Cited by 2,224Genomics, phytochemicals, and oxidative stressUbiquitin and proteasome pathwaysRedox biology and oxidative stress

Oxidative stress sensor Keap1 functions as an adaptor for Cul3-based E3 ligase to regulate proteasomal degradation of Nrf2

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Kobayashi, Akira, Kang, Moon-Il, Okawa, Hiromi, Ohtsuji, Makiko, Zenke, Yukari, Chiba, Tomoki, Igarashi, Kazuhiko, Yamamoto, Masayuki·2004·Molecular and Cellular Biology

Abstract

Transcription factor Nrf2 is a major regulator of genes encoding phase 2 detoxifying enzymes and antioxidant stress proteins in response to electrophilic agents and oxidative stress. In the absence of such stimuli, Nrf2 is inactive owing to its cytoplasmic retention by Keap1 and rapid degradation through the proteasome system. We examined the contribution of Keap1 to the rapid turnover of Nrf2 (half-life of less than 20 min) and found that a direct association between Keap1 and Nrf2 is required for Nrf2 degradation. In a series of domain function analyses of Keap1, we found that both the BTB and intervening-region (IVR) domains are crucial for Nrf2 degradation, implying that these two domains act to recruit ubiquitin-proteasome factors. Indeed, Cullin 3 (Cul3), a subunit of the E3 ligase complex, was found to interact specifically with Keap1 in vivo. Keap1 associates with the N-terminal region of Cul3 through the IVR domain and promotes the ubiquitination of Nrf2 in cooperation with the Cul3-Roc1 complex. These results thus provide solid evidence that Keap1 functions as an adaptor of Cul3-based E3 ligase. To our knowledge, Nrf2 and Keap1 are the first reported mammalian substrate and adaptor, respectively, of the Cul3-based E3 ligase system.

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Crossref · 10.1128/mcb.24.16.7130-7139.2004

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  • Nrf2 is negatively regulated by Keap1, which binds Nrf2 in the cytosol to facilitate its polyubiquitination by the Cul3 E3 ubiquitin ligase for proteasomal degradation.

    “Nrf2 regulates the expression of a multitude of antioxidant and phase II enzyme genes and is negatively regulated by Kelch-like ECH-associated protein (Keap1) [49], a substrate adaptor protein that binds to Nrf2 in the cytosol to facilitate its polyubiquitination by the Cullin 3 (Cul3) E3 ubiquitin ligase for proteasomal degradation [50,51,52].”
  • The mechanism by which rapamycin increases Nrf2 levels seems to occur at the level of protein stabilization rather than increasing Nrf2 gene expression.

    “The actual mechanism by which rapamycin increases Nrf2 levels is not completely elucidated; however, this seems to occur at the level of protein stabilization rather than increasing Nrf2 gene expression because rapamycin did not increase Nrf2 mRNA levels, but decreased Keap1, a protein that triggers Nrf2 degradation (Kobayashi et al., 2004).”

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Authors
Kobayashi, A., Kang, M.-I., Okawa, H., Ohtsuji, M., Zenke, Y., Chiba, T., Igarashi, K., & Yamamoto, M.
Affiliations
  • University of Tsukuba (JP)
  • Hiroshima University (JP)
  • Tokyo Metropolitan Institute of Medical Science (JP)
Corresponding author
Yamamoto, Masayuki
Venue
Molecular and Cellular Biology
Published
2004-08-01
Volume
24
Issue
16
Pages
7130-7139
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2155324869
Cited by
2,224
References
33
Citations by year
2026: 100 · 2025: 102 · 2024: 116 · 2023: 137 · 2022: 154 · 2021: 123 · 2020: 182 · 2019: 121 · 2018: 122 · 2017: 122 · 2016: 140 · 2015: 132 · 2014: 95 · 2013: 100 · 2012: 84
FWCI
14.20
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
Keap1, Nrf2, CUL3, E3 ubiquitin ligase, adaptor proteins, proteasomal degradation, ubiquitination, BTB domain, ROC1, oxidative stress, antioxidant response
MeSH terms
Kelch-Like ECH-Associated Protein 1, Animals, Cell Line, Cysteine Endopeptidases, DNA-Binding Proteins, Humans, Multienzyme Complexes, Proteins, Recombinant Fusion Proteins, Transcription Factors, Trans-Activators, Protein Structure, Tertiary, Oxidative Stress, Cell Cycle Proteins, Ubiquitin, Ubiquitin-Protein Ligases, Cullin Proteins, Macromolecular Substances, Proteasome Endopeptidase Complex, Intracellular Signaling Peptides and Proteins, Basic-Leucine Zipper Transcription Factors, NF-E2-Related Factor 2, Mice, Fanconi Anemia Complementation Group Proteins

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