NEDD8 nucleates a multivalent cullin-RING-UBE2D ubiquitin ligation assembly
- PMID: 32051583
- PMCID: PMC7050210
- DOI: 10.1038/s41586-020-2000-y
NEDD8 nucleates a multivalent cullin-RING-UBE2D ubiquitin ligation assembly
Abstract
Eukaryotic cell biology depends on cullin-RING E3 ligase (CRL)-catalysed protein ubiquitylation1, which is tightly controlled by the modification of cullin with the ubiquitin-like protein NEDD82-6. However, how CRLs catalyse ubiquitylation, and the basis of NEDD8 activation, remain unknown. Here we report the cryo-electron microscopy structure of a chemically trapped complex that represents the ubiquitylation intermediate, in which the neddylated CRL1β-TRCP promotes the transfer of ubiquitin from the E2 ubiquitin-conjugating enzyme UBE2D to its recruited substrate, phosphorylated IκBα. NEDD8 acts as a nexus that binds disparate cullin elements and the RING-activated ubiquitin-linked UBE2D. Local structural remodelling of NEDD8 and large-scale movements of CRL domains converge to juxtapose the substrate and the ubiquitylation active site. These findings explain how a distinctive ubiquitin-like protein alters the functions of its targets, and show how numerous NEDD8-dependent interprotein interactions and conformational changes synergistically configure a catalytic CRL architecture that is both robust, to enable rapid ubiquitylation of the substrate, and fragile, to enable the subsequent functions of cullin-RING proteins.
Conflict of interest statement
Competing Interests Declaration
The authors declare no competing interests.
Figures
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Comment in
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Transfer of ubiquitin protein caught in the act.Nature. 2020 Feb;578(7795):372-373. doi: 10.1038/d41586-020-00325-9. Nature. 2020. PMID: 32066917 No abstract available.
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