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Oney-Hawthorne SD, Barondeau DP. Fe-S cluster biosynthesis and maturation: Mass spectrometry-based methods advancing the field. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2024; 1871:119784. [PMID: 38908802 DOI: 10.1016/j.bbamcr.2024.119784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/29/2024] [Revised: 04/25/2024] [Accepted: 06/10/2024] [Indexed: 06/24/2024]
Abstract
Iron‑sulfur (FeS) clusters are inorganic protein cofactors that perform essential functions in many physiological processes. Spectroscopic techniques have historically been used to elucidate details of FeS cluster type, their assembly and transfer, and changes in redox and ligand binding properties. Structural probes of protein topology, complex formation, and conformational dynamics are also necessary to fully understand these FeS protein systems. Recent developments in mass spectrometry (MS) instrumentation and methods provide new tools to investigate FeS cluster and structural properties. With the unique advantage of sampling all species in a mixture, MS-based methods can be utilized as a powerful complementary approach to probe native dynamic heterogeneity, interrogate protein folding and unfolding equilibria, and provide extensive insight into protein binding partners within an entire proteome. Here, we highlight key advances in FeS protein studies made possible by MS methodology and contribute an outlook for its role in the field.
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Affiliation(s)
| | - David P Barondeau
- Department of Chemistry, Texas A&M University, College Station, TX 77842, USA.
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2
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Hagen WR. Quantum Magnetism of the Iron Core in Ferritin Proteins-A Re-Evaluation of the Giant-Spin Model. Molecules 2024; 29:2254. [PMID: 38792115 PMCID: PMC11123763 DOI: 10.3390/molecules29102254] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2024] [Revised: 05/04/2024] [Accepted: 05/09/2024] [Indexed: 05/26/2024] Open
Abstract
The electron-electron, or zero-field interaction (ZFI) in the electron paramagnetic resonance (EPR) of high-spin transition ions in metalloproteins and coordination complexes, is commonly described by a simple spin Hamiltonian that is second-order in the spin S: H=D[Sz2-SS+1/3+E(Sx2-Sy2). Symmetry considerations, however, allow for fourth-order terms when S ≥ 2. In metalloprotein EPR studies, these terms have rarely been explored. Metal ions can cluster via non-metal bridges, as, for example, in iron-sulfur clusters, in which exchange interaction can result in higher system spin, and this would allow for sixth- and higher-order ZFI terms. For metalloproteins, these have thus far been completely ignored. Single-molecule magnets (SMMs) are multi-metal ion high spin complexes, in which the ZFI usually has a negative sign, thus affording a ground state level pair with maximal spin quantum number mS = ±S, giving rise to unusual magnetic properties at low temperatures. The description of EPR from SMMs is commonly cast in terms of the 'giant-spin model', which assumes a magnetically isolated system spin, and in which fourth-order, and recently, even sixth-order ZFI terms have been found to be required. A special version of the giant-spin model, adopted for scaling-up to system spins of order S ≈ 103-104, has been applied to the ubiquitous iron-storage protein ferritin, which has an internal core containing Fe3+ ions whose individual high spins couple in a way to create a superparamagnet at ambient temperature with very high system spin reminiscent to that of ferromagnetic nanoparticles. This scaled giant-spin model is critically evaluated; limitations and future possibilities are explicitly formulated.
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Affiliation(s)
- Wilfred R Hagen
- Department of Biotechnology, Delft University of Technology, Building 58, Van der Maasweg 9, 2629 HZ Delft, The Netherlands
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3
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Dombrowski JP, Kalendra V, Ziegler MS, Lakshmi KV, Bell AT, Tilley TD. M-Ge-Si thermolytic molecular precursors and models for germanium-doped transition metal sites on silica. Dalton Trans 2024; 53:7340-7349. [PMID: 38602311 DOI: 10.1039/d4dt00644e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2024]
Abstract
The synthesis, thermolysis, and surface organometallic chemistry of thermolytic molecular precursors based on a new germanosilicate ligand platform, -OGe[OSi(OtBu)3]3, is described. Use of this ligand is demonstrated with preparation of complexes containing the first-row transition metals Cr, Mn, and Fe. The thermolysis and grafting behavior of the synthesized complexes, Fe{OGe[OSi(OtBu)3]3}2 (FeGe), Mn{OGe[OSi(OtBu)3]3}2(THF)2 (MnGe) and Cr{OGe[OSi(OtBu)3]3}2(THF)2 (CrGe), was evaluated using a combination of thermogravimetric analysis; nuclear magnetic resonance (NMR), ultraviolet-visible (UV-Vis), and electron paramagnetic resonance (EPR) spectroscopies; and single-crystal X-ray diffraction (XRD). Grafting of the precursors onto SBA-15 mesoporous silica and subsequent calcination in air led to substantial changes in transition metal coordination environments and oxidation states, the implications of which are discussed in the context of low-coordinate and low oxidation state thermolytic molecular precursors.
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Affiliation(s)
- James P Dombrowski
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA
| | - Vidmantas Kalendra
- Department of Chemistry and Chemical Biology and The Baruch '60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Micah S Ziegler
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA
| | - K V Lakshmi
- Department of Chemistry and Chemical Biology and The Baruch '60 Center for Biochemical Solar Energy Research, Rensselaer Polytechnic Institute, Troy, NY 12180, USA
| | - Alexis T Bell
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA
- Department of Chemical and Biomolecular Engineering, University of California, Berkeley, 201 Gilman Hall, Berkeley, CA, USA
| | - T Don Tilley
- Department of Chemistry, University of California, Berkeley, Berkeley, CA, USA.
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA, USA
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4
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Duffus BR, Gauglitz M, Teutloff C, Leimkühler S. Redox potentials elucidate the electron transfer pathway of NAD +-dependent formate dehydrogenases. J Inorg Biochem 2024; 253:112487. [PMID: 38306887 DOI: 10.1016/j.jinorgbio.2024.112487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2023] [Revised: 01/16/2024] [Accepted: 01/16/2024] [Indexed: 02/04/2024]
Abstract
Metal-dependent, nicotine adenine dinucleotide (NAD+)-dependent formate dehydrogenases (FDHs) are complex metalloenzymes coupling biochemical transformations through intricate electron transfer pathways. Rhodobacter capsulatus FDH is a model enzyme for understanding coupled catalysis, in that reversible CO2 reduction and formate oxidation are linked to a flavin mononuclotide (FMN)-bound diaphorase module via seven iron-sulfur (FeS) clusters as a dimer of heterotetramers. Catalysis occurs at a bis-metal-binding pterin (Mo) binding two molybdopterin guanine dinucleotides (bis-MGD), a protein-based Cys residue and a participatory sulfido ligand. Insights regarding the proposed electron transfer mechanism between the bis-MGD and the FMN have been complicated by the discovery that an alternative pathway might occur via intersubunit electron transfer between two [4Fe4S] clusters within electron transfer distance. To clarify this difference, the redox potentials of the bis-MGD and the FeS clusters were determined via redox titration by EPR spectroscopy. Redox potentials for the bis-MGD cofactor and five of the seven FeS clusters could be assigned. Furthermore, substitution of the active site residue Lys295 with Ala resulted in altered enzyme kinetics, primarily due to a more negative redox potential of the A1 [4Fe4S] cluster. Finally, characterization of the monomeric FdsGBAD heterotetramer exhibited slightly decreased formate oxidation activity and similar iron-sulfur clusters reduced relative to the dimeric heterotetramer. Comparison of the measured redox potentials relative to structurally defined FeS clusters support a mechanism by which electron transfer occurs within a heterotetrameric unit, with the interfacial [4Fe4S] cluster serving as a structural component toward the integrity of the heterodimeric structure to drive efficient catalysis.
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Affiliation(s)
- Benjamin R Duffus
- Institute for Biochemistry and Biology, Molecular Enzymology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany
| | - Marcel Gauglitz
- Institute for Experimental Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin, Germany
| | - Christian Teutloff
- Institute for Experimental Physics, Free University of Berlin, Arnimallee 14, 14195 Berlin, Germany.
| | - Silke Leimkühler
- Institute for Biochemistry and Biology, Molecular Enzymology, University of Potsdam, Karl-Liebknecht-Strasse 24-25, 14476 Potsdam, Germany.
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5
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Qin Z, Wang Z, Kong F, Su J, Huang Z, Zhao P, Chen S, Zhang Q, Shi F, Du J. In situ electron paramagnetic resonance spectroscopy using single nanodiamond sensors. Nat Commun 2023; 14:6278. [PMID: 37805509 PMCID: PMC10560202 DOI: 10.1038/s41467-023-41903-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Accepted: 09/18/2023] [Indexed: 10/09/2023] Open
Abstract
An ultimate goal of electron paramagnetic resonance (EPR) spectroscopy is to analyze molecular dynamics in place where it occurs, such as in a living cell. The nanodiamond (ND) hosting nitrogen-vacancy (NV) centers will be a promising EPR sensor to achieve this goal. However, ND-based EPR spectroscopy remains elusive, due to the challenge of controlling NV centers without well-defined orientations inside a flexible ND. Here, we show a generalized zero-field EPR technique with spectra robust to the sensor's orientation. The key is applying an amplitude modulation on the control field, which generates a series of equidistant Floquet states with energy splitting being the orientation-independent modulation frequency. We acquire the zero-field EPR spectrum of vanadyl ions in aqueous glycerol solution with embedded single NDs, paving the way towards in vivo EPR.
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Affiliation(s)
- Zhuoyang Qin
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
| | - Zhecheng Wang
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
| | - Fei Kong
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China.
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China.
