Synthesis and catabolism of dopamine and serotonin

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Synthesis and catabolism of dopamine and serotonin Synthesis and catabolism of dopamine and serotonin. Dopamine and serotonin are formed from the amino acids tyrosine and tryptophan, respectively. Their synthesis also requires two cofactors. BH4 (tetrahydrobiopterin) is formed in a three-step pathway from GTP and is the cofactor for tyrosine hydroxylase and tryptophan hydroxylase. It is also required for the activity of PAH. The second cofactor is pyridoxal 5′-phosphate (B6), which is required for AADC activity. Following release of dopamine and serotonin, they are rapidly metabolized to form HVA and 5HIAA, respectively; these metabolites are measured in spinal fluid and provide an indication of the overall turnover of these neurotransmitters. GTPCH, GTP cyclohydrolase; 6PTPS, 6-pyruvoyltetrahydropterin synthase; SR, sepiapterin reductase; PCD, pterin a-carbinolamine dehydratase; DHPR, dihydropteridine reductase, NH2TP: dihydroneopterin triphosphate; 6PTP, 6-pyruvoyltetrahydropterin; qBH2, quinonoid dihydrobiopterin; 7,8-BH2, 7,8-dihydrobiopterin; Phe, phenylalanine; Tyr, tyrosine; Tryp, tryptophan; PAH, phenylalanine hydroxylase; TH, tyrosine hydroxylase; TRYPH, tryptophan hydroxylase; 5HTP, 5-hydroxytryptophan; B6, pyridoxal 5′-phosphate. (Reproduced with permission from Hyland K. Inherited disorders affecting dopamine and serotonin: Critical neurotransmitters derived from aromatic amino acids. J Nutr 2007;137:1568S-1572S.) Source: Chapter 28. Genetic Forms of Dystonia, Movement Disorders, 3e Citation: Watts RL, Standaert DG, Obeso JA. Movement Disorders, 3e; 2012 Available at: http://neurology.mhmedical.com/DownloadImage.aspx?image=/data/Books/watt/watt_c028f001.gif&sec=40659767&BookID=477&ChapterSecID=40656100&imagename= Accessed: November 14, 2017 Copyright © 2017 McGraw-Hill Education. All rights reserved