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Hyperfine Decoupling of ESR Spectra Using Wavelet Transform. MAGNETOCHEMISTRY 2022. [PMID: 37475982 PMCID: PMC10357921 DOI: 10.3390/magnetochemistry8030032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The objective of spectral analysis is to resolve and extract relevant features from experimental data in an optimal fashion. In continuous-wave (cw) electron spin resonance (ESR) spectroscopy, both g values of a paramagnetic center and hyperfine splitting (A) caused by its interaction with neighboring magnetic nuclei in a molecule provide important structural and electronic information. However, in the presence of g- and/or A-anisotropy and/or large number of resonance lines, spectral analysis becomes highly challenging. Either high-resolution experimental techniques are employed to resolve the spectra in those cases or a range of suitable ESR frequencies are used in combination with simulations to identify the corresponding g and A values. In this work, we present a wavelet transform technique in resolving both simulated and experimental cw-ESR spectra by separating the hyperfine and super-hyperfine components. We exploit the multiresolution property of wavelet transforms that allow the separation of distinct features of a spectrum based on simultaneous analysis of spectrum and its varying frequency. We retain the wavelet components that stored the hyperfine and/or super-hyperfine features, while eliminating the wavelet components representing the remaining spectrum. We tested the method on simulated cases of metal–ligand adducts at L-, S-, and X-band frequencies, and showed that extracted g values, hyperfine and super-hyperfine coupling constants from simulated spectra, were in excellent agreement with the values of those parameters used in the simulations. For the experimental case of a copper(II) complex with distorted octahedral geometry, the method was able to extract g and hyperfine coupling constant values, and revealed features that were buried in the overlapped spectra.
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Taguchi S, Noguchi T, Mino H. Molecular Structure of the S2 State with a g = 5 Signal in the Oxygen Evolving Complex of Photosystem II. J Phys Chem B 2020; 124:5531-5537. [DOI: 10.1021/acs.jpcb.0c02913] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Shota Taguchi
- Division of Material Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Aichi, Japan
| | - Takumi Noguchi
- Division of Material Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Aichi, Japan
| | - Hiroyuki Mino
- Division of Material Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Aichi, Japan
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Mino H, Nagashima H. Orientation of Ligand Field for Dangling Manganese in Photosynthetic Oxygen-Evolving Complex of Photosystem II. J Phys Chem B 2019; 124:128-133. [DOI: 10.1021/acs.jpcb.9b10817] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Hiroyuki Mino
- Division of Material Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Aichi, Japan
| | - Hiroki Nagashima
- Division of Material Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, 464-8602 Nagoya, Aichi, Japan
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Lubitz W, Chrysina M, Cox N. Water oxidation in photosystem II. PHOTOSYNTHESIS RESEARCH 2019; 142:105-125. [PMID: 31187340 PMCID: PMC6763417 DOI: 10.1007/s11120-019-00648-3] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 05/20/2019] [Indexed: 05/18/2023]
Abstract
Biological water oxidation, performed by a single enzyme, photosystem II, is a central research topic not only in understanding the photosynthetic apparatus but also for the development of water splitting catalysts for technological applications. Great progress has been made in this endeavor following the report of a high-resolution X-ray crystallographic structure in 2011 resolving the cofactor site (Umena et al. in Nature 473:55-60, 2011), a tetra-manganese calcium complex. The electronic properties of the protein-bound water oxidizing Mn4OxCa complex are crucial to understand its catalytic activity. These properties include: its redox state(s) which are tuned by the protein matrix, the distribution of the manganese valence and spin states and the complex interactions that exist between the four manganese ions. In this short review we describe how magnetic resonance techniques, particularly EPR, complemented by quantum chemical calculations, have played an important role in understanding the electronic structure of the cofactor. Together with isotope labeling, these techniques have also been instrumental in deciphering the binding of the two substrate water molecules to the cluster. These results are briefly described in the context of the history of biological water oxidation with special emphasis on recent work using time resolved X-ray diffraction with free electron lasers. It is shown that these data are instrumental for developing a model of the biological water oxidation cycle.
