101
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Boussac A. Temperature dependence of the high-spin S2 to S3 transition in Photosystem II: Mechanistic consequences. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2019; 1860:508-518. [DOI: 10.1016/j.bbabio.2019.05.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Revised: 12/20/2018] [Accepted: 01/06/2019] [Indexed: 02/08/2023]
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102
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Mauthe S, Fleischer I, Bernhardt TM, Lang SM, Barnett RN, Landman U. A Gas‐Phase Ca
n
Mn
4−
n
O
4
+
Cluster Model for the Oxygen‐Evolving Complex of Photosystem II. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201903738] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Silvia Mauthe
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Irene Fleischer
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Thorsten M. Bernhardt
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Sandra M. Lang
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Robert N. Barnett
- School of Physics Georgia Institute of Technology Atlanta Georgia 30332-0430 USA
| | - Uzi Landman
- School of Physics Georgia Institute of Technology Atlanta Georgia 30332-0430 USA
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103
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Mauthe S, Fleischer I, Bernhardt TM, Lang SM, Barnett RN, Landman U. A Gas‐Phase Ca
n
Mn
4−
n
O
4
+
Cluster Model for the Oxygen‐Evolving Complex of Photosystem II. Angew Chem Int Ed Engl 2019; 58:8504-8509. [DOI: 10.1002/anie.201903738] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Silvia Mauthe
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Irene Fleischer
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Thorsten M. Bernhardt
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Sandra M. Lang
- Institute of Surface Chemistry and Catalysis University of Ulm Albert-Einstein-Allee 47 89069 Ulm Germany
| | - Robert N. Barnett
- School of Physics Georgia Institute of Technology Atlanta Georgia 30332-0430 USA
| | - Uzi Landman
- School of Physics Georgia Institute of Technology Atlanta Georgia 30332-0430 USA
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104
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Chatterjee R, Lassalle L, Gul S, Fuller FD, Young ID, Ibrahim M, de Lichtenberg C, Cheah MH, Zouni A, Messinger J, Yachandra VK, Kern J, Yano J. Structural isomers of the S 2 state in photosystem II: do they exist at room temperature and are they important for function? PHYSIOLOGIA PLANTARUM 2019; 166:60-72. [PMID: 30793319 PMCID: PMC6478542 DOI: 10.1111/ppl.12947] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 02/16/2019] [Accepted: 02/18/2019] [Indexed: 05/21/2023]
Abstract
In nature, an oxo-bridged Mn4 CaO5 cluster embedded in photosystem II (PSII), a membrane-bound multi-subunit pigment protein complex, catalyzes the water oxidation reaction that is driven by light-induced charge separations in the reaction center of PSII. The Mn4 CaO5 cluster accumulates four oxidizing equivalents to enable the four-electron four-proton catalysis of two water molecules to one dioxygen molecule and cycles through five intermediate S-states, S0 - S4 in the Kok cycle. One important question related to the catalytic mechanism of the oxygen-evolving complex (OEC) that remains is, whether structural isomers are present in some of the intermediate S-states and if such equilibria are essential for the mechanism of the O-O bond formation. Here we compare results from electron paramagnetic resonance (EPR) and X-ray absorption spectroscopy (XAS) obtained at cryogenic temperatures for the S2 state of PSII with structural data collected of the S1 , S2 and S3 states by serial crystallography at neutral pH (∼6.5) using an X-ray free electron laser at room temperature. While the cryogenic data show the presence of at least two structural forms of the S2 state, the room temperature crystallography data can be well-described by just one S2 structure. We discuss the deviating results and outline experimental strategies for clarifying this mechanistically important question.
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Affiliation(s)
- Ruchira Chatterjee
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Louise Lassalle
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Sheraz Gul
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Franklin D. Fuller
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Iris D. Young
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
| | - Mohamed Ibrahim
- Institut für Biologie, Humboldt-Universität zu Berlin, D-10099 Berlin, Germany
| | - Casper de Lichtenberg
- Department of Chemistry - Ångström, Molecular Biomimetics, Uppsala University, SE 75237 Uppsala, Sweden
- Institutionen för Kemi, Kemiskt Biologiskt Centrum, Umeå Universitet, SE 90187 Umeå, Sweden
| | - Mun Hon Cheah
- Department of Chemistry - Ångström, Molecular Biomimetics, Uppsala University, SE 75237 Uppsala, Sweden
| | - Athina Zouni
- Institut für Biologie, Humboldt-Universität zu Berlin, D-10099 Berlin, Germany
| | - Johannes Messinger
- Department of Chemistry - Ångström, Molecular Biomimetics, Uppsala University, SE 75237 Uppsala, Sweden
- Institutionen för Kemi, Kemiskt Biologiskt Centrum, Umeå Universitet, SE 90187 Umeå, Sweden
- Correspondence Corresponding authors, , , ,
| | - Vittal K. Yachandra
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Correspondence Corresponding authors, , , ,
| | - Jan Kern
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Correspondence Corresponding authors, , , ,
| | - Junko Yano
- Molecular Biophysics and Integrated Bioimaging Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
- Correspondence Corresponding authors, , , ,
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105
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The S3 State of the Oxygen-Evolving Complex: Overview of Spectroscopy and XFEL Crystallography with a Critical Evaluation of Early-Onset Models for O–O Bond Formation. INORGANICS 2019. [DOI: 10.3390/inorganics7040055] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The catalytic cycle of the oxygen-evolving complex (OEC) of photosystem II (PSII) comprises five intermediate states Si (i = 0–4), from the most reduced S0 state to the most oxidized S4, which spontaneously evolves dioxygen. The precise geometric and electronic structure of the Si states, and hence the mechanism of O–O bond formation in the OEC, remain under investigation, particularly for the final steps of the catalytic cycle. Recent advances in protein crystallography based on X-ray free-electron lasers (XFELs) have produced new structural models for the S3 state, which indicate that two of the oxygen atoms of the inorganic Mn4CaO6 core of the OEC are in very close proximity. This has been interpreted as possible evidence for “early-onset” O–O bond formation in the S3 state, as opposed to the more widely accepted view that the O–O bond is formed in the final state of the cycle, S4. Peroxo or superoxo formation in S3 has received partial support from computational studies. Here, a brief overview is provided of spectroscopic information, recent crystallographic results, and computational models for the S3 state. Emphasis is placed on computational S3 models that involve O–O formation, which are discussed with respect to their agreement with structural information, experimental evidence from various spectroscopic studies, and substrate exchange kinetics. Despite seemingly better agreement with some of the available crystallographic interpretations for the S3 state, models that implicate early-onset O–O bond formation are hard to reconcile with the complete line of experimental evidence, especially with X-ray absorption, X-ray emission, and magnetic resonance spectroscopic observations. Specifically with respect to quantum chemical studies, the inconclusive energetics for the possible isoforms of S3 is an acute problem that is probably beyond the capabilities of standard density functional theory.
