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SIRT4: Eukaryotic and prokaryotic group (class2) which includes human sirtuin SIRT4 and several bacterial homologs; 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, metabolic enzymes, and life span.