SIRT1: Eukaryotic group (class1) which includes human sirtuins SIRT1-3 and yeast Hst1-4; and are members of the SIR2 family of proteins, silent information regulator 2 (Sir2) enzymes which catalyze NAD+-dependent protein/histone deacetylation. Sir2 proteins have been shown to regulate gene silencing, DNA repair, and life span. The most-studied function, gene silencing, involves the inactivation of chromosome domains containing key regulatory genes by packaging them into a specialized chromatin structure that is inaccessible to DNA-binding proteins. The nuclear SIRT1 has been shown to target the p53 tumor suppressor protein for deacetylation to suppress DNA damage, and the cytoplasmic SIRT2 homolog has been shown to target alpha-tubulin for deacetylation for the maintenance of cell integrity.
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