Question 22.4: Coenzymes Describe the reactive part of each of the followin......

General, Organic, and Biological Chemistry: Structures of Life
Chemistry: An Introduction to General, Organic, and Biological Chemistry [1013382]
Chemistry an Introduction to General, Organic, and Biological Chemistry
Chemistry an Introduction to General, Organic, and Biological Chemistry
General, Organic, and Biological Chemistry Structures of Life [1002561]

Coenzymes

Describe the reactive part of each of the following coenzymes and the way each participates in metabolic pathways:

a. FAD b. NAD $^+$

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a. The oxidized form of FAD undergoes reduction when two nitrogen atoms in the flavin part react with $2 H ^{+}$ and $2\ e^{-}$ to give $FADH _2$ . The coenzyme FAD is utilized in oxidation reactions that produce carbon-carbon double bonds (C=C).

b. The oxidized form of $NAD ^{+}$ undergoes reduction when a carbon atom in the nicotinamide part reacts with $2 H ^{+}$ and $2\ e^{-}$ , to give NADH and $H ^{+}$ . The coenzyme $NAD ^{+}$ is utilized in oxidation reactions that produce carbon-oxygen double bonds (C=O).

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