- Hefei National Laboratory, University of Science and Technology of China, Hefei, 230088, China.
| | - Jia Su
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
| | - Zhehua Huang
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
| | - Pengju Zhao
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
| | - Sanyou Chen
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
- School of Biomedical Engineering and Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, China
| | - Qi Zhang
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China
- School of Biomedical Engineering and Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, China
| | - Fazhan Shi
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China.
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China.
- Hefei National Laboratory, University of Science and Technology of China, Hefei, 230088, China.
- School of Biomedical Engineering and Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou, 215123, China.
| | - Jiangfeng Du
- CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei, 230026, China.
- CAS Center for Excellence in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, 230026, China.
- Hefei National Laboratory, University of Science and Technology of China, Hefei, 230088, China.
- School of Physics, Zhejiang University, Hangzhou, 310027, China.
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6
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Bimai O, Legrand P, Ravanat JL, Touati N, Zhou J, He N, Lénon M, Barras F, Fontecave M, Golinelli-Pimpaneau B. The thiolation of uridine 34 in tRNA, which controls protein translation, depends on a [4Fe-4S] cluster in the archaeum Methanococcus maripaludis. Sci Rep 2023; 13:5351. [PMID: 37005440 PMCID: PMC10067955 DOI: 10.1038/s41598-023-32423-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Accepted: 03/24/2023] [Indexed: 04/04/2023] Open
Abstract
Thiolation of uridine 34 in the anticodon loop of several tRNAs is conserved in the three domains of life and guarantees fidelity of protein translation. U34-tRNA thiolation is catalyzed by a complex of two proteins in the eukaryotic cytosol (named Ctu1/Ctu2 in humans), but by a single NcsA enzyme in archaea. We report here spectroscopic and biochemical experiments showing that NcsA from Methanococcus maripaludis (MmNcsA) is a dimer that binds a [4Fe-4S] cluster, which is required for catalysis. Moreover, the crystal structure of MmNcsA at 2.8 Å resolution shows that the [4Fe-4S] cluster is coordinated by three conserved cysteines only, in each monomer. Extra electron density on the fourth nonprotein-bonded iron most likely locates the binding site for a hydrogenosulfide ligand, in agreement with the [4Fe-4S] cluster being used to bind and activate the sulfur atom of the sulfur donor. Comparison of the crystal structure of MmNcsA with the AlphaFold model of the human Ctu1/Ctu2 complex shows a very close superposition of the catalytic site residues, including the cysteines that coordinate the [4Fe-4S] cluster in MmNcsA. We thus propose that the same mechanism for U34-tRNA thiolation, mediated by a [4Fe-4S]-dependent enzyme, operates in archaea and eukaryotes.
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Affiliation(s)
- Ornella Bimai
- Laboratoire de Chimie des Processus Biologiques, Collège de France, CNRS UMR 8229, Sorbonne Université, 11 Place Marcelin Berthelot, 75231, Paris Cedex 05, France
| | - Pierre Legrand
- Synchrotron SOLEIL, L'Orme des Merisiers, Saint Aubin BP48, 91198, Gif-sur-Yvette, France
| | - Jean-Luc Ravanat
- University of Grenoble Alpes, CEA, CNRS, IRIG, SyMMES, UMR 5819, 38000, Grenoble, France
| | - Nadia Touati
- IR CNRS Renard, Chimie-ParisTech, 11 rue Pierre et Marie Curie, 75005, Paris, France
| | - Jingjing Zhou
- Laboratoire de Chimie des Processus Biologiques, Collège de France, CNRS UMR 8229, Sorbonne Université, 11 Place Marcelin Berthelot, 75231, Paris Cedex 05, France
| | - Nisha He
- Laboratoire de Chimie des Processus Biologiques, Collège de France, CNRS UMR 8229, Sorbonne Université, 11 Place Marcelin Berthelot, 75231, Paris Cedex 05, France
| | - Marine Lénon
- Stress Adaptation and Metabolism in Enterobacteria Unit, Institut Pasteur, Université Paris Cité, UMR CNRS 6047, Paris, France
| | - Frédéric Barras
- Stress Adaptation and Metabolism in Enterobacteria Unit, Institut Pasteur, Université Paris Cité, UMR CNRS 6047, Paris, France
| | - Marc Fontecave
- Laboratoire de Chimie des Processus Biologiques, Collège de France, CNRS UMR 8229, Sorbonne Université, 11 Place Marcelin Berthelot, 75231, Paris Cedex 05, France
| | - Béatrice Golinelli-Pimpaneau
- Laboratoire de Chimie des Processus Biologiques, Collège de France, CNRS UMR 8229, Sorbonne Université, 11 Place Marcelin Berthelot, 75231, Paris Cedex 05, France.
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7
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Scheuchzer P, Syryamina VN, Zimmermann MB, Zeder C, Nyström L, Yulikov M, Moretti D. Ferric Pyrophosphate Forms Soluble Iron Coordination Complexes with Zinc Compounds and Solubilizing Agents in Extruded Rice and Predicts Increased Iron Solubility and Bioavailability in Young Women. J Nutr 2023; 153:636-644. [PMID: 36931746 PMCID: PMC10127525 DOI: 10.1016/j.tjnut.2022.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2022] [Revised: 12/03/2022] [Accepted: 12/14/2022] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Co-extrusion of ferric pyrophosphate (FePP) with solubilizers, citric acid/trisodium citrate (CA/TSC), or ethylenediaminetetraacetic acid (EDTA) sharply increases iron absorption. Whether this can protect against the inhibition of iron absorption by phytic acid (PA) is unclear. Sodium pyrophosphate (NaPP) may be a new enhancer of iron absorption from FePP. OBJECTIVES Our objectives were to 1) investigate the ligand coordination of iron, zinc, and solubilizers in extruded rice and test associations with iron solubility and absorption, 2) assess whether co-extrusion of FePP + CA/TSC rice can protect against inhibition of iron absorption by PA; 3) determine the effect of zinc oxide (ZnO) compared with zinc sulfate (ZnSO4), and 4) quantify iron absorption from FePP + NaPP rice. METHODS We produced labeled 57FePP rice cofortified with ZnSO4 and EDTA, CA/TSC or NaPP, and FePP + EDTA rice with ZnO. We used electron paramagnetic resonance (EPR) to characterize iron-ligand complexes. We measured in vitro iron solubility and fractional iron absorption (FIA) in young women (n = 21, age: 22 ± 2 y, BMI: 21.3 ± 1.5 kg/m2 geometric mean plasma ferritin, 28.5 μg/L) compared with ferrous sulfate (58FeSO4). FIA was compared by linear mixed-effect model analysis. RESULTS The addition of zinc and solubilizers created new iron coordination complexes of Fe(III) species with a weak ligand field at a high-spin state that correlated with solubility (r2 = 0.50, P = 0.02) and absorption (r2 = 0.72, P = 0.02). Phytic acid reduced FIA from FePP + CA/TSC rice by 50% (P < 0.001), to the same extent as FeSO4. FIA from FePP + EDTA + ZnO and FePP + EDTA + ZnSO4 rice did not significantly differ. Mean FIAs from FePP + EDTA + ZnSO4, FePP + CA/TSC + ZnSO4, and FePP + NaPP + ZnSO4 rice were 9% to 11% and did not significantly differ from each other or from FeSO4. CONCLUSION Rice extrusion of FePP with solubilizers resulted in bioavailable iron coordination complexes. In the case of FePP + CA/TSC, PA exerted similar inhibition of FIA as with FeSO4. FePP + NaPP could be a further viable solubilizing agent for rice fortification. This study was registered at clinicaltrials.gov as NCT03703739.
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Affiliation(s)
- Pornpimol Scheuchzer
- Department for Health Sciences and Technology (D-HEST), Institute of Food, Nutrition and Health (IFNH), Laboratory of Human Nutrition, ETH Zürich, Zürich, Switzerland
| | - Victoria N Syryamina
- Department for Health Sciences and Technology (D-HEST), Institute of Food, Nutrition and Health (IFNH), Laboratory of Food Biochemistry, ETH Zürich, Zürich, Switzerland; Institute of Chemical Kinetics and Combustion, RAS, Novosibirsk, Russian Federation
| | - Michael Bruce Zimmermann
- Department for Health Sciences and Technology (D-HEST), Institute of Food, Nutrition and Health (IFNH), Laboratory of Human Nutrition, ETH Zürich, Zürich, Switzerland
| | - Christophe Zeder
- Department for Health Sciences and Technology (D-HEST), Institute of Food, Nutrition and Health (IFNH), Laboratory of Human Nutrition, ETH Zürich, Zürich, Switzerland
| | - Laura Nyström
- Department for Health Sciences and Technology (D-HEST), Institute of Food, Nutrition and Health (IFNH), Laboratory of Food Biochemistry, ETH Zürich, Zürich, Switzerland
| | - Maxim Yulikov
- Department of Chemistry and Applied Bioscience (D-CHAB), Laboratory of Physical Chemistry (LPC), ETH Zürich, Zürich, Switzerland
| | - Diego Moretti
- Department for Health Sciences and Technology (D-HEST), Institute of Food, Nutrition and Health (IFNH), Laboratory of Human Nutrition, ETH Zürich, Zürich, Switzerland; Department of Health, Nutrition Research, Swiss Distance University of Applied Sciences (FFHS), Zürich, Switzerland.
