Figure 4. High throughput screen for the effect of ubiquitin mutations on polyubiquitin chain formation.
The effect of ubiquitin mutations on polyubiquitin chain formation by Ubc13-Mms2. Wells in row 1 contain E1, Ubc13-Mms2 and ubiquitin, row 2 contains E1 and ubiquitin, and row 3 contains ubiquitin alone. Protein concentrations used were 2 μM Ubc13-Mms2, 0.5 μM E1, 500 μM ubiquitin (except for no-lysine ubiquitin which was at 100 μM). Reactions were incubated for 1 hour at 37 °C, quenched and the absorbance measured. Assay was performed in duplicate, with representative data shown.