Deamination of nicotinamide to nicotinate Condensation of nicotinamide to nicotinamide D-ribonucleotide (NMN) A phosphoribosyl group is added to nicotinate to form nicotinate mononucleotide (NaMN) PathwayStep2371 PathwayStep2372 PathwayStep2373 Nicotinamide salvaging GENE ONTOLOGYGO:0006769 Nicotinamide levels are modulated by the action of three enzymes involved in nicotinamide salvaging. They are nicotinamide deaminase, nicotinamide phosphoribosyltransferase and nicotinate phosphoribosyltransferase. These enzymes are poorly characterized in humans, depsite their importance in nicotinamide utilization. Pubmed14704851 Reactome Database ID Release 43197264 Reactome, http://www.reactome.org ReactomeREACT_11213