G HEK293T cells transfected with His-tagged ubiquitin and HA-tagged NEMO WT or NEMO lacking the CC1 domain together with Strep-tagged empty vector or MARCH2 were treated with MG132 (10 μM) for 6 h before harvest. Lysates were subjected to immunoprecipitation with an anti-HA antibody, followed by immunoblotting with an anti-His antibody. WCL were subjected to immunoblotting with anti-HA, anti-Strep, or anti-β-actin antibody. 