Reaction catalyzed by tryptophan 6-halogenase (1.14.19.59)
+
chloride
+
+
=
+
FAD
+
2
H2O
3-indolepropionic acid
+
chloride
+
O2
+
H+
=
6-chloro-3-indolepropionic acid
+
FAD
+
2 H2O