151
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Schilling M, Luber S. Computational Modeling of Cobalt-Based Water Oxidation: Current Status and Future Challenges. Front Chem 2018; 6:100. [PMID: 29721491 PMCID: PMC5915471 DOI: 10.3389/fchem.2018.00100] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Accepted: 03/20/2018] [Indexed: 12/19/2022] Open
Abstract
A lot of effort is nowadays put into the development of novel water oxidation catalysts. In this context, mechanistic studies are crucial in order to elucidate the reaction mechanisms governing this complex process, new design paradigms and strategies how to improve the stability and efficiency of those catalysts. This review is focused on recent theoretical mechanistic studies in the field of homogeneous cobalt-based water oxidation catalysts. In the first part, computational methodologies and protocols are summarized and evaluated on the basis of their applicability toward real catalytic or smaller model systems, whereby special emphasis is laid on the choice of an appropriate model system. In the second part, an overview of mechanistic studies is presented, from which conceptual guidelines are drawn on how to approach novel studies of catalysts and how to further develop the field of computational modeling of water oxidation reactions.
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Affiliation(s)
- Mauro Schilling
- Department of Chemistry, University of Zürich, Zurich, Switzerland
| | - Sandra Luber
- Department of Chemistry, University of Zürich, Zurich, Switzerland
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152
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Björn LO. Photoenzymes and Related Topics: An Update. Photochem Photobiol 2018; 94:459-465. [PMID: 29441583 DOI: 10.1111/php.12892] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2017] [Accepted: 12/20/2017] [Indexed: 12/11/2022]
Abstract
Photoenzymes are enzymes that catalyze photochemical reactions. For a long time, it was believed that only two types of photoenzymes exist: light-dependent NADPH:protochlorophyllide oxidoreductase and photolyase. However, other photoenzymes have now been discovered, most recently fatty acid photodecarboxylase.
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153
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Shoji M, Isobe H, Tanaka A, Fukushima Y, Kawakami K, Umena Y, Kamiya N, Nakajima T, Yamaguchi K. Understanding Two Different Structures in the Dark Stable State of the Oxygen-Evolving Complex of Photosystem II: Applicability of the Jahn-Teller Deformation Formula. CHEMPHOTOCHEM 2018; 2:257-270. [PMID: 29577075 PMCID: PMC5861676 DOI: 10.1002/cptc.201700162] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Revised: 11/02/2017] [Indexed: 11/11/2022]
Abstract
Tanaka et al. (J. Am. Chem. Soc., 2017, 139, 1718) recently reported the three-dimensional (3D) structure of the oxygen evolving complex (OEC) of photosystem II (PSII) by X-ray diffraction (XRD) using extremely low X-ray doses of 0.03 and 0.12 MGy. They observed two different 3D structures of the CaMn4O5 cluster with different hydrogen-bonding interactions in the S1 state of OEC keeping the surrounding polypeptide frameworks of PSII the same. Our Jahn-Teller (JT) deformation formula based on large-scale quantum mechanics/molecular mechanics (QM/MM) was applied for these low-dose XRD structures, elucidating important roles of JT effects of the MnIII ion for subtle geometric distortions of the CaMn4O5 cluster in OEC of PSII. The JT deformation formula revealed the similarity between the low-dose XRD and damage-free serial femtosecond X-ray diffraction (SFX) structures of the CaMn4O5 cluster in the dark stable state. The extremely low-dose XRD structures were not damaged by X-ray irradiation. Implications of the present results are discussed in relation to recent SFX results and a blue print for the design of artificial photocatalysts for water oxidation.
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Affiliation(s)
- Mitsuo Shoji
- Center of Computational SciencesTsukuba University, TsukubaIbaraki305–8577Japan
| | - Hiroshi Isobe
- Graduate School of Natural Science and TechnologyOkayama UniversityOkayama700–8530Japan
| | - Ayako Tanaka
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA)Osaka City UniversityOsaka558–8585Japan
| | - Yoshimasa Fukushima
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA)Osaka City UniversityOsaka558–8585Japan
| | - Keisuke Kawakami
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA)Osaka City UniversityOsaka558–8585Japan
| | - Yasufumi Umena
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA)Osaka City UniversityOsaka558–8585Japan
| | - Nobuo Kamiya
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA)Osaka City UniversityOsaka558–8585Japan
| | - Takahito Nakajima
- Riken Advanced Institute for Computational Science, Chuo-KuKobe, Hyogo650-0047Japan
| | - Kizashi Yamaguchi
- Riken Advanced Institute for Computational Science, Chuo-KuKobe, Hyogo650-0047Japan
- Institute for Nanoscience DesignOsaka University, ToyonakaOsaka560–8531Japan
- Handairigaku Techno-Research, ToyonakaOsaka560-0043Japan
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154
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Yamaguchi K, Shoji M, Isobe H, Yamanaka S, Kawakami T, Yamada S, Katouda M, Nakajima T. Theory of chemical bonds in metalloenzymes XXI. Possible mechanisms of water oxidation in oxygen evolving complex of photosystem II. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1428375] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Kizashi Yamaguchi
- Institute for Nanoscience Design, Osaka University, Osaka, Japan
- Handairigaku Techno-Research, Osaka Univeristy, Osaka, Japan
- Riken Advanced Institute for Computational Science (AICS), Hyogo, Japan
| | - Mitsuo Shoji
- Center for Computational Sciences, University of Tsukuba, Ibaraki, Japan
| | - Hiroshi Isobe
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | | | - Takashi Kawakami
- Graduate School of Science, Osaka University, Osaka, Japan
- Riken Advanced Institute for Computational Science (AICS), Hyogo, Japan
| | - Satoru Yamada
- Riken Advanced Institute for Computational Science (AICS), Hyogo, Japan
| | - Michio Katouda
- Riken Advanced Institute for Computational Science (AICS), Hyogo, Japan
| | - Takahito Nakajima
- Riken Advanced Institute for Computational Science (AICS), Hyogo, Japan
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155
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Decaneto E, Vasilevskaya T, Kutin Y, Ogata H, Grossman M, Sagi I, Havenith M, Lubitz W, Thiel W, Cox N. Solvent water interactions within the active site of the membrane type I matrix metalloproteinase. Phys Chem Chem Phys 2018; 19:30316-30331. [PMID: 28951896 DOI: 10.1039/c7cp05572b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Matrix metalloproteinases (MMP) are an important family of proteases which catalyze the degradation of extracellular matrix components. While the mechanism of peptide cleavage is well established, the process of enzyme regeneration, which represents the rate limiting step of the catalytic cycle, remains unresolved. This step involves the loss of the newly formed N-terminus (amine) and C-terminus (carboxylate) protein fragments from the site of catalysis coupled with the inclusion of one or more solvent waters. Here we report a novel crystal structure of membrane type I MMP (MT1-MMP or MMP-14), which includes a small peptide bound at the catalytic Zn site via its C-terminus. This structure models the initial product state formed immediately after peptide cleavage but before the final proton transfer to the bound amine; the amine is not present in our system and as such proton transfer cannot occur. Modeling of the protein, including earlier structural data of Bertini and coworkers [I. Bertini, et al., Angew. Chem., Int. Ed., 2006, 45, 7952-7955], suggests that the C-terminus of the peptide is positioned to form an H-bond network to the amine site, which is mediated by a single oxygen of the functionally important Glu240 residue, facilitating efficient proton transfer. Additional quantum chemical calculations complemented with magneto-optical and magnetic resonance spectroscopies clarify the role of two additional, non-catalytic first coordination sphere waters identified in the crystal structure. One of these auxiliary waters acts to stabilize key intermediates of the reaction, while the second is proposed to facilitate C-fragment release, triggered by protonation of the amine. Together these results complete the enzymatic cycle of MMPs and provide new design criteria for inhibitors with improved efficacy.
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Affiliation(s)
- Elena Decaneto
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße. 34-36, D-45470, Mülheim an der Ruhr, Germany.
