Water-oxidizing complex in Photosystem II: Its structure and relation to manganese-oxide based catalysts

MM Najafpour, I Zaharieva, Z Zand, SM Hosseini… - Coordination Chemistry …, 2020 - Elsevier
Cyanobacteria, green algae, and higher plants provide the major part of molecular O 2 of
Earth atmosphere via water oxidation of oxygenic photosynthesis. The water-oxidizing …

Missing pieces in the puzzle of biological water oxidation

DA Pantazis - ACS Catalysis, 2018 - ACS Publications
The sunlight-powered oxidation of water by photosystem II (PSII) of algae, plants, and
cyanobacteria underpins the energy conversion processes that sustain most life on our …

Manganese-calcium/strontium heterometallic compounds and their relevance for the oxygen-evolving center of photosystem II

B Gerey, E Gouré, J Fortage, J Pécaut… - Coordination Chemistry …, 2016 - Elsevier
Manganese–calcium and manganese–strontium heteronuclear compounds are of
considerable current interest in the context of modeling the structure of the oxygen-evolving …

[HTML][HTML] The low spin-high spin equilibrium in the S2-state of the water oxidizing enzyme

A Boussac, I Ugur, A Marion, M Sugiura… - … et Biophysica Acta (BBA …, 2018 - Elsevier
Abstract In Photosystem II (PSII), the Mn 4 CaO 5-cluster of the active site advances through
five sequential oxidation states (S 0 to S 4) before water is oxidized and O 2 is generated …

[HTML][HTML] Redox-coupled substrate water reorganization in the active site of photosystem II—the role of calcium in substrate water delivery

I Ugur, AW Rutherford, VRI Kaila - Biochimica et Biophysica Acta (BBA) …, 2016 - Elsevier
Photosystem II (PSII) catalyzes light-driven water splitting in nature and is the key enzyme for
energy input into the biosphere. Important details of its mechanism are not well understood …

[HTML][HTML] Electron transfer pathways from the S2-states to the S3-states either after a Ca2+/Sr2+ or a Cl−/I− exchange in Photosystem II from Thermosynechococcus …

A Boussac, AW Rutherford, M Sugiura - Biochimica et Biophysica Acta (BBA …, 2015 - Elsevier
The site for water oxidation in Photosystem II (PSII) goes through five sequential oxidation
states (S 0 to S 4) before O 2 is evolved. It consists of a Mn 4 CaO 5-cluster close to a redox …

Exchange Coupling Interactions from the Density Matrix Renormalization Group and N-Electron Valence Perturbation Theory: Application to a Biomimetic Mixed …

M Roemelt, V Krewald, DA Pantazis - Journal of Chemical Theory …, 2018 - ACS Publications
The accurate description of magnetic level energetics in oligonuclear exchange-coupled
transition-metal complexes remains a formidable challenge for quantum chemistry. The …

Evidence from FTIR difference spectroscopy that a substrate H2O molecule for O2 formation in photosystem II is provided by the Ca ion of the catalytic Mn4CaO5 …

CJ Kim, RJ Debus - Biochemistry, 2017 - ACS Publications
The O2-producing Mn4CaO5 catalyst in photosystem II oxidizes two water molecules
(substrate) to produce one O2 molecule. Considerable evidence supports the identification …

Spin, Valence, and Structural Isomerism in the S3 State of the Oxygen-Evolving Complex of Photosystem II as a Manifestation of Multimetallic Cooperativity

H Isobe, M Shoji, T Suzuki, JR Shen… - Journal of chemical …, 2019 - ACS Publications
Photosynthetic water oxidation is catalyzed by a Mn4CaO5-cluster in photosystem II through
an S-state cycle. Understanding the roles of heterogeneity in each S-state, as identified …

CaMn3IVO4 Cubane Models of the Oxygen‐Evolving Complex: Spin Ground States S<9/2 and the Effect of Oxo Protonation

HB Lee, AA Shiau, DA Marchiori, PH Oyala… - Angewandte …, 2021 - Wiley Online Library
We report the single crystal XRD and MicroED structure, magnetic susceptibility, and EPR
data of a series of CaMn3IVO4 and YMn3IVO4 complexes as structural and spectroscopic …