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106
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Isobe H, Shoji M, Suzuki T, Shen JR, Yamaguchi K. Spin, Valence, and Structural Isomerism in the S 3 State of the Oxygen-Evolving Complex of Photosystem II as a Manifestation of Multimetallic Cooperativity. J Chem Theory Comput 2019; 15:2375-2391. [PMID: 30855953 DOI: 10.1021/acs.jctc.8b01055] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Photosynthetic water oxidation is catalyzed by a Mn4CaO5-cluster in photosystem II through an S-state cycle. Understanding the roles of heterogeneity in each S-state, as identified recently by the EPR spectroscopy, is very important to gain a complete description of the catalytic mechanism. We performed herein hybrid DFT calculations within the broken-symmetry formalism and associated analyses of Heisenberg spin models to study the electronic and spin structures of various isomeric structural motifs (hydroxo-oxo, oxyl-oxo, peroxo, and superoxo species) in the S3 state. Our extensive study reveals several factors that affect the spin ground state: (1) (formal) Mn oxidation state; (2) metal-ligand covalency; (3) coordination geometry; and (4) structural change of the Mn cluster induced by alternations in Mn···Mn distances. Some combination of these effects could selectively stabilize/destabilize some spin states. We found that the high spin state ( Stotal = 6) of the oxyl-oxo species can be causative for catalytic function, which manifests through mixing of the metal-ligand character in magnetic orbitals at relatively short O5···O6 distances (<2.0 Å) and long MnA···O5 distances (>2.0 Å). These results will serve as a basis to conceptually identify and rationalize the physicochemical synergisms that can be evoked by the unique "distorted chair" topology of the cluster through cooperative Jahn-Teller effects on multimetallic centers.
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Affiliation(s)
- Hiroshi Isobe
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
| | - Mitsuo Shoji
- Center for Computational Science , University of Tsukuba , Tsukuba , Ibaraki 305-8577 , Japan
| | - Takayoshi Suzuki
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
| | - Jian-Ren Shen
- Research Institute for Interdisciplinary Science , Okayama University , Okayama 700-8530 , Japan
| | - Kizashi Yamaguchi
- Institute for NanoScience Design , Osaka University , Toyonaka , Osaka 560-0043 , Japan
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107
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Li YY, Gimbert C, Llobet A, Siegbahn PEM, Liao RZ. Quantum Chemical Study of the Mechanism of Water Oxidation Catalyzed by a Heterotrinuclear Ru 2 Mn Complex. CHEMSUSCHEM 2019; 12:1101-1110. [PMID: 30604589 DOI: 10.1002/cssc.201802395] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 12/11/2018] [Indexed: 06/09/2023]
Abstract
The heterotrinuclear complex A {[RuII (H2 O)(tpy)]2 (μ-[MnII (H2 O)2 (bpp)2 ])}4+ [tpy=2,2':6',2''-terpyridine, bpp=3,5-bis(2-pyridyl)pyrazolate] was found to catalyze water oxidation both electrochemically and photochemically with [Ru(bpy)3 ]3+ (bpy=2,2'-bipyridine) as the photosensitizer and Na2 S2 O8 as the electron acceptor in neutral phosphate buffer. The mechanism of water oxidation catalyzed by this unprecedented trinuclear complex was studied by density functional calculations. The calculations showed that a series of oxidation and deprotonation events take place from A, leading to the formation of complex 1 (formal oxidation state of Ru1IV MnIII Ru2III ), which is the starting species for the catalytic cycle. Three sequential oxidations of 1 result in the generation of the catalytically competing species 4 (formal oxidation state of Ru1IV MnV Ru2IV ), which triggers the O-O bond formation. The direct coupling of two adjacent oxo ligands bound to Ru and Mn leads to the production of a superoxide intermediate Int1. This step was calculated to have a barrier of 7.2 kcal mol-1 at the B3LYP*-D3 level. Subsequent O2 release from Int1 turns out to be quite facile. Other possible pathways were found to be much less favorable, including water nucleophilic attack, the coupling of an oxo and a hydroxide, and the direct coupling pathway at a lower oxidation state (RuIV MnIV RuIV ).
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Affiliation(s)
- Ying-Ying Li
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P.R. China
| | - Carolina Gimbert
- Institute of Chemical Research of Catalonia (ICIQ-BIST), Avinguda Països Catalans 16, 43007, Tarragona, Spain
| | - Antoni Llobet
- Institute of Chemical Research of Catalonia (ICIQ-BIST), Avinguda Països Catalans 16, 43007, Tarragona, Spain
| | - Per E M Siegbahn
- Department of Organic Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm, 10691, Sweden
| | - Rong-Zhen Liao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, P.R. China
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108
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Pham LV, Janna Olmos JD, Chernev P, Kargul J, Messinger J. Unequal misses during the flash-induced advancement of photosystem II: effects of the S state and acceptor side cycles. PHOTOSYNTHESIS RESEARCH 2019; 139:93-106. [PMID: 30191436 PMCID: PMC6373315 DOI: 10.1007/s11120-018-0574-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Accepted: 08/03/2018] [Indexed: 05/17/2023]
Abstract
Photosynthetic water oxidation is catalyzed by the oxygen-evolving complex (OEC) in photosystem II (PSII). This process is energetically driven by light-induced charge separation in the reaction center of PSII, which leads to a stepwise accumulation of oxidizing equivalents in the OEC (Si states, i = 0-4) resulting in O2 evolution after each fourth flash, and to the reduction of plastoquinone to plastoquinol on the acceptor side of PSII. However, the Si-state advancement is not perfect, which according to the Kok model is described by miss-hits (misses). These may be caused by redox equilibria or kinetic limitations on the donor (OEC) or the acceptor side. In this study, we investigate the effects of individual S state transitions and of the quinone acceptor side on the miss parameter by analyzing the flash-induced oxygen evolution patterns and the S2, S3 and S0 state lifetimes in thylakoid samples of the extremophilic red alga Cyanidioschyzon merolae. The data are analyzed employing a global fit analysis and the results are compared to the data obtained previously for spinach thylakoids. These two organisms were selected, because the redox potential of QA/QA- in PSII is significantly less negative in C. merolae (Em = - 104 mV) than in spinach (Em = - 163 mV). This significant difference in redox potential was expected to allow the disentanglement of acceptor and donor side effects on the miss parameter. Our data indicate that, at slightly acidic and neutral pH values, the Em of QA-/QA plays only a minor role for the miss parameter. By contrast, the increased energy gap for the backward electron transfer from QA- to Pheo slows down the charge recombination reaction with the S3 and S2 states considerably. In addition, our data support the concept that the S2 → S3 transition is the least efficient step during the oxidation of water to molecular oxygen in the Kok cycle of PSII.
