1ilx
From Proteopedia
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Excited State Dynamics in Photosystem II Revised. New Insights from the X-ray Structure.
Overview
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.
About this Structure
1ILX is a Protein complex structure of sequences from Synechococcus elongatus with MN, FE, CD, CLA, PHO, HEM and PL9 as ligands. Full crystallographic information is available from OCA.
Reference
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
Page seeded by OCA on Sat Nov 24 22:12:02 2007
Categories: Protein complex | Synechococcus elongatus | Bruce, D. | Orth, P. | Owens, T.G. | Vasilev, S. | Zouni, A. | CD | CLA | FE | HEM | MN | PHO | PL9 | Antenna chlorophyll | Exitation transfer
