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Cutsail III GE, DeBeer S. Challenges and Opportunities for Applications of Advanced X-ray Spectroscopy in Catalysis Research. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01016] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- George E. Cutsail III
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
- Institute of Inorganic Chemistry, University of Duisburg-Essen, Universitätsstr. 5-7, 45117 Essen, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
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2
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Kalendra V, Reiss KM, Banerjee G, Ghosh I, Baldansuren A, Batista VS, Brudvig GW, Lakshmi KV. Binding of the substrate analog methanol in the oxygen-evolving complex of photosystem II in the D1-N87A genetic variant of cyanobacteria. Faraday Discuss 2022; 234:195-213. [PMID: 35147155 DOI: 10.1039/d1fd00094b] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The solar water-splitting protein complex, photosystem II (PSII), catalyzes one of the most energetically demanding reactions in nature by using light energy to drive a catalyst capable of oxidizing water. The water oxidation reaction is catalyzed at the Mn4Ca-oxo cluster in the oxygen-evolving complex (OEC), which cycles through five light-driven S-state intermediates (S0-S4). A detailed mechanism of the reaction remains elusive as it requires knowledge of the delivery and binding of substrate water in the higher S-state intermediates. In this study, we use two-dimensional (2D) hyperfine sublevel correlation spectroscopy, in conjunction with quantum mechanics/molecular mechanics (QM/MM) and density functional theory (DFT), to probe the binding of the substrate analog, methanol, in the S2 state of the D1-N87A variant of PSII from Synechocystis sp. PCC 6803. The results indicate that the size and specificity of the "narrow" channel is altered in D1-N87A PSII, allowing for the binding of deprotonated 13C-labeled methanol at the Mn4(IV) ion of the catalytic cluster in the S2 state. This has important implications on the mechanistic models for water oxidation in PSII.
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Affiliation(s)
- Vidmantas Kalendra
- Department of Chemistry and Chemical Biology, The Baruch '60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA.
| | - Krystle M Reiss
- Department of Chemistry, Yale University, New Haven, Connecticut, 06520, USA.
| | - Gourab Banerjee
- Department of Chemistry, Yale University, New Haven, Connecticut, 06520, USA.
| | - Ipsita Ghosh
- Department of Chemistry, Yale University, New Haven, Connecticut, 06520, USA.
| | - Amgalanbaatar Baldansuren
- Department of Chemistry and Chemical Biology, The Baruch '60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA.
| | - Victor S Batista
- Department of Chemistry, Yale University, New Haven, Connecticut, 06520, USA.
| | - Gary W Brudvig
- Department of Chemistry, Yale University, New Haven, Connecticut, 06520, USA.
| | - K V Lakshmi
- Department of Chemistry and Chemical Biology, The Baruch '60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, New York, 12180, USA.
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3
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Suga M, Shimada A, Akita F, Shen JR, Tosha T, Sugimoto H. Time-resolved studies of metalloproteins using X-ray free electron laser radiation at SACLA. Biochim Biophys Acta Gen Subj 2019; 1864:129466. [PMID: 31678142 DOI: 10.1016/j.bbagen.2019.129466] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 10/02/2019] [Accepted: 10/04/2019] [Indexed: 01/12/2023]
Abstract
BACKGROUND The invention of the X-ray free-electron laser (XFEL) has provided unprecedented new opportunities for structural biology. The advantage of XFEL is an intense pulse of X-rays and a very short pulse duration (<10 fs) promising a damage-free and time-resolved crystallography approach. SCOPE OF REVIEW Recent time-resolved crystallographic analyses in XFEL facility SACLA are reviewed. Specifically, metalloproteins involved in the essential reactions of bioenergy conversion including photosystem II, cytochrome c oxidase and nitric oxide reductase are described. MAJOR CONCLUSIONS XFEL with pump-probe techniques successfully visualized the process of the reaction and the dynamics of a protein. Since the active center of metalloproteins is very sensitive to the X-ray radiation, damage-free structures obtained by XFEL are essential to draw mechanistic conclusions. Methods and tools for sample delivery and reaction initiation are key for successful measurement of the time-resolved data. GENERAL SIGNIFICANCE XFEL is at the center of approaches to gain insight into complex mechanism of structural dynamics and the reactions catalyzed by biological macromolecules. Further development has been carried out to expand the application of time-resolved X-ray crystallography. This article is part of a Special Issue entitled Novel measurement techniques for visualizing 'live' protein molecules.