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Affiliation(s)
- Long Vo Pham
- Department of Chemistry - Ångström, Uppsala University, Lägerhyddsvägen 1, 75120, Uppsala, Sweden
| | - Julian David Janna Olmos
- Solar Fuels Lab, Centre of New Technologies, University of Warsaw, Banacha 2C, 02-097, Warsaw, Poland
- Department of Molecular Biophysics, Faculty of Biochemistry, Biophysics, and Biotechnology, Jagiellonian University, Gronostajowa 7, 30-387, Kraków, Poland
| | - Petko Chernev
- Department of Chemistry - Ångström, Uppsala University, Lägerhyddsvägen 1, 75120, Uppsala, Sweden
| | - Joanna Kargul
- Solar Fuels Lab, Centre of New Technologies, University of Warsaw, Banacha 2C, 02-097, Warsaw, Poland.
| | - Johannes Messinger
- Department of Chemistry - Ångström, Uppsala University, Lägerhyddsvägen 1, 75120, Uppsala, Sweden.
- Department of Chemistry, Chemistry Biology Center (KBC), Umeå University, Linnaeus väg 6, 901 87, Umeå, Sweden.
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109
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Das S, Das K, Kübel C, Roy S. Light Driven Water Oxidation Coupled With C-N Coupling Reaction Using a Hybrid Cu-PW12
O40
Based Soft-Oxometalate. ChemistrySelect 2019. [DOI: 10.1002/slct.201803949] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Santu Das
- EFAML; College of Chemistry; Central China Normal University; 152 Luoyu Road, Wuhan, Hubei 430079 P. R. China
- EFAML; Department of Chemical Sciences; Indian Institute of Science Education and Research, Kolkata; Mohanpur 741246 India
| | - Kousik Das
- EFAML; College of Chemistry; Central China Normal University; 152 Luoyu Road, Wuhan, Hubei 430079 P. R. China
- EFAML; Department of Chemical Sciences; Indian Institute of Science Education and Research, Kolkata; Mohanpur 741246 India
| | - Christian Kübel
- Institute of Nanotechnology INT) and Karlsruhe Nano Micro Facility (KNMF); Karlsruhe Institute of Technology (KIT); Karlsruhe Germany
| | - Soumyajit Roy
- EFAML; College of Chemistry; Central China Normal University; 152 Luoyu Road, Wuhan, Hubei 430079 P. R. China
- EFAML; Department of Chemical Sciences; Indian Institute of Science Education and Research, Kolkata; Mohanpur 741246 India
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110
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Abstract
Photosystem II (PSII) uses water as the terminal electron donor, producing oxygen in the Mn4CaO5 oxygen evolving complex (OEC), while cytochrome c oxidase (CcO) reduces O2 to water in its heme–Cu binuclear center (BNC). Each protein is oriented in the membrane to add to the proton gradient. The OEC, which releases protons, is located near the P-side (positive, at low-pH) of the membrane. In contrast, the BNC is in the middle of CcO, so the protons needed for O2 reduction must be transferred from the N-side (negative, at high pH). In addition, CcO pumps protons from N- to P-side, coupled to the O2 reduction chemistry, to store additional energy. Thus, proton transfers are directly coupled to the OEC and BNC redox chemistry, as well as needed for CcO proton pumping. The simulations that study the changes in proton affinity of the redox active sites and the surrounding protein at different states of the reaction cycle, as well as the changes in hydration that modulate proton transfer paths, are described.
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111
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Chen C, Chen Y, Yao R, Li Y, Zhang C. Artificial Mn 4 Ca Clusters with Exchangeable Solvent Molecules Mimicking the Oxygen-Evolving Center in Photosynthesis. Angew Chem Int Ed Engl 2019; 58:3939-3942. [PMID: 30614609 DOI: 10.1002/anie.201814440] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Indexed: 11/08/2022]
Abstract
The natural Mn4 Ca cluster in photosystem II serves as a blueprint to develop artificial water-splitting catalysts for the generation of solar fuel in artificial photosynthesis. Although significant advances have recently been achieved, it remains a great challenge to prepare robust artificial Mn4 Ca clusters that precisely mimic the structure and function of the biological catalyst. Herein, we report the isolation and structural characterization of two Mn4 CaO4 complexes with polar solvent molecules, acetonitrile or N,N-dimethylformamide, which closely mimics the two water molecules on the calcium ion, as well as the oxidation states of the four manganese ions and the main geometric structure of the natural Mn4 Ca cluster. These new artificial Mn4 Ca complexes provide important chemical clues to understand the structure and mechanism of the biological system.
