Discoveries of nicotinamide riboside as a nutrient and conserved NRK genes establish a Preiss-Handler independent route to NAD+ in fungi and humans.

Abstract	NAD+ is essential for life in all organisms, both as a coenzyme for oxidoreductases and as a source of ADPribosyl groups used in various reactions, including those that retard aging in experimental systems. Nicotinic acid and nicotinamide were defined as the vitamin precursors of NAD+ in Elvehjem's classic discoveries of the 1930s. The accepted view of eukaryotic NAD+ biosynthesis, that all anabolism flows through nicotinic acid mononucleotide, was challenged experimentally and revealed that nicotinamide riboside is an unanticipated NAD+ precursor in yeast. Nicotinamide riboside kinases from yeast and humans essential for this pathway were identified and found to be highly specific for phosphorylation of nicotinamide riboside and the cancer drug tiazofurin. Nicotinamide riboside was discovered as a nutrient in milk, suggesting that nicotinamide riboside is a useful compound for elevation of NAD+ levels in humans.
Authors	Pawel Bieganowski, Charles Brenner
Journal	Cell (Cell) Vol. 117 Issue 4 Pg. 495-502 (May 14 2004) ISSN: 0092-8674 [Print] United States
PMID	15137942 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)
Chemical References	Intracellular Signaling Peptides and Proteins Nucleosides Pyridinium Compounds Saccharomyces cerevisiae Proteins nicotinamide-beta-riboside NAD 3-(1-deoxyribofuranosyl)benzamide Niacinamide Ribavirin NMRK2 protein, human NRK1 protein, S cerevisiae Phosphotransferases (Alcohol Group Acceptor) nicotinamide riboside kinase NMRK1 protein, human tiazofurin
Topics	Chromosomes, Human, Pair 9 (genetics) Energy Metabolism (genetics) Evolution, Molecular Fungi (enzymology, genetics) Gene Expression Regulation, Enzymologic (genetics) Gene Expression Regulation, Fungal (genetics) Humans Intracellular Signaling Peptides and Proteins Molecular Sequence Data NAD (biosynthesis) Niacinamide (analogs & derivatives, chemistry, metabolism) Nucleosides (chemistry) Phosphorylation Phosphotransferases (Alcohol Group Acceptor) (genetics, isolation & purification, metabolism) Pyridinium Compounds Ribavirin (analogs & derivatives, chemistry, pharmacology) Saccharomyces cerevisiae Proteins (genetics, isolation & purification, metabolism) Sequence Homology, Amino Acid Sequence Homology, Nucleic Acid

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