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Affiliation(s)
- Michihiro Suga
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima Naka, Okayama 700-8530, Japan..
| | - Atsuhiro Shimada
- Graduate School of Applied Biological Sciences and Faculty of Applied Biological Sciences, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan..
| | - Fusamichi Akita
- Research Institute for Interdisciplinary Science and Graduate School of Natural Science and Technology, Okayama University, 3-1-1 Tsushima Naka, 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, Okayama 700-8530, Japan
| | - Takehiko Tosha
- Synchrotron Radiation Life Science Instrumentation Team, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan
| | - Hiroshi Sugimoto
- Synchrotron Radiation Life Science Instrumentation Team, RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo, Hyogo 679-5148, Japan..
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4
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Mn(acac) 2 and Mn(acac) 3 complexes, a theoretical modeling of their L 2,3 -edges X-ray absorption spectra. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.07.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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5
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A DFT/B3LYP study of the mechanisms of the O 2 formation reaction catalyzed by the [(terpy)(H 2O)Mn III(O) 2Mn IV(OH 2)(terpy)](NO 3) 3 complex: A paradigm for photosystem II. J Inorg Biochem 2017; 171:52-66. [PMID: 28365435 DOI: 10.1016/j.jinorgbio.2017.02.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 01/28/2017] [Accepted: 02/17/2017] [Indexed: 11/20/2022]
Abstract
We present a theoretical study of the reaction pathway for dioxygen molecular formation catalyzed by the [(terpy)(H2O)MnIII(O)2MnIV(OH2) (terpy)](NO3)3 (terpy=2,2':6',2″-terpyridine) complex based on DFT-B3LYP calculations. In the initial state of the reaction, a partial oxido radical (0.44 spins) is formed ligated to Mn. This radical is involved in a nucleophylic attack by bulk water in the OO bond reaction formation step, in which the oxido fractional unpaired electron is delocalized toward the outermost Mn of the μ-oxo bridge, instead of the ligated Mn center. The reaction then follows with a series of proton-coupled electron transfer steps, in which the oxidation state, as well as the bond strength of the OO moiety increase, while the OOMn(1) bond gets weaker until O2 is released. In this model, basic acetate ions from the buffer solution capture protons in the proton-transfer steps. In each step there is reduction of the OOMn(1) binding strength, with concomitant increase of the OO bond strength, which culminates with the release of O2 in the last step. This last step is entropy driven, while formation of hydroperoxide and superoxide moieties is enthalpy driven. According with experiments, the rate-limiting step is the double oxidation of Mn(IV,III) or peroxymonosulfate binding, which occur prior to the OO bond formation step. This supports our findings that the barriers of all intermediate steps are below the experimental barrier of 19-21kcal/mol. The implications of these findings for understanding photosynthetic water-splitting catalysis are also discussed.
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6
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Jung U, Elsen A, Li Y, Smith JG, Small MW, Stach EA, Frenkel AI, Nuzzo RG. Comparative in Operando Studies in Heterogeneous Catalysis: Atomic and Electronic Structural Features in the Hydrogenation of Ethylene over Supported Pd and Pt Catalysts. ACS Catal 2015. [DOI: 10.1021/cs501846g] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Ulrich Jung
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Annika Elsen
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Yuanyuan Li
- Department of Physics, Yeshiva University, New York, New York 10016, United States
| | - Jeremy G. Smith
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Matthew W. Small
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
| | - Eric A. Stach
- Center for Functional Nanomaterials, Brookhaven National Laboratory, Upton, New York 11973, United States
| | - Anatoly I. Frenkel
- Department of Physics, Yeshiva University, New York, New York 10016, United States
| | - Ralph G. Nuzzo
- Department of Chemistry, University of Illinois, Urbana, Illinois 61801, United States
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7
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Frenkel AI, van Bokhoven JA. X-ray spectroscopy for chemical and energy sciences: the case of heterogeneous catalysis. JOURNAL OF SYNCHROTRON RADIATION 2014; 21:1084-1089. [PMID: 25177997 DOI: 10.1107/s1600577514014854] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2014] [Accepted: 06/23/2014] [Indexed: 06/03/2023]
Abstract
Heterogeneous catalysis is the enabling technology for much of the current and future processes relevant for energy conversion and chemicals synthesis. The development of new materials and processes is greatly helped by the understanding of the catalytic process at the molecular level on the macro/micro-kinetic time scale and on that of the actual bond breaking and bond making. The performance of heterogeneous catalysts is inherently the average over the ensemble of active sites. Much development aims at unravelling the structure of the active site; however, in general, these methods yield the ensemble-average structure. A benefit of X-ray-based methods is the large penetration depth of the X-rays, enabling in situ and operando measurements. The potential of X-ray absorption and emission spectroscopy methods (XANES, EXAFS, HERFD, RIXS and HEROS) to directly measure the structure of the catalytically active site at the single nanoparticle level using nanometer beams at diffraction-limited storage ring sources is highlighted. The use of pump-probe schemes coupled with single-shot experiments will extend the time range from the micro/macro-kinetic time domain to the time scale of bond breaking and making.
