Western blotting was performed using a sodium dodecyl sulfate-polyacrylamide gel electrophoresis system as described previously [12 (link)]. Immunoblotting was performed by incubation at 4 °C with antibodies against CUL4A (1:1000; CST) and β-actin (1:2000, Santa Cruz Biotechnology) overnight. Blots were then washed and incubated with a 1:2000 dilution of horseradish peroxidase (HRP)-conjugated secondary antibody (Jackson, West Grove, PA, USA), followed by three washes with Tris-buffered saline-containing Tween 20. Pierce Enhanced chemiluminescent HRP substrate (Thermo Fisher) was used for detection according to the manufacturer’s instructions.
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