Target intelligence / Profile preview

Tryptophan Hydroxylase (None)

Target: None
Molecular classification: Enzyme, Aromatic amino acid hydroxylase

Overview

Tryptophan hydroxylase (TPH) is an enzyme that catalyzes the rate-limiting step in the biosynthesis of serotonin and melatonin. There are two main isoforms in humans: TPH1, primarily expressed in peripheral tissues, and TPH2, mainly found in serotonergic neurons of the brainstem raphe nuclei. TPH catalyzes the monooxygenation of tryptophan to produce 5-hydroxytryptophan, using tetrahydrobiopterin (BH₄) and molecular oxygen as cofactors. Alterations or inhibition of TPH can significantly affect serotonin levels.

Mechanism of action

Modulation of Tryptophan Hydroxylase activity affects serotonin levels, influencing neuronal signaling and mood regulation.

Biological functions

Serotonin biosynthesisMelatonin biosynthesisNeurotransmitter synthesisRegulation of mood

Disease associations

Mood disordersDepressionNeuropsychiatric disorders

Safety considerations

Potential for mood alterationsInteractions with serotonergic medications

Biomarkers

Tryptophan levels5-HTP levelsSerotonin levels

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