Cited by 480Genomics, phytochemicals, and oxidative stressRedox biology and oxidative stressNF-κB Signaling Pathways

Two-site substrate recognition model for the Keap1-Nrf2 system: A hinge and latch mechanism

Tong, Kit I., Kobayashi, Akira, Katsuoka, Fumiki, Yamamoto, Masayuki·2006·Biological Chemistry

Abstract

Cells are equipped with a number of transcriptional factors that safeguard against various environmental insults. Proteasomal protein degradation plays an important role in the Keap1-Nrf2 cytoprotection system, with molecular machinery similar to that for other environmental defense systems such as inflammatory and hypoxic responses. While Nrf2 protein stabilization is known to be redox-sensitive, the transcription factors NF-kappaB and HIF-1alpha for inflammatory and hypoxic responses, respectively, are also influenced by the cellular redox conditions. In this review we present the recently proposed two-site substrate recognition model of the Keap1-Nrf2 system, which regulates the cellular responses against oxidative and xenobiotic stresses. The implications of two destructive motifs in Nrf2, the ETGE and DLG motifs, which appear to function as a hinge and latch attenuating Keap1 activity in different redox states, are discussed.

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Crossref · 10.1515/bc.2006.164

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  • The Neh2 domain is a redox-sensitive degron that negatively regulates Nrf2 activity and contains DLG and ETGE motifs to which Keap1 binds, as well as lysine residues targeted for ubiquitination.

    “The N-terminal Neh2 domain is a redox-sensitive degron that negatively regulates Nrf2 activity and contains two highly conserved 29DLG31 and 79ETGE82 motifs to which Keap1 binds, as well as seven lysine residues that are targets for ubiquitination by the Cul3 E3 ubiquitin ligase [49,65].”
  • Keap1 recruits Nrf2 first through binding of one Keap1 molecule to the high-affinity ETGE motif, and subsequent binding of the other Keap1 molecule at the low-affinity DLG motif locks Nrf2 in place for ubiquitination by Cul3 and degradation by the 26S proteasome.

    “Keap1 recruits Nrf2 first through the binding of one Keap1 molecule to the high-affinity ETGE motif within the Nrf2’s Neh2 domain. Subsequent binding of the other Keap1 molecule at the low-affinity DLG motif locks Nrf2 in place by orienting the lysine residues within Neh2 in the correct position for ubiquitination by Cul3 and degradation by the 26S proteasome [58,65].”

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Authors
Tong, K. I., Kobayashi, A., Katsuoka, F., & Yamamoto, M.
Affiliations
University of Tsukuba (JP)
Venue
Biological Chemistry
Published
2006-01-01
Volume
387
Issue
10/11
Pages
1311-20
ISSN
  • 1431-6730 (ISSN-L)
  • 1437-4315
OpenAlex
W2094661084
Cited by
473
References
78
Citations by year
2026: 10 · 2025: 13 · 2024: 14 · 2023: 26 · 2022: 24 · 2021: 24 · 2020: 37 · 2019: 24 · 2018: 24 · 2017: 30 · 2016: 28 · 2015: 32 · 2014: 32 · 2013: 29 · 2012: 21
FWCI
1.41
Type
journal article
Language
en
Open access
closed
Locations
  • Biological Chemistry (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 › Redox biology and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › NF-κB Signaling Pathways
Keywords
Nrf2, Keap1, redox regulation, protein degradation, oxidative stress, xenobiotic stress, proteasome, transcriptional regulation, cytoprotection
MeSH terms
Animals, Humans, Models, Biological, Protein Binding, Substrate Specificity, Proteasome Endopeptidase Complex, Intracellular Signaling Peptides and Proteins, NF-E2-Related Factor 2

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