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Affiliation(s)
- Anatoly I Frenkel
- Department of Physics, Yeshiva University, 245 Lexington Avenue, New York, NY 10016, USA
| | - Jeroen A van Bokhoven
- Department of Chemistry and Bioengineering, ETH Zürich, Wolfgang-Paulistrasse 10, Zürich 8093, Switzerland
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8
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Yano J, Yachandra V. Mn4Ca cluster in photosynthesis: where and how water is oxidized to dioxygen. Chem Rev 2014; 114:4175-205. [PMID: 24684576 PMCID: PMC4002066 DOI: 10.1021/cr4004874] [Citation(s) in RCA: 482] [Impact Index Per Article: 48.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Indexed: 12/25/2022]
Affiliation(s)
- Junko Yano
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
| | - Vittal Yachandra
- Physical Biosciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720
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9
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Chen LX, Zhang X, Shelby ML. Recent advances on ultrafast X-ray spectroscopy in the chemical sciences. Chem Sci 2014. [DOI: 10.1039/c4sc01333f] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Molecular snapshots obtained by ultrafast X-ray spectroscopy reveal new insight into fundamental reaction mechanisms at single electron and atomic levels.
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Affiliation(s)
- L. X. Chen
- Chemical Sciences and Engineering Division
- Argonne National Laboratory
- Lemont, USA
- Department of Chemistry
- Northwestern University
| | - X. Zhang
- X-ray Science Division
- Advance Photon Source
- Argonne National Laboratory
- Lemont, USA
| | - M. L. Shelby
- Department of Chemistry
- Northwestern University
- Evanston, USA
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10
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Bordiga S, Groppo E, Agostini G, van Bokhoven JA, Lamberti C. Reactivity of Surface Species in Heterogeneous Catalysts Probed by In Situ X-ray Absorption Techniques. Chem Rev 2013; 113:1736-850. [DOI: 10.1021/cr2000898] [Citation(s) in RCA: 488] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Silvia Bordiga
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Elena Groppo
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Giovanni Agostini
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
| | - Jeroen A. van Bokhoven
- ETH Zurich, Institute for Chemical and Bioengineering, HCI E127 8093 Zurich, Switzerland
- Laboratory for Catalysis and Sustainable Chemistry (LSK) Swiss Light Source, Paul Scherrer Instituteaul Scherrer Institute, Villigen, Switzerland
| | - Carlo Lamberti
- Department of Chemistry and NIS Centre of Excellence, Università di Torino and INSTM Reference Center, Via P. Giuria 7, 10125 Torino, Italy
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11
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Cox N, Messinger J. Reflections on substrate water and dioxygen formation. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2013; 1827:1020-30. [PMID: 23380392 DOI: 10.1016/j.bbabio.2013.01.013] [Citation(s) in RCA: 204] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 01/23/2013] [Accepted: 01/25/2013] [Indexed: 11/30/2022]
Abstract
This brief article aims at presenting a concise summary of all experimental findings regarding substrate water-binding to the Mn4CaO5 cluster in photosystem II. Mass spectrometric and spectroscopic results are interpreted in light of recent structural information of the water oxidizing complex obtained by X-ray crystallography, spectroscopy and theoretical modeling. Within this framework current proposals for the mechanism of photosynthetic water-oxidation are evaluated. This article is part of a Special Issue entitled: Metals in Bioenergetics and Biomimetics Systems.
