“…Additional modifications applied in L-TRP overproducers include the overexpression of exporter protein YddG [61,78,79], the inactivation of permeases AroP, Mtr and TnaB to avoid re-internalization [61,79,80], the deletion of gene tnaA coding for a tryptophanase to avoid product degradation [59,81,82] and expression of genes included in the tryptophan biosynthetic branch, including a feedback-resistant version of anthranilate synthase, TrpE fbr [60,81]. Variations on the strategies described in this section have also been applied to the production of other valuable compounds derived from the AAA pathway such as phenyllactate, phenylacetate and phenylethanol [83], L-DOPA [84], mandelic acid [85], deoxyviolacein and violacein [82,86], avenanthramides [87], and resveratrol [88] (Table 2).…”