6J40
Structure of C2S2M2-type PSII-FCPII supercomplex from diatom
This is a non-PDB format compatible entry.
Summary for 6J40
| Entry DOI | 10.2210/pdb6j40/pdb |
| Related | 6J3Y 6J3Z |
| EMDB information | 9777 |
| Descriptor | Photosystem II reaction center protein D1, Photosystem II reaction center protein K, Photosystem II reaction center protein L, ... (42 entities in total) |
| Functional Keywords | photosystem, electron transport |
| Biological source | Chaetoceros gracilis More |
| Total number of polymer chains | 70 |
| Total formula weight | 1510991.28 |
| Authors | Nagao, R.,Kato, K.,Shen, J.R.,Miyazaki, N.,Akita, F. (deposition date: 2019-01-07, release date: 2019-08-07, Last modification date: 2019-11-06) |
| Primary citation | Nagao, R.,Kato, K.,Suzuki, T.,Ifuku, K.,Uchiyama, I.,Kashino, Y.,Dohmae, N.,Akimoto, S.,Shen, J.R.,Miyazaki, N.,Akita, F. Structural basis for energy harvesting and dissipation in a diatom PSII-FCPII supercomplex. Nat.Plants, 5:890-901, 2019 Cited by PubMed Abstract: 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. PubMed: 31358960DOI: 10.1038/s41477-019-0477-x PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (3.8 Å) |
Structure validation
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