Transfection of HEK 293 cells and immunoprecipitation of HA-tagged Abl protein was carried out as described previously [5] (link), [7] (link) using the monoclonal Anti-HA agarose conjugate (Clone HA-7, Sigma-Aldrich). Immunoblotting was done using the following antibodies: anti-phosphotyrosine (4G10, Millipore), anti-phospho-Abl (Tyr412, Cell Signaling Technology), and anti-HA labeled with AlexaFluor 680 (Molecular Probes). Secondary antibody was goat anti-mouse IgG labeled with AlexaFluor 680 (Molecular Probes). Alternatively, peroxidase-labeled mouse anti-HA antibody (HA-7, Sigma) was used. Quantification of the relative amounts of immunoprecipitated Abl protein was done using the Odyssey system (Li-Cor) or ImageJ program.
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