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Tryptophan metabolism

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Contents

Tryptophan follows three metabolic fates:


  1. Incorporation into proteins.

  2. Production of indoles.

  3. Breakdown into kynurenine.


Fiore & Murray 2021 Current Opinion Immunology 70: 7-14

Tryptophan is first deaminated to 3-indolepyruvate. It is then decarboxylated to indole acetaldehyde by indolepyruvate decarboxylase. This latter compound is transformed to tryptophol by alcohol dehydrogenase

Local tryptophan depletion through indoleamine pyrrole-2,3-dioxygenase (IDO)
Blankenstein et al. 2012

[IDO](brain://4pR9EoQgHUOoIsEafs9ZuQ/IdoIndolamine23…