Cited by 558Heat shock proteins researchMitochondrial Function and PathologyAutophagy in Disease and Therapy

Lon protease preferentially degrades oxidized mitochondrial aconitase by an ATP-stimulated mechanism

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Bota, Daniela A., Davies, Kelvin J. A.·2002·Nature Cell Biology

Abstract

Mitochondrial aconitase is sensitive to oxidative inactivation and can aggregate and accumulate in many age-related disorders. Here we report that Lon protease, an ATP-stimulated mitochondrial matrix protein, selectively recognizes and degrades the oxidized, hydrophobic form of aconitase after mild oxidative modification, but that severe oxidation results in aconitase aggregation, which makes it a poor substrate for Lon. Similarly, a morpholino oligodeoxynucleotide directed against the lon gene markedly decreases the amount of Lon protein, Lon activity and aconitase degradation in WI-38 VA-13 human lung fibroblasts and causes accumulation of oxidatively modified aconitase. The ATP-stimulated Lon protease may be an essential defence against the stress of life in an oxygen environment. By recognizing minor oxidative changes to protein structure and rapidly degrading the mildly modified protein, Lon protease may prevent extensive oxidation, aggregation and accumulation of aconitase, which could otherwise compromise mitochondrial function and cellular viability. Aconitase is probably only one of many mitochondrial matrix proteins that are preferentially degraded by Lon protease after oxidative modification.

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Crossref · 10.1038/ncb836

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  • Aging is associated with impaired activity of the proteasome and mitochondrial Lon proteases and reduced capacity for macromolecule repair.

    “aging is associated with impaired activity of the proteasome and mitochondrial Lon proteases [203,204,205] and reduced capacity for macromolecule repair [201,202].”
  • In mammals, several mitochondrial regulatory proteins such as aconitase (ACO), cytochrome c oxidase isoform (Cox4i1), steroidogenic acute regulatory protein (STAR), and transcription factor A (TFAM) have been identified as LONP1 substrates under basal or stress conditions.

    “In mammals, several mitochondrial regulatory proteins such as aconitase (ACO), cytochrome c oxidase isoform (Cox4i1), steroidogenic acute regulatory protein (STAR), and transcription factor A (TFAM) have been identified as LONP1 substrates under basal or stress conditions2,4,16,17.”

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Authors
Bota, D. A., & Davies, K. J. A.
Affiliations
University of Southern California (US)
Corresponding author
Davies, Kelvin J. A.
Venue
Nature Cell Biology
Published
2002-08-27
Volume
4
Issue
9
Pages
674-680
ISSN
  • 1465-7392 (ISSN-L)
  • 1476-4679
OpenAlex
W2036284918
Cited by
557
References
53
Citations by year
2026: 15 · 2025: 21 · 2024: 15 · 2023: 19 · 2022: 21 · 2021: 21 · 2020: 21 · 2019: 18 · 2018: 32 · 2017: 26 · 2016: 24 · 2015: 25 · 2014: 25 · 2013: 31 · 2012: 45
FWCI
4.12
Type
journal article
Language
en
Open access
Locations
  • Nature Cell Biology (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • National Institutes of Health
  • National Institute on Aging (R01AG016256, AG16256)
  • National Institute of Environmental Health Sciences (ES03598)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Heat shock proteins research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
Lon protease, mitochondrial aconitase, protein oxidation, protein degradation, protein aggregation, mitochondrial matrix, oxidative stress, age-related diseases, WI-38 fibroblasts, mitochondrial function
MeSH terms
Aconitate Hydratase, Adenosine Triphosphate, Animals, Base Sequence, Cattle, Cell Line, Heat-Shock Proteins, Humans, Hydrogen Peroxide, Kinetics, Mitochondria, Mitochondria, Heart, Oxidation-Reduction, Serine Endopeptidases, Oligodeoxyribonucleotides, Antisense, ATP-Dependent Proteases, In Vitro Techniques

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