8jze

PSI-AcpPCI supercomplex from Symbiodinium

spinqualitylabelsall models 8jze, resolution 2.99Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 8jze is a 10 chain structure with sequence from Symbiodinium. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.99Å Ligands: BCR, CLA, DD6, DGD, KC1, LHG, LMG, PID, PQN, SQD, UIX Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A812FX01_9DINO Publication Abstract from PubMed Marine photosynthetic dinoflagellates are a group of successful phytoplankton that can form red tides in the ocean and also symbiosis with corals. These features are closely related to the photosynthetic properties of dinoflagellates. We report here three structures of photosystem I (PSI)-chlorophylls (Chls) a/c-peridinin protein complex (PSI-AcpPCI) from two species of dinoflagellates by single-particle cryoelectron microscopy. The crucial PsaA/B subunits of a red tidal dinoflagellate Amphidinium carterae are remarkably smaller and hence losing over 20 pigment-binding sites, whereas its PsaD/F/I/J/L/M/R subunits are larger and coordinate some additional pigment sites compared to other eukaryotic photosynthetic organisms, which may compensate for the smaller PsaA/B subunits. Similar modifications are observed in a coral symbiotic dinoflagellate Symbiodinium species, where two additional core proteins and fewer AcpPCIs are identified in the PSI-AcpPCI supercomplex. The antenna proteins AcpPCIs in dinoflagellates developed some loops and pigment sites as a result to accommodate the changed PSI core, therefore the structures of PSI-AcpPCI supercomplex of dinoflagellates reveal an unusual protein assembly pattern. A huge pigment network comprising Chls a and c and various carotenoids is revealed from the structural analysis, which provides the basis for our deeper understanding of the energy transfer and dissipation within the PSI-AcpPCI supercomplex, as well as the evolution of photosynthetic organisms. Structures and organizations of PSI-AcpPCI supercomplexes from red tidal and coral symbiotic photosynthetic dinoflagellates.,Li X, Li Z, Wang F, Zhao S, Xu C, Mao Z, Duan J, Feng Y, Yang Y, Shen L, Wang G, Yang Y, Yu LJ, Sang M, Han G, Wang X, Kuang T, Shen JR, Wang W Proc Natl Acad Sci U S A. 2024 Feb 13;121(7):e2315476121. doi: , 10.1073/pnas.2315476121. Epub 2024 Feb 6. PMID:38319970 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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