Cited by 187Ubiquitin and proteasome pathwaysProtein Degradation and InhibitorsEnzyme Structure and Function

Ubiquitin ligation to F-box protein targets by SCF–RBR E3–E3 super-assembly

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Horn-Ghetko, Daniel, Krist, David T., Prabu, J. Rajan, Baek, Kheewoong, Mulder, Monique P. C., Klügel, Maren, Scott, Daniel C., Ovaa, Huib +2 more·2021·Nature

Abstract

E3 ligases are typically classified by hallmark domains such as RING and RBR, which are thought to specify unique catalytic mechanisms of ubiquitin transfer to recruited substrates 1,2. However, rather than functioning individually, many neddylated cullin–RING E3 ligases (CRLs) and RBR-type E3 ligases in the ARIH family—which together account for nearly half of all ubiquitin ligases in humans—form E3–E3 super-assemblies 3–7. Here, by studying CRLs in the SKP1–CUL1–F-box (SCF) family, we show how neddylated SCF ligases and ARIH1 (an RBR-type E3 ligase) co-evolved to ubiquitylate diverse substrates presented on various F-box proteins. We developed activity-based chemical probes that enabled cryo-electron microscopy visualization of steps in E3–E3 ubiquitylation, initiating with ubiquitin linked to the E2 enzyme UBE2L3, then transferred to the catalytic cysteine of ARIH1, and culminating in ubiquitin linkage to a substrate bound to the SCF E3 ligase. The E3–E3 mechanism places the ubiquitin-linked active site of ARIH1 adjacent to substrates bound to F-box proteins (for example, substrates with folded structures or limited length) that are incompatible with previously described conventional RING E3-only mechanisms. The versatile E3–E3 super-assembly may therefore underlie widespread ubiquitylation.

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  • RING and RBR ligases have recently been shown to work in unison to mediate substrate ubiquitylation in a site-specific manner.

    “RING and RBR ligases have recently been shown to work in unison to mediate substrate ubiquitylation in a site-specific manner116,117.”

    From PROTAC targeted protein degraders: the past is prologue (2022) · cites this paper as [117]

  • The exact mechanism of ubiquitylation for MRLs is not as well understood as the mechanism for CRLs, for which substrate recruitment by multiple adaptors and the molecular details of Ub transfer from E2-Ub to the target have been extensively characterized at the atomic level of an entire CRL1 complex.

    “The exact mechanism of ubiquitylation for MRLs is not as well understood as the mechanism for CRLs, for which substrate recruitment by multiple adaptors and the molecular details of Ub transfer from E2–Ub to the target has been extensively characterized at the atomic level of an entire CRL1 complex106,117.”

    From PROTAC targeted protein degraders: the past is prologue (2022) · cites this paper as [117]

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Authors
Horn-Ghetko, D., Krist, D. T., Prabu, J. R., Baek, K., Mulder, M. P. C., Klügel, M., Scott, D. C., Ovaa, H., Kleiger, G., & Schulman, B. A.
Affiliations
  • Max Planck Institute of Biochemistry (DE)
  • Leiden University Medical Center (NL)
  • St. Jude Children's Research Hospital (US)
  • University of Nevada, Las Vegas (US)
Corresponding author
Schulman, Brenda A.
Venue
Nature
Published
2021-02-03
Volume
590
Issue
7847
Pages
671-676
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W3129120649
Cited by
187
References
71
Citations by year
2026: 22 · 2025: 32 · 2024: 51 · 2023: 28 · 2022: 35 · 2021: 18 · 2014: 1
FWCI
10.44
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Digital Scholarship - UNLV (University of Nevada Reno) (submittedVersion, cc-by)
  • Data Archiving and Networked Services (DANS) (submittedVersion, cc-by)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Leiden Repository (Leiden University) (submittedVersion, cc-by)
Funders
  • American Lebanese Syrian Associated Charities
  • Deutsche Forschungsgemeinschaft (SCHU 3196/1‐1, SCHU 3196/1)
  • Max-Planck-Gesellschaft
  • National Institutes of Health (H2020)
  • Horizon 2020 Framework Programme (789016-NEDD8Activate)
  • Leibniz-Gemeinschaft
  • National Institute of General Medical Sciences (R15GM117555)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Degradation and Inhibitors
  • Physical Sciences › Materials Science › Materials Chemistry › Enzyme Structure and Function
Keywords
E3 ubiquitin ligase, F-box protein, UBE2L3, ubiquitin transfer, cryo-electron microscopy, substrate recognition
MeSH terms
Allosteric Regulation, Humans, Phosphorylation, Substrate Specificity, Cyclin E, Cryoelectron Microscopy, Ubiquitin, Ubiquitin-Conjugating Enzymes, Ubiquitin-Protein Ligases, F-Box Proteins, SKP Cullin F-Box Protein Ligases, Ubiquitination, Biocatalysis

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