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156
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Petrie S, Stranger R, Pace RJ. What Mn K β spectroscopy reveals concerning the oxidation states of the Mn cluster in photosystem II. Phys Chem Chem Phys 2018; 19:27682-27693. [PMID: 28983541 DOI: 10.1039/c7cp04797e] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The oxygen evolving complex, (OEC) in Photosystem II contains a Mn4Ca cluster and catalyses oxidation of water to molecular oxygen and protons, the most energetically demanding reaction in nature. The catalytic mechanism remains unresolved and the precise Mn oxidation levels through which the cluster cycles during functional turnover are controversial. Two proposals for these redox levels exist; the 'high' and 'low' oxidation state paradigms, which differ systematically by two oxidation equivalents throughout the redox accumulating catalytic S state cycle (states S0…S3). Presently the 'high' paradigm is more favored. For S1 the assumed mean redox levels of Mn are 3.5 (high) and 3.0 (low) respectively. Mn K region X-ray spectroscopy has been extensively used to examine the OEC Mn oxidation levels, with Kβ emission spectroscopy increasingly the method of choice. Here we review the results from application of this and closely related techniques to PS II, building on our earlier examination of these and other data on the OEC oxidation states (Pace et al., Dalton Trans., 2012, 41, 11145). We compare the most recent results with a range of earlier Mn Kβ experiments on the photosystem and related model Mn systems. New analyses of these data are given, highlighting certain key spectral considerations which appear not to have been sufficiently appreciated earlier. These show that the recent and earlier PS II Kβ results have a natural internal consistency, leading to the strong conclusion that the low paradigm oxidation state assignment for the functional OEC is favoured.
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Affiliation(s)
- Simon Petrie
- Research School of Chemistry, College of Physical & Mathematical Sciences, College of Science, Australian National University, Canberra, ACT 0200, Australia.
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157
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Baituti B. Computational studies of the Mn 4/Ca cluster in photosystem II. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2018. [DOI: 10.1142/s0219633618500074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Computational chemistry with the data from more detailed X-ray diffraction (XRD) oxygen evolving complex (OEC) structure has been used extensively of late in exploring the mechanisms of water oxidation in the OEC. The study reported in this paper involves density functional theory (DFT) calculations to investigate whether the data are in agreement with the four manganese ions in the OEC, being organized as a ‘3[Formula: see text]1’ (trimer plus one) model [Gatt et al. Angewandte Chemie International Edition, 51, 12025–12028, 2012; Petrie et al. Chemistry - A European Journal, 21, 6780–6792, 2015; Terrett et al. Chemical Communications, 50, 3187–3190, 2014] or ‘dimer of dimers’ model. [Terrett et al. Journal of Inorganic Biochemistry, 162, 178–189, 2016]. The data analysis method used involves quantum chemical DFT calculations on relevant models of the OEC cluster. DFT calculations were performed using both the so-called ‘open’ and ‘closed’ forms [Terrett et al. Journal of Inorganic Biochemistry, 162, 178–189, 2016] of the S2 OEC structure models with total spin ([Formula: see text]) 1/2, 7/2, 9/2 and 15/2 within the MnIII MnIV MnIII MnIII ‘low’ oxidation paradigm to examine exchange coupling within the OEC cluster. The results show that the [Formula: see text]-coupling in the ‘closed’ form: [Formula: see text][Formula: see text]cm[Formula: see text], [Formula: see text][Formula: see text]cm[Formula: see text], [Formula: see text][Formula: see text]cm[Formula: see text] and [Formula: see text]–[Formula: see text][Formula: see text]cm[Formula: see text]. In the ‘closed’ form, [Formula: see text] and [Formula: see text] represent the two largest exchange interactions within the manganese cluster, whereas [Formula: see text] and [Formula: see text] are small and almost net cancel. The magnetic coupling between the four Mn ions is close to ‘dimer of dimers’, with both dimers anti-ferromagnetically coupled internally and with weak inter-dimer net coupling.
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Affiliation(s)
- Bernard Baituti
- Botswana International University of Science and Technology, Private Bag 16, Palapye, Botswana
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158
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Marchiori DA, Oyala PH, Debus RJ, Stich TA, Britt RD. Structural Effects of Ammonia Binding to the Mn4CaO5 Cluster of Photosystem II. J Phys Chem B 2018; 122:1588-1599. [DOI: 10.1021/acs.jpcb.7b11101] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- David A. Marchiori
- Department
of Chemistry, University of California, Davis, Davis, California 95616, United States
| | - Paul H. Oyala
- Department
of Chemistry, University of California, Davis, Davis, California 95616, United States
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Richard J. Debus
- Department
of Biochemistry, University of California, Riverside, Riverside, California 92521, United States
| | - Troy A. Stich
- Department
of Chemistry, University of California, Davis, Davis, California 95616, United States
| | - R. David Britt
- Department
of Chemistry, University of California, Davis, Davis, California 95616, United States
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159
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Beal NJ, Corry TA, O'Malley PJ. A Comparison of Experimental and Broken Symmetry Density Functional Theory (BS-DFT) Calculated Electron Paramagnetic Resonance (EPR) Parameters for Intermediates Involved in the S 2 to S 3 State Transition of Nature's Oxygen Evolving Complex. J Phys Chem B 2018; 122:1394-1407. [PMID: 29300480 DOI: 10.1021/acs.jpcb.7b10843] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A broken symmetry density functional theory (BS-DFT) magnetic analysis of the S2, S2YZ•, and S3 states of Nature's oxygen evolving complex is performed for both the native Ca and Sr substituted forms. Good agreement with experiment is observed between the tyrosyl calculated g-tensor and 1H hyperfine couplings for the native Ca form. Changes in the hydrogen bonding environment of the tyrosyl radical in S2YZ• caused by Sr substitution lead to notable changes in the calculated g-tensor of the tyrosyl radical. Comparison of calculated and experimental 55Mn hyperfine couplings for the S3 state presently favors an open cubane form of the complex with an additional OH ligand coordinating to MnD. In Ca models, this additional ligation can arise by closed-cubane form deprotonation of the Ca ligand W3 in the S2YZ• state accompanied by spontaneous movement to the vacant Mn coordination site or by addition of an external OH group. For the Sr form, no spontaneous movement of W3 to the vacant Mn coordination site is observed in contrast to the native Ca form, a difference which may lead to the reduced catalytic activity of the Sr substituted form. BS-DFT studies on peroxo models of S3 as indicated by a recent X-ray free electron laser (XFEL) crystallography study give rise to a structural model compatible with experimental data and an S = 3 ground state compatible with EPR studies.
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Affiliation(s)
- Nathan J Beal
- School of Chemistry, The University of Manchester , Manchester M13 9PL, U.K
| | - Thomas A Corry
- School of Chemistry, The University of Manchester , Manchester M13 9PL, U.K
| | - Patrick J O'Malley
- School of Chemistry, The University of Manchester , Manchester M13 9PL, U.K
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160
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Hogue RW, Lepper CP, Jameson GB, Brooker S. Manipulating and quantifying spin states in solution as a function of pressure and temperature. Chem Commun (Camb) 2018; 54:172-175. [DOI: 10.1039/c7cc08104a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This new ‘single compartment tube’ 1H NMR methodology for determining spin states under high pressures (up to 240 MPa) has implications for the study of magnetic, catalytic and biochemical processes.
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Affiliation(s)
- Ross W. Hogue
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
| | - Christopher P. Lepper
- Chemistry – Institute of Fundamental Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology
- Massey University
- Palmerston North 4442
- New Zealand
| | - Geoffrey B. Jameson
- Chemistry – Institute of Fundamental Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology
- Massey University
- Palmerston North 4442
- New Zealand
| | - Sally Brooker
- Department of Chemistry and MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin 9054
- New Zealand
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161
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Hazari AS, Indra A, Lahiri GK. Mixed valency in ligand-bridged diruthenium frameworks: divergences and perspectives. RSC Adv 2018; 8:28895-28908. [PMID: 35547993 PMCID: PMC9084559 DOI: 10.1039/c8ra03206h] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Accepted: 08/01/2018] [Indexed: 11/21/2022] Open
Abstract
Emerging fundamental issues involving intramolecular electron transfer at the mixed valent diruthenium frameworks and its application prospects have been highlighted.
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Affiliation(s)
| | - Arindam Indra
- Department of Chemistry
- Indian Institute of Technology (Banaras Hindu University)
- Varanasi
- India
| | - Goutam Kumar Lahiri
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
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162
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Roemelt M, Krewald V, Pantazis DA. Exchange Coupling Interactions from the Density Matrix Renormalization Group and N-Electron Valence Perturbation Theory: Application to a Biomimetic Mixed-Valence Manganese Complex. J Chem Theory Comput 2017; 14:166-179. [PMID: 29211960 DOI: 10.1021/acs.jctc.7b01035] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The accurate description of magnetic level energetics in oligonuclear exchange-coupled transition-metal complexes remains a formidable challenge for quantum chemistry. The density matrix renormalization group (DMRG) brings such systems for the first time easily within reach of multireference wave function methods by enabling the use of unprecedentedly large active spaces. But does this guarantee systematic improvement in predictive ability and, if so, under which conditions? We identify operational parameters in the use of DMRG using as a test system an experimentally characterized mixed-valence bis-μ-oxo/μ-acetato Mn(III,IV) dimer, a model for the oxygen-evolving complex of photosystem II. A complete active space of all metal 3d and bridge 2p orbitals proved to be the smallest meaningful starting point; this is readily accessible with DMRG and greatly improves on the unrealistic metal-only configuration interaction or complete active space self-consistent field (CASSCF) values. Orbital optimization is critical for stabilizing the antiferromagnetic state, while a state-averaged approach over all spin states involved is required to avoid artificial deviations from isotropic behavior that are associated with state-specific calculations. Selective inclusion of localized orbital subspaces enables probing the relative contributions of different ligands and distinct superexchange pathways. Overall, however, full-valence DMRG-CASSCF calculations fall short of providing a quantitative description of the exchange coupling owing to insufficient recovery of dynamic correlation. Quantitatively accurate results can be achieved through a DMRG implementation of second order N-electron valence perturbation theory (NEVPT2) in conjunction with a full-valence metal and ligand active space. Perspectives for future applications of DMRG-CASSCF/NEVPT2 to exchange coupling in oligonuclear clusters are discussed.
