Cited by 126Ubiquitin and proteasome pathwaysNF-κB Signaling PathwaysGenomics and Chromatin Dynamics

Priming and Extending: A UbcH5/Cdc34 E2 Handoff Mechanism for Polyubiquitination on a SCF Substrate

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Wu, Kenneth, Kovacev, Jordan, Pan, Zhen-Qiang·2010·Molecular Cell

Abstract

We describe a mechanistic model of polyubiquitination by the SCF(beta TrCP2) E3 ubiquitin (Ub) ligase using human I kappaB alpha as a substrate. Biochemical reconstitution experiments revealed that the polyubiquitination of I kappaB alpha began with the action of the UbcH5 E2 Ub-conjugating enzyme, transferring a single Ub to I kappaB alpha K21/K22 rapidly and efficiently. Subsequently, the Cdc34 E2 functioned in the formation of polyubiquitin chains. It was determined that a Ub fused at I kappaB alpha K21 acts as a receptor, directing Cdc34 for rapid and efficient K48-linked Ub chain synthesis that depends on SCF(beta TrCP2) and the substrate's N terminus. The I kappaB alpha-linked fusion Ub appears to mediate direct contacts with Cdc34 and the SCF's RING subcomplex. Taken together, these results suggest a role for the multifaceted interactions between the I kappaB alpha K21/K22-linked receptor Ub, the SCF's RING complex, and Cdc34 approximately S approximately Ub in establishing the optimal orientation of the receptor Ub to drive conjugation.

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Crossref · 10.1016/j.molcel.2010.02.025

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Authors
Wu, K., Kovacev, J., & Pan, Z.-Q.
Affiliations
Icahn School of Medicine at Mount Sinai (US)
Corresponding author
Pan, Zhen-Qiang
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2010-03
Volume
37
Issue
6
Pages
784-796
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2010517835
Cited by
126
References
30
Citations by year
2026: 2 · 2025: 8 · 2024: 15 · 2023: 5 · 2022: 6 · 2021: 11 · 2020: 9 · 2019: 8 · 2018: 4 · 2017: 3 · 2016: 9 · 2015: 7 · 2014: 10 · 2013: 6 · 2012: 7
FWCI
3.78
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Cancer Institute (CA 095634, R01CA095634)
  • National Institute of General Medical Sciences (GM61051, R01GM061051)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Chromatin Dynamics
Keywords
polyubiquitination, Cdc34, E2 ubiquitin-conjugating enzyme, E3 ubiquitin ligase, IκBα, ring complexes, ubiquitin receptors, NF-κB signaling
MeSH terms
Humans, Substrate Specificity, RNA, Small Interfering, Ubiquitin-Protein Ligase Complexes, Ubiquitin-Conjugating Enzymes, SKP Cullin F-Box Protein Ligases, Cell Line, Tumor, I-kappa B Kinase, Ubiquitination, Biocatalysis, Anaphase-Promoting Complex-Cyclosome

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