7eda | pdb_00007eda

Structure of monomeric photosystem II

spinqualitylabelsall models 7eda, resolution 2.78Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7eda is a 10 chain structure with sequence from Thermostichus vulcanus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 2.78Å Ligands: BCR, BCT, CLA, DGD, FE2, FME, HEC, HEM, HSK, LHG, LMG, PHO, PL9, RRX, SQD Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PSBA_THEVL D1 (PsbA) and D2 (PsbD) bind P680, the primary electron donor of photosystem II (PSII) as well as electron acceptors. PSII is a light-driven water plastoquinone oxidoreductase, using light energy to abstract electrons from H(2)O, generating a proton gradient subsequently used for ATP formation.[HAMAP-Rule:MF_01379] Publication Abstract from PubMed Photosystem II (PSII) functions mainly as a dimer to catalyze the light energy conversion and water oxidation reactions. However, monomeric PSII also exists and functions in vivo in some cases. The crystal structure of monomeric PSII has been solved at 3.6 A resolution, but it is still not clear which factors contribute to the formation of the dimer. Here, we solved the structure of PSII monomer at a resolution of 2.78 A using cryo-electron microscopy (cryo-EM). From our cryo-EM density map, we observed apparent differences in pigments and lipids in the monomer-monomer interface between the PSII monomer and dimer. One beta-carotene and two sulfoquinovosyl diacylglycerol (SQDG) molecules are found in the monomer-monomer interface of the dimer structure but not in the present monomer structure, although some SQDG and other lipid molecules are found in the analogous region of the low-resolution crystal structure of the monomer, or cryo-EM structure of an apo-PSII monomer lacking the extrinsic proteins from Synechocystis sp. PCC 6803. In the current monomer structure, a large part of the PsbO subunit was also found to be disordered. These results indicate the importance of the beta-carotene, SQDG and PsbO in formation of the PSII dimer. Cryo-EM structure of monomeric photosystem II at 2.78 A resolution reveals factors important for the formation of dimer.,Yu H, Hamaguchi T, Nakajima Y, Kato K, Kawakami K, Akita F, Yonekura K, Shen JR Biochim Biophys Acta Bioenerg. 2021 Oct 1;1862(10):148471. doi: , 10.1016/j.bbabio.2021.148471. Epub 2021 Jul 1. PMID:34216574 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome C 3D structures Photosystem II 3D structures

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