Figure 2: Comparison of the known structures of PMEs. (A) Overlay of the Cα trace of PME from tomato (green) and PME from carrot (orange). Structures are almost completely superimposable. (B) Superimposition of PME from tomato (green) and PME from E. chrysanthemi (violet). Although the β-helices are completely superimposable, main differences (showed by arrow) are located in the length of the turns protruding out from the β-helix in proximity of the putative active site cleft.