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Nicotinamide (INN, BAN UK [2]) or niacinamide (USAN US) is a form of vitamin B 3 found in food and used as a dietary supplement and medication. [ 3 ] [ 4 ] [ 5 ] As a supplement, it is used orally (swallowed by mouth) to prevent and treat pellagra (niacin deficiency). [ 4 ]
Nicotinamide adenine dinucleotide consists of two nucleosides joined by pyrophosphate. The nucleosides each contain a ribose ring, one with adenine attached to the first carbon atom (the 1' position) (adenosine diphosphate ribose) and the other with nicotinamide at this position. [4] [5] The redox reactions of nicotinamide adenine dinucleotide
Example of a label showing the amount of niacin (Vitamin B3), and specifying to be niacinamide in the ingredient section.. The United States adopted in 1942 the terms niacin to nicotinic acid and niacinamide to nicotinamide to avoid references to nicotine, [12] [13] the terms were incorporated into the United States Adopted Name [14] that was created later in 1961.
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Nicotinamide mononucleotide ("NMN" and "β-NMN") is a nucleotide derived from ribose, nicotinamide, nicotinamide riboside and niacin. [1] In humans, several enzymes use NMN to generate nicotinamide adenine dinucleotide (NADH). [ 1 ]
A nucleotide is an organic molecule consisting of a nitrogenous heterocyclic nucleobase (a purine or a pyrimidine), a pentose sugar (deoxyribose in DNA or ribose in RNA), and a phosphate or polyphosphate group.
In enzymology, a NMN nucleosidase (EC 3.2.2.14) is an enzyme that catalyzes the chemical reaction. nicotinamide D-ribonucleotide + H 2 O D-ribose 5-phosphate + nicotinamide. Thus, the two substrates of this enzyme are nicotinamide D-ribonucleotide and H 2 O, whereas its two products are D-ribose 5-phosphate and nicotinamide.
Nicotinamide N-methyltransferase (NNMT) is an enzyme that in humans is encoded by the NNMT gene. [5] NNMT catalyzes the methylation of nicotinamide and similar compounds using the methyl donor S-adenosyl methionine (SAM-e) to produce S-adenosyl-L-homocysteine (SAH) and 1-methylnicotinamide .