Modeling the Oxygen-Evolving Complex of Photosystem II. Synthesis, Redox Properties, and Core Interconversion Studies of Dimanganese Complexes Having {MnIII2(μ-O)(μ-OAc)2}2+, {MnIIIMnIV(μ-O)2(μ-OAc)}2+, and {MnIV2(μ-O)2(μ-OAc)}3+Cores with MeL as a Terminal Ligand:  A New Asymmetric Mixed-Valence Core†,1

1998 ◽  
Vol 37 (10) ◽  
pp. 2373-2382 ◽  
Author(s):  
Tapan Kumar Lal ◽  
Rabindranath Mukherjee
Keyword(s):  
Photosystem Ii ◽  
Mixed Valence ◽  
Redox Properties ◽  
Oxygen Evolving Complex ◽  
Terminal Ligand ◽  
Oxygen Evolving

Hyperfine tensors for a model system for the oxygen evolving complex of photosystem II: calculation of the anisotropy shift that occurs beyond the strong exchange limit

2019 ◽  
Vol 21 (41) ◽  
pp. 22902-22909
Author(s):  
Christine Mehlich ◽  
Christoph van Wüllen
Keyword(s):  
Photosystem Ii ◽  
Density Functional Calculations ◽  
Density Functional ◽  
Mixed Valence ◽  
Model System ◽  
Manganese Complex ◽  
Broken Symmetry ◽  
Oxygen Evolving Complex ◽  
Strong Exchange ◽  
Oxygen Evolving

Broken-symmetry density functional calculations have been used to calculate effective 55Mn hyperfine (A) tensors for a mixed-valence tetranuclear manganese complex, a model system for the S2 state of the oxygen-evolving complex of photosystem II.

scholarly journals Structural Changes in the Acceptor Site of Photosystem II upon Ca2+/Sr2+ Exchange in the Mn4CaO5 Cluster Site and the Possible Long-Range Interactions

Biomolecules ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 371
Author(s):  
Koua
Keyword(s):  
Crystal Structure ◽  
Photosystem Ii ◽  
Long Range ◽  
Electron Acceptor ◽  
Structural Changes ◽  
Acceptor Site ◽  
Oxygen Evolving Complex ◽  
Long Range Interactions ◽  
Structural Perturbations ◽  
Oxygen Evolving

The Mn4CaO5 cluster site in the oxygen-evolving complex (OEC) of photosystem II (PSII) undergoes structural perturbations, such as those induced by Ca2+/Sr2+ exchanges or Ca/Mn removal. These changes have been known to induce long-range positive shifts (between +30 and +150 mV) in the redox potential of the primary quinone electron acceptor plastoquinone A (QA), which is located 40 Å from the OEC. To further investigate these effects, we reanalyzed the crystal structure of Sr-PSII resolved at 2.1 Å and compared it with the native Ca-PSII resolved at 1.9 Å. Here, we focus on the acceptor site and report the possible long-range interactions between the donor, Mn4Ca(Sr)O5 cluster, and acceptor sites.

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