Cited by 1,364Sirtuins and Resveratrol in MedicineGenetics, Aging, and Longevity in Model OrganismsNuclear Structure and Function

Evolutionarily conserved and nonconserved cellular localizations and functions of human SIRT proteins

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Michishita, Eriko, Park, Jean Y., Burneskis, Jenna M., Barrett, J. Carl, Horikawa, Izumi·2005·Molecular Biology of the Cell

Abstract

Sir2 is a NAD + -dependent protein deacetylase that extends lifespan in yeast and worms. This study examines seven human proteins homologous to Sir2 (SIRT1 through SIRT7) for cellular localization, expression profiles, protein deacetylation activity, and effects on human cell lifespan. We found that: 1) three nuclear SIRT proteins (SIRT1, SIRT6, and SIRT7) show different subnuclear localizations: SIRT6 and SIRT7 are associated with heterochromatic regions and nucleoli, respectively, where yeast Sir2 functions; 2) SIRT3, SIRT4, and SIRT5 are localized in mitochondria, an organelle that links aging and energy metabolism; 3) cellular p53 is a major in vivo substrate of SIRT1 deacetylase, but not the other six SIRT proteins; 4) SIRT1, but not the other two nuclear SIRT proteins, shows an in vitro deacetylase activity on histone H4 and p53 peptides; and 5) overexpression of any one of the seven SIRT proteins does not extend cellular replicative lifespan in normal human fibroblasts or prostate epithelial cells. This study supports the notion that multiple human SIRT proteins have evolutionarily conserved and nonconserved functions at different cellular locations and reveals that the lifespan of normal human cells, in contrast to that of lower eukaryotes, cannot be manipulated by increased expression of a single SIRT protein.

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Authors
Michishita, E., Park, J. Y., Burneskis, J. M., Barrett, J. C., & Horikawa, I.
Affiliations
National Institutes of Health (US)
Venue
Molecular Biology of the Cell
Published
2005-10
Volume
16
Issue
10
Pages
4623-4635
ISSN
  • 1059-1524 (ISSN-L)
  • 1939-4586
OpenAlex
W2106715610
Cited by
1,364
References
50
Citations by year
2026: 23 · 2025: 47 · 2024: 59 · 2023: 59 · 2022: 85 · 2021: 87 · 2020: 82 · 2019: 61 · 2018: 77 · 2017: 77 · 2016: 73 · 2015: 75 · 2014: 70 · 2013: 86 · 2012: 72
FWCI
22.19
Type
journal article
Language
en
Open access
Locations
  • Molecular Biology of the Cell (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health
  • Japan Society for the Promotion of Science
Topics
  • Health Sciences › Medicine › Geriatrics and Gerontology › Sirtuins and Resveratrol in Medicine
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Aging › Genetics, Aging, and Longevity in Model Organisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nuclear Structure and Function
Keywords
SIRT1, SIRT6, SIRT7, SIRT3, SIRT4, SIRT5, NAD+-dependent deacetylase, subcellular localization, subnuclear localization, heterochromatin, nucleolus, mitochondria, p53 deacetylation, histone H4 deacetylation, replicative lifespan, evolutionary conservation, prostate epithelial cells, fibroblasts
MeSH terms
Cell Line, Cell Nucleolus, Fibroblasts, Heterochromatin, Histones, Humans, Mitochondria, Organ Specificity, Recombinant Fusion Proteins, Substrate Specificity, Tumor Suppressor Protein p53, Cellular Senescence, Sirtuins, Green Fluorescent Proteins

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