Fig. 1: Structure of initiation of RING-anchored ubiquitin chain elongation.

a Side and top view of the Ub-R:Ube2N~Ub:Ube2V2 structure (Ub-R, Ub in red, R in blue, Ube2N~Ub, Ube2N in green, Ub in orange, and Ube2V2 in teal). Chains drawn as cartoon represent the asymmetric unit. b The canonical model of initiation of RING-anchored ubiquitin chain elongation. c Schematic cartoon, representing the canonical model of RING-anchored ubiquitin chain elongation shown in b. Symmetry mates are denoted by ′ next to the label. Ub ubiquitin, Ub-R ubiquitin-RING.