A phylogenetically conserved NAD+-dependent protein deacetylase activity in the Sir2 protein family

Jeffrey S. Smith, Carrie Baker Brachmann, Ivana Celic, Margaret A. Kenna, Shabazz Muhammad, Vincent J. Starai, Jose L. Avalos, Jorge C. Escalante-Semerena, Charles Grubmeyer, Cynthia Wolberger, Jef D. Boeke

Research output: Contribution to journalArticlepeer-review


The yeast Sir2 protein, required for transcriptional silencing, has an NAD+-dependent histone deacetylase (HDA) activity. Yeast extracts contain a NAD+-dependent HDA activity that is eliminated in a yeast strain from which SIR2 and its four homologs have been deleted. This HDA activity is also displayed by purified yeast Sir2p and homologous Archaeal, eubacterial, and human proteins, and depends completely on NAD+ in all species tested. The yeast NPT1 gene, encoding an important NAD+ synthesis enzyme, is required for rDNA and telomeric silencing and contributes to silencing of the HM loci. Null mutants in this gene have significantly reduced intracellular NAD+ concentrations and have phenotypes similar to sir2 null mutants. Surprisingly, yeast from which all five SIR2 homologs have been deleted have relatively normal bulk histone acetylation levels. The evolutionary conservation of this regulated activity suggests that the Sir2 protein family represents a set of effector proteins in an evolutionarily conserved signal transduction pathway that monitors cellular energy and redox states.

Original languageEnglish (US)
Pages (from-to)6658-6663
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number12
StatePublished - Jun 6 2000

ASJC Scopus subject areas

  • General


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