Probable tryptophan aminotransferase involved in auxin (IAA) biosynthesis (PubMed:24654985, PubMed:29740464). Required for auxin production to initiate multiple change in growth in response to environmental and developmental cues (PubMed:24654985, PubMed:29740464). Functions upstream of YUCCA1 in auxin biosynthesis (PubMed:29740464). Required for polar auxin transport (PubMed:24654985). 2-oxoglutarate + L-tryptophan = indole-3-pyruvate + L-glutamate Plant hormone metabolism; auxin biosynthesis. Widely expressed. Expressed in developing grain from 1 to 21 days after pollination. Strong dwarf phenotype and pleiotropic developmental defects affecting all organs (PubMed:29740464). Reduced endogenous levels of auxin (PubMed:29740464). Belongs to the alliinase family.