Cited by 795Sirtuins and Resveratrol in MedicineBiochemical and Molecular ResearchAmino Acid Enzymes and Metabolism

SIRT5 deacetylates carbamoyl phosphate synthetase 1 and regulates the urea cycle

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Nakagawa, Takashi, Lomb, David J., Haigis, Marcia C., Guarente, Leonard·2009·Cell

Abstract

Sirtuins are NAD-dependent protein deacetylases that connect metabolism and aging. In mammals, there are seven sirtuins (SIRT1-7), three of which are associated with mitochondria. Here, we show that SIRT5 localizes in the mitochondrial matrix and interacts with carbamoyl phosphate synthetase 1 (CPS1), an enzyme, catalyzing the initial step of the urea cycle for ammonia detoxification and disposal. SIRT5 deacetylates CPS1 and upregulates its activity. During fasting, NAD in liver mitochondria increases, thereby triggering SIRT5 deacetylation of CPS1 and adaptation to the increase in amino acid catabolism. Indeed, SIRT5 KO mice fail to upregulate CPS1 activity and show elevated blood ammonia during fasting. Similar effects occur during long-term calorie restriction or a high protein diet. These findings demonstrate SIRT5 plays a pivotal role in ammonia detoxification and disposal by activating CPS1.

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Crossref · 10.1016/j.cell.2009.02.026

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  1. Nuzum C Snodgrass P Grisolia S Baguena R Mayor F 1976 Multiple Assays of the Five Urea-cycle Enzymes in Human Liver Homogenates The Urea Cycle New York Wiley 325 349

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Authors
Nakagawa, T., Lomb, D. J., Haigis, M. C., & Guarente, L.
Affiliations
  • Massachusetts Institute of Technology (US)
  • Harvard University (US)
Corresponding author
Guarente, Leonard
Venue
Cell
Publisher
Elsevier BV
Published
2009-05
Volume
137
Issue
3
Pages
560-570
ISSN
0092-8674 (ISSN-L)
OpenAlex
W2059750004
Cited by
787
References
57
Citations by year
2026: 26 · 2025: 39 · 2024: 35 · 2023: 32 · 2022: 49 · 2021: 54 · 2020: 40 · 2019: 43 · 2018: 53 · 2017: 41 · 2016: 53 · 2015: 51 · 2014: 43 · 2013: 61 · 2012: 59
FWCI
39.82
Type
journal article
Language
en
Open access
Locations
  • Cell (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc)
Funders
National Institute on Aging (R01AG015339, R01AG011119)
Topics
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Biochemical and Molecular Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
Keywords
SIRT5, CPS1, urea cycle, protein deacetylation, ammonia detoxification, fasting, caloric restriction, high-protein diet, mitochondrial matrix, sirtuins, NAD+ metabolism, amino acid catabolism, blood ammonia
MeSH terms
Ammonia, Animals, Carbamoyl-Phosphate Synthase (Ammonia), Cells, Cultured, Enzyme Activation, Humans, Mitochondria, Liver, Substrate Specificity, Mitochondrial Proteins, Sirtuins, Mice

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