Figure 1. K11-linkages are found in chains of distinct topologies.
A. In homogenous K11-linked chains, all ubiquitin molecules are connected through K11-linkages. B. In mixed chains, K11- and other linkages are found, yet only one amino-group is modified per ubiquitin molecule. C. In branched ubiquitin chains, a single ubiquitin is connected to at least two other ubiquitin molecules.