doi: 10.1007/978-1-4615-4709-9_81.
Latest on enzymology of serotonin biosynthesis in walnut seeds
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- PMID: 10721112
- DOI: 10.1007/978-1-4615-4709-9_81
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Latest on enzymology of serotonin biosynthesis in walnut seeds
Adv Exp Med Biol.
1999.
Abstract
Serotonin (5-HT) accumulation in walnut cotyledons is seen as a detoxification mechanism protecting the sensitive plant tissues of seeds from highly toxic ammonia concentrations following seed desiccation. Different metabolic pathways and cell compartments are involved in biosynthesis and storage of 5-HT. Ammonia fixation and incorporation into the indole moiety of tryptophan is followed by 5-HT biosynthesis via tryptamine in a two-step pathway with the adaptive tryptophan decarboxylase and the constitutive tryptamine 5-hydroxylase. Evidence is provided that tryptamine 5-hydroxylase is a member of the cytochrome P450 family which is involved in lipid hydroxylation processes in the very early period of seed development.
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