FIGURE 6.

Schematic presentation of conserved motifs in plant and bacterial terpene cyclases. Seven conserved sequence motifs are present in plant terpene synthases. Numbers indicate the amino acids where the motif approximately appears in the protein. Plant terpene synthases are ca. 520 amino acids long. Bacterial terpene synthases are ca. 360 amino acids long and present two conserved motifs and two conserved amino acids. The SOD_c20750 gene, annotated as terpene cyclase of Serratia plymuthica 4Rx13 exhibits the conserved DDXXXDE motif and the conserved R and RY amino acids of bacterial terpene cyclases.