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Structural basis of Keap1 interactions with Nrf2.

Peter Canning1, Fiona J Sorrell1, Alex N Bullock1

  • 1Structural Genomics Consortium, University of Oxford, Old Road Campus, Oxford OX3 7DQ, UK.

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|June 10, 2015
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Summary

The Keap1-Nrf2 system regulates stress response genes. Inhibiting this interaction stabilizes Nrf2, offering therapeutic potential for neurodegeneration, inflammation, and cancer.

Keywords:
BTBCullinFree radicalsKeap1KelchNrf2Ubiquitin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Keap1 (Kelch-like ECH-associated protein 1) is a redox-sensitive protein crucial for regulating Nrf2 (Nuclear factor erythroid 2-related factor 2) stability.
  • The Keap1-Nrf2 pathway controls the cellular response to oxidative stress by modulating the expression of antioxidant and cytoprotective genes.
  • Dysregulation of the Keap1-Nrf2 pathway is implicated in various diseases, including neurodegenerative disorders, inflammatory conditions, and cancer.

Purpose of the Study:

  • To review the current structural understanding of the Keap1 protein and its complexes.
  • To elucidate the structural basis for Nrf2 recognition and ubiquitination by the Keap1-Cul3 E3 ligase complex.
  • To highlight the implications of structural insights for the development of therapeutic agents targeting the Keap1-Nrf2 interaction.

Main Methods:

  • Structural biology techniques, including X-ray crystallography and cryo-electron microscopy, were employed to determine the three-dimensional structures of Keap1 and its complexes.
  • Biochemical assays were used to investigate the binding interactions between Keap1, Cul3, Nrf2, and small-molecule modulators.
  • Computational modeling was utilized to rationalize the observed structural data and binding mechanisms.

Main Results:

  • Available structural data provide a comprehensive three-dimensional model of the Keap1-Cul3 E3 ligase complex.
  • The structures reveal the molecular details of the two-site binding mechanism of the Nrf2 substrate to Keap1.
  • Structural insights explain the efficient ubiquitination of Nrf2 mediated by the complex.

Conclusions:

  • The structural characterization of the Keap1-Nrf2 system provides a rational basis for understanding Nrf2 regulation.
  • This knowledge facilitates the rational design of small-molecule inhibitors that disrupt Keap1-Nrf2 interaction, stabilizing Nrf2.
  • Targeting the Keap1-Nrf2 pathway holds significant therapeutic promise for diseases associated with oxidative stress and inflammation.