An exceptionally potent inducer of cytoprotective enzymes: Elucidation of the structural features that determine inducer potency and reactivity with Keap1

Albena T. Dinkova-Kostova, Paul Talalay, John Sharkey, Ying Zhang, W. David Holtzclaw, Xiu Jun Wang, Emilie David, Katherine H. Schiavoni, Stewart Finlayson, Dale F. Mierke, Tadashi Honda

Research output: Contribution to journalArticle

Abstract

The Keap1/Nrf2/ARE pathway controls a network of cytoprotective genes that defend against the damaging effects of oxidative and electrophilic stress, and inflammation. Induction of this pathway is a highly effective strategy in combating the risk of cancer and chronic degenerative diseases, including atherosclerosis and neurodegeneration. An acetylenic tricyclic bis(cyano enone) bearing two highly electrophilic Michael acceptors is an extremely potent inducer in cells and in vivo. We demonstrate spectroscopically that both cyano enone functions of the tricyclic molecule react with cysteine residues of Keap1 and activate transcription of cytoprotective genes. Novel monocyclic cyano enones, representing fragments of rings A and C of the tricyclic compound, reveal that the contribution to inducer potency of the ring C Michael acceptor is much greater than that of ring A, and that potency is further enhanced by spatial proximity of an acetylenic function. Critically, the simultaneous presence of two cyano enone functions in rings A and C within a rigid three-ring system results in exceptionally high inducer potency. Detailed understanding of the structural elements that contribute to the reactivity with the protein sensor Keap1 and to high potency of induction is essential for the development of specific and selective lead compounds as clinically relevant chemoprotective agents.

Original languageEnglish (US)
Pages (from-to)33747-33755
Number of pages9
JournalJournal of Biological Chemistry
Volume285
Issue number44
DOIs
StatePublished - Oct 29 2010

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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    Dinkova-Kostova, A. T., Talalay, P., Sharkey, J., Zhang, Y., Holtzclaw, W. D., Wang, X. J., David, E., Schiavoni, K. H., Finlayson, S., Mierke, D. F., & Honda, T. (2010). An exceptionally potent inducer of cytoprotective enzymes: Elucidation of the structural features that determine inducer potency and reactivity with Keap1. Journal of Biological Chemistry, 285(44), 33747-33755. https://doi.org/10.1074/jbc.M110.163485