IGROV-1-Cas9-PAX8-BioID-T2A-mCherry Clone B3 and C5 cells were seeded at 4 × 105 cells/well in a 6-well plate. The following day, cells were treated with 50 μM biotin (Fluka) or dimethyl sulfoxide (Sigma) for 24 h. Cell pellets were harvested and lysed in RIPA buffer supplemented with protease inhibitor cocktail (Roche). Lysates (80 μg) were then incubated with streptavidin beads (Cell Signaling) overnight under rotation at 4 °C. Immunoprecipitates were washed five times with RIPA buffer containing protease inhibitors, eluted with NuPAGE Blue Sample buffer (Life Technologies) by incubation at 95 °C for 10 min, and resolved by standard SDS‐PAGE gel electrophoresis and Western blotting as described above.
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