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Affiliation(s)
- Nicholas Cox
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstrasse 34-36, Mülheim an der Ruhr, Germany
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12
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Chatterjee R, Milikisiyants S, Lakshmi KV. Two-dimensional 14N HYSCORE spectroscopy of the coordination geometry of ligands in dimanganese di-μ-oxo mimics of the oxygen evolving complex of photosystem II. Phys Chem Chem Phys 2012; 14:7090-7. [DOI: 10.1039/c2cp40416h] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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13
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Zhu G, Glass EN, Zhao C, Lv H, Vickers JW, Geletii YV, Musaev DG, Song J, Hill CL. A nickel containing polyoxometalate water oxidation catalyst. Dalton Trans 2012; 41:13043-9. [DOI: 10.1039/c2dt30331k] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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14
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Siegbahn PE, Himo F. The quantum chemical cluster approach for modeling enzyme reactions. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2011. [DOI: 10.1002/wcms.13] [Citation(s) in RCA: 166] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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15
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Martínez JI, Yruela I, Picorel R, Alonso PJ. 1H Hyperfine Interactions in the Mn-Cluster of Photosystem II in the S2 State Detected by Hyperfine Sublevel Correlation Spectroscopy. J Phys Chem B 2010; 114:15345-53. [DOI: 10.1021/jp107017f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Jesús I. Martínez
- Instituto de Ciencia de Materiales de Aragón (ICMA), Consejo Superior de Investigaciones Científicas-Universidad de Zaragoza, C/Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas, Avda. Montañana, 1005, E-50059 Zaragoza, Spain
| | - Inmaculada Yruela
- Instituto de Ciencia de Materiales de Aragón (ICMA), Consejo Superior de Investigaciones Científicas-Universidad de Zaragoza, C/Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas, Avda. Montañana, 1005, E-50059 Zaragoza, Spain
| | - Rafael Picorel
- Instituto de Ciencia de Materiales de Aragón (ICMA), Consejo Superior de Investigaciones Científicas-Universidad de Zaragoza, C/Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas, Avda. Montañana, 1005, E-50059 Zaragoza, Spain
| | - Pablo J. Alonso
- Instituto de Ciencia de Materiales de Aragón (ICMA), Consejo Superior de Investigaciones Científicas-Universidad de Zaragoza, C/Pedro Cerbuna 12, E-50009 Zaragoza, Spain, and Estación Experimental de Aula Dei, Consejo Superior de Investigaciones Científicas, Avda. Montañana, 1005, E-50059 Zaragoza, Spain
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16
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Siegbahn PEM, Blomberg MRA. Quantum Chemical Studies of Proton-Coupled Electron Transfer in Metalloenzymes. Chem Rev 2010; 110:7040-61. [DOI: 10.1021/cr100070p] [Citation(s) in RCA: 169] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Per E. M. Siegbahn
- Department of Physics, AlbaNova University Center and Department of Biochemistry and Biophysics, Arrhenius Laboratory, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Margareta R. A. Blomberg
- Department of Physics, AlbaNova University Center and Department of Biochemistry and Biophysics, Arrhenius Laboratory, Stockholm University, SE-106 91, Stockholm, Sweden
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17
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Blomberg MR, Siegbahn PE. Quantum chemistry as a tool in bioenergetics. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2010; 1797:129-42. [DOI: 10.1016/j.bbabio.2009.10.004] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2009] [Revised: 10/09/2009] [Accepted: 10/13/2009] [Indexed: 11/16/2022]
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Dismukes GC, Brimblecombe R, Felton GAN, Pryadun RS, Sheats JE, Spiccia L, Swiegers GF. Development of bioinspired Mn4O4-cubane water oxidation catalysts: lessons from photosynthesis. Acc Chem Res 2009; 42:1935-43. [PMID: 19908827 DOI: 10.1021/ar900249x] [Citation(s) in RCA: 478] [Impact Index Per Article: 31.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hydrogen is the most promising fuel of the future owing to its carbon-free, high-energy content and potential to be efficiently converted into either electrical or thermal energy. The greatest technical barrier to accessing this renewable resource remains the inability to create inexpensive catalysts for the solar-driven oxidation of water. To date, the most efficient system that uses solar energy to oxidize water is the photosystem II water-oxidizing complex (PSII-WOC), which is found within naturally occurring photosynthetic organisms. The catalytic core of this enzyme is a CaMn(4)O(x) cluster, which is present in all known species of oxygenic phototrophs and has been conserved since the emergence of this type of photosynthesis about 2.5 billion years ago. The key features that facilitate the catalytic success of the PSII-WOC offer important lessons for the design of abiological water oxidation catalysts. In this Account, we examine the chemical principles that may govern the PSII-WOC by comparing the water oxidation capabilities of structurally related synthetic manganese-oxo complexes, particularly those with a cubical Mn(4)O(4) core ("cubanes"). We summarize this research, from the self-assembly of the first