Dimethylallyltryptophan synthase; part of the DMATS1 gene cluster that mediates the biosynthesis of a reversely N-prenylated monomeric L-tryptophan (r-N-DMAT) (PubMed:28295904). The main product of the cluster is the r-N-DMAT produced by the dimethylallyltryptophan synthase DMATS1 and it remains unclear whether this metabolite undergoes further modifications when silent gene clusters are activated (PubMed:28295904). The acetylated form of r-N-DMAT, ac-r-N-DMAT, is also produced (PubMed:28295904). The roles of the cytochrome P450 monooxygenase FFUJ_09176 and the methyltransferase FFUJ_09178 have still to be elucidated (Probable). Expression is negaticely regulated by the global nitrogen regulator areA. Impairs the production of r-N-DMAT and ac-r-N-DMAT. Belongs to the tryptophan dimethylallyltransferase family.