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2. Tryptophan - Wikipedia

   en.wikipedia.org/wiki/Tryptophan

   Tryptophan (symbol Trp or W) [3] is an α-amino acid that is used in the biosynthesis of proteins.Tryptophan contains an α-amino group, an α-carboxylic acid group, and a side chain indole, making it a polar molecule with a non-polar aromatic beta carbon substituent.

3. Harmine - Wikipedia

   en.wikipedia.org/wiki/Harmine

   The coincident occurrence of β-carboline alkaloids and serotonin in Peganum harmala indicates the presence of two very similar, interrelated biosynthetic pathways, which makes it difficult to definitively identify whether free tryptamine or L-tryptophan is the precursor in the biosynthesis of harmine. [7]

4. Tryptophanase - Wikipedia

   en.wikipedia.org/wiki/Tryptophanase

   The systematic name of this enzyme class is L-tryptophan indole-lyase (deaminating; pyruvate-forming). Other names in common use include L-tryptophanase, and L-tryptophan indole-lyase (deaminating). This enzyme participates in tryptophan metabolism and nitrogen metabolism. It has 2 cofactors: pyridoxal phosphate, and potassium. [1] [2] [3]

5. Monoamine precursor - Wikipedia

   en.wikipedia.org/wiki/Monoamine_precursor

   L-Tryptophan, a precursor of serotonin and melatonin and an example of a monoamine precursor.. Monoamine precursors are precursors of monoamines and monoamine neurotransmitters in the body.

6. Aromatic amino acid - Wikipedia

   en.wikipedia.org/wiki/Aromatic_amino_acid

   Tryptophan is the precursor to 5-hydroxytryptophan and then serotonin, tryptamine, auxin, kynurenines, and melatonin. [6] Tyrosine is the precursor to L-DOPA, dopamine, norepinephrine (noradrenaline), epinephrine (adrenaline), and the thyroid hormone thyroxine. It is also precursor to octopamine and melanin in numerous organisms. [6]

7. Proteinogenic amino acid - Wikipedia

   en.wikipedia.org/wiki/Proteinogenic_amino_acid

   Essential for humans, phenylalanine, tyrosine, and tryptophan contain a large, rigid aromatic group on the side chain. These are the biggest amino acids. These are the biggest amino acids. Like isoleucine, leucine, and valine, these are hydrophobic and tend to orient towards the interior of the folded protein molecule.