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Affiliation(s)
- Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, Mülheim/Ruhr, Germany
| | - Maria Chrysina
- Max-Planck-Institut für Chemische Energiekonversion, Mülheim/Ruhr, Germany
| | - Nicholas Cox
- Research School of Chemistry, The Australian National University, Canberra, Australia
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Nagashima H, Kawaoka S, Matsui Y, Tachikawa T, Ikeda H, Kobori Y. Time-Resolved EPR Study on Singlet-Fission Induced Quintet Generation and Subsequent Triplet Dissociation in TIPS-Phenyl-Tetracene Aggregates. J PHOTOPOLYM SCI TEC 2018. [DOI: 10.2494/photopolymer.31.163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Hiroki Nagashima
- Laser Molecular Photoscience Laboratory, Molecular Photoscience Research Center, Kobe University
| | - Shuhei Kawaoka
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
| | - Yasunori Matsui
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
| | - Takashi Tachikawa
- Laser Molecular Photoscience Laboratory, Molecular Photoscience Research Center, Kobe University
- Department of Chemistry, Graduate School of Science, Kobe University
| | - Hiroshi Ikeda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University
| | - Yasuhiro Kobori
- Laser Molecular Photoscience Laboratory, Molecular Photoscience Research Center, Kobe University
- Department of Chemistry, Graduate School of Science, Kobe University
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Nagashima H, Asada M, Mino H. Magnetic structure of manganese cluster in photosystem II investigated by electron paramagnetic resonance. Biophys Physicobiol 2018; 15:45-50. [PMID: 29607279 PMCID: PMC5873039 DOI: 10.2142/biophysico.15.0_45] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 01/08/2018] [Indexed: 12/01/2022] Open
Abstract
The electronic structure of manganese (Mn) cluster in photosystem II was investigated by electron paramagnetic resonance (EPR) spectroscopy. In order to determine the spin density distribution in magnetically coupled Mn in the S2 state Mn cluster, pulsed electron–electron double resonance (PELDOR) measurement was performed. The local environment of the Mn cluster was investigated by electron-nuclear double resonance (ENDOR). Using spin projections determined by PELDOR, ENDOR signals were assigned to the water molecules ligated to the Mn cluster. The location of a high-affinity Mn2+ site in apo-photosystem II, which is the initial site of photoactivation of the Mn cluster, was determined by PELDOR.
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Affiliation(s)
- Hiroki Nagashima
- Division of Material Science (Physics), Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Mizue Asada
- Division of Material Science (Physics), Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
| | - Hiroyuki Mino
- Division of Material Science (Physics), Graduate School of Science, Nagoya University, Nagoya, Aichi 464-8602, Japan
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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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Hasegawa M, Nagashima H, Minobe R, Tachikawa T, Mino H, Kobori Y. Regulated Electron Tunneling of Photoinduced Primary Charge-Separated State in the Photosystem II Reaction Center. J Phys Chem Lett 2017; 8:1179-1184. [PMID: 28240917 DOI: 10.1021/acs.jpclett.7b00044] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
In initial events of the photosynthesis by higher plants, the photosystem II (PSII) generates photoinduced primary charge-separated (CS) state composed of reduced pheophytin (PheoD1-•) and oxidized special pair (P+•) in chlorophyll a (Chla) PD1/PD2 in the D1/D2 heterodimer, ultimately leading to the water oxidation at the oxygen-evolving Mn4CaO5 cluster by P+•. To understand the mechanism of the efficient generation of initially localized CS state (PD1+• PheoD1-•), we have characterized cofactor geometries and electronic coupling of the photoinduced primary CS state in quinone prereduced membrane of PSII from spinach using the time-resolved electron paramagnetic resonance method. It has been revealed that the electronic coupling between the charges is significantly weak in the CS state separated by 1.5 nm, showing the importance of regulated cofactor-cofactor electronic interaction between a vinyl substituent in PheoD1 and an accessory chlorophyll to inhibit the energy-wasting charge recombination after the primary electron-transfer processes.