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Affiliation(s)
- Changhui Chen
- Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yang Chen
- Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ruoqing Yao
- Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yanxi Li
- Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Chunxi Zhang
- Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
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112
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Chen C, Chen Y, Yao R, Li Y, Zhang C. Artificial Mn
4
Ca Clusters with Exchangeable Solvent Molecules Mimicking the Oxygen‐Evolving Center in Photosynthesis. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201814440] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Changhui Chen
- Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of Sciences Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Yang Chen
- Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of Sciences Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Ruoqing Yao
- Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of Sciences Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Yanxi Li
- Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of Sciences Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Chunxi Zhang
- Laboratory of PhotochemistryInstitute of ChemistryChinese Academy of Sciences Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
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113
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Abstract
AbstractCyanobacteria and plants carry out oxygenic photosynthesis. They use water to generate the atmospheric oxygen we breathe and carbon dioxide to produce the biomass serving as food, feed, fibre and fuel. This paper scans the emergence of structural and mechanistic understanding of oxygen evolution over the past 50 years. It reviews speculative concepts and the stepped insight provided by novel experimental and theoretical techniques. Driven by sunlight photosystem II oxidizes the catalyst of water oxidation, a hetero-metallic Mn4CaO5(H2O)4 cluster. Mn3Ca are arranged in cubanoid and one Mn dangles out. By accumulation of four oxidizing equivalents before initiating dioxygen formation it matches the four-electron chemistry from water to dioxygen to the one-electron chemistry of the photo-sensitizer. Potentially harmful intermediates are thereby occluded in space and time. Kinetic signatures of the catalytic cluster and its partners in the photo-reaction centre have been resolved, in the frequency domain ranging from acoustic waves via infra-red to X-ray radiation, and in the time domain from nano- to milli-seconds. X-ray structures to a resolution of 1.9 Å are available. Even time resolved X-ray structures have been obtained by clocking the reaction cycle by flashes of light and diffraction with femtosecond X-ray pulses. The terminal reaction cascade from two molecules of water to dioxygen involves the transfer of four electrons, two protons, one dioxygen and one water. A rigorous mechanistic analysis is challenging because of the kinetic enslaving at millisecond duration of six partial reactions (4e−, 1H+, 1O2). For the time being a peroxide-intermediate in the reaction cascade to dioxygen has been in focus, both experimentally and by quantum chemistry. Homo sapiens has relied on burning the products of oxygenic photosynthesis, recent and fossil. Mankind's total energy consumption amounts to almost one-fourth of the global photosynthetic productivity. If the average power consumption equalled one of those nations with the highest consumption per capita it was four times greater and matched the total productivity. It is obvious that biomass should be harvested for food, feed, fibre and platform chemicals rather than for fuel.
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114
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Abstract
Nitrogen in the air is turned into biologically useful ammonia by the nitrogenase enzyme. The leading member of this group has a cofactor with one molybdenum and seven irons linked together by sulfurs. The structure that binds N2 has a triply protonated carbide and a rotated homocitrate. Both these structural changes are necessary for the activation.
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Affiliation(s)
- Per E. M. Siegbahn
- Department of Organic Chemistry
- Arrhenius Laboratory
- Stockholm University
- Stockholm
- Sweden
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115
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Concerted bond switching mechanism coupled with one-electron transfer for the oxygen-oxygen bond formation in the oxygen-evolving complex of photosystem II. Chem Phys Lett 2019. [DOI: 10.1016/j.cplett.2018.10.041] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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116
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Zaharieva I, Dau H. Energetics and Kinetics of S-State Transitions Monitored by Delayed Chlorophyll Fluorescence. FRONTIERS IN PLANT SCIENCE 2019; 10:386. [PMID: 30984228 PMCID: PMC6450259 DOI: 10.3389/fpls.2019.00386] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 03/13/2019] [Indexed: 05/21/2023]
Abstract
Understanding energetic and kinetic parameters of intermediates formed in the course of the reaction cycle (S-state cycle) of photosynthetic water oxidation is of high interest and could support the rationale designs of artificial systems for solar fuels. We use time-resolved measurements of the delayed chlorophyll fluorescence to estimate rate constants, activation energies, free energy differences, and to discriminate between the enthalpic and the entropic contributions to the decrease of the Gibbs free energy of the individual transitions. Using a joint-fit simulation approach, kinetic parameters are determined for the reaction intermediates in the S-state transitions in buffers with different pH in H2O and in D2O.
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Affiliation(s)
| | - Holger Dau
- *Correspondence: Ivelina Zaharieva, Holger Dau,
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117
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Wei WJ, Qian HX, Wang WJ, Liao RZ. Computational Understanding of the Selectivities in Metalloenzymes. Front Chem 2018; 6:638. [PMID: 30622942 PMCID: PMC6308299 DOI: 10.3389/fchem.2018.00638] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Accepted: 12/07/2018] [Indexed: 01/26/2023] Open
Abstract
Metalloenzymes catalyze many different types of biological reactions with high efficiency and remarkable selectivity. The quantum chemical cluster approach and the combined quantum mechanics/molecular mechanics methods have proven very successful in the elucidation of the reaction mechanism and rationalization of selectivities in enzymes. In this review, recent progress in the computational understanding of various selectivities including chemoselectivity, regioselectivity, and stereoselectivity, in metalloenzymes, is discussed.
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Affiliation(s)
| | | | | | - Rong-Zhen Liao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Bioinorganic Chemistry and Materia Medica, Hubei Key Laboratory of Materials Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, China
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118
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Siegbahn PEM, Blomberg MRA. A Systematic DFT Approach for Studying Mechanisms of Redox Active Enzymes. Front Chem 2018; 6:644. [PMID: 30627530 PMCID: PMC6309562 DOI: 10.3389/fchem.2018.00644] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2018] [Accepted: 12/11/2018] [Indexed: 02/03/2023] Open
Abstract
When DFT has been applied to study mechanisms of redox processes a common procedure has been to study the results for many different functionals. For redox reactions involving the first row transition metals, this approach has given very different results for different functionals. The conclusion has been that DFT cannot be used for these reactions. In the meantime, results with strong predictability have been generated, most noteworthy for photosystem II, where all DFT predictions have been verified by experiments performed later. In order to obtain these predictive results using DFT, an alternative, systematic approach has been used, where the key differences between the results for different functionals can be rationalized by using a single parameter, rather than using the very large number of differences in the functionals.