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Affiliation(s)
- Michael Roemelt
- Lehrstuhl für Theoretische Chemie, Ruhr-University Bochum , 44780 Bochum, Germany.,Max Planck Institute for Coal Research, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Vera Krewald
- Department of Chemistry, University of Bath , Bath BA2 7AY, United Kingdom
| | - Dimitrios A Pantazis
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
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163
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Beal NJ, Corry TA, O’Malley PJ. Comparison between Experimental and Broken Symmetry Density Functional Theory (BS-DFT) Calculated Electron Paramagnetic Resonance (EPR) Parameters of the S2 State of the Oxygen-Evolving Complex of Photosystem II in Its Native (Calcium) and Strontium-Substituted Form. J Phys Chem B 2017; 121:11273-11283. [DOI: 10.1021/acs.jpcb.7b09498] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Nathan J. Beal
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Thomas A. Corry
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Patrick J. O’Malley
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
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164
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Melder J, Kwong WL, Shevela D, Messinger J, Kurz P. Electrocatalytic Water Oxidation by MnO x /C: In Situ Catalyst Formation, Carbon Substrate Variations, and Direct O 2 /CO 2 Monitoring by Membrane-Inlet Mass Spectrometry. CHEMSUSCHEM 2017; 10:4491-4502. [PMID: 28869720 DOI: 10.1002/cssc.201701383] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Revised: 08/14/2017] [Indexed: 06/07/2023]
Abstract
Layers of amorphous manganese oxides were directly formed on the surfaces of different carbon materials by exposing the carbon to aqueous solutions of permanganate (MnO4- ) followed by sintering at 100-400 °C. During electrochemical measurements in neutral aqueous buffer, nearly all of the MnOx /C electrodes show significant oxidation currents at potentials relevant for the oxygen evolution reaction (OER). However, by combining electrolysis with product detection by using mass spectrometry, it was found that these currents were only strictly linked to water oxidation if MnOx was deposited on graphitic carbon materials (faradaic O2 yields >90 %). On the contrary, supports containing sp3 -C were found to be unsuitable as the OER is accompanied by carbon corrosion to CO2 . Thus, choosing the "right" carbon material is crucial for the preparation of stable and efficient MnOx /C anodes for water oxidation catalysis. For MnOx on graphitic substrates, current densities of >1 mA cm-2 at η=540 mV could be maintained for at least 16 h of continuous operation at pH 7 (very good values for electrodes containing only abundant elements such as C, O, and Mn) and post-operando measurements proved the integrity of both the catalyst coating and the underlying carbon at OER conditions.
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Affiliation(s)
- Jens Melder
- Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg, Germany
| | - Wai Ling Kwong
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala Universitet, Lägerhyddsvägen 1, 75120, Uppsala, Sweden
- Department of Chemistry, Kemiskt Biologiskt Centrum (KBC), Umeå Universitet, Linnaeusväg 6, 90187, Umeå, Sweden
| | - Dmitriy Shevela
- Department of Chemistry, Kemiskt Biologiskt Centrum (KBC), Umeå Universitet, Linnaeusväg 6, 90187, Umeå, Sweden
| | - Johannes Messinger
- Molecular Biomimetics, Department of Chemistry, Ångström Laboratory, Uppsala Universitet, Lägerhyddsvägen 1, 75120, Uppsala, Sweden
- Department of Chemistry, Kemiskt Biologiskt Centrum (KBC), Umeå Universitet, Linnaeusväg 6, 90187, Umeå, Sweden
| | - Philipp Kurz
- Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF), Albert-Ludwigs-Universität Freiburg, Albertstraße 21, 79104, Freiburg, Germany
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165
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Morton J, Chrysina M, Craig VSJ, Akita F, Nakajima Y, Lubitz W, Cox N, Shen JR, Krausz E. Structured near-infrared Magnetic Circular Dichroism spectra of the Mn 4CaO 5 cluster of PSII in T. vulcanus are dominated by Mn(IV) d-d 'spin-flip' transitions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1859:88-98. [PMID: 29066392 DOI: 10.1016/j.bbabio.2017.10.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 10/17/2017] [Accepted: 10/19/2017] [Indexed: 01/13/2023]
Abstract
Photosystem II passes through four metastable S-states in catalysing light-driven water oxidation. Variable temperature variable field (VTVH) Magnetic Circular Dichroism (MCD) spectra in PSII of Thermosynochococcus (T.) vulcanus for each S-state are reported. These spectra, along with assignments, provide a new window into the electronic and magnetic structure of Mn4CaO5. VTVH MCD spectra taken in the S2 state provide a clear g=2, S=1/2 paramagnetic characteristic, which is entirely consistent with that known by EPR. The three features, seen as positive (+) at 749nm, negative (-) at 773nm and (+) at 808nm are assigned as 4A→2E spin-flips within the d3 configuration of the Mn(IV) centres present. This assignment is supported by comparison(s) to spin-flips seen in a range of Mn(IV) materials. S3 exhibits a more intense (-) MCD peak at 764nm and has a stronger MCD saturation characteristic. This S3 MCD saturation behaviour can be accurately modelled using parameters taken directly from analyses of EPR spectra. We see no evidence for Mn(III) d-d absorption in the near-IR of any S-state. We suggest that Mn(IV)-based absorption may be responsible for the well-known near-IR induced changes induced in S2 EPR spectra of T. vulcanus and not Mn(III)-based, as has been commonly assumed. Through an analysis of the nephelauxetic effect, the excitation energy of S-state dependent spin-flips seen may help identify coordination characteristics and changes at each Mn(IV). A prospectus as to what more detailed S-state dependent MCD studies promise to achieve is outlined.
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Affiliation(s)
- Jennifer Morton
- Research School of Chemistry, Australian National University, Canberra, Australia
| | - Maria Chrysina
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Vincent S J Craig
- Research School of Chemistry, Australian National University, Canberra, Australia
| | - Fusamichi Akita
- Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Department of Biology, Faculty of Science, Okayama University, Okayama, Japan; Japan Science and Technology Agency, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Yoshiki Nakajima
- Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Department of Biology, Faculty of Science, Okayama University, Okayama, Japan
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Nicholas Cox
- Research School of Chemistry, Australian National University, Canberra, Australia; Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Jian-Ren Shen
- Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Department of Biology, Faculty of Science, Okayama University, Okayama, Japan
| | - Elmars Krausz
- Research School of Chemistry, Australian National University, Canberra, Australia.