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Affiliation(s)
- Masashi Hasegawa
- Department of Chemistry, Graduate School of Science, Kobe University , 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
| | - Hiroki Nagashima
- Division of Materials Science (Physics), Graduate School of Science, Nagoya University , Furocho, Chikusa, Nagoya 464-8602, Japan
| | - Reina Minobe
- Department of Chemistry, Graduate School of Science, Kobe University , 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
| | - Takashi Tachikawa
- Department of Chemistry, Graduate School of Science, Kobe University , 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
- Laser Molecular Photoscience Laboratory, Molecular Photoscience Research Center, Kobe University , 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
| | - Hiroyuki Mino
- Division of Materials Science (Physics), Graduate School of Science, Nagoya University , Furocho, Chikusa, Nagoya 464-8602, Japan
| | - Yasuhiro Kobori
- Department of Chemistry, Graduate School of Science, Kobe University , 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
- Laser Molecular Photoscience Laboratory, Molecular Photoscience Research Center, Kobe University , 1-1 Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
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Nagashima H, Mino H. Location of Methanol on the S 2 State Mn Cluster in Photosystem II Studied by Proton Matrix Electron Nuclear Double Resonance. J Phys Chem Lett 2017; 8:621-625. [PMID: 28099021 DOI: 10.1021/acs.jpclett.7b00110] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Proton matrix electron nuclear double resonance (ENDOR) spectroscopy was performed to specify the location of the methanol molecule near the manganese cluster in photosystem II. Comparison of the ENDOR spectra in the presence of CH3OH and CD3OH revealed two pairs of hyperfine couplings, 1.2 MHz for A⊥ and 2.5 MHz for A//, arising from the methyl group in methanol. On the basis of the crystal structure, the possible location of methanol close to the manganese cluster was discussed.
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Affiliation(s)
- Hiroki Nagashima
- Division of Material Science, Graduate School of Science, Nagoya University , Furo-cho, Chikusa-ku, 464-8602 Nagoya, Aichi, Japan
| | - Hiroyuki Mino
- Division of Material Science, Graduate School of Science, Nagoya University , Furo-cho, Chikusa-ku, 464-8602 Nagoya, Aichi, Japan
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Nagashima H, Nakajima Y, Shen JR, Mino H. Proton Matrix ENDOR Studies on Ca2+-depleted and Sr2+-substituted Manganese Cluster in Photosystem II. J Biol Chem 2015; 290:28166-28174. [PMID: 26438823 DOI: 10.1074/jbc.m115.675496] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Indexed: 01/08/2023] Open
Abstract
Proton matrix ENDOR spectra were measured for Ca(2+)-depleted and Sr(2+)-substituted photosystem II (PSII) membrane samples from spinach and core complexes from Thermosynechococcus vulcanus in the S2 state. The ENDOR spectra obtained were similar for untreated PSII from T. vulcanus and spinach, as well as for Ca(2+)-containing and Sr(2+)-substituted PSII, indicating that the proton arrangements around the manganese cluster in cyanobacterial and higher plant PSII and Ca(2+)-containing and Sr(2+)-substituted PSII are similar in the S2 state, in agreement with the similarity of the crystal structure of both Ca(2+)-containing and Sr(2+)-substituted PSII in the S1 state. Nevertheless, slightly different hyperfine separations were found between Ca(2+)-containing and Sr(2+)-substituted PSII because of modifications of the water protons ligating to the Sr(2+) ion. Importantly, Ca(2+) depletion caused the loss of ENDOR signals with a 1.36-MHz separation because of the loss of the water proton W4 connecting Ca(2+) and YZ directly. With respect to the crystal structure and the functions of Ca(2+) in oxygen evolution, it was concluded that the roles of Ca(2+) and Sr(2+) involve the maintenance of the hydrogen bond network near the Ca(2+) site and electron transfer pathway to the manganese cluster.
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Affiliation(s)
- Hiroki Nagashima
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8602, Japan
| | - Yoshiki Nakajima
- Photosynthesis Research Center, Graduate School of Natural Science and Technology/Faculty of Science, Okayama University, Okayama 700-8530, Japan
| | - Jian-Ren Shen
- Photosynthesis Research Center, Graduate School of Natural Science and Technology/Faculty of Science, Okayama University, Okayama 700-8530, Japan
| | - Hiroyuki Mino
- Graduate School of Science, Nagoya University, Furo-cho, Chikusa, Nagoya, 464-8602, Japan.
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Lohmiller T, Krewald V, Navarro MP, Retegan M, Rapatskiy L, Nowaczyk MM, Boussac A, Neese F, Lubitz W, Pantazis DA, Cox N. Structure, ligands and substrate coordination of the oxygen-evolving complex of photosystem II in the S2 state: a combined EPR and DFT study. Phys Chem Chem Phys 2014; 16:11877-92. [DOI: 10.1039/c3cp55017f] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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Kurashige Y, Saitow M, Chalupský J, Yanai T. Radical O–O coupling reaction in diferrate-mediated water oxidation studied using multireference wave function theory. Phys Chem Chem Phys 2014; 16:11988-99. [DOI: 10.1039/c3cp55225j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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