such clusters, through the elucidation of their mechanism of photoinduced rearrangement to release O(2), to recent advances highlighting their capability to catalyze sustained light-activated electrolysis of water. The [Mn(4)O(4)](6+) cubane core assembles spontaneously in solution from monomeric precursors or from [Mn(2)O(2)](3+) core complexes in the presence of metrically appropriate bidentate chelates, for example, diarylphosphinates (ligands of Ph(2)PO(2)(-) and 4-phenyl-substituted derivatives), which bridge pairs of Mn atoms on each cube face (Mn(4)O(4)L(6)). The [Mn(4)O(4)](6+) core is enlarged relative to the [Mn(2)O(2)](3+) core, resulting in considerably weaker Mn-O bonds. Cubanes are ferocious oxidizing agents, stronger than analogous complexes with the [Mn(2)O(2)](3+) core, as demonstrated both by the range of substrates they dehydrogenate or oxygenate (unactivated alkanes, for example) and the 25% larger O-H bond enthalpy of the resulting mu(3)-OH bridge. The cubane core topology is structurally suited to releasing O(2), and it does so in high yield upon removal of one phosphinate by photoexcitation in the gas phase or thermal excitation in the solid state. This is quite unlike other Mn-oxo complexes and can be attributed to the elongated Mn-O bond lengths and low-energy transition state to the mu-peroxo precursor. The photoproduct, [Mn(4)O(2)L(5)](+), an intact nonplanar butterfly core complex, is poised for oxidative regeneration of the cubane core upon binding of two water molecules and coupling to an anode. Catalytic evolution of O(2) and protons from water exceeding 1000 turnovers can be readily achieved by suspending the oxidized cubane, [Mn(4)O(4)L(6)](+), into a proton-conducting membrane (Nafion) preadsorbed onto a conducting electrode and electroxidizing the photoreduced butterfly complexes by the application of an external bias. Catalytic water oxidation can be achieved using sunlight as the only source of energy by replacing the external electrical bias with redox coupling to a photoanode incorporating a Ru(bipyridyl) dye.
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Affiliation(s)
- G. Charles Dismukes
- Department of Chemistry & Chemical Biology, Waksman Institute, Rutgers University, Piscataway, New Jersey 08854
| | - Robin Brimblecombe
- School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540
| | - Greg A. N. Felton
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540
| | - Ruslan S. Pryadun
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540
| | - John E. Sheats
- Department of Chemistry, Princeton University, Princeton, New Jersey 08540
| | - Leone Spiccia
- School of Chemistry, Monash University, Wellington Road, Clayton, Victoria 3800, Australia
| | - Gerhard F. Swiegers
- Intelligent Polymer Research Institute, University of Wollongong, Wollongong, New South Wales 2522, Australia
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Siegbahn PEM. An Energetic Comparison of Different Models for the Oxygen Evolving Complex of Photosystem II. J Am Chem Soc 2009; 131:18238-9. [DOI: 10.1021/ja908712a] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Per E. M. Siegbahn
- Department of Physics, ALBA NOVA and Department of Biochemistry and Biophysics, Arrhenius Laboratory, Stockholm University, SE-106 91, Stockholm, Sweden
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20
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Sproviero EM, Newcomer MB, Gascón JA, Batista ER, Brudvig GW, Batista VS. The MoD-QM/MM methodology for structural refinement of photosystem II and other biological macromolecules. PHOTOSYNTHESIS RESEARCH 2009; 102:455-470. [PMID: 19633920 PMCID: PMC2954272 DOI: 10.1007/s11120-009-9467-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2008] [Accepted: 06/25/2009] [Indexed: 05/28/2023]
Abstract
Quantum mechanics/molecular mechanics (QM/MM) hybrid methods are currently the most powerful computational tools for studies of structure/function relations and structural refinement of macrobiomolecules (e.g., proteins and nucleic acids). These methods are highly efficient, since they implement quantum chemistry techniques for modeling only the small part of the system (QM layer) that undergoes chemical modifications, charge transfer, etc., under the influence of the surrounding environment. The rest of the system (MM layer) is described in terms of molecular mechanics force fields, assuming that its influence on the QM layer can be roughly decomposed in terms of electrostatic interactions and steric hindrance. Common limitations of QM/MM methods include inaccuracies in the MM force fields, when polarization effects are not explicitly considered, and the approximate treatment of electrostatic interactions at the boundaries between QM and MM layers. This article reviews recent advances in the development of computational protocols that allow for rigorous modeling of electrostatic interactions in extended systems beyond the common limitations of QM/MM hybrid methods. We focus on the moving-domain QM/MM (MoD-QM/MM) methodology that partitions the system into many molecular domains and obtains the electrostatic and structural properties of the whole system from an iterative self-consistent treatment of the constituent molecular fragments. We illustrate the MoD-QM/MM method as applied to the description of photosystem II as well as in conjunction with the application of spectroscopically constrained QM/MM optimization methods, based on high-resolution spectroscopic data (extended X-ray absorption fine structure spectra, and exchange coupling constants).
