Secondary ubiquitin-RING docking enhances Arkadia and Ark2C E3 ligase activity.
Wright, J.D., Mace, P.D., Day, C.L.(2016) Nat Struct Mol Biol 23: 45-52
- PubMed: 26656854 
- DOI: 10.1038/nsmb.3142
- Primary Citation of Related Structures:  
5D0I, 5D0K, 5D0M - PubMed Abstract: 
RING-domain E3 ligases enhance transfer of ubiquitin to substrate proteins by stabilizing the RING-bound thioester-linked E2∼ubiquitin conjugate in a defined conformation that primes the active site for nucleophilic attack. Here we report that the monomeric RING domains from the human E3 ligases Arkadia and Ark2C bind directly to free ubiquitin with an affinity comparable to that of other dedicated ubiquitin-binding domains ...