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166
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Lohmiller T, Krewald V, Sedoud A, Rutherford AW, Neese F, Lubitz W, Pantazis DA, Cox N. The First State in the Catalytic Cycle of the Water-Oxidizing Enzyme: Identification of a Water-Derived μ-Hydroxo Bridge. J Am Chem Soc 2017; 139:14412-14424. [DOI: 10.1021/jacs.7b05263] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Thomas Lohmiller
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Vera Krewald
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Arezki Sedoud
- Department
of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
- iBiTec-S, URA
CNRS 2096, CEA Saclay, 91191 Gif-sur-Yvette, France
| | - A. William Rutherford
- Department
of Life Sciences, Imperial College London, London SW7 2AZ, United Kingdom
- iBiTec-S, URA
CNRS 2096, CEA Saclay, 91191 Gif-sur-Yvette, France
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Dimitrios A. Pantazis
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Nicholas Cox
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
- Research
School of Chemistry, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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167
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Anderton KJ, Ermert DM, Quintero PA, Turvey MW, Fataftah MS, Abboud KA, Meisel MW, Čižmár E, Murray LJ. Correlating Bridging Ligand with Properties of Ligand-Templated [Mn II3X 3] 3+ Clusters (X = Br -, Cl -, H -, MeO -). Inorg Chem 2017; 56:12012-12022. [PMID: 28920698 DOI: 10.1021/acs.inorgchem.7b02004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Polynuclear manganese compounds have garnered interest as mimics and models of the water oxidizing complex (WOC) in photosystem II and as single molecule magnets. Molecular systems in which composition can be correlated to physical phenomena, such as magnetic exchange interactions, remain few primarily because of synthetic limitations. Here, we report the synthesis of a family of trimanganese(II) complexes of the type Mn3X3L (X = Cl-, H-, and MeO-) where L3- is a tris(β-diketiminate) cyclophane. The tri(chloride) complex (2) is structurally similar to the reported tri(bromide) complex (1) with the Mn3X3 core having a ladder-like arrangement of alternating M-X rungs, whereas the tri(μ-hydride) (3) and tri(μ-methoxide) (4) complexes contain planar hexagonal cores. The hydride and methoxide complexes are synthesized in good yield (48% and 56%) starting with the bromide complex employing a metathesis-like strategy. Compounds 2-4 were characterized by combustion analysis, X-ray crystallography, X-band EPR spectroscopy, SQUID magnetometry, and infrared and UV-visible spectroscopy. Magnetic susceptibility measurements indicate that the Mn3 clusters in 2-4 are antiferromagnetically coupled, and the spin ground state of the compounds (S = 3/2 (1, 2) or S = 1/2 (3, 4)) is correlated to the identity of the bridging ligand and structural arrangement of the Mn3X3 core (X = Br, Cl, H, OCH3). Electrochemical experiments on isobutyronitrile solutions of 3 and 4 display broad irreversible oxidations centered at 0.30 V.
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Affiliation(s)
- Kevin J Anderton
- Department of Chemistry, Center for Catalysis and Center for Heterocyclic Compounds, University of Florida , Gainesville, Florida 32611, United States
| | - David M Ermert
- Department of Chemistry, Center for Catalysis and Center for Heterocyclic Compounds, University of Florida , Gainesville, Florida 32611, United States
| | - Pedro A Quintero
- Department of Physics and the National High Magnetic Field Laboratory, University of Florida , Gainesville, Florida 32611, United States
| | - Mackenzie W Turvey
- Department of Physics and the National High Magnetic Field Laboratory, University of Florida , Gainesville, Florida 32611, United States
| | - Majed S Fataftah
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Khalil A Abboud
- Department of Chemistry, Center for Catalysis and Center for Heterocyclic Compounds, University of Florida , Gainesville, Florida 32611, United States
| | - Mark W Meisel
- Department of Physics and the National High Magnetic Field Laboratory, University of Florida , Gainesville, Florida 32611, United States
| | - Erik Čižmár
- Institute of Physics, Faculty of Science, Pavol Jozef Šafárik University , 04154 Košice, Slovakia
| | - Leslie J Murray
- Department of Chemistry, Center for Catalysis and Center for Heterocyclic Compounds, University of Florida , Gainesville, Florida 32611, United States
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168
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Guo Y, Li H, He LL, Zhao DX, Gong LD, Yang ZZ. Theoretical reflections on the structural polymorphism of the oxygen-evolving complex in the S2 state and the correlations to substrate water exchange and water oxidation mechanism in photosynthesis. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:833-846. [DOI: 10.1016/j.bbabio.2017.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 06/25/2017] [Accepted: 08/02/2017] [Indexed: 11/29/2022]
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169
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Retegan M, Pantazis DA. Differences in the Active Site of Water Oxidation among Photosynthetic Organisms. J Am Chem Soc 2017; 139:14340-14343. [PMID: 28948784 DOI: 10.1021/jacs.7b06351] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The site of biological water oxidation is highly conserved across photosynthetic organisms, but differences of unidentified structural and electronic origin exist between taxonomically discrete clades, revealed by distinct spectroscopic signatures of the oxygen-evolving Mn4CaO5 cluster and variations in active-site accessibility. Comparison of atomistic models of a native cyanobacterial form (Thermosynechococcus vulcanus) and a chimeric spinach-like form of photosystem II allows us to identify the precise atomic-level differences between organisms in the vicinity of the manganese cluster. Substitution of cyanobacterial D1-Asn87 by higher-plant D1-Ala87 is the principal discriminating feature: it drastically rearranges a network of proximal hydrogen bonds, modifying the local architecture of a water channel and the interaction of second coordination shell residues with the manganese cluster. The two variants explain species-dependent differences in spectroscopic properties and in the interaction of substrate analogues with the oxygen-evolving complex, enabling assignment of a substrate delivery channel to the active site.
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Affiliation(s)
- Marius Retegan
- European Synchrotron Radiation Facility , 71 Avenue des Martyrs, 38000 Grenoble, France
| | - Dimitrios A Pantazis
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36, 45470 Mülheim an der Ruhr, Germany
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170
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Petrie S, Stranger R, Pace RJ. Rationalizing the 2.25 Å Resolution Crystal Structure of the Water Oxidising Complex of Photosystem II in the S3State. Chemphyschem 2017; 18:2924-2931. [DOI: 10.1002/cphc.201700640] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Indexed: 12/14/2022]
Affiliation(s)
- Simon Petrie
- Research School of Chemistry, College of Physical and Mathematical Sciences; The Australian National University; Acton ACT 2601 Australia
| | - Rob Stranger
- Research School of Chemistry, College of Physical and Mathematical Sciences; The Australian National University; Acton ACT 2601 Australia
| | - Ron J. Pace
- Research School of Chemistry, College of Physical and Mathematical Sciences; The Australian National University; Acton ACT 2601 Australia
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171
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Alaimo AA, Koumousi ES, Cunha-Silva L, McCormick LJ, Teat SJ, Psycharis V, Raptopoulou CP, Mukherjee S, Li C, Gupta SD, Escuer A, Christou G, Stamatatos TC. Structural Diversities in Heterometallic Mn–Ca Cluster Chemistry from the Use of Salicylhydroxamic Acid: {MnIII4Ca2}, {MnII/III6Ca2}, {MnIII/IV8Ca}, and {MnIII8Ca2} Complexes with Relevance to Both High- and Low-Valent States of the Oxygen-Evolving Complex. Inorg Chem 2017; 56:10760-10774. [DOI: 10.1021/acs.inorgchem.7b01740] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alysha A. Alaimo
- Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, L2S 3A1 St. Catharines, Ontario, Canada
| | | | - Luís Cunha-Silva
- REQUIMTE-LAQV & Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, 4169-007 Porto, Portugal
| | - Laura J. McCormick
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Simon J. Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States
| | - Vassilis Psycharis
- Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, 15310 Agia Paraskevi, Attikis, Greece
| | - Catherine P. Raptopoulou
- Institute of Nanoscience and Nanotechnology, NCSR “Demokritos”, 15310 Agia Paraskevi, Attikis, Greece
| | - Shreya Mukherjee
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Chaoran Li
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Sayak Das Gupta
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Albert Escuer
- Departament
de Quimica Inorganica and Institut de Nanociencia i Nanotecnologia
(IN2UB), Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Theocharis C. Stamatatos
- Department of Chemistry, Brock University, 1812 Sir Isaac Brock Way, L2S 3A1 St. Catharines, Ontario, Canada
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172
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Rossini E, Knapp EW. Protonation equilibria of transition metal complexes: From model systems toward the Mn-complex in photosystem II. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.02.017] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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173
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Nakamura S, Noguchi T. Infrared Determination of the Protonation State of a Key Histidine Residue in the Photosynthetic Water Oxidizing Center. J Am Chem Soc 2017. [DOI: 10.1021/jacs.7b04924] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Shin Nakamura
- Division of Material Science,
Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Takumi Noguchi
- Division of Material Science,
Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
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174
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Nguyen AI, Wang J, Levine DS, Ziegler MS, Tilley TD. Synthetic control and empirical prediction of redox potentials for Co 4O 4 cubanes over a 1.4 V range: implications for catalyst design and evaluation of high-valent intermediates in water oxidation. Chem Sci 2017; 8:4274-4284. [PMID: 29081963 PMCID: PMC5635813 DOI: 10.1039/c7sc00627f] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2017] [Accepted: 04/03/2017] [Indexed: 01/12/2023] Open
Abstract
The oxo-cobalt cubane unit [Co4O4] is of interest as a homogeneous oxygen-evolution reaction (OER) catalyst, and as a functional mimic of heterogeneous cobalt oxide OER catalysts. The synthesis of several new cubanes allows evaluation of redox potentials for the [Co4O4] cluster, which are highly sensitive to the ligand environment and span a remarkable range of 1.42 V. The [CoIII4O4]4+/[CoIII3CoIVO4]5+ and [CoIII3CoIVO4]5+/[CoIII2CoIV2O4]6+ redox potentials are reliably predicted by the pKas of the ligands. Hydrogen bonding is also shown to significantly raise the redox potentials, by ∼500 mV. The potential-pKa correlation is used to evaluate the feasibility of various proposed OER catalytic intermediates, including high-valent Co-oxo species. The synthetic methods and structure-reactivity relationships developed by these studies should better guide the design of new cubane-based OER catalysts.
