vOTU preferences for different di-Ub linkages.

(A) Activity towards K48, K63, and K11 linked di-Ub FRET-TAMRA substrates. Values shown are the mean ± standard deviation of two independent experiments. (B) Gel cleavage assay of unlabeled di-Ub, visualized by Commassie Blue staining. (C) Summary of currently investigated vOTU di-Ub activity (present study and [32]).