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2018 ; 9
(ä): 357
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Structure and Function of the Photosystem Supercomplexes
#MMPMID29616068
Gao J
; Wang H
; Yuan Q
; Feng Y
Front Plant Sci
2018[]; 9
(ä): 357
PMID29616068
show ga
Photosynthesis converts solar energy into chemical energy to sustain all life on
earth by providing oxygen and food, and controlling the atmospheric carbon
dioxide. During this process, the water-splitting and oxygen-evolving reaction is
catalyzed by photosystem II (PSII), while photosystem I (PSI) generates the
reducing power for the reduction of NADP(+) to NADPH. Together with their
peripheral light-harvesting complexes (LHCs), photosystems function as
multisubunit supercomplexes located in the thylakoid membranes of cyanobacteria,
algae, and plants. Recent advances in single-particle cryo-electron microscopy
(cryoEM), X-ray free electron laser (XFEL) and other techniques have revealed
unprecedented structural and catalytic details concerning the two supercomplexes.
Several high-resolution structures of the complexes from plants were solved, and
serial time-resolved crystallography and "radiation-damage-free" femtosecond XFEL
also provided important insights into the mechanism of water oxidation. Here, we
review these exciting advances in the studies of the photosystem supercomplexes
with an emphasis on PSII-LHCII, propose presently unresolved problems in this
field, and suggest potential tendencies for future studies.
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