I chose to study the possible interaction of two proteins in HEK cells using the proximity ligation assay. Has anyone tried something similar and have a starting protocol?
I'm using Duolink PLA kit from Sigma. If you happen to use the same one, I think the protocol by Sigma is pretty easy to work out. Also there is a video showing PLA protocol.
We have used the PLA in Hek cells with great success. Just follow the protocol from Duolink. We used our antibodies at the same concentrations that work well for IF.
We have just published a very detailed protocol to use PLA in cells, mice and human tissue. In additon, we show how to count and improve the signal (deconvolution) and troubleshooting. You can find the protocol here http://onlinelibrary.wiley.com/doi/10.1002/cpph.15/full