3bz1 | pdb_00003bz1

Crystal Structure of cyanobacterial Photosystem II (part 1 of 2). This file contains first monomer of PSII dimer

spinqualitylabelsall models 3bz1, resolution 2.90Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3bz1 is a 20 chain structure with sequence from Thermosynechococcus elongatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: BCR, BCT, CA, CL, CLA, DGD, FE2, HEM, LHG, LMG, LMT, OEC, PHO, PL9, SQD NonStd Res: UNK Related: 3bz2 Resources: FirstGlance, OCA, RCSB, PDBsum Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed Photosystem II (PSII) is a large homodimeric protein-cofactor complex located in the photosynthetic thylakoid membrane that acts as light-driven water:plastoquinone oxidoreductase. The crystal structure of PSII from Thermosynechococcus elongatus at 2.9-A resolution allowed the unambiguous assignment of all 20 protein subunits and complete modeling of all 35 chlorophyll a molecules and 12 carotenoid molecules, 25 integral lipids and 1 chloride ion per monomer. The presence of a third plastoquinone Q(C) and a second plastoquinone-transfer channel, which were not observed before, suggests mechanisms for plastoquinol-plastoquinone exchange, and we calculated other possible water or dioxygen and proton channels. Putative oxygen positions obtained from a Xenon derivative indicate a role for lipids in oxygen diffusion to the cytoplasmic side of PSII. The chloride position suggests a role in proton-transfer reactions because it is bound through a putative water molecule to the Mn(4)Ca cluster at a distance of 6.5 A and is close to two possible proton channels. Cyanobacterial photosystem II at 2.9-A resolution and the role of quinones, lipids, channels and chloride.,Guskov A, Kern J, Gabdulkhakov A, Broser M, Zouni A, Saenger W Nat Struct Mol Biol. 2009 Mar;16(3):334-42. Epub 2009 Feb 15. PMID:19219048 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Cytochrome c Photosystem II

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