NADH's role in cellular respiration takes place with the electron transport chain. NADH is the junction of nicotinamide adenine dinucleotide (NAD+) and hydrogen. Thus, it is the reduced form of
Nicotinamide adenine dinucleotide (NAD) and its relative nicotinamide adenine dinucleotide phosphate (NADP) are two of the most important coenzymes in the cell. NADP is simply NAD with a third phosphate group attached as shown at the bottom of the figure.
Nicotinamide adenine dinucleotide (NAD+) is an essential coenzyme involved in several redox reactions. NAD + also serves as an important substrate for several enzymes associated with DNA repair, secondary messenger signaling, and transcriptional regulation.
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