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T132 phosphorylation status determines PRMT4 ubiquitination. A and B: WT and T132A mutant PRMT4 were coexpressed with GSK-3β for 48 h. V5 immunoprecipitates were analyzed with ubiquitin immunoblotting. C and D: WT, T132C, and T132D mutant PRMT4 were introduced into MLE12 cells for 48 h, respectively. V5 immunoprecipitates were analyzed with ubiquitin and V5 immunoblotting. Results are representative of 3 independent experiments. *P < 0.05 or **P ≤ 0.01 vs. corresponding control.
