Figure 2.

Polyubiquitinated p53 species detected in U2OS cells titrated with LMP1. Western blot detection of transfected LMP1, endogenous p53 protein levels and detection of ubiquitinated p53 species in U2OS cells transiently transfected with titrated LMP1 (0.05 - 4.0 μg). For the ubiquitination experiment, p53 protein was immunoprecipitated from the cell lysate with anti-p53 mouse monoclonal antibody (DO-1) and then immunoblotted with anti-ubiquitin rabbit polyclonal antibody. β-actin was served as a loading control in the experiment. Representative blots were quantitated using Image J. Increased polyubiquitinated p53 protein was seen as high molecular weight aggregates in LMP1 expressing cells.