an enzyme which catalyzes the initial step in the biosynthesis of serotonin. It utilizes tetrahydrobiopterin as a component enzyme to modify the dietary amino acid i-tryptophan to 5-hydroxytryptophan. This response is the rate-restricting step in serotonin synthesis, inhibited by amounts of tryptophan within the brain in addition to by amount of activity of neurons which utilize serotonin as a neurotransmitter.
TRYPTOPHAN HYDROXYLASE: “Tryptophan hydroxylase levels are far below what the physician would like.”
Cite this article
mohammad looti (2025). TRYPTOPHAN HYDROXYLASE. PSYCHOLOGICAL SCALES. Retrieved from https://scales.arabpsychology.com/trm/tryptophan-hydroxylase/
mohammad looti. "TRYPTOPHAN HYDROXYLASE." PSYCHOLOGICAL SCALES, 19 Oct. 2025, https://scales.arabpsychology.com/trm/tryptophan-hydroxylase/.
mohammad looti. "TRYPTOPHAN HYDROXYLASE." PSYCHOLOGICAL SCALES, 2025. https://scales.arabpsychology.com/trm/tryptophan-hydroxylase/.
mohammad looti (2025) 'TRYPTOPHAN HYDROXYLASE', PSYCHOLOGICAL SCALES. Available at: https://scales.arabpsychology.com/trm/tryptophan-hydroxylase/.
[1] mohammad looti, "TRYPTOPHAN HYDROXYLASE," PSYCHOLOGICAL SCALES, vol. X, no. Y, ص Z-Z, October, 2025.
mohammad looti. TRYPTOPHAN HYDROXYLASE. PSYCHOLOGICAL SCALES. 2025;vol(issue):pages.