Cited by 901Sirtuins and Resveratrol in MedicineRedox biology and oxidative stressAutophagy in Disease and Therapy

Sirt3-mediated deacetylation of evolutionarily conserved lysine 122 regulates MnSOD activity in response to stress

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Tao, Randa, Coleman, Mitchell C., Pennington, J. Daniel, Ozden, Ozkan, Park, Seong-Hoon, Jiang, Haiyan, Kim, Hyun-Seok, Flynn, Charles Robb +5 more·2010·Molecular Cell

Abstract

Genetic deletion of the mitochondrial deacetylase sirtuin-3 (Sirt3) results in increased mitochondrial superoxide, a tumor-permissive environment, and mammary tumor development. MnSOD contains a nutrient- and ionizing radiation (IR)-dependent reversible acetyl-lysine that is hyperacetylated in Sirt3⁻/⁻ livers at 3 months of age. Livers of Sirt3⁻/⁻ mice exhibit decreased MnSOD activity, but not immunoreactive protein, relative to wild-type livers. Reintroduction of wild-type but not deacetylation null Sirt3 into Sirt3⁻/⁻ MEFs deacetylated lysine and restored MnSOD activity. Site-directed mutagenesis of MnSOD lysine 122 to an arginine, mimicking deacetylation (lenti-MnSOD(K122-R)), increased MnSOD activity when expressed in MnSOD⁻/⁻ MEFs, suggesting acetylation directly regulates function. Furthermore, infection of Sirt3⁻/⁻ MEFs with lenti-MnSOD(K122-R) inhibited in vitro immortalization by an oncogene (Ras), inhibited IR-induced genomic instability, and decreased mitochondrial superoxide. Finally, IR was unable to induce MnSOD deacetylation or activity in Sirt3⁻/⁻ livers, and these irradiated livers displayed significant IR-induced cell damage and microvacuolization in their hepatocytes.

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Authors
Tao, R., Coleman, M. C., Pennington, J. D., Ozden, O., Park, S.-H., Jiang, H., Kim, H.-S., Flynn, C. R., Hill, S., Hayes McDonald, W., Olivier, A. K., Spitz, D. R., & Gius, D.
Affiliations
  • National Institutes of Health (US)
  • University of Iowa (US)
  • Vanderbilt University Medical Center (US)
  • Vanderbilt University (US)
Corresponding author
Gius, David
Venue
Molecular Cell
Publisher
Elsevier BV
Published
2010-12
Volume
40
Issue
6
Pages
893-904
ISSN
1097-2765 (ISSN-L)
OpenAlex
W2039374791
Cited by
899
References
24
Citations by year
2026: 28 · 2025: 35 · 2024: 36 · 2023: 44 · 2022: 48 · 2021: 72 · 2020: 64 · 2019: 66 · 2018: 62 · 2017: 80 · 2016: 71 · 2015: 61 · 2014: 64 · 2013: 68 · 2012: 58
FWCI
21.31
Type
journal article
Language
en
Open access
Locations
  • Molecular Cell (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institute on Aging (F30AG030839)
  • National Cancer Institute (P50 CA98131, R01CA133114, R01CA152601, P50CA098131, T32CA078586, P30CA086862)
Topics
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Redox biology and oxidative stress
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
SIRT3, manganese superoxide dismutase, protein acetylation, deacetylation, mitochondrial superoxide, ionizing radiation, radiation-induced genomic instability, oncogenic Ras, mammary tumors, liver, hepatocyte injury, mitochondrial deacetylase, tumor microenvironment
MeSH terms
Acetylation, Animals, Arginine, Cell Line, Lysine, Superoxide Dismutase, Mutagenesis, Site-Directed, Conserved Sequence, Oxidative Stress, Evolution, Molecular, Mice, Sirtuin 3

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