Figure 3.

The conserved plant secondary product glycosyltransferase (PSPG) motif in group O in all taxa analyzed, monocots and eudicots in comparison with group D represented by Brassicaceae family. Highly conserved amino acids are shown in boxes (Group O: 1: 5′-PQLEIL-3′, 2: 5′-FMSHCGWNS-3′ and 3: 5′-WPMHSDQ-3′; group D: 1: 5′-PQ-3′, 2: 5′-HCGWNS-3′ and 3: 5′-DQ-3′). Group O—cisZOG is characterized by 5′-HS-3′ in the position 41 and 42 of PSPG. Circles indicate the residues interacting directly with the UDP-sugar based on available crystal structures according to Ref.⁹.