The Sir2 family of protein deacetylases.

@article{Blander2004TheSF,
  title={The Sir2 family of protein deacetylases.},
  author={Gil Blander and Leonard P Guarente},
  journal={Annual review of biochemistry},
  year={2004},
  volume={73},
  pages={
          417-35
        }
}
The yeast SIR protein complex has been implicated in transcription silencing and suppression of recombination. The Sir complex represses transcription at telomeres, mating-type loci, and ribosomal DNA. Unlike SIR3 and SIR4, the SIR2 gene is highly conserved in organisms ranging from archaea to humans. Interestingly, Sir2 is active as an NAD+-dependent deacetylase, which is broadly conserved from bacteria to higher eukaryotes. In this review, we discuss the role of NAD+, the unusual products of… 

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