The transfected cells were treated with 20 μM MG132 (Sigma Aldrich) for 6 h, which was followed by cell lysis for immunoprecipitation. The cell lysates were incubated overnight with Protein-A/G MagBeads (Yeasen, Shanghai, China) and anti-ELAVL1 antibody (Cell Signaling Technology) or normal rabbit IgG (Cell Signaling Technology) at 4 °C. The protein complexes were retrieved, washed, and subjected to western blotting with an anti-ubiquitin antibody (Cell Signaling Technology) [23 (link)].
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