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| Content Provider | PubMed Central |
|---|---|
| Author | Sproviero, Eduardo M. Katherine, Shinopoulos Gascón, José A. Mcevoy, James P. Brudvig, Gary W. Batista, Victor S. |
| Copyright Year | 2007 |
| Abstract | This paper reports computational studies of substrate water binding to the oxygen-evolving centre (OEC) of photosystem II (PSII), completely ligated by amino acid residues, water, hydroxide and chloride. The calculations are based on quantum mechanics/molecular mechanics hybrid models of the OEC of PSII, recently developed in conjunction with the X-ray crystal structure of PSII from the cyanobacterium Thermosynechococcus elongatus. The model OEC involves a cuboidal Mn3CaO4Mn metal cluster with three closely associated manganese ions linked to a single μ4-oxo-ligated Mn ion, often called the ‘dangling manganese’. Two water molecules bound to calcium and the dangling manganese are postulated to be substrate molecules, responsible for dioxygen formation. It is found that the energy barriers for the Mn(4)-bound water agree nicely with those of model complexes. However, the barriers for Ca-bound waters are substantially larger. Water binding is not simply correlated to the formal oxidation states of the metal centres but rather to their corresponding electrostatic potential atomic charges as modulated by charge-transfer interactions. The calculations of structural rearrangements during water exchange provide support for the experimental finding that the exchange rates with bulk 18O-labelled water should be smaller for water molecules coordinated to calcium than for water molecules attached to the dangling manganese. The models also predict that the S1→S2 transition should produce opposite effects on the two water-exchange rates. |
| Related Links | http://dx.doi.org/10.1098/rstb.2007.2210 |
| Ending Page | 1156 |
| Page Count | 8 |
| Starting Page | 1149 |
| File Format | |
| ISSN | 09628436 |
| e-ISSN | 14712970 |
| Journal | Philosophical Transactions of the Royal Society B: Biological Sciences |
| Issue Number | 1494 |
| Volume Number | 363 |
| Language | English |
| Publisher | The Royal Society |
| Publisher Date | 2008-03-27 |
| Access Restriction | Open |
| Rights Holder | The Royal Society |
| Subject Keyword | Biochemistry, Genetics and Molecular Biology(all) Agricultural and Biological Sciences(all) Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Biochemistry, Genetics and Molecular Biology Agricultural and Biological Sciences |
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