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Affiliation(s)
- Per E M Siegbahn
- Arrhenius Laboratory, Department of Organic Chemistry, Stockholm University, Stockholm, Sweden
| | - Margareta R A Blomberg
- Arrhenius Laboratory, Department of Organic Chemistry, Stockholm University, Stockholm, Sweden
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119
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Theoretical study of the mechanism of the manganese catalase KatB. J Biol Inorg Chem 2018; 24:103-115. [DOI: 10.1007/s00775-018-1631-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 11/14/2018] [Indexed: 11/30/2022]
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120
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Yamaguchi K, Shoji M, Isobe H, Miyagawa K, Nakatani K. Theory of chemical bonds in metalloenzymes XXII: a concerted bond-switching mechanism for the oxygen–oxygen bond formation coupled with one electron transfer for water oxidation in the oxygen-evolving complex of photosystem II. Mol Phys 2018. [DOI: 10.1080/00268976.2018.1552799] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- K. Yamaguchi
- Institute for Nanoscience Design, Osaka University, Toyonaka, Osaka, Japan
- The Institute for Scientific and Industrial Research, Osaka University, Osaka, Japan
- Handairigaku Techno-Research, Toyonaka, Osaka, Japan
| | - M. Shoji
- Center of Computational Sciences, Tsukuba University, Tsukuba, Ibaraki, Japan
| | - H. Isobe
- Graduate School of Natural Science and Technology, Okayama University, Okayama, Japan
| | - K. Miyagawa
- The Institute for Scientific and Industrial Research, Osaka University, Osaka, Japan
| | - K. Nakatani
- The Institute for Scientific and Industrial Research, Osaka University, Osaka, Japan
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121
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Probing the role of Valine 185 of the D1 protein in the Photosystem II oxygen evolution. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1859:1259-1273. [DOI: 10.1016/j.bbabio.2018.10.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2018] [Revised: 10/03/2018] [Accepted: 10/14/2018] [Indexed: 11/23/2022]
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122
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Chen H, Case DA, Dismukes GC. Reconciling Structural and Spectroscopic Fingerprints of the Oxygen-Evolving Complex of Photosystem II: A Computational Study of the S 2 State. J Phys Chem B 2018; 122:11868-11882. [PMID: 30444623 DOI: 10.1021/acs.jpcb.8b08147] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The catalytic cycle of photosynthetic water oxidation occurs at the Mn4CaO5 oxygen-evolving complex (OEC) of photosystem II. Extensive spectroscopic data have been collected on the intermediates, especially the S2 (Kok) state, although the proton and electron inventories (Mn oxidation states) are still uncertain. The "high oxidation" paradigm assigns S2 Mn oxidation level (III, IV, IV, IV) or (IV, IV, IV, III), whereas a "low oxidation" paradigm posits two additional electrons. Here, we investigate the geometric (X-ray diffraction, extended X-ray absorption fine structure) and spectroscopic (electron paramagnetic resonance (EPR), electron nuclear double resonance (ENDOR)) properties of the S2 state using quantum chemical density functional theory calculations, focusing on the neglected low paradigm. Two interconvertible electronic spin configurations are predicted as ground states, producing multiline ( S = 1/2) and broad ( S = 5/2) EPR signals in the low paradigm oxidation state (III, IV, III, III) and with W2 as OH- and O5 as OH-. They have "open" ( S = 5/2) and "closed" ( S = 1/2) Mn3CaO4-cubane geometries. Other energetically accessible isomers with ground spin states 1/2, 7/2, 9/2, or 11/2 can be obtained through perturbations of hydrogen-bonding networks (e.g., H+ from His337 to O3 or W2), consistent with experimental observations. Conformers with the low oxidation state configuration (III, IV, IV, II) also become energetically accessible when the protonation states are O5 (OH-), W2 (H2O), and neutral His337. The configuration with (III, IV, III, III) agrees well with earlier low-temperature EPR and ENDOR interpretations, whereas the MnII-containing configuration agrees partially with recent ENDOR data. However, the low oxidation paradigm does not yield isotropic ligand hyperfine interactions in good agreement with observed values. We conclude that the low Mn oxidation state proposal for the OEC can closely fit most of the available structural and electronic data for S2 at accessible energies.
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123
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Shamsipur M, Pashabadi A. Latest advances in PSII features and mechanism of water oxidation. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.07.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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124
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Corry TA, O'Malley PJ. Evidence of O-O Bond Formation in the Final Metastable S 3 State of Nature's Water Oxidizing Complex Implying a Novel Mechanism of Water Oxidation. J Phys Chem Lett 2018; 9:6269-6274. [PMID: 30336040 DOI: 10.1021/acs.jpclett.8b02793] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A novel mechanism for the final stages of Nature's photosynthetic water oxidation to molecular oxygen is proposed. This is based on a comparison of experimental and broken symmetry density functional theory (BS-DFT) calculated geometries and magnetic resonance properties of water oxidizing complex models in the final metastable oxidation state, S3. We show that peroxo models of the S3 state are in vastly superior agreement with the current experimental structural determinations compared with oxo-hydroxo models. Comparison of experimental and BS-DFT calculated 55Mn hyperfine couplings for the electron paramagnetic resonance (EPR) visible form shows better agreement for the oxo-hydroxo model. An equilibrium between oxo-hydroxo and peroxo models is proposed for the S3 state and the major implications for the final steps in the water oxidation mechanism are analyzed and discussed.
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Affiliation(s)
- 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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125
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126
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Davis KM, Sullivan BT, Palenik MC, Yan L, Purohit V, Robison G, Kosheleva I, Henning RW, Seidler GT, Pushkar Y. Rapid evolution of the Photosystem II electronic structure during water splitting. PHYSICAL REVIEW. X 2018; 8:041014. [PMID: 31231592 PMCID: PMC6588194 DOI: 10.1103/physrevx.8.041014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
Photosynthetic water oxidation is a fundamental process that sustains the biosphere. A Mn4Ca cluster embedded in the photosystem II protein environment is responsible for the production of atmospheric oxygen. Here, time-resolved x-ray emission spectroscopy (XES) was used to observe the process of oxygen formation in real time. These experiments reveal that the oxygen evolution step, initiated by three sequential laser flashes, is accompanied by rapid (within 50 μs) changes to the Mn Kβ XES spectrum. However, no oxidation of the Mn4Ca core above the all MnIV state was detected to precede O-O bond formation, and the observed changes were therefore assigned to O-O bond formation dynamics. We propose that O-O bond formation occurs prior to the transfer of the final (4th) electron from the Mn4Ca cluster to the oxidized tyrosine YZ residue. This model resolves the kinetic limitations associated with O-O bond formation, and suggests an evolutionary adaptation to avoid releasing of harmful peroxide species.
