1st product of tryptophan catabolism is
Tryptophan is an aromatic essential amino acid The major metabolic fate of tryptophan is to be oxidized by tryptophan pyrrolase (tryptophan di-oxygenase) It is a hemoprotein. The enzyme is inducible by coicosteroids. <img src=" /> in tryptophan catabolism the first product is 3-hydroxykynurenine ref Satyanarayana 4th ed page 145
kynurenine
Bradykinin
PAF
Xantheurenate
vitamins