Figure 1. The Pcb–photosystem I (Pcb–PS
I) supercomplex of Prochlorococcus. a, Projection of
the top view of the Pcb–PS I supercomplex isolated from
Prochlorococcus marinus, strain SS120. This map
is derived from the initial analyses of 3,500 negatively stained
particles viewed under electron microscopy at room temperature
(scale bar, 5 nm). b, c, Top view from the stromal side (b),
and side view showing the extrinsic domains on
the stromal side (c) of a three-dimensional model of the Pcb–PS
I supercomplex; the model is based on X-ray data from cyanobacterial
PS I trimers10 (green) and CP43 transmembrane helices of cyanobacterial
photosystem II (ref. 8; red).
