Fig. 1From: Combining protein and metabolic engineering strategies for biosynthesis of melatonin in Escherichia coliThe melatonin biosynthesis pathway. TPH, tryptophan hydroxylase; 5-HTP, 5-Hydroxytryptophan; TDC, tryptophan decarboxylase; SNAT, serotonin N-acetyltransferase; ASMT, N-acetylserotonin methyltransferase; COMT, caffeic acid O-methyltransferase; SAM, S-adenosylmethionine; SAH, S-adenosylhomocysteineBack to article page