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8
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Bala D, Matei I, Ionita G, Cosma DV, Rosu MC, Stanca M, Gaidau C, Baleanu M, Virgolici M, Stanculescu I. Luminescence, Paramagnetic, and Electrochemical Properties of Copper Oxides-Decorated TiO 2/Graphene Oxide Nanocomposites. Int J Mol Sci 2022; 23:ijms232314703. [PMID: 36499031 PMCID: PMC9735503 DOI: 10.3390/ijms232314703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/21/2022] [Accepted: 11/23/2022] [Indexed: 11/27/2022] Open
Abstract
The properties of newly synthesized Cu2O/CuO-decorated TiO2/graphene oxide (GO) nanocomposites (NC) were analyzed aiming to obtain insight into their photocatalytic behavior and their various applications, including water remediation, self-cleaning surfaces, antibacterial materials, and electrochemical sensors. The physico-chemical methods of research were photoluminescence (PL), electron paramagnetic resonance (EPR) spectroscopy, cyclic voltammetry (CV), and differential pulse voltammetry (DPV). The solid samples evidenced an EPR signal that can be attributed to the oxygen-vacancy defects and copper ions in correlation with PL results. Free radicals generated before and after UV-Vis irradiation of powders and aqueous dispersions of Cu2O/CuO-decorated TiO2/GO nanocomposites were studied by EPR spectroscopy using two spin traps, DMPO (5,5-dimethyl-1-pyrroline-N-oxide) and CPH (1-hydroxy-3-carboxy-2,2,5,5-tetramethylpyrrolidine), to highlight the formation of hydroxyl and superoxide reactive oxygen species, respectively. The electrochemical characterization of the NC modified carbon-paste electrodes (CPE) was carried out by CV and DPV. As such, modified carbon-paste electrodes were prepared by mixing carbon paste with copper oxides-decorated TiO2/GO nanocomposites. We have shown that GO reduces the recombination process in TiO2 by immediate electron transfer from excited TiO2 to GO sheets. The results suggest that differences in the PL, respectively, EPR data and electrochemical behavior, are due to the different copper oxides and GO content, presenting new perspectives of materials functionalization.
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Affiliation(s)
- Daniela Bala
- Physical Chemistry Department, Faculty of Chemistry, University of Bucharest, Regina Elisabeta, No. 4-12, 030018 Bucharest, Romania
| | - Iulia Matei
- “Ilie Murgulescu” Institute of Physical Chemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Gabriela Ionita
- “Ilie Murgulescu” Institute of Physical Chemistry, 202 Splaiul Independentei, 060021 Bucharest, Romania
| | - Dragos-Viorel Cosma
- National Institute for Research and Development of Isotopic and Molecular Technologies, 67–103 Donat Street, 400293 Cluj-Napoca, Romania
| | - Marcela-Corina Rosu
- National Institute for Research and Development of Isotopic and Molecular Technologies, 67–103 Donat Street, 400293 Cluj-Napoca, Romania
| | - Maria Stanca
- Leather Research Department, National Institute for Textiles and Leather, Division Leather and Footwear Research Institute (ICPI), 93 Ion Minulescu Street, 031215 Bucharest, Romania
| | - Carmen Gaidau
- Leather Research Department, National Institute for Textiles and Leather, Division Leather and Footwear Research Institute (ICPI), 93 Ion Minulescu Street, 031215 Bucharest, Romania
| | - Maria Baleanu
- Horia Hulubei National Institute of Research and Development for Physics and Nuclear Engineering, 30 Reactorului Str., 077125 Magurele, Romania
| | - Marian Virgolici
- Horia Hulubei National Institute of Research and Development for Physics and Nuclear Engineering, 30 Reactorului Str., 077125 Magurele, Romania
| | - Ioana Stanculescu
- Physical Chemistry Department, Faculty of Chemistry, University of Bucharest, Regina Elisabeta, No. 4-12, 030018 Bucharest, Romania
- Horia Hulubei National Institute of Research and Development for Physics and Nuclear Engineering, 30 Reactorului Str., 077125 Magurele, Romania
- Correspondence:
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9
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Dey B, Mehta S, Mondal A, Cirera J, Colacio E, Chandrasekhar V. Push and Pull Effect of Methoxy and Nitro Groups Modifies the Spin-State Switching Temperature in Fe(III) Complexes. ACS OMEGA 2022; 7:39268-39279. [PMID: 36340084 PMCID: PMC9631739 DOI: 10.1021/acsomega.2c05380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
We have explored the impact of electron-donating (methoxy) and electron-withdrawing (nitro) substituents on SalEen ligand based spin crossover (SCO) behavior of Fe(III) complexes. Thus, 3-X-substituted SalEen ligands were employed to prepare [Fe(3-X-SalEen)2]·NCSe, where X = OMe (1), H (2), and NO2 (3) (3-X-SalEen is the condensation product of 3-substituted salicylaldehyde and N-ethylethylenediamine). The characteristic spin transition temperature (T 1/2) is shown to shift to a lower temperature when an electron-donating substituent (OMe) is used and to a higher temperature when an electron-withdrawing substituent (NO2) is used. We used experimental and theoretical methods to determine the reasons for this behavior. The solid-state magnetic data revealed the transition temperatures for complexes 1, 2, and 3 to be 219, 251, and 366 K, respectively. The solution-state magnetic data also support this trend in T 1/2 values. UV-vis spectra analysis indicates that there is greater delocalization in the π-manifold of the ligand when the nitro group is the substituent. Theoretical studies through density functional theory methods suggest the methoxy substituent decreases the energy gap between the t2g and eg orbitals (explaining the lower T 1/2 value), while the nitro substituent increases the energy gap between the t2g and eg orbitals and thus increases the T 1/2 value.
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Affiliation(s)
- Bijoy Dey
- Tata
Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad500107, India
| | - Sakshi Mehta
- Solid
State and Structural Chemistry Unit, Indian
Institute of Science, Sir C V Raman Road, Bangalore, Karnataka560012, India
| | - Abhishake Mondal
- Solid
State and Structural Chemistry Unit, Indian
Institute of Science, Sir C V Raman Road, Bangalore, Karnataka560012, India
| | - Jordi Cirera
- Departament
de Química Inorgànica i Orgànica and Institut
de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028Barcelona, Spain
| | - Enrique Colacio
- Departamento
de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071Granada, Spain
| | - Vadapalli Chandrasekhar
- Tata
Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad500107, India
- Department
of Chemistry, Indian Institute of Technology
Kanpur, Kanpur, Uttar Pradesh208016, India
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10
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An B, Li Z, Wang Z, Zeng X, Han X, Cheng Y, Sheveleva AM, Zhang Z, Tuna F, McInnes EJL, Frogley MD, Ramirez-Cuesta AJ, S Natrajan L, Wang C, Lin W, Yang S, Schröder M. Direct photo-oxidation of methane to methanol over a mono-iron hydroxyl site. NATURE MATERIALS 2022; 21:932-938. [PMID: 35773491 DOI: 10.1038/s41563-022-01279-1] [Citation(s) in RCA: 40] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
Natural gas, consisting mainly of methane (CH4), has a relatively low energy density at ambient conditions (~36 kJ l-1). Partial oxidation of CH4 to methanol (CH3OH) lifts the energy density to ~17 MJ l-1 and drives the production of numerous chemicals. In nature, this is achieved by methane monooxygenase with di-iron sites, which is extremely challenging to mimic in artificial systems due to the high dissociation energy of the C-H bond in CH4 (439 kJ mol-1) and facile over-oxidation of CH3OH to CO and CO2. Here we report the direct photo-oxidation of CH4 over mono-iron hydroxyl sites immobilized within a metal-organic framework, PMOF-RuFe(OH). Under ambient and flow conditions in the presence of H2O and O2, CH4 is converted to CH3OH with 100% selectivity and a time yield of 8.81 ± 0.34 mmol gcat-1 h-1 (versus 5.05 mmol gcat-1 h-1 for methane monooxygenase). By using operando spectroscopic and modelling techniques, we find that confined mono-iron hydroxyl sites bind CH4 by forming an [Fe-OH···CH4] intermediate, thus lowering the barrier for C-H bond activation. The confinement of mono-iron hydroxyl sites in a porous matrix demonstrates a strategy for C-H bond activation in CH4 to drive the direct photosynthesis of CH3OH.
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Affiliation(s)
- Bing An
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Zhe Li
- College of Chemistry and Chemical Engineering, iCHEM, State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen, China
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - Zi Wang
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Xiangdi Zeng
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Xue Han
- Department of Chemistry, University of Manchester, Manchester, UK
| | - Yongqiang Cheng
- Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | - Alena M Sheveleva
- Department of Chemistry, University of Manchester, Manchester, UK
- Photon Science Institute, University of Manchester, Manchester, UK
| | - Zhongyue Zhang
- Department of Chemistry, Nagoya University, Nagoya, Japan
| | - Floriana Tuna
- Department of Chemistry, University of Manchester, Manchester, UK
- Photon Science Institute, University of Manchester, Manchester, UK
| | - Eric J L McInnes
- Department of Chemistry, University of Manchester, Manchester, UK
- Photon Science Institute, University of Manchester, Manchester, UK
| | - Mark D Frogley
- Diamond Light Source, Harwell Science Campus, Didcot, UK
| | - Anibal J Ramirez-Cuesta
- Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, TN, USA
| | | | - Cheng Wang
- College of Chemistry and Chemical Engineering, iCHEM, State Key Laboratory of Physical Chemistry of Solid Surface, Xiamen University, Xiamen, China
| | - Wenbin Lin
- Department of Chemistry, University of Chicago, Chicago, IL, USA
| | - Sihai Yang
- Department of Chemistry, University of Manchester, Manchester, UK.
| | - Martin Schröder
- Department of Chemistry, University of Manchester, Manchester, UK.
