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. 2019 Apr 19;180(3):1277–1290. doi: 10.1104/pp.19.00254

Figure 1.

Figure 1.

Structure of MbA and schematic structures of metabolites in MbA biosynthesis. A, The building blocks of MbA are labeled: myricetin, rhamnose (Rha), glucose (Glc), xylose (Xyl), and caffeic acid. The dotted line marks the mini-MbA structure. Red hydroxyls mark groups specific to myricetin compared with kaempferol, and the blue hydroxyl marks the group specific to the caffeoyl compared with a coumaroyl moiety. B, Schematic of myricetin 3-O-α-l-rhamnoside (MR), myricetin 3-O-β-d-glucosyl 1,2-α-l-rhamnoside (MRG), myricetin 3-O-(6′-O-caffeoyl)-β-d-glucosyl 1,2-α-l-rhamnoside (mini-MbA), and MbA. Identified MbA biosynthesis steps and enzymes are labeled. C, Caffeic acid (blue); G, Glc (green); M, myricetin (pink); R, Rha (yellow); X, Xyl (orange).