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Affiliation(s)
- Andy I Nguyen
- Department of Chemistry , University of California , Berkeley , California 94720-1460 , USA .
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - Jianing Wang
- Department of Chemistry , University of California , Berkeley , California 94720-1460 , USA .
| | - Daniel S Levine
- Department of Chemistry , University of California , Berkeley , California 94720-1460 , USA .
| | - Micah S Ziegler
- Department of Chemistry , University of California , Berkeley , California 94720-1460 , USA .
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
| | - T Don Tilley
- Department of Chemistry , University of California , Berkeley , California 94720-1460 , USA .
- Chemical Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , USA
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175
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Bose S, Debgupta J, Ramsundar RM, Das SK. Electrochemical Water Oxidation Catalyzed by an In Situ Generated α-Co(OH)2
Film on Zeolite-Y Surface. Chemistry 2017; 23:8051-8057. [DOI: 10.1002/chem.201700955] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Suranjana Bose
- School of Chemistry; University of Hyderabad, P.O. Central University; Hyderabad 500046 India
| | - Joyashish Debgupta
- School of Chemistry; University of Hyderabad, P.O. Central University; Hyderabad 500046 India
| | - Rani M. Ramsundar
- Physical and Materials Chemistry Division; CSIR-National Chemical Laboratory; Pune 411008 India
| | - Samar K. Das
- School of Chemistry; University of Hyderabad, P.O. Central University; Hyderabad 500046 India
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176
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Kim CJ, Debus RJ. 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 Cluster. Biochemistry 2017; 56:2558-2570. [DOI: 10.1021/acs.biochem.6b01278] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Christopher J. Kim
- Department of Biochemistry, University of California, Riverside, California 92521, United States
| | - Richard J. Debus
- Department of Biochemistry, University of California, Riverside, California 92521, United States
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177
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Vinyard DJ, Brudvig GW. Progress Toward a Molecular Mechanism of Water Oxidation in Photosystem II. Annu Rev Phys Chem 2017; 68:101-116. [DOI: 10.1146/annurev-physchem-052516-044820] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- David J. Vinyard
- Department of Biological Sciences, Louisiana State University, Baton Rouge, Louisiana 70803
| | - Gary W. Brudvig
- Department of Chemistry, Yale University, New Haven, Connecticut 06520
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178
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Narzi D, Mattioli G, Bovi D, Guidoni L. A Spotlight on the Compatibility between XFEL and Ab Initio Structures of the Oxygen Evolving Complex in Photosystem II. Chemistry 2017; 23:6969-6973. [DOI: 10.1002/chem.201700722] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Indexed: 01/28/2023]
Affiliation(s)
- Daniele Narzi
- Institute of Chemical Sciences and Engineering; École polytechnique fédérale de Lausanne; Av. F.-A. Forel 2 1015 Lausanne Switzerland
| | | | - Daniele Bovi
- Pangea Formazione s.r.l.; via Gaspare Gozzi, 55 00145 Rome Italy
- Dipartimento di Scienze Fisiche e Chimiche; Università degli studi dell'Aquila; Via Vetoio (Coppito) 67100 L'Aquila Italy
| | - Leonardo Guidoni
- Dipartimento di Scienze Fisiche e Chimiche; Università degli studi dell'Aquila; Via Vetoio (Coppito) 67100 L'Aquila Italy
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179
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Paul S, Cox N, Pantazis DA. What Can We Learn from a Biomimetic Model of Nature’s Oxygen-Evolving Complex? Inorg Chem 2017; 56:3875-3888. [DOI: 10.1021/acs.inorgchem.6b02777] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Satadal Paul
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Germany
| | - Nicholas Cox
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Germany
- Research School of Chemistry, Australian National University, Canberra ACT 2601, Australia
| | - Dimitrios A. Pantazis
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34−36, 45470 Mülheim an der Ruhr, Germany
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180
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Yamaguchi K, Shoji M, Isobe H, Yamanaka S, Umena Y, Kawakami K, Kamiya N. On the guiding principles for understanding of geometrical structures of the CaMn4O5 cluster in oxygen-evolving complex of photosystem II. Proposal of estimation formula of structural deformations via the Jahn–Teller effects. Mol Phys 2017. [DOI: 10.1080/00268976.2016.1278476] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- K. Yamaguchi
- Institute for Nanoscience Design, Osaka University, Toyonaka, Japan
- Handairigaku Techno-Research , Toyonaka, Japan
| | - M. Shoji
- Center of Computational Sciences, Tsukuba University , Tsukuba, Japan
| | - H. Isobe
- Graduate School of Natural Science and Technology, Okayama University , Okayama, Japan
| | - S. Yamanaka
- Graduate School of Science, Osaka University , Osaka, Japan
| | - Y. Umena
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA), Osaka City University , Osaka, Japan
| | - K. Kawakami
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA), Osaka City University , Osaka, Japan
| | - N. Kamiya
- The OUC Advanced Research Institute for Natural Science and Technology (OCARNA), Osaka City University , Osaka, Japan
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181
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Najafpour MM, Heidari S, Balaghi SE, Hołyńska M, Sadr MH, Soltani B, Khatamian M, Larkum AW, Allakhverdiev SI. Proposed mechanisms for water oxidation by Photosystem II and nanosized manganese oxides. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1858:156-174. [DOI: 10.1016/j.bbabio.2016.11.007] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/05/2016] [Accepted: 11/08/2016] [Indexed: 12/18/2022]
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182
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Isobe H. Functional significance of the “distorted chair” topology of the Mn cluster for oxygen evolution in photosynthesis. ACTA ACUST UNITED AC 2017. [DOI: 10.4019/bjscc.70.2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
- Hiroshi Isobe
- Research Institute for Interdisciplinary Science, Okayama University
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183
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Shoji M, Isobe H, Nakajima T, Shigeta Y, Suga M, Akita F, Shen JR, Yamaguchi K. Large-scale QM/MM calculations of the CaMn4O5 cluster in the S3 state of the oxygen evolving complex of photosystem II. Comparison between water-inserted and no water-inserted structures. Faraday Discuss 2017; 198:83-106. [DOI: 10.1039/c6fd00230g] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Large-scale QM/MM calculations were performed to elucidate an optimized geometrical structure of a CaMn4O5 cluster with and without water insertion in the S3 state of the oxygen evolving complex (OEC) of photosystem II (PSII). The left (L)-opened structure was found to be stable under the assumption of no hydroxide anion insertion in the S3 state, whereas the right (R)-opened structure became more stable if one water molecule is inserted to the Mn4Ca cluster. The optimized Mna(4)–Mnd(1) distance determined by QM/MM was about 5.0 Å for the S3 structure without an inserted hydroxide anion, but this is elongated by 0.2–0.3 Å after insertion. These computational results are discussed in relation to the possible mechanisms of O–O bond formation in water oxidation by the OEC of PSII.
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Affiliation(s)
- Mitsuo Shoji
- Center for Computational Sciences
- University of Tsukuba
- Tsukuba
- Japan
- Graduate School of Pure and Applied Sciences
| | - Hiroshi Isobe
- Research Institute for Interdisciplinary Science
- Graduate School of Natural Science and Technology
- Okayama University
- Okayama
- Japan
| | | | - Yasuteru Shigeta
- Center for Computational Sciences
- University of Tsukuba
- Tsukuba
- Japan
- Graduate School of Pure and Applied Sciences
| | - Michihiro Suga
- Research Institute for Interdisciplinary Science
- Graduate School of Natural Science and Technology
- Okayama University
- Okayama
- Japan
| | - Fusamichi Akita
- Research Institute for Interdisciplinary Science
- Graduate School of Natural Science and Technology
- Okayama University
- Okayama
- Japan
| | - Jian-Ren Shen
- Research Institute for Interdisciplinary Science
- Graduate School of Natural Science and Technology
- Okayama University
- Okayama
- Japan
| | - Kizashi Yamaguchi
- Riken Advanced Institute for Computational Science
- Kobe
- Japan
- Institute for NanoScience Design
- Osaka University
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184
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Guo Y, Li H, He LL, Zhao DX, Gong LD, Yang ZZ. The open-cubane oxo–oxyl coupling mechanism dominates photosynthetic oxygen evolution: a comprehensive DFT investigation on O–O bond formation in the S4state. Phys Chem Chem Phys 2017; 19:13909-13923. [DOI: 10.1039/c7cp01617d] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
How is O2created in nature? Comprehensive DFT investigations determine the dominance of the open-cubane oxo–oxyl coupling mechanism over alternative possibilities.
