cDNAs for 12 components of the hippo signaling pathway were cloned into into pMK33-CTAP(SG) and stable S2R+ cell lines were generated. Cells were induced overnight with 140uM copper. Experiments were done in triplicate.

Cells were lysed and soluble lysate was incubated with IgG sepharose in the first affinity purification step. Beads were collected, washed and bound proteins eluted by TEV protease cleavage. In a second purification step, TEV-eluted proteins were incubated with Streptavidin Plus resin. Purified proteins were then eluted with 2mM biotin.

Purified proteins were TCA precipitated, trypsin digested in solution, dried and resuspended. Peptides were analysed by LC-MS/MS. MS/MS spectra were matched to peptides using SEQUEST and a composite database of all translated D. melanogaster open reading frames in FlyBase (r5.23).