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11
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Hagen WR. Low-frequency EPR of ferrimyoglobin fluoride and ferrimyoglobin cyanide: a case study on the applicability of broadband analysis to high-spin hemoproteins and to HALS hemoproteins. J Biol Inorg Chem 2022; 27:497-507. [PMID: 35802192 PMCID: PMC9399021 DOI: 10.1007/s00775-022-01948-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2022] [Accepted: 06/04/2022] [Indexed: 11/29/2022]
Abstract
An EPR spectrometer has been developed that can be tuned to many frequencies in the range of ca 0.1–15 GHz. Applicability has been tested on ferrimyoglobin fluoride (MbF) and ferrimyoglobin cyanide (MbCN). MbF has a high-spin (S = 5/2) spectrum with 19F superhyperfine splitting that is only resolved in X-band along the heme normal. Low-frequency EPR also resolves the splitting in the heme plane. Measurement of linewidth as a function of frequency provides the basis for an analysis of inhomogeneous broadening in terms of g-strain, zero-field distribution, unresolved superhyperfine splittings and dipolar interaction. Rhombicity in the g tensor is found to be absent. MbCN (S = 1/2) has a highly anisotropic low spin (HALS) spectrum for which gx cannot be determined unequivocally in X-band. Low-frequency EPR allows for measurement of the complete spectrum and determination of the g-tensor.
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Affiliation(s)
- Wilfred R Hagen
- Department of Biotechnology, Delft University of Technology, Delft, The Netherlands.
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12
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Živanović AS, Bukonjić AM, Jovanović-Stević S, Bogojeski J, Ćoćić D, Bijelić AP, Ratković ZR, Volarević V, Miloradović D, Tomović DL, Radić GP. Complexes of copper(II) with tetradentate S,O-ligands: Synthesis, characterization, DNA/albumin interactions, molecular docking simulations and antitumor activity. J Inorg Biochem 2022; 233:111861. [DOI: 10.1016/j.jinorgbio.2022.111861] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 05/02/2022] [Accepted: 05/08/2022] [Indexed: 11/29/2022]
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13
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Ahmed N, Sharma T, Spillecke L, Koo C, Ansari KU, Tripathi S, Caneschi A, Klingeler R, Rajaraman G, Shanmugam M. Probing the Origin of Ferro-/Antiferromagnetic Exchange Interactions in Cu(II)–4f Complexes. Inorg Chem 2022; 61:5572-5587. [DOI: 10.1021/acs.inorgchem.2c00065] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Naushad Ahmed
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Tanu Sharma
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Lena Spillecke
- Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany
| | - Changhyun Koo
- Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany
| | - Kamal Uddin Ansari
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Shalini Tripathi
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Andrea Caneschi
- Department of Industrial Engineering, “DIEF” and INSTM RU, University of Florence, Via di S. Marta 3, 50131 Florence, Italy
| | - Rüdiger Klingeler
- Kirchhoff Institute for Physics, Heidelberg University, 69120 Heidelberg, Germany
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
| | - Maheswaran Shanmugam
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai 400076, Maharashtra, India
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14
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Fe-S clusters masquerading as zinc finger proteins. J Inorg Biochem 2022; 230:111756. [DOI: 10.1016/j.jinorgbio.2022.111756] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 02/01/2022] [Accepted: 02/06/2022] [Indexed: 02/06/2023]
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15
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Pal A, Thakur A. One-pot synthesis of dimerized arenes and heteroarenes under mild conditions using Co( i) as an active catalyst. Org Biomol Chem 2022; 20:8977-8987. [DOI: 10.1039/d2ob01738e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A cheap and robust methodology for dimerization of arenes and heteroarenes with new Co(i) as an active catalyst at room temperature in a shorter time.
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Affiliation(s)
- Adwitiya Pal
- Department of Chemistry, Jadavpur University, Kolkata- 700032, India
| | - Arunabha Thakur
- Department of Chemistry, Jadavpur University, Kolkata- 700032, India
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16
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Garg NK, Goriya Y, Seetharaman M, Muratović S, Pajić D, Cetina M, Petreska I, Krupskaya Y, Kataev V, Johnson MT, Wendt OF, Žilić D. Mononuclear Iron(III) Complex with Unusual Temperature Change of Color and Magneto-Structural Properties: Synthesis, Structure, Magnetization, Multi-frequency ESR and DFT Study. Dalton Trans 2022; 51:2338-2345. [DOI: 10.1039/d1dt03751j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
From the reaction of 2-hydroxy-6-methylpyridine (L) with iron(II) tetrafluoroborate, a new mononuclear iron(III) octahedral complex [FeL6](BF4)3 has been isolated. The color of the complex is reversible changing from red at...
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17
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Spillecke L, Koo C, Maximova O, Mironov VS, Kopotkov VA, Korchagin DV, Vasiliev AN, Yagubskii EB, Klingeler R. Magnetic behavior of the novel pentagonal-bipyramidal erbium(III) complex (Et 3NH)[Er(H 2DAPS)Cl 2]: high-frequency EPR study and crystal-field analysis. Dalton Trans 2021; 50:18143-18154. [PMID: 34854436 DOI: 10.1039/d1dt03228c] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the synthesis, crystal structure and magnetic properties of the new heptacoordinated mononuclear erbium(III) complex (Et3NH)[Er(H2DAPS)Cl2] (H4DAPS = 2,6-diacetylpyridine bis-(salicylhydrazone)) (1). The coordination polyhedron around the Er(III) ion features a slightly distorted pentagonal bipyramid formed by the pentagonal N3O2 chelate ring of the H2DAPS ligand in the equatorial plane and two apical chloride ligands. Detailed high-frequency/high-field electron paramagnetic resonance (HF-EPR) studies of 1 result in the precise determination of the crystal field (CF) splitting energies (0, 290 and 460 GHz) and effective g-values of the three lowest Kramers doublets (KDs) of the Er(III) ion. The obtained HF-EPR data are in good agreement with the results from CF analysis for the Er(III) ion based on the simulation of the dc magnetic data of 1. The results from dynamic susceptibility measurements indicate that there is no slow relaxation of magnetisation behaviour. This observation is discussed in terms of the electronic structure of 1 obtained from experimental and theoretical results.
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Affiliation(s)
- Lena Spillecke
- Kirchhoff Institute for Physics, Heidelberg University, INF 227, D-69120, Heidelberg, Germany.
| | - Changhyun Koo
- Kirchhoff Institute for Physics, Heidelberg University, INF 227, D-69120, Heidelberg, Germany.
| | - Olga Maximova
- Lomonosov Moscow State University, Moscow 119991, Russia
| | - Vladimir S Mironov
- Institute of Problems of Chemical Physics, RAS, Chernogolovka 142432, Russia. .,Shubnikov Institute of Crystallography of Federal Scientific Research Centre 'Crystallography and Photonics', RAS, Moscow 119333, Russia.
| | | | - Denis V Korchagin
- Institute of Problems of Chemical Physics, RAS, Chernogolovka 142432, Russia.
| | - Alexander N Vasiliev
- Lomonosov Moscow State University, Moscow 119991, Russia.,National University of Science and Technology "MISiS", Moscow 119049, Russia
| | - Eduard B Yagubskii
- Institute of Problems of Chemical Physics, RAS, Chernogolovka 142432, Russia.
| | - Rüdiger Klingeler
- Kirchhoff Institute for Physics, Heidelberg University, INF 227, D-69120, Heidelberg, Germany. .,Centre for Advanced Materials (CAM), Heidelberg University, Germany
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18
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Lan S, Hu Q, Zhao Q, Jiang W, Liu J, Feng G, Jiang F, Tang H, Chen J. Synthesis and characterization of Mn-doped C@ZrSiO4 black pigment via non-hydrolytic sol-gel method. ADV POWDER TECHNOL 2021. [DOI: 10.1016/j.apt.2021.06.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Tokhy HH, Elmaghraby EK, Abdelhady AM, Eid AM, Rammah YS, Awad ESM, Abdelaal S. The influence of gamma radiation on organic compounds having carbon ring and its application in dosimetry. RADIOCHIM ACTA 2021. [DOI: 10.1515/ract-2020-0024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The formation of highly oxidizing radicals in multifunctional-solid compounds upon irradiation with gamma-ray had been investigated. Five organic compounds having a single carbon ring had been used in the present investigation; these materials are 1-chloro-4-nitrobenzene, 4′-aminoacetophenone, 3′-hydroxyacetophenone, n-anthranilic acid, and triphenylmethane. These material were irradiated using 60Co radiation with different doses between 20 and 100 kGy. Electron spin resonance spectroscopy spotted increases of the resonance absorption having landé factor around 2.0113 ± 0.003 upon irradiation with the increasing of dose. This resonance absorption was related to the formation of long-lived oxygen radicals that were attached to one of the radiation synthesized compounds. The method of infrared absorption spectroscopy emphasized the formation of cyclic and aliphatic hexane in addition to the active oxygen radicals. n-Anthranilic acid was found to be suitable for radiation the dosimetry with long-lasting radiation signature as electron spin and also to determine the exposure dose. The time-lapse infrared and electron spin resonance measurements had been used to tracked the formation of active species within the time-lapsed after the end of exposure; results showed that the dosimetric signature may be used as a tracker for the time when the exposure happens.
