ID 2.7.1.222 DE 4-hydroxytryptamine kinase. CA 4-hydroxytryptamine + ATP = 4-hydoxytryptamine 4-phosphate + ADP + H(+). CC -!- Also acts on 4-hydroxy-L-tryptophan in vitro. CC -!- Isolated from the fungus Psilocybe cubensis. CC -!- Involved in the biosynthesis of the psychoactive compound psilocybin. DR P0DPA8, PSIK_PSICU ; A0A286LEZ6, PSIK_PSICY ; //