The coenzyme NAD is a key electron carrier in redox reactions
In Chapter 6, we described the role of coenzymes, small molecules that assist in enzyme-catalyzed reactions. ADP acts as a coenzyme when it picks up energy released in an exergonic reaction and uses it to make ATP (an endergonic reaction). In a similar fashion, the coenzyme NAD (nicotinamide adenine dinucleotide) acts as an energy carrier, in this case in redox reactions (Figure 7.3).
NAD exists in two chemically distinct forms, one oxidized (NAD+) and the other reduced (NADH + H+) (Figure 7.4). Both forms participate in biological redox reactions. The reduction reaction
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