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Affiliation(s)
- Eduardo M. Sproviero
- Yale University, Department of Chemistry, P. O. Box 208107, New Haven Connecticut 06520-8107 USA
| | - Michael B. Newcomer
- Yale University, Department of Chemistry, P. O. Box 208107, New Haven Connecticut 06520-8107 USA
| | | | - Enrique R. Batista
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545
| | - Gary W. Brudvig
- Yale University, Department of Chemistry, P. O. Box 208107, New Haven Connecticut 06520-8107 USA
| | - Victor S. Batista
- Yale University, Department of Chemistry, P. O. Box 208107, New Haven Connecticut 06520-8107 USA
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Srinivasan N, Golbeck JH. Protein–cofactor interactions in bioenergetic complexes: The role of the A1A and A1B phylloquinones in Photosystem I. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2009; 1787:1057-88. [DOI: 10.1016/j.bbabio.2009.04.010] [Citation(s) in RCA: 97] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2009] [Revised: 04/14/2009] [Accepted: 04/22/2009] [Indexed: 10/20/2022]
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Siegbahn PEM, Blomberg MRA. A combined picture from theory and experiments on water oxidation, oxygen reduction and proton pumping. Dalton Trans 2009:5832-40. [PMID: 19623382 DOI: 10.1039/b903007g] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In order to illustrate how theory and experiments can be combined, examples are taken from two projects that have been going on for a decade. The goal is to obtain the full mechanistic picture of water oxidation in photosystem II and proton pumping in cytochrome c oxidase. It is argued that for obtaining a complete description of these processes, both experiments and theoretical calculations are needed. It is obvious that there are aspects, which are out of reach for computations, but there are also key aspects that can not be obtained by experiments. This concerns very short-lived species but also, in the case of photosynthesis in particular, structural information that is presently out of reach. The main contributions from theory in the present cases, is for photosynthesis a mechanism for O-O bond formation including new and improved structures for all S-states, and for proton pumping a plausible and simple mechanism for proton gating. The examples also illustrate that sometimes rather qualitative experimental information can be of highest importance.
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Jaszewski AR, Stranger R, Pace RJ. The effect of Mn oxidation state on metal core electron excitations in manganese dimers: a time-dependent density functional investigation. Phys Chem Chem Phys 2009; 11:5634-42. [DOI: 10.1039/b900694j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Siegbahn PEM. A structure-consistent mechanism for dioxygen formation in photosystem II. Chemistry 2008; 14:8290-302. [PMID: 18680116 DOI: 10.1002/chem.200800445] [Citation(s) in RCA: 198] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
In recent DFT studies a new mechanism for O-O bond formation at the oxygen evolving center (OEC) in photosystem II has been suggested. With the structure of the S(4) state required for that mechanism, the structures of the lower S states are investigated herein by adding protons and electrons. A model was used including the full amino acids for the ones ligating the OEC, and in which the backbone positions were held fixed from the X-ray structure. The only charged second-shell ligand Arg357 was also included. An optimized structure for the S(1) state was reached with a large similarity to one of those suggested by EXAFS. A full catalytic cycle was derived which can rationalize the structural relaxation in the S(2) to S(3) transition, and the fact that only an electron leaves in the transition before. Water is suggested to bind to the OEC in the S(2) to S(3), and S(4) to S(0) transitions. A new possibility for water exchange is suggested from the final energy diagram. The optimal O-O bond formation occurs between an oxygen radical and an oxo ligand. The alternative mechanism, where the oxygen radical reacts with an external water, has a barrier about 20 kcal mol(-1) higher.
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Affiliation(s)
- Per E M Siegbahn
- Department of Physics, ALBA NOVA, Stockholm University, 106 91 Stockholm, Sweden.
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Barber J, Rutherford AW. Revealing how nature uses sunlight to split water. Introduction. Philos Trans R Soc Lond B Biol Sci 2008; 363:1125-8. [PMID: 17989004 DOI: 10.1098/rstb.2007.2227] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Affiliation(s)
- James Barber
- Wolfson Laboratories, Division of Molecular Biosciences, Imperial College London, London SW7 2AZ, UK.
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