Cited by 300Genomics, phytochemicals, and oxidative stressRedox biology and oxidative stressGlutathione Transferases and Polymorphisms

PGAM5 tethers a ternary complex containing Keap1 and Nrf2 to mitochondria

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Lo, Shih-Ching, Hannink, Mark·2008·Experimental Cell Research

Abstract

Eukaryote cells balance production of reactive oxygen species (ROS) with levels of anti-oxidant enzyme activity to maintain cellular redox homeostasis. Mitochondria are a major source of ROS, while many anti-oxidant genes are regulated by the Nrf2 transcription factor. Keap1, a redox-regulated substrate adaptor for a cullin-based ubiquitin ligase, targets Nrf2 for proteosome-mediated degradation and represses Nrf2-dependent gene expression. We have previously identified a member of the phosphoglycerate mutase family, PGAM5, as a Keap1-binding protein. In this report, we demonstrate that PGAM5 is targeted to the outer membrane of mitochondria by an N-terminal mitochondrial-localization sequence. Furthermore, we provide evidence that PGAM5 forms a ternary complex containing both Keap1 and Nrf2, in which the dimeric Keap1 protein simultaneously binds both PGAM5 and Nrf2 through their conserved E(S/T)GE motifs. Knockdown of either Keap1 or PGAM5 activates Nrf2-dependent gene expression. We suggest that this ternary complex provides a molecular framework for understanding how nuclear anti-oxidant gene expression is regulated in response to changes in mitochondrial function(s).

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Crossref · 10.1016/j.yexcr.2008.02.014

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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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Authors
Lo, S.-C., & Hannink, M.
Affiliations
University of Missouri (US)
Corresponding author
Hannink, Mark
Venue
Experimental Cell Research
Publisher
Elsevier BV
Published
2008-05
Volume
314
Issue
8
Pages
1789-1803
ISSN
0014-4827 (ISSN-L)
OpenAlex
W1974124666
Cited by
300
References
82
Citations by year
2026: 10 · 2025: 13 · 2024: 19 · 2023: 22 · 2022: 22 · 2021: 29 · 2020: 29 · 2019: 15 · 2018: 18 · 2017: 17 · 2016: 19 · 2015: 17 · 2014: 16 · 2013: 14 · 2012: 17
FWCI
2.88
Type
journal article
Language
en
Open access
Locations
  • Experimental Cell Research (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (1 RO1 AT003389)
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 › Molecular Biology › Glutathione Transferases and Polymorphisms
Keywords
PGAM5, Keap1, Nrf2, ternary complex, mitochondrial outer membrane, redox homeostasis, reactive oxygen species, antioxidant gene expression, proteasomal degradation
MeSH terms
Kelch-Like ECH-Associated Protein 1, Amino Acid Sequence, Animals, Carrier Proteins, Cell Line, Cell Nucleus, Gene Expression Regulation, Humans, Mitochondria, Molecular Sequence Data, Phosphoglycerate Mutase, Phosphoprotein Phosphatases, Protein Isoforms, Protein Sorting Signals, Mitochondrial Proteins, Intracellular Signaling Peptides and Proteins, NF-E2-Related Factor 2

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