Figure 5.
Analysis of ligase activity and complex formation with UBZ mutants of RAD18. (A) Purified complexes (3.7 pmol) were analyzed by SDS–PAGE followed by staining with CBB. I, RAD6A–(HisRAD18–FLAGRAD18); II, RAD6A–(HisRAD18C207F–FLAGRAD18C207F); III, RAD6A–(HisRAD18D221A–FLAGRAD18D221A). Structures are represented schematically, UBZ domains with a mutation being shown in white boxes. (B) Ligase activity of the respective RAD6A–RAD18 complexes. Increasing amounts of the complexes (0.5, 1 and 2 pmol) shown in (A) were subjected to standard assays.