Fig. 2. Structure of the FCPI.
a Overall structure of the PSI-FCPI with a view from the stromal side. The numbering 1–16 stands for Fcpa1–16 subunits, respectively. Orange-colored FCPI subunits indicate FCPI inner ring surrounding the PSI core, whereas purple-colored FCPI subunits represent peripheral FCPI attached to the outside of the FCPI ring. Red dotted line represents the interface between PSI and FCPI. b Structure of the apo-protein of Fcpa8. c Arrangement of the pigments (Chls and Cars) within Fcpa8, with the right-side panel rotated 90° clockwise relative to the left-side panel. Green and cyan stand for Chls a and c, respectively. Orange and red indicate Fx and Ddx, respectively. d Three dimeric Chl clusters in Fcpa8. Interactions are indicated by black dashed lines with distances labeled in Å. e Characteristic interactions of Cars with Chls within Fcpa8. Interactions are indicated by black dashed lines with distances labeled in Å.