Cited by 531Sirtuins and Resveratrol in MedicineMitochondrial Function and PathologyAutophagy in Disease and Therapy

Substrates and regulation mechanisms for the human mitochondrial sirtuins Sirt3 and Sirt5

Schlicker, Christine, Gertz, Melanie, Papatheodorou, Panagiotis, Kachholz, Barbara, Becker, Christian F.W., Steegborn, Clemens·2008·Journal of Molecular Biology

Abstract

The enzymes of the Sirtuin family of nicotinamide-adenine-dinucleotide-dependent protein deacetylases are emerging key players in nuclear and cytosolic signaling, but also in mitochondrial regulation and aging. Mammalian mitochondria contain three Sirtuins, Sirt3, Sirt4, and Sirt5. Only one substrate is known for Sirt3 as well as for Sirt4, and up to now, no target for Sirt5 has been reported. Here, we describe the identification of novel substrates for the human mitochondrial Sirtuin isoforms Sirt3 and Sirt5. We show that Sirt3 can deacetylate and thereby activate a central metabolic regulator in the mitochondrial matrix, glutamate dehydrogenase. Furthermore, Sirt3 deacetylates and activates isocitrate dehydrogenase 2, an enzyme that promotes regeneration of antioxidants and catalyzes a key regulation point of the citric acid cycle. Sirt3 thus can regulate flux and anapleurosis of this central metabolic cycle. We further find that the N- and C-terminal regions of Sirt3 regulate its activity against glutamate dehydrogenase and a peptide substrate, indicating roles for these regions in substrate recognition and Sirtuin regulation. Sirt5, in contrast to Sirt3, deacetylates none of the mitochondrial matrix proteins tested. Instead, it can deacetylate cytochrome c, a protein of the mitochondrial intermembrane space with a central function in oxidative metabolism, as well as apoptosis initiation. Using a mitochondrial import assay, we find that Sirt5 can indeed be translocated into the mitochondrial intermembrane space, but also into the matrix, indicating that localization might contribute to Sirt5 regulation and substrate selection.

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Crossref · 10.1016/j.jmb.2008.07.048

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Authors
Schlicker, C., Gertz, M., Papatheodorou, P., Kachholz, B., Becker, C. F. W., & Steegborn, C.
Affiliations
  • Ruhr University Bochum (DE)
  • Max Planck Institute of Molecular Physiology (DE)
Corresponding author
Steegborn, Clemens
Venue
Journal of Molecular Biology
Publisher
Elsevier BV
Published
2008-10
Volume
382
Issue
3
Pages
790-801
ISSN
0022-2836 (ISSN-L)
OpenAlex
W2042710774
Cited by
531
References
55
Citations by year
2026: 7 · 2025: 17 · 2024: 17 · 2023: 25 · 2022: 19 · 2021: 36 · 2020: 27 · 2019: 16 · 2018: 32 · 2017: 22 · 2016: 41 · 2015: 25 · 2014: 29 · 2013: 52 · 2012: 42
FWCI
16.86
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular Biology (publishedVersion)
  • PubMed (publishedVersion)
  • DORA PSI (Paul Scherrer Institute) (submittedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • ERef Bayreuth (University of Bayreuth) (submittedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Topics
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Epidemiology › Autophagy in Disease and Therapy
Keywords
SIRT3, SIRT5, SIRT4, mitochondrial sirtuins, glutamate dehydrogenase, IDH2, cytochrome c, substrate recognition, mitochondrial matrix, mitochondrial intermembrane space, TCA cycle, mitochondrial protein import, aging, apoptosis
MeSH terms
Acetylation, Animals, Enzyme Activation, Fumarate Hydratase, Glutamate Dehydrogenase, Humans, Isocitrate Dehydrogenase, Mitochondria, Models, Molecular, Peptides, Substrate Specificity, Protein Structure, Tertiary, Protein Isoforms, Mitochondrial Proteins, Sirtuins, Cytochromes c, Sirtuin 3

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