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Affiliation(s)
- Yu Guo
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- People's Republic of China
| | - Hui Li
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- People's Republic of China
| | - Lan-Lan He
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- People's Republic of China
| | - Dong-Xia Zhao
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- People's Republic of China
| | - Li-Dong Gong
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- People's Republic of China
| | - Zhong-Zhi Yang
- School of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian 116029
- People's Republic of China
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185
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Sequential and Coupled Proton and Electron Transfer Events in the S2 → S3 Transition of Photosynthetic Water Oxidation Revealed by Time-Resolved X-ray Absorption Spectroscopy. Biochemistry 2016; 55:6996-7004. [DOI: 10.1021/acs.biochem.6b01078] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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186
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Zahariou G, Ioannidis N. Theoretical study of the EPR spectrum of the S 3TyrZ • metalloradical intermediate state of the O 2-evolving complex of photosystem II. PHOTOSYNTHESIS RESEARCH 2016; 130:417-426. [PMID: 27166961 DOI: 10.1007/s11120-016-0274-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 05/03/2016] [Indexed: 05/21/2023]
Abstract
The intermediates trapped during the transitions between the consecutive S-states of the oxygen-evolving complex (OEC) of photosystem II (PSII) contain the free radical TyrZ• interacting magnetically with the Mn-cluster (Mn4Ca). In this paper, we present a theoretical study of the EPR spectrum of the S3TyrZ• metalloradical intermediate state, which has been recently detected in MeOH-containing PSII preparations. For this analysis, we use two different approximations: the first, simpler one, is the point-dipole approach, where the two interacting spins are the S = 1/2 of TyrZ• and the ground spin state of S = 3 of the OEC being in the S3 state. The second approximation is based on previous proposals indicating that the ground spin state (S G = 3) of the S3 state arises from an antiferromagnetic exchange coupling between the S = 9/2 of the Mn(IV)3CaO4 and the S = 3/2 of the external Mn(IV) of the OEC. Under the above assumption, the second approximation involves three interacting spins, denoted S A(Mn(IV)3Ca) = 9/2, S B(Mn(IV)) = 3/2 and S C(TyrZ•) = 1/2. Accordingly, the tyrosine radical is exposed to dipolar interactions with both fragments of the OEC, while an antiferromagnetic exchange coupling within the "3 + 1" structural motif of the OEC is also considered. By application of the first-point-dipole approach, the inter-spin distance that simulates the experimental spectrum is not consistent with the theoretical models that were recently reported for the OEC in the S3 state. Instead, the recent models are consistent with the results of the analysis that is performed by using the second, more detailed, approach.
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Affiliation(s)
- Georgia Zahariou
- Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", 15310, Athens, Greece.
| | - Nikolaos Ioannidis
- Institute of Nanoscience & Nanotechnology, NCSR "Demokritos", 15310, Athens, Greece
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187
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Xu P, Zhou T, Intan NN, Hu S, Zheng X. Rational Ligand Design for an Efficient Biomimetic Water Splitting Complex. J Phys Chem A 2016; 120:10033-10042. [DOI: 10.1021/acs.jpca.6b10154] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Penglin Xu
- Hefei National Laboratory for Physical Sciences at the Microscale & Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Ting Zhou
- Hefei National Laboratory for Physical Sciences at the Microscale & Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Nadia N. Intan
- Hefei National Laboratory for Physical Sciences at the Microscale & Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Shaojin Hu
- Hefei National Laboratory for Physical Sciences at the Microscale & Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
| | - Xiao Zheng
- Hefei National Laboratory for Physical Sciences at the Microscale & Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China
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188
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Nakamura S, Noguchi T. Quantum mechanics/molecular mechanics simulation of the ligand vibrations of the water-oxidizing Mn 4CaO 5 cluster in photosystem II. Proc Natl Acad Sci U S A 2016; 113:12727-12732. [PMID: 27729534 PMCID: PMC5111704 DOI: 10.1073/pnas.1607897113] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
During photosynthesis, the light-driven oxidation of water performed by photosystem II (PSII) provides electrons necessary to fix CO2, in turn supporting life on Earth by liberating molecular oxygen. Recent high-resolution X-ray images of PSII show that the water-oxidizing center (WOC) is composed of an Mn4CaO5 cluster with six carboxylate, one imidazole, and four water ligands. FTIR difference spectroscopy has shown significant structural changes of the WOC during the S-state cycle of water oxidation, especially within carboxylate groups. However, the roles that these carboxylate groups play in water oxidation as well as how they should be properly assigned in spectra are unresolved. In this study, we performed a normal mode analysis of the WOC using the quantum mechanics/molecular mechanics (QM/MM) method to simulate FTIR difference spectra on the S1 to S2 transition in the carboxylate stretching region. By evaluating WOC models with different oxidation and protonation states, we determined that models of high-oxidation states, Mn(III)2Mn(IV)2, satisfactorily reproduced experimental spectra from intact and Ca-depleted PSII compared with low-oxidation models. It is further suggested that the carboxylate groups bridging Ca and Mn ions within this center tune the reactivity of water ligands bound to Ca by shifting charge via their π conjugation.
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Affiliation(s)
- Shin Nakamura
- Division of Material Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
| | - Takumi Noguchi
- Division of Material Science, Graduate School of Science, Nagoya University, Nagoya 464-8602, Japan
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189
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Vollmers NJ, Müller P, Hoffmann A, Herres-Pawlis S, Rohrmüller M, Schmidt WG, Gerstmann U, Bauer M. Experimental and Theoretical High-Energy-Resolution X-ray Absorption Spectroscopy: Implications for the Investigation of the Entatic State. Inorg Chem 2016; 55:11694-11706. [DOI: 10.1021/acs.inorgchem.6b01704] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
| | | | - Alexander Hoffmann
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, D-52074 Aachen, Germany
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190
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Geng Z, Wang Y, Liu J, Li G, Li L, Huang K, Yuan L, Feng S. δ-MnO 2-Mn 3O 4 Nanocomposite for Photochemical Water Oxidation: Active Structure Stabilized in the Interface. ACS APPLIED MATERIALS & INTERFACES 2016; 8:27825-27831. [PMID: 27684967 DOI: 10.1021/acsami.6b09984] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Pure phase manganese oxides have been widely studied as water oxidation catalysts, but further improvement of their activities is much challenging. Herein, we report an effective method to improve the water oxidation activity by fabricating a nanocomposite of Mn3O4 and δ-MnO2 with an active interface. The nanocomposite was achieved by a partial reduction approach which induced an in situ growth of Mn3O4 nanoparticles from the surface of δ-MnO2 nanosheets. The optimum composition was determined to be 38% Mn3O4 and 62% δ-MnO2 as confirmed by X-ray photoelectron spectra (XPS) and X-ray absorption spectra (XAS). The δ-MnO2-Mn3O4 nanocomposite is a highly active water oxidation catalyst with a turnover frequency (TOF) of 0.93 s-1, which is much higher than the individual components of δ-MnO2 and Mn3O4. We consider that the enhanced water oxidation activity could be explained by the active interface between two components. At the phase interface, weak Mn-O bonds are introduced by lattice disorder in the transition of hausmannite phase to birnessite phase, which provides active sites for water oxidation catalysis. Our study illustrates a new view to improve water oxidation activity of manganese oxides.
