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The Sir2 family of proteins consists of broadly conserved NAD + -dependent deacetylases that are implicated in diverse biological processes, including DNA regulation, metabolism, and longevity. Sir2 proteins are regulated in part by the cellular concentrations of a noncompetitive inhibitor, nicotinamide, that reacts with a Sir2 reaction intermediate via a base-exchange reaction to reform NAD...
The ability of p53 to induce apoptosis plays an important role in tumor suppression. Here, we describe a previously unknown posttranslational modification of the DNA-binding domain of p53. This modification, acetylation of lysine 120 (K120), occurs rapidly after DNA damage and is catalyzed by the MYST family acetyltransferases hMOF and TIP60. Mutation of K120 to arginine, as occurs in human cancer,...
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