Discuss the structure of a plant membrane protein supercomplex consisting of the PSI reaction center ...

ANSWER: A plant membrane protein supercomplex exists as a monomer composed of 17 distinct protein subunits and 193 prosthetic groups, including 173 chlorophylls, 2 phylloquinones, and 3 Fe4S4 clusters. The four LHC1 subunits form an arc around one side of the PSI reaction center. A second light-harvesting complex (LHC2) binds to another side. This plant PSI system, like all photosystems, is remarkably efficient, showing a quantum efficiency of nearly 1 (one electron transferred per photon falling anywhere within the supercomplex). The many Chl and other light-harvesting molecules of the supercomplex form an integrated network for highly efficient transfer of light energy into P700.

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