Structural basis for the RING-catalyzed synthesis of K63-linked ubiquitin chains

Emma Branigan, Anna Plechanovová, Ellis Jaffray, Jim Naismith, Ronald Thomas Hay

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Abstract

The RING E3 ligase catalysed formation of lysine 63 linked ubiquitin chains by the Ube2V2–Ubc13 E2 complex is required for many important biological processes. Here we report the structure of the RING domain dimer of rat RNF4 in complex with a human Ubc13~Ub conjugate and Ube2V2. The structure has captured Ube2V2 bound to the acceptor (priming) ubiquitin with Lys63 in a position that could lead to attack on the linkage between the donor (second) ubiquitin and Ubc13 that is held in the active “folded back” conformation by the RING domain of RNF4. The interfaces identified in the structure were verified by in vitro ubiquitination assays of site directed mutants. This represents the first view of the synthesis of Lys63 linked ubiquitin chains in which both substrate ubiquitin and ubiquitin-loaded E2 are juxtaposed to allow E3 ligase mediated catalysis.
Original languageEnglish
Pages (from-to)597-602
JournalNature Structural and Molecular Biology
Volume22
Issue number8
Early online date6 Jul 2015
DOIs
Publication statusPublished - Aug 2015

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