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Affiliation(s)
- Zhibin Geng
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Yanxiang Wang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Jinghai Liu
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
- Inner Mongolia Key Lab of Chemistry of Natural Products and Synthesis of Functional Molecules, College of Chemistry and Chemical Engineering, Inner Mongolia University for the Nationalities (IMUN) , Tongliao 028000, People's Republic of China
| | - Guangshe Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Liping Li
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Keke Huang
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Long Yuan
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
| | - Shouhua Feng
- State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , Changchun 130012, People's Republic of China
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191
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Chernev P, Zaharieva I, Rossini E, Galstyan A, Dau H, Knapp EW. Merging Structural Information from X-ray Crystallography, Quantum Chemistry, and EXAFS Spectra: The Oxygen-Evolving Complex in PSII. J Phys Chem B 2016; 120:10899-10922. [DOI: 10.1021/acs.jpcb.6b05800] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Petko Chernev
- Institute of Chemistry and Biochemistry and ‡Department of Physics, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Ivelina Zaharieva
- Institute of Chemistry and Biochemistry and ‡Department of Physics, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Emanuele Rossini
- Institute of Chemistry and Biochemistry and ‡Department of Physics, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Artur Galstyan
- Institute of Chemistry and Biochemistry and ‡Department of Physics, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Holger Dau
- Institute of Chemistry and Biochemistry and ‡Department of Physics, Freie Universität Berlin, D-14195 Berlin, Germany
| | - Ernst-Walter Knapp
- Institute of Chemistry and Biochemistry and ‡Department of Physics, Freie Universität Berlin, D-14195 Berlin, Germany
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192
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Bicarbonate-induced redox tuning in Photosystem II for regulation and protection. Proc Natl Acad Sci U S A 2016; 113:12144-12149. [PMID: 27791001 DOI: 10.1073/pnas.1608862113] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The midpoint potential (Em) of [Formula: see text], the one-electron acceptor quinone of Photosystem II (PSII), provides the thermodynamic reference for calibrating PSII bioenergetics. Uncertainty exists in the literature, with two values differing by ∼80 mV. Here, we have resolved this discrepancy by using spectroelectrochemistry on plant PSII-enriched membranes. Removal of bicarbonate (HCO3-) shifts the Em from ∼-145 mV to -70 mV. The higher values reported earlier are attributed to the loss of HCO3- during the titrations (pH 6.5, stirred under argon gassing). These findings mean that HCO3- binds less strongly when QA-• is present. Light-induced QA-• formation triggered HCO3- loss as manifest by the slowed electron transfer and the upshift in the Em of QA HCO3--depleted PSII also showed diminished light-induced 1O2 formation. This finding is consistent with a model in which the increase in the Em of [Formula: see text] promotes safe, direct [Formula: see text] charge recombination at the expense of the damaging back-reaction route that involves chlorophyll triplet-mediated 1O2 formation [Johnson GN, et al. (1995) Biochim Biophys Acta 1229:202-207]. These findings provide a redox tuning mechanism, in which the interdependence of the redox state of QA and the binding by HCO3- regulates and protects PSII. The potential for a sink (CO2) to source (PSII) feedback mechanism is discussed.
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193
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Zaltariov MF, Cazacu M, Sacarescu L, Vlad A, Novitchi G, Train C, Shova S, Arion VB. Oxime-Bridged Mn6 Clusters Inserted in One-Dimensional Coordination Polymer. Macromolecules 2016. [DOI: 10.1021/acs.macromol.6b01149] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Maria Cazacu
- “Petru
Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Liviu Sacarescu
- “Petru
Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Angelica Vlad
- “Petru
Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Ghenadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses, CNRSUPR 3228, Univ. Grenoble-Alpes, 25 Rue
des Martyrs, 38042 Grenoble, France
| | - Cyrille Train
- Laboratoire National des Champs Magnétiques Intenses, CNRSUPR 3228, Univ. Grenoble-Alpes, 25 Rue
des Martyrs, 38042 Grenoble, France
| | - Sergiu Shova
- “Petru
Poni” Institute of Macromolecular Chemistry, Aleea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Vladimir B. Arion
- Institute of Inorganic Chemistry, University of Vienna, Währinger Str. 42, 1090 Vienna, Austria
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194
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Vinyard DJ, Khan S, Brudvig GW. Photosynthetic water oxidation: binding and activation of substrate waters for O-O bond formation. Faraday Discuss 2016; 185:37-50. [PMID: 26447686 DOI: 10.1039/c5fd00087d] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Photosynthetic water oxidation occurs at the oxygen-evolving complex (OEC) of Photosystem II (PSII). The OEC, which contains a Mn4CaO5 inorganic cluster ligated by oxides, waters and amino-acid residues, cycles through five redox intermediates known as S(i) states (i = 0-4). The electronic and structural properties of the transient S4 intermediate that forms the O-O bond are not well understood. In order to gain insight into how water is activated for O-O bond formation in the S4 intermediate, we have performed a detailed analysis of S-state dependent substrate water binding kinetics taking into consideration data from Mn coordination complexes. This analysis supports a model in which the substrate waters are both bound as terminal ligands and react via a water-nucleophile attack mechanism.
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Affiliation(s)
- David J Vinyard
- Department of Chemistry, Yale University, New Haven, CT, United States.
| | - Sahr Khan
- Department of Chemistry, Yale University, New Haven, CT, United States.
| | - Gary W Brudvig
- Department of Chemistry, Yale University, New Haven, CT, United States.
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195
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Chatterjee R, Han G, Kern J, Gul S, Fuller FD, Garachtchenko A, Young ID, Weng TC, Nordlund D, Alonso-Mori R, Bergmann U, Sokaras D, Hatakeyama M, Yachandra VK, Yano J. Structural Changes Correlated with Magnetic Spin State Isomorphism in the S 2 State of the Mn 4CaO 5 Cluster in the Oxygen-Evolving Complex of Photosystem II. Chem Sci 2016; 7:5236-5248. [PMID: 28044099 PMCID: PMC5201215 DOI: 10.1039/c6sc00512h] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 04/26/2016] [Indexed: 12/19/2022] Open
Abstract
The Mn4CaO5 cluster in Photosystem II catalyzes the four-electron redox reaction of water oxidation in natural photosynthesis. This catalytic reaction cycles through four intermediate states (Si, i = 0 to 4), involving changes in the redox state of the four Mn atoms in the cluster. Recent studies suggest the presence and importance of isomorphous structures within the same redox/intermediate S-state. It is highly likely that geometric and electronic structural flexibility play a role in the catalytic mechanism. Among the catalytic intermediates that have been identified experimentally thus far, there is clear evidence of such isomorphism in the S2 state, with a high-spin (5/2) (HS) and a low spin (1/2) (LS) form, identified and characterized by their distinct electron paramagnetic resonance (EPR spectroscopy) signals. We studied these two S2 isomers with Mn extended X-ray absorption fine structure (EXAFS) and absorption and emission spectroscopy (XANES/XES) to characterize the structural and electronic structural properties. The geometric and electronic structure of the HS and LS S2 states are different as determined using Mn EXAFS and XANES/XES, respectively. The Mn K-edge XANES and XES for the HS form are different from the LS and indicate a slightly lower positive charge on the Mn atoms compared to the LS form. Based on the EXAFS results which are clearly different, we propose possible structural differences between the two spin states. Such structural and magnetic redox-isomers if present at room temperature, will likely play a role in the mechanism for water-exchange/oxidation in photosynthesis.
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Affiliation(s)
- Ruchira Chatterjee
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
| | - Guangye Han
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
| | - Jan Kern
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
- LCLS
, SLAC National Accelerator Laboratory
,
Menlo Park
, CA
, USA
| | - Sheraz Gul
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
| | - Franklin D. Fuller
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
| | - Anna Garachtchenko
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
| | - Iris D. Young
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
| | - Tsu-Chien Weng
- Center for High Pressure Science &Technology Advanced Research
,
Shanghai
, China
| | - Dennis Nordlund
- SSRL
, SLAC National Accelerator Laboratory
,
Menlo Park
, CA
, USA
| | | | - Uwe Bergmann
- PULSE
, SLAC National Accelerator Laboratory
,
Menlo Park
, CA
, USA
| | | | | | - Vittal K. Yachandra
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
| | - Junko Yano
- Molecular Biophysics and Integrated Bioimaging Division
, Lawrence Berkeley National Laboratory
,
MS 66-0200, 1 Cyclotron Rd.
, Berkeley
, CA 94720-8099
, USA
.
;
; Tel: +1 510 486 4366
; Tel: +1 510 486 4963
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196
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Shoji M, Isobe H, Nakajima T, Yamaguchi K. Large-scale QM/MM calculations of the CaMn4O5 cluster in the oxygen-evolving complex of photosystem II: Comparisons with EXAFS structures. Chem Phys Lett 2016. [DOI: 10.1016/j.cplett.2016.06.067] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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197
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Siggel U, Schmitt FJ, Messinger J. Gernot Renger (1937-2013): his life, Max-Volmer Laboratory, and photosynthesis research. PHOTOSYNTHESIS RESEARCH 2016; 129:109-127. [PMID: 27312337 DOI: 10.1007/s11120-016-0280-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/02/2016] [Indexed: 06/06/2023]
Abstract
Gernot Renger (October 23, 1937-January 12, 2013), one of the leading biophysicists in the field of photosynthesis research, studied and worked at the Max-Volmer-Institute (MVI) of the Technische Universität Berlin, Germany, for more than 50 years, and thus witnessed the rise and decline of photosynthesis research at this institute, which at its prime was one of the leading centers in this field. We present a tribute to Gernot Renger's work and life in the context of the history of photosynthesis research of that period, with special focus on the MVI. Gernot will be remembered for his thought-provoking questions and his boundless enthusiasm for science.
