Linking chromatin function with metabolic networks: Sir2 family of NAD(+)-dependent deacetylases.
Chromatin remodeling enzymes rely on coenzymes derived from metabolic pathways, suggesting a tight synchronization among apparently diverse cellular processes. A unique example of this link is the recently described NAD(+)-dependent protein and/or histone deacetylases. The founding member of this family - yeast silent information regulator 2 (ySir2) - is involved in gene silencing, chromosomal stability and ageing. Sir2-like enzymes catalyze a reaction in which the cleavage of NAD(+)and histone and/or protein deacetylation are coupled to the formation of O-acetyl-ADP-ribose, a novel metabolite. The dependence of the reaction on both NAD(+) and the generation of this potential second messenger offers new clues to understanding the function and regulation of nuclear, cytoplasmic and mitochondrial Sir2-like enzymes.
Denu
John M
JM
Department of Biochemistry and Molecular Biology, Oregon Health and Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97201, USA. denuj@ohsu.edu
D002384:Catalysis; D002843:Chromatin / Q000737:chemistry / Q000378:metabolism / Q000502:physiology*; D020868:Gene Silencing; D008958:Models, Molecular; D009243:NAD / Q000378:metabolism*; D011487:Protein Conformation; D037761:Sirtuins / Q000378:metabolism / Q000502:physiology*; D013379:Substrate Specificity
D002843:Chromatin; D009243:NAD; D037761:Sirtuins