9KQB
PSII-FCPII supercomplex from haptophyte Chrysotila roscoffensis
Summary for 9KQB
| Entry DOI | 10.2210/pdb9kqb/pdb |
| EMDB information | 62499 |
| Descriptor | Fucoxanthin chlorophyll a/c binding protein II (FCPII-1), Photosystem II reaction center protein L, Photosystem II reaction center protein M (psbM), ... (36 entities in total) |
| Functional Keywords | photosystem ii, photosynthesis, chlorophyll, light-harvesting complex, energy transfer, lhcii, fcpii, coccolithophore, haptophyte |
| Biological source | Chrysotila roscoffensis More |
| Total number of polymer chains | 42 |
| Total formula weight | 977752.36 |
| Authors | La Rocca, R.,Kato, K.,Tsai, P.-C.,Nakajima, Y.,Akita, F.,Shen, J.-R. (deposition date: 2024-11-25, release date: 2025-05-07, Last modification date: 2025-05-21) |
| Primary citation | La Rocca, R.,Kato, K.,Tsai, P.C.,Nakajima, Y.,Akita, F.,Shen, J.R. Structure of a photosystem II-FCPII supercomplex from a haptophyte reveals a distinct antenna organization. Nat Commun, 16:4175-4175, 2025 Cited by PubMed Abstract: Haptophytes are unicellular algae that produce 30 to 50% of biomass in oceans. Among haptophytes, a subset named coccolithophores is characterized by calcified scales. Despite the importance of coccolithophores in global carbon fixation and CaCO production, their energy conversion system is still poorly known. Here we report a cryo-electron microscopic structure of photosystem II (PSII)-fucoxanthin chlorophyll c-binding protein (FCPII) supercomplex from Chyrostila roscoffensis, a representative of coccolithophores. This complex has two sets of six dimeric and monomeric FCPIIs, with distinct orientations. Interfaces of both FCPII/FCPII and FCPII/core differ from previously reported. We also determine the sequence of Psb36, a subunit previously found in diatoms and red algae. The principal excitation energy transfer (EET) pathways involve mainly 5 FCPIIs, where one FCPII monomer mediates EET to CP47. Our findings provide a solid structural basis for EET and energy dissipation pathways occurring in coccolithophores. PubMed: 40325014DOI: 10.1038/s41467-025-59512-9 PDB entries with the same primary citation |
| Experimental method | ELECTRON MICROSCOPY (2.22 Å) |
Structure validation
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