Figure 4.
The effect of ubistatin or phosphorylation of Ub at S65 on E1 and E2-25K catalyzed Ub chain formation. SDS-PAGE gels of in vitro E1 and E2-25K-catalyzed polymerization reactions for UbWT (A and left panel in C) or equimolar mixture of UbWT with ubistatin A (B) or p-S65-Ub (right panel in C).