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An enzyme complex was isolated from  Arabidopsis thaliana  that catalyzes the entire pathway of biosynthesis of the major plant growth hormone, indole-3-acetic acid (IAA), from ( S )-tryptophan. The 160–180 kDa, soluble complex catalyzes a strictly O 2 -dependent reaction which requires no further added factors and is stereospecific for the substrate ( S )-tryptophan (app.  K m   = 120μM).  H 2  18 O labeling proved that both oxygen atoms of IAA were delivered  via  H 2 O. This, as well as immunological evidence for the presence of a nitrilase-like protein in the complex, suggests the reaction to proceed  via  the  intermediate indole-3-acetonitrile. IAA-synthase forms a tight metabolite channel committed to IAA production and occurs in shoots, roots and cell cultures of  A. thaliana.

IAA-Synthase, an Enzyme Complex from Arabidopsis thaliana Catalyzing the Formation of Indole-3-Acetic Acid from (S)-Tryptophan