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Affiliation(s)
- Hatem Hussny Tokhy
- Department of Radiation Protection and Dosimetry , National Center for Radiation Research and Technology NCRRT, Atomic Energy Authority , Cairo 13759 , Egypt
- Physics Department , Faculty of Science, Menoufia University , Shebin El-Koom 32511 , Egypt
| | - Elsayed K. Elmaghraby
- Experimental Nuclear Physics Department , Nuclear Research Centre, Egyptian Atomic Energy Authority , Cairo 13759 , Egypt
| | - AbdelWahab M. Abdelhady
- Accelerator and Ion Sources Department , Nuclear Research Center, Egyptian Atomic Energy Authority , Cairo 13759 , Egypt
- Central Lab for Elemental and Isotopic Analysis, Nuclear Research Center, Egyptian Atomic Energy Authority , Cairo 13759 , Egypt
| | - Ahmed M. Eid
- Department of Radiation Protection and Dosimetry , National Center for Radiation Research and Technology NCRRT, Atomic Energy Authority , Cairo 13759 , Egypt
| | - Yasser S. Rammah
- Physics Department , Faculty of Science, Menoufia University , Shebin El-Koom 32511 , Egypt
| | - El-Sayed M. Awad
- Physics Department , Faculty of Science, Menoufia University , Shebin El-Koom 32511 , Egypt
| | - Saad Abdelaal
- Accelerator and Ion Sources Department , Nuclear Research Center, Egyptian Atomic Energy Authority , Cairo 13759 , Egypt
- Central Lab for Elemental and Isotopic Analysis, Nuclear Research Center, Egyptian Atomic Energy Authority , Cairo 13759 , Egypt
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20
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Saveleva VA, Ebner K, Ni L, Smolentsev G, Klose D, Zitolo A, Marelli E, Li J, Medarde M, Safonova OV, Nachtegaal M, Jaouen F, Kramm UI, Schmidt TJ, Herranz J. Potential-Induced Spin Changes in Fe/N/C Electrocatalysts Assessed by In Situ X-ray Emission Spectroscopy. Angew Chem Int Ed Engl 2021; 60:11707-11712. [PMID: 33605017 DOI: 10.1002/anie.202016951] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 02/09/2021] [Indexed: 11/12/2022]
Abstract
The commercial success of the electrochemical energy conversion technologies required for the decarbonization of the energy sector requires the replacement of the noble metal-based electrocatalysts currently used in (co-)electrolyzers and fuel cells with inexpensive, platinum-group metal-free analogs. Among these, Fe/N/C-type catalysts display promising performances for the reduction of O2 or CO2 , but their insufficient activity and stability jeopardize their implementation in such devices. To circumvent these issues, a better understanding of the local geometric and electronic structure of their catalytic active sites under reaction conditions is needed. Herein we shed light on the electronic structure of the molecular sites in two Fe/N/C catalysts by probing their average spin state with X-ray emission spectroscopy (XES). Chiefly, our in situ XES measurements reveal for the first time the existence of reversible, potential-induced spin state changes in these materials.
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Affiliation(s)
| | - Kathrin Ebner
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Lingmei Ni
- Technische Universität Darmstadt, Department of Chemistry and Department of Materials- and Earth Sciences, Otto-Berndt-Strasse 3, 64287, Darmstadt, Germany
| | - Grigory Smolentsev
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Daniel Klose
- ETH Zürich, Departement of Chemistry and Applied Biosciences, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Andrea Zitolo
- Synchrotron SOLEIL, L'orme des Merisiers, BP 48, Saint Aubin, 91192, Gif-sur-Yvette, France
| | - Elena Marelli
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Jingkun Li
- ICGM, Univ. Montpellier, CNRS, ENSCM, Montpellier, France
| | - Marisa Medarde
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Olga V Safonova
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | - Maarten Nachtegaal
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
| | | | - Ulrike I Kramm
- Technische Universität Darmstadt, Department of Chemistry and Department of Materials- and Earth Sciences, Otto-Berndt-Strasse 3, 64287, Darmstadt, Germany
| | - Thomas J Schmidt
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland.,ETH Zürich, Departement of Chemistry and Applied Biosciences, Vladimir-Prelog-Weg 2, 8093, Zürich, Switzerland
| | - Juan Herranz
- Paul Scherrer Institut, Forschungsstrasse 111, 5232, Villigen PSI, Switzerland
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21
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Saveleva VA, Ebner K, Ni L, Smolentsev G, Klose D, Zitolo A, Marelli E, Li J, Medarde M, Safonova OV, Nachtegaal M, Jaouen F, Kramm UI, Schmidt TJ, Herranz J. Potential‐Induced Spin Changes in Fe/N/C Electrocatalysts Assessed by In Situ X‐ray Emission Spectroscopy. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016951] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | - Kathrin Ebner
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Lingmei Ni
- Technische Universität Darmstadt Department of Chemistry and Department of Materials- and Earth Sciences Otto-Berndt-Strasse 3 64287 Darmstadt Germany
| | - Grigory Smolentsev
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Daniel Klose
- ETH Zürich Departement of Chemistry and Applied Biosciences Vladimir-Prelog-Weg 2 8093 Zürich Switzerland
| | - Andrea Zitolo
- Synchrotron SOLEIL L'orme des Merisiers, BP 48, Saint Aubin 91192 Gif-sur-Yvette France
| | - Elena Marelli
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Jingkun Li
- ICGM Univ. Montpellier CNRS ENSCM Montpellier France
| | - Marisa Medarde
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Olga V. Safonova
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | - Maarten Nachtegaal
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
| | | | - Ulrike I. Kramm
- Technische Universität Darmstadt Department of Chemistry and Department of Materials- and Earth Sciences Otto-Berndt-Strasse 3 64287 Darmstadt Germany
| | - Thomas J. Schmidt
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
- ETH Zürich Departement of Chemistry and Applied Biosciences Vladimir-Prelog-Weg 2 8093 Zürich Switzerland
| | - Juan Herranz
- Paul Scherrer Institut Forschungsstrasse 111 5232 Villigen PSI Switzerland
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22
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Torricella F, Pierro A, Mileo E, Belle V, Bonucci A. Nitroxide spin labels and EPR spectroscopy: A powerful association for protein dynamics studies. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2021; 1869:140653. [PMID: 33757896 DOI: 10.1016/j.bbapap.2021.140653] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 03/17/2021] [Accepted: 03/18/2021] [Indexed: 01/01/2023]
Abstract
Site-Directed Spin Labelling (SDSL) technique is based on the attachment of a paramagnetic label onto a specific position of a protein (or other bio-molecules) and the subsequent study by Electron Paramagnetic Resonance (EPR) spectroscopy. In particular, continuous-wave EPR (cw-EPR) spectra can detect the local conformational dynamics for proteins under various conditions. Moreover, pulse-EPR experiments on doubly spin-labelled proteins allow measuring distances between spin centres in the 1.5-8 nm range, providing information about structures and functions. This review focuses on SDSL-EPR spectroscopy as a structural biology tool to investigate proteins using nitroxide labels. The versatility of this spectroscopic approach for protein structural characterization has been demonstrated through the choice of recent studies. The main aim is to provide a general overview of the technique, particularly for non-experts, to spread the applicability of this technique in various fields of structural biology.
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Affiliation(s)
- F Torricella
- CERM-Magnetic Resonance Center, Department of Chemistry, University of Florence, via L.Sacconi 6, 50019 Sesto Fiorentino, Italy
| | - A Pierro
- Aix Marseille Univ, CNRS, BIP, Bioénergétique et Ingénierie des Protéines, IMM, Marseille, France
| | - E Mileo
- Aix Marseille Univ, CNRS, BIP, Bioénergétique et Ingénierie des Protéines, IMM, Marseille, France
| | - V Belle
- Aix Marseille Univ, CNRS, BIP, Bioénergétique et Ingénierie des Protéines, IMM, Marseille, France
| | - A Bonucci
- CERM-Magnetic Resonance Center, Department of Chemistry, University of Florence, via L.Sacconi 6, 50019 Sesto Fiorentino, Italy; Aix Marseille Univ, CNRS, BIP, Bioénergétique et Ingénierie des Protéines, IMM, Marseille, France.
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23
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Ni L, Gallenkamp C, Paul S, Kübler M, Theis P, Chabbra S, Hofmann K, Bill E, Schnegg A, Albert B, Krewald V, Kramm UI. Active Site Identification in FeNC Catalysts and Their Assignment to the Oxygen Reduction Reaction Pathway by In Situ
57
Fe Mössbauer Spectroscopy. ADVANCED ENERGY AND SUSTAINABILITY RESEARCH 2021. [DOI: 10.1002/aesr.202000064] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Lingmei Ni
- Catalysts and Electrocatalysts Group Department of Materials and Earth Sciences and Department of Chemistry TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
- Graduate School Energy Science and Engineering TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
| | - Charlotte Gallenkamp
- Catalysts and Electrocatalysts Group Department of Materials and Earth Sciences and Department of Chemistry TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
- Graduate School Energy Science and Engineering TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
- Department of Chemistry Theoretical Chemistry TU Darmstadt Alarich‐Weiss‐Str. 4 Darmstadt 64287 Germany
| | - Stephen Paul
- Catalysts and Electrocatalysts Group Department of Materials and Earth Sciences and Department of Chemistry TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
- Graduate School Energy Science and Engineering TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
| | - Markus Kübler
- Catalysts and Electrocatalysts Group Department of Materials and Earth Sciences and Department of Chemistry TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
- Graduate School Energy Science and Engineering TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
| | - Pascal Theis
- Catalysts and Electrocatalysts Group Department of Materials and Earth Sciences and Department of Chemistry TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
| | - Sonia Chabbra
- EPR Research Group Max‐Planck Institute for Chemical Energy Conversion Stiftstrasse 34‐36 Mülheim a.d.R. 45470 Germany
| | - Kathrin Hofmann
- Eduard‐Zintl‐Institute of Inorganic and Physical Chemistry Department of Chemistry TU Darmstadt Alarich‐Weiss‐Str. 12 Darmstadt 64287 Germany
| | - Eckhard Bill
- Department Inorganic Spectroscopy Max‐Planck Institute for Chemical Energy Conversion Stiftstrasse 34‐36 Mülheim a.d.R. 45470 Germany
| | - Alexander Schnegg
- EPR Research Group Max‐Planck Institute for Chemical Energy Conversion Stiftstrasse 34‐36 Mülheim a.d.R. 45470 Germany
| | - Barbara Albert
- Eduard‐Zintl‐Institute of Inorganic and Physical Chemistry Department of Chemistry TU Darmstadt Alarich‐Weiss‐Str. 12 Darmstadt 64287 Germany
| | - Vera Krewald
- Department of Chemistry Theoretical Chemistry TU Darmstadt Alarich‐Weiss‐Str. 4 Darmstadt 64287 Germany
| | - Ulrike I. Kramm
- Catalysts and Electrocatalysts Group Department of Materials and Earth Sciences and Department of Chemistry TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
- Graduate School Energy Science and Engineering TU Darmstadt Otto‐Berndt‐Str. 3 Darmstadt 64287 Germany
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Yadav R, Naik RM. The kinetics and mechanism of the ligand substitution reaction of aquapentacyanoruthenate(II) with d-penicillamine in aqueous medium. JOURNAL OF CHEMICAL RESEARCH 2020. [DOI: 10.1177/1747519820961015] [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 kinetics of the formation of the light orange–coloured complex [Ru(CN)5D-PA]3− are studied spectrophotometrically through substitution of a coordinated H2O molecule in aquapentacyanoruthenate(II) [Ru(CN)5OH2]3− by interaction with D-penicillamine [D-PA] in aqueous medium at 490 nm (λmax of [Ru(CN)5D-PA]3−). The reaction is monitored under pseudo-first-order conditions, taking [D-PA] in excess over [Ru(CN)5OH23−]. The effects of various reaction parameters on the rate of the reaction are investigated. Experimental observations reveal that the variation in [D-PA] obeyed the first-order rate law while it is found to be invariant with [Ru(CN)5OH23−] in the whole experimental range. With ionic strength variation, as the reaction advances a decrease in the reaction rate is noticed. The product stoichiometry is assigned as 1:1. The ease of substitution at an H2O molecule in [Ru(CN)5OH23−] is considered on the basis of the electronic effect generated through interactions of the M–OH2 bond. A provisional mechanism based on the calculated results is proposed based on the slowest step of the reaction.
