Class of Enzyme and Function
N-Acetylserotonin O-methyltransferase can be classified under three types of enzyme functional groups: transferases, one-carbon group transferers, and methyltransferases.
It catalyzes two reactions in the tryptophan metabolism pathway, and both can be traced back to serotonin. Serotonin has many fates in this pathway, and N- Acetylserotonin O-methyltransferase catalyzes reactions in two of these fates. The enzyme has been studied most for its catalysis of the final step of the pathway from serotonin to melatonin, but it also catalyzes one of the reactions in the many step process of serotonin → 5-Methoxy-indolacetate. Figure 1 is a clear picture of where N- Acetylserotonin O-methyltransferase is used during tryptophan metabolism (see two locations of enzyme number 2.1.1.4).
Figure 1.
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