Cited by 347Ubiquitin and proteasome pathwaysEnzyme Structure and FunctionProtein Degradation and Inhibitors

Structure of an E3:E2∼Ub Complex Reveals an Allosteric Mechanism Shared among RING/U-box Ligases

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Pruneda, Jonathan N., Littlefield, Peter J., Soss, Sarah E., Nordquist, Kyle A., Chazin, Walter J., Brzovic, Peter S., Klevit, Rachel E.·2012·Molecular Cell

Abstract

Despite the widespread importance of RING/U-box E3 ubiquitin ligases in ubiquitin (Ub) signaling, the mechanism by which this class of enzymes facilitates Ub transfer remains enigmatic. Here, we present a structural model for a RING/U-box E3:E2~Ub complex poised for Ub transfer. The model and additional analyses reveal that E3 binding biases dynamic E2~Ub ensembles toward closed conformations with enhanced reactivity for substrate lysines. We identify a key hydrogen bond between a highly conserved E3 side chain and an E2 backbone carbonyl, observed in all structures of active RING/U-Box E3/E2 pairs, as the linchpin for allosteric activation of E2~Ub. The conformational biasing mechanism is generalizable across diverse E2s and RING/U-box E3s, but is not shared by HECT-type E3s. The results provide a structural model for a RING/U-box E3:E2~Ub ligase complex and identify the long sought-after source of allostery for RING/U-Box activation of E2~Ub conjugates.

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Crossref · 10.1016/j.molcel.2012.07.001

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  • Compared to prior isolated RING-UBE2D~UB structures, the neddylated CRL1β-TRCP-UBE2D~UB-substrate intermediate shows additional density corresponding to the substrate proxy along a trajectory to the ubiquitylation active site.

    “Compared to prior isolated RING-UBE2D~UB structures28–30, the neddylated CRL1β-TRCP-UBE2D~UB-substrate intermediate shows additional density corresponding to the substrate proxy along a trajectory to the ubiquitylation active site”

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Authors
Pruneda, J. N., Littlefield, P. J., Soss, S. E., Nordquist, K. A., Chazin, W. J., Brzovic, P. S., & Klevit, R. E.
Affiliations
  • University of Washington (US)
  • Vanderbilt University (US)
Corresponding author
Klevit, Rachel E.
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2012-09
Volume
47
Issue
6
Pages
933-942
ISSN
1097-2765 (ISSN-L)
OpenAlex
W1982004004
Cited by
333
References
36
Citations by year
2026: 24 · 2025: 23 · 2024: 23 · 2023: 18 · 2022: 17 · 2021: 18 · 2020: 28 · 2019: 22 · 2018: 18 · 2017: 23 · 2016: 29 · 2015: 25 · 2014: 33 · 2013: 29 · 2012: 3
FWCI
11.50
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • U.S. Department of Energy
  • Vanderbilt University
  • National Institutes of Health
  • U.S. Public Health Service
  • National Cancer Institute (P50 CA068485, T32CA009582, P30CA068485)
  • National Institute of General Medical Sciences (R01GM088055, R01GM075156, T32GM007270, R01GM098503)
  • National Institute of Environmental Health Sciences (P30ES000267, P30 ES0000267)
  • National Center for Research Resources (S10RR019133)
  • Biological and Environmental Research
  • Pacific Northwest National Laboratory
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
Keywords
allosteric activation, hydrogen bonding, HECT E3 ligases
MeSH terms
Hydrogen Bonding, Protein Binding, Protein Conformation, Signal Transduction, Crystallography, X-Ray, Protein Subunits, Ubiquitin, Ubiquitin-Conjugating Enzymes, Ubiquitin-Protein Ligases

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