

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#1 Phina Bassey

Phina Bassey


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Posted 14 March 2014 - 06:16 PM

Hi All,


Please does anyone know if immunoprecipation followed by Western blotting can result in the identification of a modified form of a protein that is not otherwise detected via western blotting alone? See attached document. I keep seeing a band at ~130 kDa compared to the ~100 kDa size of my protein when I perform IP/WB compared to when I perform WB alone. I am torn between whether this is a PTM or just unspecificity of my antibody. Also, I am wondering if this is resulting from the PA beads I used?? Any ideas and suggestions are welcome. Thanks.


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  • IP;WB.png

#2 bob1


    Thelymitra pulchella

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Posted 14 March 2014 - 10:26 PM

What were your controls for the IP?  Did you do a normal serum IP as well as specific antibody?  Did you do a beads only or preclear IP?

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