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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 .
1-Methylnicotinamide is an endogenic substance that is produced in the liver when Nicotinamide is metabolized. It is a typical substance secreted in the kidney. It participates in the nicotinamide salvage pathway within the NAD + (nicotinamide adenine dinucleotide) metabolic pathway, thereby contributing to optimizing NAD + levels. [2]
In enzymology, a nicotinamide N-methyltransferase (NNMT) (EC 2.1.1.1) is an enzyme that catalyzes the chemical reaction S-adenosyl-L-methionine + nicotinamide ⇌ {\displaystyle \rightleftharpoons } S-adenosyl-L-homocysteine + 1-methylnicotinamide.
Independently of clinical symptoms, blood level of tryptophan or urinary metabolites such as 2-pyridone/N-methylnicotinamide ratio <2 or NAD/NADP ratio in red blood cells can diagnose pellagra. The diagnosis is confirmed by rapid improvements in symptoms after doses of nicotinamide (250–500 mg/day) or nicotinamide enriched food.
Nicotinamide cream is used as a treatment for acne. [5] It has anti-inflammatory actions, which may benefit people with inflammatory skin conditions. [18]Nicotinamide increases the biosynthesis of ceramides in human keratinocytes in vitro and improves the epidermal permeability barrier in vivo. [19]
Excess nicotinic acid is methylated in the liver to N 1-methylnicotinamide (NMN) and excreted in urine as such or as the oxidized metabolites N 1-methyl-2-pyridone-5-carboxamide and N1-Methyl-4-pyridone-3-carboxamide (2PY and 4PY). Decreased urinary content of these metabolites is a measure of niacin deficiency. [20]
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Methylnicotinamide may refer to: 1-Methylnicotinamide (trigonellamide) N-Methylnicotinamide (nicotinyl methylamide) This page was last edited on 3 November ...