Aug, 2019
Structural basis for energy harvesting and dissipation in a diatom PSII-FCPII supercomplex
NATURE PLANTS
- Volume
- 5
- Number
- 8
- First page
- 890
- Last page
- 901
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.1038/s41477-019-0477-x
- Publisher
- NATURE PUBLISHING GROUP
Light-harvesting antenna systems in photosynthetic organisms harvest solar energy and transfer it to the photosynthetic reaction centres to initiate charge-separation and electron-transfer reactions. Diatoms are one of the important groups of oxyphototrophs and possess fucoxanthin chlorophyll a/c-binding proteins (FCPs) as light harvesters. The organization and association pattern of FCP with the photosystem II (PSII) core are unknown. Here we solved the structure of PSII-FCPII supercomplexes isolated from a diatom, Chaetoceros gracilis, by single-particle cryoelectron microscopy. The PSII-FCPII forms a homodimer. In each monomer, two FCP homotetramers and three FCP monomers are associated with one PSII core. The structure reveals a highly complicated protein-pigment network that is different from the green-type light-harvesting apparatus. Comparing these two systems allows the identification of energy transfer and quenching pathways. These findings provide structural insights into not only excitation-energy transfer mechanisms in the diatom PSII-FCPII, but also changes of light harvesters between the red-and green-lineage oxyphototrophs during evolution.
- Link information
- ID information
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- DOI : 10.1038/s41477-019-0477-x
- ISSN : 2055-026X
- eISSN : 2055-0278
- Pubmed ID : 31358960
- Web of Science ID : WOS:000480387700019