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Affiliation(s)
- Ulrich Siggel
- Max-Volmer-Laboratorium, TU Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany.
| | - Franz-Josef Schmitt
- Max-Volmer-Laboratorium, TU Berlin, Strasse des 17. Juni 135, 10623, Berlin, Germany
| | - Johannes Messinger
- Departmant of Chemistry, Umeå University, Linnaeus väg 6 (KBC huset), 90187, Umeå, Sweden.
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198
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Zaharieva I, Chernev P, Berggren G, Anderlund M, Styring S, Dau H, Haumann M. Room-Temperature Energy-Sampling Kβ X-ray Emission Spectroscopy of the Mn4Ca Complex of Photosynthesis Reveals Three Manganese-Centered Oxidation Steps and Suggests a Coordination Change Prior to O2 Formation. Biochemistry 2016; 55:4197-211. [PMID: 27377097 DOI: 10.1021/acs.biochem.6b00491] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
In oxygenic photosynthesis, water is oxidized and dioxygen is produced at a Mn4Ca complex bound to the proteins of photosystem II (PSII). Valence and coordination changes in its catalytic S-state cycle are of great interest. In room-temperature (in situ) experiments, time-resolved energy-sampling X-ray emission spectroscopy of the Mn Kβ1,3 line after laser-flash excitation of PSII membrane particles was applied to characterize the redox transitions in the S-state cycle. The Kβ1,3 line energies suggest a high-valence configuration of the Mn4Ca complex with Mn(III)3Mn(IV) in S0, Mn(III)2Mn(IV)2 in S1, Mn(III)Mn(IV)3 in S2, and Mn(IV)4 in S3 and, thus, manganese oxidation in each of the three accessible oxidizing transitions of the water-oxidizing complex. There are no indications of formation of a ligand radical, thus rendering partial water oxidation before reaching the S4 state unlikely. The difference spectra of both manganese Kβ1,3 emission and K-edge X-ray absorption display different shapes for Mn(III) oxidation in the S2 → S3 transition when compared to Mn(III) oxidation in the S1 → S2 transition. Comparison to spectra of manganese compounds with known structures and oxidation states and varying metal coordination environments suggests a change in the manganese ligand environment in the S2 → S3 transition, which could be oxidation of five-coordinated Mn(III) to six-coordinated Mn(IV). Conceivable options for the rearrangement of (substrate) water species and metal-ligand bonding patterns at the Mn4Ca complex in the S2 → S3 transition are discussed.
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Affiliation(s)
- Ivelina Zaharieva
- Freie Universität Berlin , Department of Physics, 14195 Berlin, Germany
| | - Petko Chernev
- Freie Universität Berlin , Department of Physics, 14195 Berlin, Germany
| | - Gustav Berggren
- Uppsala University , Department of Chemistry, Ångström Laboratory, 75120 Uppsala, Sweden
| | - Magnus Anderlund
- Uppsala University , Department of Chemistry, Ångström Laboratory, 75120 Uppsala, Sweden
| | - Stenbjörn Styring
- Uppsala University , Department of Chemistry, Ångström Laboratory, 75120 Uppsala, Sweden
| | - Holger Dau
- Freie Universität Berlin , Department of Physics, 14195 Berlin, Germany
| | - Michael Haumann
- Freie Universität Berlin , Department of Physics, 14195 Berlin, Germany
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199
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Schrapers P, Mebs S, Goetzl S, Hennig SE, Dau H, Dobbek H, Haumann M. Axial Ligation and Redox Changes at the Cobalt Ion in Cobalamin Bound to Corrinoid Iron-Sulfur Protein (CoFeSP) or in Solution Characterized by XAS and DFT. PLoS One 2016; 11:e0158681. [PMID: 27384529 PMCID: PMC4934906 DOI: 10.1371/journal.pone.0158681] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 06/20/2016] [Indexed: 11/18/2022] Open
Abstract
A cobalamin (Cbl) cofactor in corrinoid iron-sulfur protein (CoFeSP) is the primary methyl group donor and acceptor in biological carbon oxide conversion along the reductive acetyl-CoA pathway. Changes of the axial coordination of the cobalt ion within the corrin macrocycle upon redox transitions in aqua-, methyl-, and cyano-Cbl bound to CoFeSP or in solution were studied using X-ray absorption spectroscopy (XAS) at the Co K-edge in combination with density functional theory (DFT) calculations, supported by metal content and cobalt redox level quantification with further spectroscopic methods. Calculation of the highly variable pre-edge X-ray absorption features due to core-to-valence (ctv) electronic transitions, XANES shape analysis, and cobalt-ligand bond lengths determination from EXAFS has yielded models for the molecular and electronic structures of the cobalt sites. This suggested the absence of a ligand at cobalt in CoFeSP in α-position where the dimethylbenzimidazole (dmb) base of the cofactor is bound in Cbl in solution. As main species, (dmb)CoIII(OH2), (dmb)CoII(OH2), and (dmb)CoIII(CH3) sites for solution Cbl and CoIII(OH2), CoII(OH2), and CoIII(CH3) sites in CoFeSP-Cbl were identified. Our data support binding of a serine residue from the reductive-activator protein (RACo) of CoFeSP to the cobalt ion in the CoFeSP-RACo protein complex that stabilizes Co(II). The absence of an α-ligand at cobalt not only tunes the redox potential of the cobalamin cofactor into the physiological range, but is also important for CoFeSP reactivation.
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Affiliation(s)
- Peer Schrapers
- Freie Universität Berlin, Department of Physics, 14195, Berlin, Germany
| | - Stefan Mebs
- Freie Universität Berlin, Department of Physics, 14195, Berlin, Germany
| | - Sebastian Goetzl
- Humboldt-Universität zu Berlin, Department of Biology, 10115, Berlin, Germany
| | - Sandra E. Hennig
- Humboldt-Universität zu Berlin, Department of Biology, 10115, Berlin, Germany
| | - Holger Dau
- Freie Universität Berlin, Department of Physics, 14195, Berlin, Germany
| | - Holger Dobbek
- Humboldt-Universität zu Berlin, Department of Biology, 10115, Berlin, Germany
| | - Michael Haumann
- Freie Universität Berlin, Department of Physics, 14195, Berlin, Germany
- * E-mail:
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Retegan M, Pantazis DA. Interaction of methanol with the oxygen-evolving complex: atomistic models, channel identification, species dependence, and mechanistic implications. Chem Sci 2016; 7:6463-6476. [PMID: 28451104 PMCID: PMC5355959 DOI: 10.1039/c6sc02340a] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2016] [Accepted: 06/28/2016] [Indexed: 12/29/2022] Open
Abstract
Methanol has long being used as a substrate analogue to probe access pathways and investigate water delivery at the oxygen-evolving complex (OEC) of photosystem-II. In this contribution we study the interaction of methanol with the OEC by assembling available spectroscopic data into a quantum mechanical treatment that takes into account the local channel architecture of the active site. The effect on the magnetic energy levels of the Mn4Ca cluster in the S2 state of the catalytic cycle can be explained equally well by two models that involve either methanol binding to the calcium ion of the cluster, or a second-sphere interaction in the vicinity of the "dangler" Mn4 ion. However, consideration of the latest 13C hyperfine interaction data shows that only one model is fully consistent with experiment. In contrast to previous hypotheses, methanol is not a direct ligand to the OEC, but is situated at the end-point of a water channel associated with the O4 bridge. Its effect on magnetic properties of plant PS-II results from disruption of hydrogen bonding between O4 and proximal channel water molecules, thus enhancing superexchange (antiferromagnetic coupling) between the Mn3 and Mn4 ions. The same interaction mode applies to the dark-stable S1 state and possibly to all other states of the complex. Comparison of protein sequences from cyanobacteria and plants reveals a channel-altering substitution (D1-Asn87 versus D1-Ala87) in the proximity of the methanol binding pocket, explaining the species-dependence of the methanol effect. The water channel established as the methanol access pathway is the same that delivers ammonia to the Mn4 ion, supporting the notion that this is the only directly solvent-accessible manganese site of the OEC. The results support the pivot mechanism for water binding at a component of the S3 state and would be consistent with partial inhibition of water delivery by methanol. Mechanistic implications for enzymatic regulation and catalytic progression are discussed.
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Affiliation(s)
- Marius Retegan
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36 , 45470 Mülheim an der Ruhr , Germany .
| | - Dimitrios A Pantazis
- Max Planck Institute for Chemical Energy Conversion , Stiftstrasse 34-36 , 45470 Mülheim an der Ruhr , Germany .
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