7piw

Stacked stretched Dunaliella PSII

spinqualitylabelsall models 7piw, resolution 4.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7piw is a 36 chain structure with sequence from Dunaliella salina. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 4Å Ligands: 3PH, 4RF, BCR, BCT, C7Z, CL, CLA, DGA, DGD, ERG, FE2, GOL, HEM, LHG, LMG, LMK, LMT, LPX, LUT, NA, NEX, PHO, PL9, PTY, RRX, SEP, SPH, SQD, XAT Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Photosystem II (PSII) generates an oxidant whose redox potential is high enough to enable water oxidation , a substrate so abundant that it assures a practically unlimited electron source for life on earth . Our knowledge on the mechanism of water photooxidation was greatly advanced by high-resolution structures of prokaryotic PSII . Here, we show high-resolution cryogenic electron microscopy (cryo-EM) structures of eukaryotic PSII from the green alga Dunaliella salina at two distinct conformations. The conformers are also present in stacked PSII, exhibiting flexibility that may be relevant to the grana formation in chloroplasts of the green lineage. CP29, one of PSII associated light-harvesting antennae, plays a major role in distinguishing the two conformations of the supercomplex. We also show that the stacked PSII dimer, a form suggested to support the organisation of thylakoid membranes , can appear in many different orientations providing a flexible stacking mechanism for the arrangement of grana stacks in thylakoids. Our findings provide a structural basis for the heterogenous nature of the eukaryotic PSII on multiple levels. Structure of Dunaliella photosystem II reveals conformational flexibility of stacked and unstacked supercomplexes.,Caspy I, Fadeeva M, Mazor Y, Nelson N Elife. 2023 Feb 17;12:e81150. doi: 10.7554/eLife.81150. PMID:36799903 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Photosystem II 3D structures

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