Cited by 1,480Genomics, phytochemicals, and oxidative stressRedox biology and oxidative stressGlutathione Transferases and Polymorphisms

Distinct cysteine residues in Keap1 are required for Keap1-dependent ubiquitination of Nrf2 and for stabilization of Nrf2 by chemopreventive agents and oxidative stress

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Zhang, Donna D., Hannink, Mark·2003·Molecular and Cellular Biology

Abstract

A common feature of diverse chemopreventive agents is the ability to activate expression of a genetic program that protects cells from reactive chemical species that, if left unchecked, would cause mutagenic DNA damage. The bZIP transcription factor Nrf2 has emerged as a key regulator of this cancer-preventive genetic program. Nrf2 is normally sequestered in the cytoplasm by a protein known as Keap1. Chemopreventive agents allow Nrf2 to escape from Keap1-mediated repression, although the molecular mechanism(s) responsible for activation of Nrf2 is not understood. In this report, we demonstrate that Keap1 does not passively sequester Nrf2 in the cytoplasm but actively targets Nrf2 for ubiquitination and degradation by the proteosome under basal culture conditions. We have identified two critical cysteine residues in Keap1, C273 and C288, that are required for Keap1-dependent ubiquitination of Nrf2. Both sulforaphane, a chemopreventive isothiocyanate, and oxidative stress enable Nrf2 to escape Keap1-dependent degradation, leading to stabilization of Nrf2, increased nuclear localization of Nrf2, and activation of Nrf2-dependent cancer-protective genes. We have identified a third cysteine residue in Keap1, C151, that is uniquely required for inhibition of Keap1-dependent degradation of Nrf2 by sulforaphane and oxidative stress. This cysteine residue is also required for a novel posttranslational modification to Keap1 that is induced by oxidative stress. We propose that Keap1 is a component of a novel E3 ubiquitin ligase complex that is specifically targeted for inhibition by both chemopreventive agents and oxidative stress.

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Crossref · 10.1128/mcb.23.22.8137-8151.2003

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  • Cys273 and Cys288 are required for sensing oxidative stress under both basal and stress conditions, whereas Cys151 may be required only during oxidative stress conditions.

    “Cys273 and Cys288 are required for sensing oxidative stress under both basal and stress conditions, whereas Cys151 may be required only during oxidative stress conditions [53,54].”

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  1. [11]Guyton, K. Z., and T. W. Kensler. 2000. Chemoprotection by phase 2 enzyme induction, p. 54-68. In G. M. Williams and O. I. Aruoma (ed.), Molecular drug metabolism in toxicology. OICA International Ltd., London, United Kindgom.
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Authors
Zhang, D. D., & Hannink, M.
Affiliations
University of Missouri (US)
Venue
Molecular and Cellular Biology
Published
2003-11-01
Volume
23
Issue
22
Pages
8137-8151
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2130029858
Cited by
1,480
References
43
Citations by year
2026: 65 · 2025: 69 · 2024: 68 · 2023: 73 · 2022: 83 · 2021: 87 · 2020: 101 · 2019: 70 · 2018: 79 · 2017: 77 · 2016: 93 · 2015: 72 · 2014: 64 · 2013: 63 · 2012: 62
FWCI
11.15
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Missouri
  • National Institutes of Health
  • University of California, San Francisco
  • National Institute of General Medical Sciences (GM 59213, R01GM059213)
  • National Institute of Environmental Health Sciences (ES 11721, R21ES011721)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Glutathione Transferases and Polymorphisms
Keywords
Keap1, Nrf2, cysteine residues, ubiquitination, protein degradation, proteasome, chemoprevention, sulforaphane, oxidative stress, E3 ubiquitin ligase, protein stabilization, nuclear localization, post-translational modification
MeSH terms
Kelch-Like ECH-Associated Protein 1, Animals, Carrier Proteins, Cell Line, Cysteine, Cytoskeletal Proteins, DNA-Binding Proteins, Recombinant Proteins, Sulfoxides, Thiocyanates, Transcription, Genetic, Trans-Activators, Mutagenesis, Anticarcinogenic Agents, Sequence Deletion, Protein Structure, Tertiary, Isothiocyanates, Oxidative Stress, COS Cells, Ubiquitin, NIH 3T3 Cells, Adaptor Proteins, Signal Transducing, NF-E2-Related Factor 2, Mice

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