TryptophanIndolesTryptophan OxygenaseTryptophan SynthaseIndole AlkaloidsTryptophan HydroxylaseModels, MolecularKynurenineMolecular Sequence DataProtein ConformationAmino Acid SequenceBinding SitesSpectrometry, FluorescenceKineticsBromosuccinimideTryptophanaseMolecular StructureAmino AcidsMagnetic Resonance SpectroscopyIndoleamine-Pyrrole 2,3,-DioxygenasePolymerase Chain ReactionSecologanin Tryptamine AlkaloidsCrystallography, X-RayStructure-Activity RelationshipEscherichia coliortho-AminobenzoatesProtein Structure, SecondaryProtein BindingSkatoleMutation