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Affiliation(s)
- Rupal Yadav
- Department of Chemistry, University of Lucknow, Lucknow, India
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25
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Maiti BK, Govil N, Kundu T, Moura JJG. Designed Metal-ATCUN Derivatives: Redox- and Non-redox-Based Applications Relevant for Chemistry, Biology, and Medicine. iScience 2020; 23:101792. [PMID: 33294799 PMCID: PMC7701195 DOI: 10.1016/j.isci.2020.101792] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
The designed “ATCUN” motif (amino-terminal copper and nickel binding site) is a replica of naturally occurring ATCUN site found in many proteins/peptides, and an attractive platform for multiple applications, which include nucleases, proteases, spectroscopic probes, imaging, and small molecule activation. ATCUN motifs are engineered at periphery by conjugation to recombinant proteins, peptides, fluorophores, or recognition domains through chemically or genetically, fulfilling the needs of various biological relevance and a wide range of practical usages. This chemistry has witnessed significant growth over the last few decades and several interesting ATCUN derivatives have been described. The redox role of the ATCUN moieties is also an important aspect to be considered. The redox potential of designed M-ATCUN derivatives is modulated by judicious choice of amino acid (including stereochemistry, charge, and position) that ultimately leads to the catalytic efficiency. In this context, a wide range of M-ATCUN derivatives have been designed purposefully for various redox- and non-redox-based applications, including spectroscopic probes, target-based catalytic metallodrugs, inhibition of amyloid-β toxicity, and telomere shortening, enzyme inactivation, biomolecules stitching or modification, next-generation antibiotic, and small molecule activation.
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Affiliation(s)
- Biplab K Maiti
- National Institute of Technology Sikkim, Ravangla Campus, Barfung Block, Ravangla Sub Division, South Sikkim 737139, India
| | - Nidhi Govil
- National Institute of Technology Sikkim, Ravangla Campus, Barfung Block, Ravangla Sub Division, South Sikkim 737139, India
| | - Taraknath Kundu
- National Institute of Technology Sikkim, Ravangla Campus, Barfung Block, Ravangla Sub Division, South Sikkim 737139, India
| | - José J G Moura
- LAQV-REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa, Campus de Caparica, 2829-516 Caparica, Portugal
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26
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Calvey GD, Katz AM, Zielinski KA, Dzikovski B, Pollack L. Characterizing Enzyme Reactions in Microcrystals for Effective Mix-and-Inject Experiments using X-ray Free-Electron Lasers. Anal Chem 2020; 92:13864-13870. [PMID: 32955854 PMCID: PMC8367009 DOI: 10.1021/acs.analchem.0c02569] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Mix-and-inject serial crystallography is an emerging technique that utilizes X-ray free-electron lasers (XFELs) and microcrystalline samples to capture atomically detailed snapshots of biomolecules as they function. Early experiments have yielded exciting results; however, there are limited options to characterize reactions in crystallo in advance of the beamtime. Complementary measurements are needed to identify the best conditions and timescales for observing structural intermediates. Here, we describe the interface of XFEL compatible mixing injectors with rapid freeze-quenching and X-band EPR spectroscopy, permitting characterization of reactions in crystals under the same conditions as an XFEL experiment. We demonstrate this technology by tracking the reaction of azide with microcrystalline myoglobin, using only a fraction of the sample required for a mix-and-inject experiment. This spectroscopic method enables optimization of sample and mixer conditions to maximize the populations of intermediate states, eliminating the guesswork of current mix-and-inject experiments.
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Affiliation(s)
- George D Calvey
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
| | - Andrea M Katz
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
| | - Kara A Zielinski
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
| | - Boris Dzikovski
- Department of Chemistry and Chemical Biology and National Biomedical Center for Advanced ESR Technology, Cornell University, Ithaca, New York 14853, United States
| | - Lois Pollack
- School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, United States
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27
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Kuntze-Fechner MW, Verplancke H, Tendera L, Diefenbach M, Krummenacher I, Braunschweig H, Marder TB, Holthausen MC, Radius U. Coligand role in the NHC nickel catalyzed C-F bond activation: investigations on the insertion of bis(NHC) nickel into the C-F bond of hexafluorobenzene. Chem Sci 2020; 11:11009-11023. [PMID: 34094350 PMCID: PMC8162383 DOI: 10.1039/d0sc04237d] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The reaction of [Ni(Mes2Im)2] (1) (Mes2Im = 1,3-dimesityl-imidazolin-2-ylidene) with polyfluorinated arenes as well as mechanistic investigations concerning the insertion of 1 and [Ni(iPr2Im)2] (1ipr) (iPr2Im = 1,3-diisopropyl-imidazolin-2-ylidene) into the C–F bond of C6F6 is reported. The reaction of 1 with different fluoroaromatics leads to formation of the nickel fluoroaryl fluoride complexes trans-[Ni(Mes2Im)2(F)(ArF)] (ArF = 4-CF3-C6F42, C6F53, 2,3,5,6-C6F4N 4, 2,3,5,6-C6F4H 5, 2,3,5-C6F3H26, 3,5-C6F2H37) in fair to good yields with the exception of the formation of the pentafluorophenyl complex 3 (less than 20%). Radical species and other diamagnetic side products were detected for the reaction of 1 with C6F6, in line with a radical pathway for the C–F bond activation step using 1. The difluoride complex trans-[Ni(Mes2Im)2(F)2] (9), the bis(aryl) complex trans-[Ni(Mes2Im)2(C6F5)2] (15), the structurally characterized nickel(i) complex trans-[NiI(Mes2Im)2(C6F5)] (11) and the metal radical trans-[NiI(Mes2Im)2(F)] (12) were identified. Complex 11, and related [NiI(Mes2Im)2(2,3,5,6-C6F4H)] (13) and [NiI(Mes2Im)2(2,3,5-C6F3H2)] (14), were synthesized independently by reaction of trans-[Ni(Mes2Im)2(F)(ArF)] with PhSiH3. Simple electron transfer from 1 to C6F6 was excluded, as the redox potentials of the reaction partners do not match and [Ni(Mes2Im)2]+, which was prepared independently, was not detected. DFT calculations were performed on the insertion of [Ni(iPr2Im)2] (1ipr) and [Ni(Mes2Im)2] (1) into the C–F bond of C6F6. For 1ipr, concerted and NHC-assisted pathways were identified as having the lowest kinetic barriers, whereas for 1, a radical mechanism with fluoride abstraction and an NHC-assisted pathway are both associated with almost the same kinetic barrier. A combined experimental and theoretical study on the mechanism of the C–F bond activation of C6F6 with [Ni(NHC)2] is provided.![]()
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Affiliation(s)
- Maximilian W Kuntze-Fechner
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Hendrik Verplancke
- Institute for Inorganic and Analytical Chemistry, Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt Germany
| | - Lukas Tendera
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Martin Diefenbach
- Institute for Inorganic and Analytical Chemistry, Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt Germany
| | - Ivo Krummenacher
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Todd B Marder
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany .,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
| | - Max C Holthausen
- Institute for Inorganic and Analytical Chemistry, Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt Germany
| | - Udo Radius
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg Am Hubland 97074 Würzburg Germany
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28
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Silva RMB, Grodick MA, Barton JK. UvrC Coordinates an O 2-Sensitive [4Fe4S] Cofactor. J Am Chem Soc 2020; 142:10964-10977. [PMID: 32470300 DOI: 10.1021/jacs.0c01671] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Recent advances have led to numerous landmark discoveries of [4Fe4S] clusters coordinated by essential enzymes in repair, replication, and transcription across all domains of life. The cofactor has notably been challenging to observe for many nucleic acid processing enzymes due to several factors, including a weak bioinformatic signature of the coordinating cysteines and lability of the metal cofactor. To overcome these challenges, we have used sequence alignments, an anaerobic purification method, iron quantification, and UV-visible and electron paramagnetic resonance spectroscopies to investigate UvrC, the dual-incision endonuclease in the bacterial nucleotide excision repair (NER) pathway. The characteristics of UvrC are consistent with [4Fe4S] coordination with 60-70% cofactor incorporation, and additionally, we show that, bound to UvrC, the [4Fe4S] cofactor is susceptible to oxidative degradation with aggregation of apo species. Importantly, in its holo form with the cofactor bound, UvrC forms high affinity complexes with duplexed DNA substrates; the apparent dissociation constants to well-matched and damaged duplex substrates are 100 ± 20 nM and 80 ± 30 nM, respectively. This high affinity DNA binding contrasts reports made for isolated protein lacking the cofactor. Moreover, using DNA electrochemistry, we find that the cluster coordinated by UvrC is redox-active and participates in DNA-mediated charge transport chemistry with a DNA-bound midpoint potential of 90 mV vs NHE. This work highlights that the [4Fe4S] center is critical to UvrC.
