7yca | pdb_00007yca

Cryo-EM structure of the PSI-LHCI-Lhcp supercomplex from Ostreococcus tauri

spinqualitylabelsall models 7yca, resolution 2.94Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7yca is a 10 chain structure with sequence from Ostreococcus tauri. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: ACE, BCR, CHL, CL0, CLA, DGD, IWJ, KC2, LHG, LMG, NEX, PQN, Q6L, SF4, SQD, TPO, XAT Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q3B9U3_OSTTA The light-harvesting complex (LHC) functions as a light receptor, it captures and delivers excitation energy to photosystems with which it is closely associated.[RuleBase:RU363080] Publication Abstract from PubMed As a ubiquitous picophytoplankton in the ocean and an early-branching green alga, Ostreococcus tauri is a model prasinophyte species for studying the functional evolution of the light-harvesting systems in photosynthesis. Here, we report the structure and function of the O. tauri photosystem I (PSI) supercomplex in low light conditions, where it expands its photon-absorbing capacity by assembling with the light-harvesting complexes I (LHCI) and a prasinophyte-specific light-harvesting complex (Lhcp). The architecture of the supercomplex exhibits hybrid features of the plant-type and the green algal-type PSI supercomplexes, consisting of a PSI core, an Lhca1-Lhca4-Lhca2-Lhca3 belt attached on one side and an Lhca5-Lhca6 heterodimer associated on the other side between PsaG and PsaH. Interestingly, nine Lhcp subunits, including one Lhcp1 monomer with a phosphorylated amino-terminal threonine and eight Lhcp2 monomers, oligomerize into three trimers and associate with PSI on the third side between Lhca6 and PsaK. The Lhcp1 phosphorylation and the light-harvesting capacity of PSI were subjected to reversible photoacclimation, suggesting that the formation of OtPSI-LHCI-Lhcp supercomplex is likely due to a phosphorylation-dependent mechanism induced by changes in light intensity. Notably, this supercomplex did not exhibit far-red peaks in the 77 K fluorescence spectra, which is possibly due to the weak coupling of the chlorophyll a603-a609 pair in OtLhca1-4. The photosystem I supercomplex from a primordial green alga Ostreococcus tauri harbors three light-harvesting complex trimers.,Ishii A, Shan J, Sheng X, Kim E, Watanabe A, Yokono M, Noda C, Song C, Murata K, Liu Z, Minagawa J Elife. 2023 Mar 23;12:e84488. doi: 10.7554/eLife.84488. PMID:36951548 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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