nicotinamide adenine dinucleotide

Ribosylnicotinamide 5′-phosphate (NMN) and adenosine 5′-phosphate (AMP) linked by phosphoanhydride linkage between the two phosphoric groups; binds as a coenzyme to proteins, serves in respiratory metabolism (hydrogen acceptor and donor) through alternate oxidation and reduction (NAD⁺ ⇋ NADH). See also entries under NAD⁺ and NADP⁺.

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nicotinamide adenine dinucleotide n NAD

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(NAD) a coenzyme composed of nicotinamide mononucleotide (NMN) coupled to adenosine monophosphate (AMP) by pyrophosphate linkage. It is found widely in nature and is involved in numerous enzymatic reactions in which it serves as an electron carrier by being alternately oxidized (NAD⁺) and reduced (NADH).