Can convert indole-3-acetonitrile to the plant hormone indole-3-acetic acid. a nitrile + 2 H2O = a carboxylate + NH4(+) Interacts with DEK3. Expressed in cotyledons, hypocotyls, leaves, roots, stems, flowers and siliques. Expressed throughout development, but at a very low level during the fruiting stage. Produced by alternative initiation at Met-7 of isoform 1. Belongs to the carbon-nitrogen hydrolase superfamily. Nitrilase family.