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Affiliation(s)
- Katherine M. Davis
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | - Brendan T. Sullivan
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | | | - Lifen Yan
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | - Vatsal Purohit
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | - Gregory Robison
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
| | - Irina Kosheleva
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL 60637, USA
| | - Robert W. Henning
- Center for Advanced Radiation Sources, The University of Chicago, Chicago, IL 60637, USA
| | - Gerald T. Seidler
- Department of Physics, University of Washington, Seattle, WA 98195, USA
| | - Yulia Pushkar
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47907, USA
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127
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Wang Y, Zhan S, Ahlquist MSG. Nucleophilic Attack by OH2 or OH–: A Detailed Investigation on pH-Dependent Performance of a Ru Catalyst. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00544] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ying Wang
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
| | - Shaoqi Zhan
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
| | - Mårten S. G. Ahlquist
- Department of Theoretical Chemistry & Biology, School of Engineering Sciences in Chemistry Biotechnology and Health, KTH Royal Institute of Technology, 10691 Stockholm, Sweden
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128
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Shimizu T, Sugiura M, Noguchi T. Mechanism of Proton-Coupled Electron Transfer in the S0-to-S1 Transition of Photosynthetic Water Oxidation As Revealed by Time-Resolved Infrared Spectroscopy. J Phys Chem B 2018; 122:9460-9470. [DOI: 10.1021/acs.jpcb.8b07455] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Tatsuki Shimizu
- Division of Material Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
| | - Miwa Sugiura
- Proteo-Science Research Center, Ehime University, Bunkyo-cho, Matsuyama, Ehime 790-8577, 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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129
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Affiliation(s)
- Dimitrios A. Pantazis
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
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130
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Reed CJ, Agapie T. Thermodynamics of Proton and Electron Transfer in Tetranuclear Clusters with Mn-OH 2/OH Motifs Relevant to H 2O Activation by the Oxygen Evolving Complex in Photosystem II. J Am Chem Soc 2018; 140:10900-10908. [PMID: 30064207 DOI: 10.1021/jacs.8b06426] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We report the synthesis of site-differentiated heterometallic clusters with three Fe centers and a single Mn site that binds water and hydroxide in multiple cluster oxidation states. Deprotonation of FeIII/II3MnII-OH2 clusters leads to internal reorganization resulting in formal oxidation at Mn to generate FeIII/II3MnIII-OH. 57Fe Mössbauer spectroscopy reveals that oxidation state changes (three for FeIII/II3Mn-OH2 and four for FeIII/II3Mn-OH clusters) occur exclusively at the Fe centers; the Mn center is formally MnII when water is bound and MnIII when hydroxide is bound. Experimentally determined p Ka (17.4) of the [FeIII2FeIIMnII-OH2] cluster and the reduction potentials of the [Fe3Mn-OH2] and [Fe3Mn-OH] clusters were used to analyze the O-H bond dissociation enthalpies (BDEO-H) for multiple cluster oxidation states. BDEO-H increases from 69 to 78 and 85 kcal/mol for the [FeIIIFeII2MnII-OH2], [FeIII2FeIIMnII-OH2], and [FeIII3MnII-OH2] clusters, respectively. Further insight of the proton and electron transfer thermodynamics of the [Fe3Mn-OH x] system was obtained by constructing a potential-p Ka diagram; the shift in reduction potentials of the [Fe3Mn-OH x] clusters in the presence of different bases supports the BDEO-H values reported for the [Fe3Mn-OH2] clusters. A lower limit of the p Ka for the hydroxide ligand of the [Fe3Mn-OH] clusters was estimated for two oxidation states. These data suggest BDEO-H values for the [FeIII2FeIIMnIII-OH] and [FeIII3MnIII-OH] clusters are greater than 93 and 103 kcal/mol, which hints to the high reactivity expected of the resulting [Fe3Mn═O] in this and related multinuclear systems.
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Affiliation(s)
- Christopher J Reed
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
| | - Theodor Agapie
- Division of Chemistry and Chemical Engineering , California Institute of Technology , Pasadena , California 91125 , United States
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131
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Yata H, Noguchi T. Mechanism of Methanol Inhibition of Photosynthetic Water Oxidation As Studied by Fourier Transform Infrared Difference and Time-Resolved Infrared Spectroscopies. Biochemistry 2018; 57:4803-4815. [DOI: 10.1021/acs.biochem.8b00596] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Haruna Yata
- 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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132
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Nguyen AI, Darago LE, Balcells D, Tilley TD. Influence of a "Dangling" Co(II) Ion Bound to a [MnCo 3O 4] Oxo Cubane. J Am Chem Soc 2018; 140:9030-9033. [PMID: 30001620 DOI: 10.1021/jacs.8b04065] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Cobalt(II), in the presence of acetate and nitrate, quantitatively adds to the manganese-cobalt oxido cubane MnIVCoIII3O4(OAc)5(py)3 (1) to furnish the pentametallic dangler complex MnIVCoIII3CoIIO4(OAc)6(NO3)(py)3 (2). Complex 2 is structurally reminiscent of photosystem II's oxygen-evolving center, and is a rare example of a transition-metal "dangler" complex. Superconducting quantum interference device magnetometry and density functional theory calculations characterize 2 as having an S = 0 ground state arising from antiferromagnetic coupling between the CoII and MnIV ions. At higher temperatures, an uncoupled state dominates. The voltammogram of 2 has four electrochemical events, two more than that of its parent cubane 1, suggesting that addition of the dangler increases available redox states. Structural, electrochemical, and magnetic comparisons of complexes 1 and 2 allow a better understanding of the dangler's influence on a cubane.
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Affiliation(s)
- Andy I Nguyen
- Department of Chemistry , University of California at Berkeley , Berkeley , California 94720-1460 , United States
| | - Lucy E Darago
- Department of Chemistry , University of California at Berkeley , Berkeley , California 94720-1460 , United States
| | - David Balcells
- Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry , University of Oslo , P.O. Box 1033, Blindern, 0315 Oslo , Norway
| | - T Don Tilley
- Department of Chemistry , University of California at Berkeley , Berkeley , California 94720-1460 , United States
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133
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Kim CJ, Bao H, Burnap RL, Debus RJ. Impact of D1-V185 on the Water Molecules That Facilitate O2 Formation by the Catalytic Mn4CaO5 Cluster in Photosystem II. Biochemistry 2018; 57:4299-4311. [DOI: 10.1021/acs.biochem.8b00630] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher J. Kim
- Department of Biochemistry, University of California, Riverside, California 92521, United States
| | - Han Bao
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Robert L. Burnap
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Richard J. Debus
- Department of Biochemistry, University of California, Riverside, California 92521, United States
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134
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Pushkar Y, Davis KM, Palenik MC. Model of the Oxygen Evolving Complex Which Is Highly Predisposed to O-O Bond Formation. J Phys Chem Lett 2018; 9:3525-3531. [PMID: 29863871 DOI: 10.1021/acs.jpclett.8b00800] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Light-driven water oxidation is a fundamental reaction in the biosphere. The Mn4Ca cluster of photosystem II cycles through five redox states termed S0-S4, after which oxygen is evolved. Critically, the timing of O-O bond formation within the Kok cycle remains unknown. By combining recent crystallographic, spectroscopic, and DFT results, we demonstrate an atomistic S3 state model with the possibility of a low barrier to O-O bond formation prior to the final oxidation step. Furthermore, the associated one electron oxidized S4 state does not provide more advantages in terms of spin alignment or the energy of O-O bond formation. We propose that a high energy peroxide isoform of the S3 state can preferentially be oxidized by Tyr zox in the course of final electron transfer leading to O2 evolution. Such a mechanism may explain the peculiar kinetic behavior of O2 evolution as well as serve as an evolutionary adaptation to avoid release of the harmful peroxides.
