Figure 5: Secondary structures and topology diagrams of PhaE and PhaC proteins in Synechocystis sp. salina PCC6909. Data are represented as predicted by PDBsum tool. A,B. “Wiring diagrams” of the PhaE and PhaC secondary structures, showing α-helices and β-sheets plus additional motifs as β- and γ-turns and the corresponding amino acid strings. In panel A, PhaE does not show β-strands otherwise PhaC exhibits seven β-strands (indicated by arrows) belonging to the same β-sheet (pointed out as red “A”). Helices are counted and indicated (H1-H20 for PhaE; H1-H15 for PhaC). C,D. Topology diagrams of PhaE (panel C) and PhaC (panel D) proteins. They represent how the structural elements building the secondary structure (β-sheets and α-helices) are organized within the space and how these elements are linked to each other. Red cylinders represent the α-helices location. Each large arrow indicates a single β-strand, forming a β-sheet in PhaC. The N- to C-terminal orientation of the protein is indicated by thin arrows.