Cited by 199Genomics, phytochemicals, and oxidative stressUbiquitin and proteasome pathwaysRedox biology and oxidative stress

PGAM5, a Bcl-XL-interacting protein, is a novel substrate for the redox-regulated Keap1-dependent ubiquitin ligase complex

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Lo, Shih-Ching, Hannink, Mark·2006·Journal of Biological Chemistry

Abstract

Keap1 is a BTB-Kelch substrate adaptor protein for a Cul3-dependent ubiquitin ligase complex that functions as a sensor for thiol-reactive chemopreventive compounds and oxidative stress. Inhibition of Keap1-dependent ubiquitination of the bZIP transcription factor Nrf2 enables Nrf2 to activate a cyto-protective transcriptional program that counters the damaging effects of oxidative stress. In this report we have identified a member of the phosphoglycerate mutase family, PGAM5, as a novel substrate for Keap1. The N terminus of the PGAM5 protein contains a conserved NXESGE motif that binds to the substrate binding pocket in the Kelch domain of Keap1, whereas the C-terminal PGAM domain binds Bcl-X(L). Keap1-dependent ubiquitination of PGAM5 results in proteasome-dependent degradation of PGAM5. Quinone-induced oxidative stress and the chemopreventive agent sulforaphane inhibit Keap1-dependent ubiquitination of PGAM5. The identification of PGAM5 as a novel substrate of Keap1 suggests that Keap1 regulates both transcriptional and post-transcriptional responses of mammalian cells to oxidative stress.

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  • PGAM5 can recruit both Keap1 and Nrf2 to the outer mitochondrial membrane to form a ternary Keap1-PGAM5-Nrf2 complex, resulting in stress-induced Keap1-mediated ubiquitination and degradation of Miro2 rather than Nrf2.

    “Interestingly, PGAM5 can recruit both Keap1 and Nrf2 to the outer mitochondrial membrane by binding to one molecule of a Keap1 dimer while simultaneously binding Nrf2 to form a ternary Keap1-PGAM5-Nrf2 complex [102,103]. Interestingly, this results in the stress-induced Keap1-mediated ubiquitination and degradation of not Nrf2, but of mitochondrial Rho GTPase 2 (Miro2), a mitochondrial GTPase inv”

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  1. Dinkova-Kostova, A. T., Holtzclaw, W. D., Cole, R. N., Itoh, K., Wakaba- yashi, N., Katoh, Y., Yamamoto, M., and Talalay, P. (2002) Proc. Natl. Acad. Sci. U. S. A. 99, 11908 -11913
  2. Eggler, A. L., Liu, G., Pezzuto, J. M., van Breemen, R. B., and Mesecar, A. D. (2005) Proc. Natl. Acad. Sci. U. S. A. 102, 10070 -10075
  3. Wakabayashi, N., Dinkova-Kostova, A. T., Holtzclaw, W. D., Kang, M. I., Kobayashi, A., Yamamoto, M., Kensler, T. W., and Talalay, P. (2004) Proc. Natl. Acad. Sci. U. S. A. 101, 2040 -2045
  4. Mathers, J., Fraser, J. A., McMahon, M., Saunders, R. D., Hayes, J. D., and McLellan, L. I. (2004) Biochem. Soc. Symp. 71, 157-176

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Authors
Lo, S.-C., & Hannink, M.
Affiliations
University of Missouri (US)
Corresponding author
Hannink, Mark
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2006-12
Volume
281
Issue
49
Pages
37893-37903
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2113074658
Cited by
199
References
47
Citations by year
2026: 2 · 2025: 6 · 2024: 11 · 2023: 8 · 2022: 12 · 2021: 12 · 2020: 16 · 2019: 11 · 2018: 12 · 2017: 15 · 2016: 13 · 2015: 12 · 2014: 12 · 2013: 13 · 2012: 10
FWCI
1.63
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • National Center for Complementary and Integrative Health (R01AT003899)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics, phytochemicals, and oxidative stress
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ubiquitin and proteasome pathways
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
Keywords
PGAM5, phosphoglycerate mutase, Keap1, Bcl-xL, Kelch domain, substrate binding pocket, Nrf2, oxidative stress, quinones, sulforaphane, proteasomal degradation, post-transcriptional regulation, chemoprevention
MeSH terms
Kelch-Like ECH-Associated Protein 1, Amino Acid Sequence, Animals, Autoantigens, Binding Sites, Cell Line, Chlorocebus aethiops, Humans, Membrane Proteins, Molecular Sequence Data, Oxidation-Reduction, Phylogeny, Recombinant Proteins, Substrate Specificity, Transfection, Sequence Homology, Amino Acid, Cell Cycle Proteins, COS Cells, Amino Acid Motifs, Ubiquitin-Protein Ligases, Intracellular Signaling Peptides and Proteins, bcl-X Protein

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