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Affiliation(s)
- Yulia Pushkar
- Department of Physics and Astronomy , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Katherine M Davis
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , United States
| | - Mark C Palenik
- Chemistry Division , Naval Research Laboratory , NRC Research Associate, Code 6189, 4555 Overlook Avenue SW , Washington, DC 20375 , United States
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135
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Narzi D, Capone M, Bovi D, Guidoni L. Evolution from S3
to S4
States of the Oxygen-Evolving Complex in Photosystem II Monitored by Quantum Mechanics/Molecular Mechanics (QM/MM) Dynamics. Chemistry 2018; 24:10820-10828. [DOI: 10.1002/chem.201801709] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2018] [Indexed: 12/17/2022]
Affiliation(s)
- Daniele Narzi
- Institute of Chemical Sciences and Engineering; Ecole Polytechnique Federale de Lausanne; Av. F.-A. Forel 2 1015 Lausanne Switzerland
| | - Matteo Capone
- Dipartimento di Ingegneria e Scienze dell'Informazione e Matematica; Universita degli studi dell'Aquila; Via Vetoio (Coppito) 67100 L'Aquila Italy
| | - Daniele Bovi
- Dipartimento di Scienze Fisiche e Chimiche; Universita degli studi dell'Aquila; Via Vetoio (Coppito) 67100 L'Aquila Italy
| | - Leonardo Guidoni
- Dipartimento di Scienze Fisiche e Chimiche; Universita degli studi dell'Aquila; Via Vetoio (Coppito) 67100 L'Aquila Italy
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136
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Shoji M, Isobe H, Shigeta Y, Nakajima T, Yamaguchi K. Concerted Mechanism of Water Insertion and O2 Release during the S4 to S0 Transition of the Oxygen-Evolving Complex in Photosystem II. J Phys Chem B 2018; 122:6491-6502. [DOI: 10.1021/acs.jpcb.8b03465] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Mitsuo Shoji
- Center for Computational Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8577, Japan
| | - Hiroshi Isobe
- Graduate School of Natural Science and Technology, Faculty of Science, Okayama University, Okayama 700-8530, Japan
| | - Yasuteru Shigeta
- Center for Computational Sciences, University of Tsukuba, Tennodai 1-1-1, Tsukuba 305-8577, Japan
| | | | - Kizashi Yamaguchi
- Institute for NanoScience Design, Osaka University, Toyonaka, Osaka 560-0043, Japan
- Handairigaku Techno-Research (NPO), Toyonaka, Osaka 560-0043, Japan
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137
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Kato Y, Akita F, Nakajima Y, Suga M, Umena Y, Shen JR, Noguchi T. Fourier Transform Infrared Analysis of the S-State Cycle of Water Oxidation in the Microcrystals of Photosystem II. J Phys Chem Lett 2018; 9:2121-2126. [PMID: 29620370 DOI: 10.1021/acs.jpclett.8b00638] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Photosynthetic water oxidation is performed in photosystem II (PSII) through a light-driven cycle of intermediates called S states (S0-S4) at the water oxidizing center. Time-resolved serial femtosecond crystallography (SFX) has recently been applied to the microcrystals of PSII to obtain the structural information on these intermediates. However, it remains unanswered whether the reactions efficiently proceed throughout the S-state cycle retaining the native structures of the intermediates in PSII crystals. We investigated the water oxidation reactions in the PSII microcrystals using flash-induced Fourier transform infrared (FTIR) difference spectroscopy. In comparison with the FTIR spectra in solution, it was shown that all of the metastable intermediates in the microcrystals retained their native structures, and the efficiencies of the S-state transitions remained relatively high, although those of the S2 → S3 and S3 → S0 transitions were slightly lowered possibly due to some restriction of water movement in the crystals.
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Affiliation(s)
- Yuki Kato
- Division of Material Science, Graduate School of Science , Nagoya University , Furo-cho , Chikusa-ku, Nagoya 464-8602 , Japan
| | - Fusamichi Akita
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushima-naka , Kita-ku, Okayama 700-8530 , Japan
- Japan Science and Technology Agency, PRESTO , 4-1-8 Honcho , Kawaguchi, Saitama 332-0012 , Japan
| | - Yoshiki Nakajima
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushima-naka , Kita-ku, Okayama 700-8530 , Japan
| | - Michihiro Suga
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushima-naka , Kita-ku, Okayama 700-8530 , Japan
| | - Yasufumi Umena
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushima-naka , Kita-ku, Okayama 700-8530 , Japan
| | - Jian-Ren Shen
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology , Okayama University , 3-1-1 Tsushima-naka , Kita-ku, Okayama 700-8530 , 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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138
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The low spin - high spin equilibrium in the S2-state of the water oxidizing enzyme. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2018; 1859:342-356. [DOI: 10.1016/j.bbabio.2018.02.010] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 02/21/2018] [Accepted: 02/24/2018] [Indexed: 11/17/2022]
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139
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Xie Y, Shaffer DW, Concepcion JJ. O–O Radical Coupling: From Detailed Mechanistic Understanding to Enhanced Water Oxidation Catalysis. Inorg Chem 2018; 57:10533-10542. [DOI: 10.1021/acs.inorgchem.8b00329] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yan Xie
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - David W. Shaffer
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Javier J. Concepcion
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973, United States
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140
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Wilson AJ, Jain PK. Structural Dynamics of the Oxygen-Evolving Complex of Photosystem II in Water-Splitting Action. J Am Chem Soc 2018; 140:5853-5859. [PMID: 29649874 DOI: 10.1021/jacs.8b02620] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Oxygenic photosynthesis in nature occurs via water splitting catalyzed by the oxygen-evolving complex (OEC) of photosystem II. To split water, the OEC cycles through a sequence of oxidation states (S i, i = 0-4), the structural mechanism of which is not fully understood under physiological conditions. We monitored the OEC in visible-light-driven water-splitting action by using in situ, aqueous-environment surface-enhanced Raman scattering (SERS). In the unexplored low-frequency region of SERS, we found dynamic vibrational signatures of water binding and splitting. Specific snapshots in the dynamic SERS correspond to intermediate states in the catalytic cycle, as determined by density functional theory and isotopologue comparisons. We assign the previously ambiguous protonation configuration of the S0-S3 states and propose a structural mechanism of the OEC's catalytic cycle. The findings address unresolved questions about photosynthetic water splitting and introduce spatially resolved, low-frequency SERS as a chemically sensitive tool for interrogating homogeneous catalysis in operando.
