1ilx

Excited State Dynamics in Photosystem II Revised. New Insights from the X-ray Structure.

spinqualitylabelsall models 1ilx, resolution 3.80Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1ilx is a 18 chain structure with sequence from Synechococcus elongatus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.8Å Ligands: CD, CLA, FE, HEM, MN, PHO, PL9 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The heart of oxygenic photosynthesis is photosystem II (PSII), a multisubunit protein complex that uses solar energy to drive the splitting of water and production of molecular oxygen. The effectiveness of the photochemical reaction center of PSII depends on the efficient transfer of excitation energy from the surrounding antenna chlorophylls. A kinetic model for PSII, based on the x-ray crystal structure coordinates of 37 antenna and reaction center pigment molecules, allows us to map the major energy transfer routes from the antenna chlorophylls to the reaction center chromophores. The model shows that energy transfer to the reaction center is slow compared with the rate of primary electron transport and depends on a few bridging chlorophyll molecules. This unexpected energetic isolation of the reaction center in PSII is similar to that found in the bacterial photosystem, conflicts with the established view of the photophysics of PSII, and may be a functional requirement for primary photochemistry in photosynthesis. In addition, the model predicts a value for the intrinsic photochemical rate constant that is 4 times that found in bacterial reaction centers. Excited-state dynamics in photosystem II: insights from the x-ray crystal structure.,Vasil'ev S, Orth P, Zouni A, Owens TG, Bruce D Proc Natl Acad Sci U S A. 2001 Jul 17;98(15):8602-7. PMID:11459991 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Photosystem II 3D structures

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