IP data confusionIP Western Blot bands
Posted 01 March 2013 - 01:41 PM
I am trying to see the interaction of Protein A (Myc tag) & Protein B (Flag tag)
I transfected in 293 cells, blotted to see whole cell protein expression and came out with the expected bands.
Next step was to IP.
I pre-cleared with Protein A/G beads for 1 hour, and then transferred the supernatant into new tubes and put Myc conjugated beads overnight.
Next day I washed with NP-40 three times and then prepped the beads with sample buffer and then boiled.
Ran a western and blotted with Flag. (IP with myc and blot with flag)
My samples were
empty vector (negative control), protein A, Protein B, and Protein A&B.
Whole cell expression was the same as before but in my IP sample lanes I see a band in lanes with Protein B (flag tag), and Protein A&B.
I know I should only see a band in the Protein A&B lane for my IP samples.
If someone could comment on this I would really appreciate it!
Posted 01 March 2013 - 01:48 PM
Posted 01 March 2013 - 02:10 PM
Posted 01 March 2013 - 06:29 PM