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Affiliation(s)
- Rebekah M B Silva
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Michael A Grodick
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
| | - Jacqueline K Barton
- Division of Chemistry and Chemical Engineering, California Institute of Technology, Pasadena, California 91125, United States
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29
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Stewart TJ. Across the spectrum: integrating multidimensional metal analytics for in situ metallomic imaging. Metallomics 2020; 11:29-49. [PMID: 30499574 PMCID: PMC6350628 DOI: 10.1039/c8mt00235e] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
To know how much of a metal species is in a particular location within a biological context at any given time is essential for understanding the intricate roles of metals in biology and is the fundamental question upon which the field of metallomics was born. Simply put, seeing is powerful. With the combination of spectroscopy and microscopy, we can now see metals within complex biological matrices complemented by information about associated molecules and their structures. With the addition of mass spectrometry and particle beam based techniques, the field of view grows to cover greater sensitivities and spatial resolutions, addressing structural, functional and quantitative metallomic questions from the atomic level to whole body processes. In this perspective, I present a paradigm shift in the way we relate to and integrate current and developing metallomic analytics, highlighting both familiar and perhaps less well-known state of the art techniques for in situ metallomic imaging, specific biological applications, and their use in correlative studies. There is a genuine need to abandon scientific silos and, through the establishment of a metallomic scientific platform for further development of multidimensional analytics for in situ metallomic imaging, we have an incredible opportunity to enhance the field of metallomics and demonstrate how discovery research can be done more effectively.
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Affiliation(s)
- Theodora J Stewart
- King's College London, Mass Spectrometry, London Metallomics Facility, 4th Floor Franklin-Wilkins Building, 150 Stamford St., London SE1 9NH, UK.
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30
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Abstract
From the very first discovery of biological iron-sulfur clusters with EPR, the spectroscopy has been used to study not only purified proteins but also complex systems such as respiratory complexes, membrane particles and, later, whole cells. In recent times, the emphasis of iron-sulfur biochemistry has moved from characterization of individual proteins to the systems biology of iron-sulfur biosynthesis, regulation, degradation, and implications for human health. Although this move would suggest a blossoming of System-EPR as a specific, non-invasive monitor of Fe/S (dys)homeostasis in whole cells, a review of the literature reveals limited success possibly due to technical difficulties in adherence to EPR spectroscopic and biochemical standards. In an attempt to boost application of System-EPR the required boundary conditions and their practical applications are explicitly and comprehensively formulated.
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Affiliation(s)
- Wilfred R Hagen
- Department of Biotechnology, Delft University of Technology, Van der Maasweg 9, 2629HZ, Delft, The Netherlands.
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31
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Roessler MM, Salvadori E. Principles and applications of EPR spectroscopy in the chemical sciences. Chem Soc Rev 2018; 47:2534-2553. [PMID: 29498718 DOI: 10.1039/c6cs00565a] [Citation(s) in RCA: 138] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Electron spins permeate every aspect of science and influence numerous chemical processes: they underpin transition metal chemistry and biochemistry, mediate photosynthesis and photovoltaics and are paramount in the field of quantum information, to name but a few. Electron paramagnetic resonance (EPR) spectroscopy detects unpaired electrons and provides detailed information on structure and bonding of paramagnetic species. In this tutorial review, aimed at non-specialists, we provide a theoretical framework and examples to illustrate the vast scope of the technique in chemical research. Case studies were chosen to exemplify systematically the different interactions that characterize a paramagnetic centre and to illustrate how EPR spectroscopy may be used to derive chemical information.
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Affiliation(s)
- Maxie M Roessler
- School of Biological and Chemical Sciences, Queen Mary University of London, Mile End Road, London, E1 4NS, UK.
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32
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Coordinate and redox interactions of epinephrine with ferric and ferrous iron at physiological pH. Sci Rep 2018; 8:3530. [PMID: 29476145 PMCID: PMC5824886 DOI: 10.1038/s41598-018-21940-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2017] [Accepted: 02/09/2018] [Indexed: 01/04/2023] Open
Abstract
Coordinate and redox interactions of epinephrine (Epi) with iron at physiological pH are essential for understanding two very different phenomena – the detrimental effects of chronic stress on the cardiovascular system and the cross-linking of catecholamine-rich biopolymers and frameworks. Here we show that Epi and Fe3+ form stable high-spin complexes in the 1:1 or 3:1 stoichiometry, depending on the Epi/Fe3+ concentration ratio (low or high). Oxygen atoms on the catechol ring represent the sites of coordinate bond formation within physiologically relevant bidentate 1:1 complex. Redox properties of Epi are slightly impacted by Fe3+. On the other hand, Epi and Fe2+ form a complex that acts as a strong reducing agent, which leads to the production of hydrogen peroxide via O2 reduction, and to a facilitated formation of the Epi–Fe3+ complexes. Epi is not oxidized in this process, i.e. Fe2+ is not an electron shuttle, but the electron donor. Epi-catalyzed oxidation of Fe2+ represents a plausible chemical basis of stress-related damage to heart cells. In addition, our results support the previous findings on the interactions of catecholamine moieties in polymers with iron and provide a novel strategy for improving the efficiency of cross-linking.
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Freibert SA, Weiler BD, Bill E, Pierik AJ, Mühlenhoff U, Lill R. Biochemical Reconstitution and Spectroscopic Analysis of Iron-Sulfur Proteins. Methods Enzymol 2018; 599:197-226. [PMID: 29746240 DOI: 10.1016/bs.mie.2017.11.034] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Iron-sulfur (Fe/S) proteins are involved in numerous key biological functions such as respiration, metabolic processes, protein translation, DNA synthesis, and DNA repair. The simplest types of Fe/S clusters include [2Fe-2S], [3Fe-4S], and [4Fe-4S] forms that sometimes are present in multiple copies. De novo assembly of Fe/S cofactors and their insertion into apoproteins in living cells requires complex proteinaceous machineries that are frequently highly conserved. In eukaryotes such as yeast and mammals, the mitochondrial iron-sulfur cluster assembly machinery and the cytosolic iron-sulfur protein assembly system consist of more than 30 components that cooperate in the generation of some 50 cellular Fe/S proteins. Both the mechanistic dissection of the intracellular Fe/S protein assembly pathways and the identification and characterization of Fe/S proteins rely on tool boxes of in vitro and in vivo methods. These cell biological, biochemical, and biophysical techniques help to determine the extent, stability, and type of bound Fe/S cluster. They also serve to distinguish bona fide Fe/S proteins from other metal-binding proteins containing similar cofactor coordination motifs. Here, we present a collection of in vitro methods that have proven useful for basic biochemical and biophysical characterization of Fe/S proteins. First, we describe the chemical assembly of [2Fe-2S] or [4Fe-4S] clusters on purified apoproteins. Then, we summarize a reconstitution system reproducing the de novo synthesis of a [2Fe-2S] cluster in mitochondria. Finally, we explain the use of UV-vis, CD, electron paramagnetic resonance, and Mössbauer spectroscopy for the routine characterization of Fe/S proteins.
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Affiliation(s)
| | | | - Eckhard Bill
- Max-Planck-Institut für Chemische Energiekonversion, Mülheim an der Ruhr, Germany
| | - Antonio J Pierik
- Chemistry and Biochemistry, Technical University of Kaiserlautern, Kaiserlautern, Germany
| | | | - Roland Lill
- Institut für Zytobiologie, Philipps-Universität, Marburg, Germany; LOEWE Zentrum für Synthetische Mikrobiologie SynMikro, Marburg, Germany.
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34
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Ponomarenko N, Niklas J, Pokkuluri PR, Poluektov O, Tiede DM. Electron Paramagnetic Resonance Characterization of the Triheme Cytochrome from Geobacter sulfurreducens. Biochemistry 2018; 57:1722-1732. [DOI: 10.1021/acs.biochem.7b00917] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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35
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Gama S, Frontauria M, Ueberschaar N, Brancato G, Milea D, Sammartano S, Plass W. Thermodynamic study on 8-hydroxyquinoline-2-carboxylic acid as a chelating agent for iron found in the gut of Noctuid larvae. NEW J CHEM 2018. [DOI: 10.1039/c7nj04889k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
8-HQA is a good sequestering agent towards Fe2+ and Fe3+ over a wide pH range.
