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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., EXTRAMURAL
RESEARCH SUPPORT, NON-U.S. GOV'T
Trichostatin A inhibits deacetylation of histone H3 and p53 by SIRT6.
Archives of Biochemistry and Biophysics 2018 January 16
SIRT6 is an epigenetic modification enzyme that regulates gene transcription through its deacetylase activity. In addition to histone protein, SIRT6 also modify other proteins and enzymes, some of which are central players in metabolic reprogramming and aging process. Therefore, SIRT6 has emerged as a therapeutic target for the treatment of metabolic disorder and age-related diseases. Here, we report that SIRT6 deacetylates lysine 382 of p53 in short synthetic peptide sequence and in full length p53. Further studies showed that the deacetylation of H3K9Ac and p53K382Ac are insensitive to nicotinamide inhibition, but are sensitive to trichostatin A (TSA) inhibition. Detailed kinetic analysis revealed that TSA competes with the peptide substrate for inhibition, and this inhibition is unique to SIRT6 in the sirtuin family. Taken together, this study not only suggests potential roles of SIRT6 in regulating apoptosis and stress resistance via direct deacetylation of p53, but also provides lead compound for the development of potent and selective SIRT6 inhibitors.
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