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5-Amino-1MQ (5-amino-1-methylquinolinium) is a small-molecule inhibitor of nicotinamide N-methyltransferase (NNMT), an enzyme that methylates nicotinamide using S-adenosyl methionine (SAM)
Vegan diets, excessive alcohol use, certain medications, aging, and certain stomach diseases all raise the risk of vitamin B12 insufficiency
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NNMT catalyzes the transfer of a methyl group from S-adenosylmethionine (SAM, the universal methyl donor in cells) to nicotinamide (a form of vitamin B3 and a precursor for NAD+ synthesis), producing 1-methylnicotinamide and S-adenosylhomocysteine (SAH)