Reaction catalyzed by 4-dimethylallyltryptophan synthase (2.5.1.34), 7-dimethylallyltryptophan synthase (2.5.1.80)
+
=
+
methylallyl diphosphate
+
L-tryptophan
=
diphosphate
+
4-(but-2-enyl)-L-tryptophan