Cited by 296Genomics, phytochemicals, and oxidative stressRedox biology and oxidative stressNF-κB Signaling Pathways

Characterizations of Three Major Cysteine Sensors of Keap1 in Stress Response

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Saito, Ryota, Suzuki, Takafumi, Hiramoto, Keiichiro, Asami, Soichiro, Naganuma, Eriko, Suda, Hiromi, Iso, Tatsuro, Yamamoto, Hirotaka +6 more·2016·Molecular and Cellular Biology

Abstract

The Keap1-Nrf2 system plays a central role in cytoprotection against electrophilic/oxidative stresses. Although Cys151, Cys273, and Cys288 of Keap1 are major sensor cysteine residues for detecting these stresses, it has not been technically feasible to evaluate the functionality of Cys273 or Cys288, since Keap1 mutants that harbor substitutions in these residues and maintain the ability to repress Nrf2 accumulation do not exist. To overcome this problem, we systematically introduced amino acid substitutions into Cys273/Cys288 and finally identified Cys273Trp and Cys288Glu mutations that do not affect Keap1's ability to repress Nrf2 accumulation. Utilizing these Keap1 mutants, we generated stable murine embryonic fibroblast (MEF) cell lines and knock-in mouse lines. Our analyses with the MEFs and peritoneal macrophages from the knock-in mice revealed that three major cysteine residues, Cys151, Cys273, and Cys288, individually and/or redundantly act as sensors. Based on the functional necessity of these three cysteine residues, we categorized chemical inducers of Nrf2 into four classes. Class I and II utilizes Cys151 and Cys288, respectively, while class III requires all three residues (Cys151/Cys273/Cys288), while class IV inducers function independently of all three of these cysteine residues. This study thus demonstrates that Keap1 utilizes multiple cysteine residues specifically and/or collaboratively as sensors for the detection of a wide range of environmental stresses.

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Authors
Saito, R., Suzuki, T., Hiramoto, K., Asami, S., Naganuma, E., Suda, H., Iso, T., Yamamoto, H., Morita, M., Baird, L., Furusawa, Y., Negishi, T., Ichinose, M., & Yamamoto, M.
Affiliations
  • Tohoku University (JP)
  • Mochida Pharmaceutical (Japan) (JP)
Corresponding author
  • Suzuki, Takafumi
  • Yamamoto, Masayuki
Venue
Molecular and Cellular Biology
Published
2016-01-01
Volume
36
Issue
2
Pages
271-284
ISSN
  • 0270-7306 (ISSN-L)
  • 1098-5549
OpenAlex
W2202703189
Cited by
294
References
47
Citations by year
2026: 30 · 2025: 30 · 2024: 23 · 2023: 26 · 2022: 36 · 2021: 21 · 2020: 48 · 2019: 24 · 2018: 28 · 2017: 14 · 2016: 14
FWCI
8.25
Type
journal article
Language
en
Open access
Locations
  • Molecular and Cellular Biology (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • P-DIRECT
  • Ministry of Education, Culture, Sports, Science, and Technology (24249015, 26111002, 26460354, 25112502, 2611010)
  • Takeda Science Foundation
  • AMED-CREST, Japan Agency for Medical Research and Development
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 › Cancer Research › NF-κB Signaling Pathways
Keywords
Keap1, Nrf2, oxidative stress, electrophilic stress, Nrf2 inducers, peritoneal macrophages, murine embryonic fibroblasts, cytoprotection
MeSH terms
Kelch-Like ECH-Associated Protein 1, Amino Acid Sequence, Animals, Cell Line, Cysteine, Cytoskeletal Proteins, Humans, Mice, Transgenic, Molecular Sequence Data, Mutation, Transfection, Sequence Alignment, Oxidative Stress, Amino Acid Substitution, Intracellular Signaling Peptides and Proteins, Adaptor Proteins, Signal Transducing, NF-E2-Related Factor 2, Mice, HEK293 Cells

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