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Affiliation(s)
- Andrew J Wilson
- Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
| | - Prashant K Jain
- Department of Chemistry , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Materials Research Lab , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States.,Department of Physics , University of Illinois at Urbana-Champaign , Urbana , Illinois 61801 , United States
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141
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Photosynthetic water splitting by the Mn4Ca2+OX catalyst of photosystem II: its structure, robustness and mechanism. Q Rev Biophys 2018; 50:e13. [PMID: 29233225 DOI: 10.1017/s0033583517000105] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
The biological energy cycle of our planet is driven by photosynthesis whereby sunlight is absorbed by chlorophyll and other accessory pigments. The excitation energy is then efficiently transferred to a reaction centre where charge separation occurs in a few picoseconds. In the case of photosystem II (PSII), the energy of the charge transfer state is used to split water into oxygen and reducing equivalents. This is accomplished by the relatively low energy content of four photons of visible light. PSII is a large multi-subunit membrane protein complex embedded in the lipid environment of the thylakoid membranes of plants, algae and cyanobacteria. Four high energy electrons, together with four protons (4H+), are used to reduce plastoquinone (PQ), the terminal electron acceptor of PSII, to plastoquinol (PQH2). PQH2 passes its reducing equivalents to an electron transfer chain which feeds into photosystem I (PSI) where they gain additional reducing potential from a second light reaction which is necessary to drive CO2 reduction. The catalytic centre of PSII consists of a cluster of four Mn ions and a Ca2+ linked by oxo bonds. In addition, there are seven amino acid ligands. In this Article, I discuss the structure of this metal cluster, its stability and the probability that an acid-base (nucleophilic-electrophilic) mechanism catalyses the water splitting reaction on the surface of the metal-cluster. Evidence for this mechanism is presented from studies on water splitting catalysts consisting of organo-complexes of ruthenium and manganese and also by comparison with the enzymology of carbon monoxide dehydrogenase (CODH). Finally the relevance of our understanding of PSII is discussed in terms of artificial photosynthesis with emphasis on inorganic water splitting catalysts as oxygen generating photoelectrodes.
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142
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Shoji M, Isobe H, Shigeta Y, Nakajima T, Yamaguchi K. Nonadiabatic one-electron transfer mechanism for the O–O bond formation in the oxygen-evolving complex of photosystem II. Chem Phys Lett 2018. [DOI: 10.1016/j.cplett.2018.02.056] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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143
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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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144
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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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145
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Su XJ, Zheng C, Hu QQ, Du HY, Liao RZ, Zhang MT. Bimetallic cooperative effect on O–O bond formation: copper polypyridyl complexes as water oxidation catalyst. Dalton Trans 2018; 47:8670-8675. [DOI: 10.1039/c8dt01675e] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two is better than one. The bimetallic cooperation in a binuclear copper complex, compared with the corresponding mononuclear catalyst, can decrease the catalytic overpotential and improve the catalytic efficiency.
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Affiliation(s)
- Xiao-Jun Su
- Center of Basic Molecular Science (CBMS)
- Department of Chemistry
- Tsinghua University
- Beijing
- China
| | - Chu Zheng
- Center of Basic Molecular Science (CBMS)
- Department of Chemistry
- Tsinghua University
- Beijing
- China
| | - Qin-Qin Hu
- Center of Basic Molecular Science (CBMS)
- Department of Chemistry
- Tsinghua University
- Beijing
- China
| | - Hao-Yi Du
- Center of Basic Molecular Science (CBMS)
- Department of Chemistry
- Tsinghua University
- Beijing
- China
| | - Rong-Zhen Liao
- Key Laboratory of Material Chemistry for Energy Conversion and Storage
- Ministry of Education
- School of Chemistry and Chemical Engineering
- Huazhong University of Science and Technology
- Wuhan 430074
| | - Ming-Tian Zhang
- Center of Basic Molecular Science (CBMS)
- Department of Chemistry
- Tsinghua University
- Beijing
- China
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146
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Balamurugan M, Saravanan N, Ha H, Lee YH, Nam KT. Involvement of high-valent manganese-oxo intermediates in oxidation reactions: realisation in nature, nano and molecular systems. NANO CONVERGENCE 2018; 5:18. [PMID: 30101051 PMCID: PMC6061251 DOI: 10.1186/s40580-018-0150-5] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Accepted: 06/19/2018] [Indexed: 05/12/2023]
Abstract
Manganese plays multiple role in many biological redox reactions in which it exists in different oxidation states from Mn(II) to Mn(IV). Among them the high-valent manganese-oxo intermediate plays important role in the activity of certain enzymes and lessons from the natural system provide inspiration for new developments of artificial systems for a sustainable energy supply and various organic conversions. This review describes recent advances and key lessons learned from the nature on high-valent Mn-oxo intermediates. Also we focus on the elemental science developed from the natural system, how the novel strategies are realised in nano particles and molecular sites at heterogeneous and homogeneous reaction conditions respectively. Finally, perspectives on the utilisation of the high-valent manganese-oxo species towards other organic reactions are proposed.
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Affiliation(s)
- Mani Balamurugan
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Natarajan Saravanan
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Heonjin Ha
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Yoon Ho Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul, 151-744 South Korea
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147
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Siegbahn PEM. The S2 to S3 transition for water oxidation in PSII (photosystem II), revisited. Phys Chem Chem Phys 2018; 20:22926-22931. [DOI: 10.1039/c8cp03720e] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The formation of O2 from water requires four transitions, each one after the absorption of one light flash.
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Affiliation(s)
- Per E. M. Siegbahn
- Department of Organic Chemistry
- Arrhenius Laboratory
- Stockholm University
- Stockholm
- Sweden
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148
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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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149
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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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150
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Siegbahn PE. Computational investigations of S 3 structures related to a recent X-ray free electron laser study. Chem Phys Lett 2017. [DOI: 10.1016/j.cplett.2017.08.050] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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