Fig. 1.

Biosynthetic pathways of prenylated isoflavonoids in soybean. Bold arrows show reactions catalyzed by the PTs that were characterized in this study. As the candidates of IDT1 and IDT2 products, 3′-dimethylallyldaidzein, 3′-dimethylallylgenistein and 8-dimethylallyldaidzein were identified in soybean (Cheng et al. 2011), but the genuine products of IDT1 and IDT2 were not determined. The other PT products have been reported. See text. Dashed arrows represent putative steps. C4DT, coumestrol 4-dimethylallyltransferase; G2DT, (−)-glycinol 2-dimethylallyltransferase; G4DT, (−)-glycinol 4-dimethylallyltransferase; IDT1, isoflavone dimethylallyltransferase 1; IDT2, isoflavone dimethylallyltransferase 2; IFS, 2-hydroxyisoflavanone synthase; HID, 2-hydroxyisoflavanone dehydratase; P6aH, pterocarpan 6a-hydroxylase.