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Detection of one slowly exchanging substrate water molecule in the S3 state of photosystem II.
Open accessAbstract
The exchangeability of the substrate water molecules at the catalytic site of water oxidation in photosystem II has been probed by isotope-exchange measurements using mass spectrometric detection of flash-induced oxygen evolution. A stirred sample chamber was constructed to reduce the lag time between injection of H2(18)O and the detecting flash by a factor of more than 1000 compared to the original experiments by R. Radmer and O. Ollinger [(1986) FEBS Lett. 195, 285-289]. Our data show that there is a slow (t1/2 approximately 500 ms, 10 degrees C) and a fast (t1/2 <25 ms, 10 degrees C) exchanging substrate water molecule in the S3 state of photosystem II. The slow exchange is coupled with an activation energy of about 75 kJ/mol and is discussed in terms of a terminal manganese oxo ligand, while the faster exchanging substrate molecule may represent a water molecule not directly bound to the manganese center.
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Citations
Cited by
Photosynthetic energy conversion: natural and artificial
Barber, J. (2009) · Chem. Soc. Rev. · doi:10.1039/b802262n · Cited by 1,843
The Mechanism of Water Oxidation: From Electrolysis via Homogeneous to Biological Catalysis
Dau, H., Limberg, C., Reier, T., Risch, M., Roggan, S., & Strasser, P. (2010) · ChemCatChem · doi:10.1002/cctc.201000126 · Cited by 1,783
Proton-coupled electron transfer
Huynh, M. H. V., & Meyer, T. J. (2007) · Chemical Reviews · doi:10.1021/cr0500030 · Cited by 1,659
Solar water-splitting into H2 and O2: design principles of photosystem II and hydrogenases
Lubitz, W., Reijerse, E. J., & Messinger, J. (2008) · Energy & Environmental Science · doi:10.1039/b808792j · Cited by 408
Self-citationFunctional models for the oxygen-evolving complex of photosystem II
Cady, C. W., Crabtree, R. H., & Brudvig, G. W. (2008) · Coordination Chemistry Reviews · doi:10.1016/j.ccr.2007.06.002 · Cited by 403
Metadata
- Authors
- Messinger, J., Badger, M., & Wydrzynski, T.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 1995-04-11
- Volume
- 92
- Issue
- 8
- Pages
- 3209-3213
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2066652100
- Cited by
- 264
- References
- 0
- FWCI
- 2.96
- Type
- journal article
- Language
- en
- Open access
- green
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- Messinger, J., Badger, M., & Wydrzynski, T. (1995). Detection of one slowly exchanging substrate water molecule in the S3 state of photosystem II. Proceedings of the National Academy of Sciences. https://doi.org/10.1073/pnas.92.8.3209
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