Fig. 6: The PSII core.

a Superposition of the PSII core from RsPSII-CAC structure with the red algal PSII core structure (PDB code: 7Y5E), viewed from the membrane plane. PSII core from RsPSII-CAC is shown in surface mode, subunits that are present in red algal PSII but lack in our PSII core (PsbO/PsbU/PsbV/PsbQ’/Psb31/PsbJ/PsbY) are shown in ribbon mode and labeled. b Superposition of the residues coordinating Mn₄CaO₅ cluster in RsPSII-CAC structure (shown in slate and sea green) and in native cyanobacterial PSII structure (PDB code: 3WU2, shown in gray). c Superposition of the PSII core from RsPSII-CAC structure (cyan) with red algal PSII (PDB code: 7Y5E, pink), viewed from the stromal side. Subunits that are different between the two structures are labeled. d Superposition of PsbE/PsbF and the heme molecule in RsPSII-CAC structure (shown in cyan) and in native PSII structure (PDB code: 3WU2, shown in gray), the distances of His-Fe bonds are labeled. e Density of the two ions and adjacent residues.