Structural Model of the Arrangement of Complexes within a PSI-Only Thylakoid Membrane.
The PSI trimers are arranged according to the AFM topograph in Figure 1A, visible as an overlay on the right. The inset on the right shows the correspondence between the PsaC-D-E protrusions of each PSI trimer (red) and corresponding AFM topological features (white). The trimers are shown in surface representation. The pigments can be seen through the transparent surface on the left as the antenna (green) and RC (red) chlorophylls, represented as porphyrin rings, as well as the carotenoids (orange). The inset on the left shows the typical packing pattern around a trimer (see Figure 4). The model features a total of 96 PSI trimers and 27,648 chlorophylls.