Reactions Catalyzed
In the tryptophan metabolism pathway, N- Acetylserotonin O-methyltransferase catalyzes two separate reactions. The first reaction shown (Figure 2) is the reaction of N-acetyl-serotonin to N-acetyl-5-methoxy-tryptamine. S-adenosyl-L-methionine is used as a substrate and is converted to S-adenosyl-L-homocysteine. Figure 2: Reaction catalyzed by N- Acetylserotonin O-methyltransferase
Figure 3 is the same reaction as above, but the figure provides a clearer picture of how the reactant proceeds to product using N-Acetylserotonin O-methyltransferase in addition to the substrate.
Figure 3: Role of N- Acetylserotonin O-methyltransferase
The second reaction (Figure 4) catalyzed by N-Acetylserotonin O-methyltransferase in the tryptophan metabolism pathway is: S-Adenosyl-L-methionine + 5-Hydroxyindoleacetate ↔ S-Adenosyl-L-homocysteine + 5-Methoxyindoleacetate.
Figure 4: Second reaction catalyzed by N- Acetylserotonin O-methyltransferase
Figure 5 is a more general scheme of the reaction pathway from serotonin to melatonin. The number 2.1.1.4 refers to the Enzyme Commission Number (EC Number) for N- Acetylserotonin O-methyltransferase. These two steps are embedded in the highly involved tryptophan metabolism pathway.
Figure 5: Pathway serotonin → melatonin
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