title: Role of NAD(+) in the deacetylase activity of the SIR2-like proteins.
abstract: In this report we describe the role of NAD(+) in the deacetylation reaction catalyzed by the SIR2 family of enzymes. We first show that the products of the reaction detected by HPLC analysis are ADP-ribose, nicotinamide, and a deacetylated peptide substrate. These products are in a 1:1:1 molar ratio, indicating that deacetylation involves the hydrolysis of one NAD(+) to ADP-ribose and nicotinamide for each acetyl group removed. Three results suggest that deacetylation requires an enzyme-ADP-ribose intermediate. First, the enzyme can promote an NAD(+) if nicotinamide exchange reaction that depends on an acetylated substrate. Second, a non-hydrolyzable NAD(+) analog is a competitive inhibitor of the enzyme, and, third, nicotinamide shows product inhibition of deacetylase activity.
authors.affiliation: Department of Biochemistry and Cell Biology, State University of New York, Stony Brook, New York, 11794-5215, USA.
authors.forename: J
authors.initials: J
authors.lastname: Landry
authors.forename: J T
authors.initials: JT
authors.lastname: Slama
authors.forename: R
authors.initials: R
authors.lastname: Sternglanz
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000378:metabolism; D000595:Amino Acid Sequence; D002851:Chromatography, High Pressure Liquid; D006655:Histone Deacetylases / Q000378:metabolism*; D006657:Histones / Q000737:chemistry / Q000378:metabolism; D007700:Kinetics; D008969:Molecular Sequence Data; D009243:NAD / Q000378:metabolism*; D009536:Niacinamide / Q000378:metabolism; D010446:Peptide Fragments / Q000737:chemistry / Q000378:metabolism; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D056565:Sirtuin 2; D037761:Sirtuins; D013379:Substrate Specificity; D015534:Trans-Activators / Q000378:metabolism*
chemical_list: D006657:Histones; D010446:Peptide Fragments; D038281:Silent Information Regulator Proteins, Saccharomyces cerevisiae; D015534:Trans-Activators; D009243:NAD; D000246:Adenosine Diphosphate Ribose; D009536:Niacinamide; C087778:SIR2 protein, S cerevisiae; D056565:Sirtuin 2; D037761:Sirtuins; D006655:Histone Deacetylases