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Affiliation(s)
- Sofia Gama
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Mariachiara Frontauria
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Nico Ueberschaar
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Giuseppe Brancato
- Scuola Normale Superiore
- Palazzo della Carovana
- Classe di Scienze Matematiche e Naturali
- Pisa
- Italy
| | - Demetrio Milea
- Dipartimento di Scienze Chimiche
- Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
| | - Silvio Sammartano
- Dipartimento di Scienze Chimiche
- Biologiche
- Farmaceutiche ed Ambientali
- Università di Messina
- 98166 Messina
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
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36
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Das K, Datta A, Pevec A, Mane SB, Rameez M, Garribba E, Akitsu T, Tanka S. Structural elucidation, EPR and magnetic property of a Co(III) complex salt incorporating 4,4′-bipyridine and 5-sulfoisophthalate. J Mol Struct 2018. [DOI: 10.1016/j.molstruc.2017.09.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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37
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Božić B, Korać J, Stanković DM, Stanić M, Popović-Bijelić A, Bogdanović Pristov J, Spasojević I, Bajčetić M. Mechanisms of redox interactions of bilirubin with copper and the effects of penicillamine. Chem Biol Interact 2017; 278:129-134. [PMID: 29079291 DOI: 10.1016/j.cbi.2017.10.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 10/10/2017] [Accepted: 10/22/2017] [Indexed: 10/18/2022]
Abstract
Toxic effects of unconjugated bilirubin (BR) in neonatal hyperbilirubinemia have been related to redox and/or coordinate interactions with Cu2+. However, the development and mechanisms of such interactions at physiological pH have not been resolved. This study shows that BR reduces Cu2+ to Cu1+ in 1:1 stoichiometry. Apparently, BR undergoes degradation, i.e. BR and Cu2+ do not form stable complexes. The binding of Cu2+ to inorganic phosphates, liposomal phosphate groups, or to chelating drug penicillamine, impedes redox interactions with BR. Cu1+ undergoes spontaneous oxidation by O2 resulting in hydrogen peroxide accumulation and hydroxyl radical production. In relation to this, copper and BR induced synergistic oxidative/damaging effects on erythrocytes membrane, which were alleviated by penicillamine. The production of reactive oxygen species by BR and copper represents a plausible cause of BR toxic effects and cell damage in hyperbilirubinemia. Further examination of therapeutic potentials of copper chelators in the treatment of severe neonatal hyperbilirubinemia is needed.
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Affiliation(s)
- Bojana Božić
- Department of Pharmacology, Clinical Pharmacology and Toxicology, School of Medicine, University of Belgrade, P.O. Box 38, 11000 Belgrade, Serbia
| | - Jelena Korać
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia
| | - Dalibor M Stanković
- The Vinča Institute of Nuclear Sciences, University of Belgrade, POB 522, 11001 Belgrade, Serbia; Department of Analytical Chemistry, Innovation Center of the Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, Belgrade, 11000, Serbia
| | - Marina Stanić
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia
| | - Ana Popović-Bijelić
- EPR Laboratory, Faculty of Physical Chemistry, University of Belgrade, Studentski trg 12-16, 11158 Belgrade, Serbia
| | - Jelena Bogdanović Pristov
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia
| | - Ivan Spasojević
- Life Sciences Department, Institute for Multidisciplinary Research, University of Belgrade, Kneza Višeslava 1, 11000 Belgrade, Serbia.
| | - Milica Bajčetić
- Department of Pharmacology, Clinical Pharmacology and Toxicology, School of Medicine, University of Belgrade, P.O. Box 38, 11000 Belgrade, Serbia; Clinical Pharmacology Unit, University Children's Hospital, 11000 Belgrade, Serbia
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38
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Kroneck PMH. Walking the seven lines: binuclear copper A in cytochrome c oxidase and nitrous oxide reductase. J Biol Inorg Chem 2017; 23:27-39. [PMID: 29218634 DOI: 10.1007/s00775-017-1510-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 10/20/2017] [Indexed: 01/19/2023]
Abstract
The enzymes nitrous oxide reductase (N2OR) and cytochrome c oxidase (COX) are constituents of important biological processes. N2OR is the terminal reductase in a respiratory chain converting N2O to N2 in denitrifying bacteria; COX is the terminal oxidase of the aerobic respiratory chain of certain bacteria and eukaryotic organisms transforming O2 to H2O accompanied by proton pumping. Different spectroscopies including magnetic resonance techniques, were applied to show that N2OR has a mixed-valent Cys-bridged [Cu1.5+(CyS)2Cu1.5+] copper site, and that such a binuclear center, called CuA, does also exist in COX. A sequence motif shared between the CuA center of N2OR and the subunit II of COX raises the issue of a putative evolutionary relationship of the two enzymes. The suggestion of a binuclear CuA in COX, with one unpaired electron delocalized between two equivalent Cu nuclei, was difficult to accept originally, even though regarded as a clever solution to many experimental observations. This minireview in honor of Helmut Sigel traces several of the critical steps forward in understanding the nature of CuA in N2OR and COX, and discusses its unique electronic features to some extent including the contributions made by the development of methodology and the discovery of a novel multi-copper enzyme. Left: X-band (9.130 GHz) and C-band (4.530 GHz, 1st harmonic display of experimental spectrum) EPR spectra of bovine heart cytochrome c oxidase, recorded at 20K. Right: Ribbon presentation of the CuA domain in cytochrome c oxidase and nitrous oxide reductase.
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Affiliation(s)
- Peter M H Kroneck
- Department of Biology, University of Konstanz, Universitätsstrasse 10, 78457, Konstanz, Germany.
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Cobamide-mediated enzymatic reductive dehalogenation via long-range electron transfer. Nat Commun 2017; 8:15858. [PMID: 28671181 PMCID: PMC5500849 DOI: 10.1038/ncomms15858] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 05/03/2017] [Indexed: 12/18/2022] Open
Abstract
The capacity of metal-containing porphyrinoids to mediate reductive dehalogenation is implemented in cobamide-containing reductive dehalogenases (RDases), which serve as terminal reductases in organohalide-respiring microbes. RDases allow for the exploitation of halogenated compounds as electron acceptors. Their reaction mechanism is under debate. Here we report on substrate–enzyme interactions in a tetrachloroethene RDase (PceA) that also converts aryl halides. The shape of PceA’s highly apolar active site directs binding of bromophenols at some distance from the cobalt and with the hydroxyl substituent towards the metal. A close cobalt–substrate interaction is not observed by electron paramagnetic resonance spectroscopy. Nonetheless, a halogen substituent para to the hydroxyl group is reductively eliminated and the path of the leaving halide is traced in the structure. Based on these findings, an enzymatic mechanism relying on a long-range electron transfer is concluded, which is without parallel in vitamin B12-dependent biochemistry and represents an effective mode of RDase catalysis. Cobalamin-containing reductive dehalogenases from organohalide-respiring bacteria play a key role in the degradation of halogenated organic compounds. Here the authors proposed a catalytic mechanism for dehalogenation that relies on a long-range electron transfer from the cobalt in the centre of the enzyme’s cofactor to the substrate.
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40
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Nandi S, Das K, Datta A, Roy S, Garribba E, Akitsu T, Sinha C. A rare cobalt(III) paramagnetic derivative incorporating 1-alkyl-2-[(o-thioalkyl)phenylazo]imidazole (SMeaaiNEt): EPR, redox and magnetic interpretation. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.03.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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41
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Bode AAC, Granneman SJC, Feiters MC, Verwer P, Jiang S, Meijer JAM, van Enckevort WJP, Vlieg E. Structure and activity of the anticaking agent iron(III) meso-tartrate. Dalton Trans 2016; 45:6650-9. [PMID: 26974191 DOI: 10.1039/c6dt00098c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Iron(III) meso-tartrate, a metal-organic complex, is a new anticaking agent for sodium chloride. A molecular structure in solution is proposed, based on a combination of experimental and molecular modelling results. We show that the active complex is a binuclear iron(iii) complex with two bridging meso-tartrate ligands. The iron atoms are antiferromagnetically coupled, resulting in a reduced paramagnetic nature of the solution. In solution, a water molecule coordinates to each iron atom as a sixth ligand, resulting in an octahedral symmetry around each iron atom. When the water molecule is removed, a flat and charged site is exposed, matching the charge distribution of the {100} sodium chloride crystal surface. This charge distribution is also found in the iron(iii) citrate complex, another anticaking agent. This gives a possible adsorption geometry on the crystal surface, which in turn explains the anticaking activity of the iron(III) meso-tartrate complex.
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Affiliation(s)
- Arno A C Bode
- Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
| | - Sanne J C Granneman
- Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
| | - Martin C Feiters
- Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
| | - Paul Verwer
- AkzoNobel Industrial Chemicals, Salts and Crystallization, Deventer, The Netherlands
| | - Shanfeng Jiang
- AkzoNobel Industrial Chemicals, Salts and Crystallization, Deventer, The Netherlands
| | - Jan A M Meijer
- AkzoNobel Industrial Chemicals, Salts and Crystallization, Deventer, The Netherlands
| | - Willem J P van Enckevort
- Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
| | - Elias Vlieg
- Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ, Nijmegen, The Netherlands.
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42
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A Abdel-Rahman E, Mahmoud AM, Khalifa AM, Ali SS. Physiological and pathophysiological reactive oxygen species as probed by EPR spectroscopy: the underutilized research window on muscle ageing. J Physiol 2016; 594:4591-613. [PMID: 26801204 DOI: 10.1113/jp271471] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2015] [Accepted: 12/04/2015] [Indexed: 12/18/2022] Open
Abstract
Reactive oxygen and nitrogen species (ROS and RNS) play crucial roles in triggering, mediating and regulating physiological and pathophysiological signal transduction pathways within the cell. Within the cell, ROS efflux is firmly controlled both spatially and temporally, making the study of ROS dynamics a challenging task. Different approaches have been developed for ROS assessment; however, many of these assays are not capable of direct identification or determination of subcellular localization of different ROS. Here we highlight electron paramagnetic resonance (EPR) spectroscopy as a powerful technique that is uniquely capable of addressing questions on ROS dynamics in different biological specimens and cellular compartments. Due to their critical importance in muscle functions and dysfunction, we discuss in some detail spin trapping of various ROS and focus on EPR detection of nitric oxide before highlighting how EPR can be utilized to probe biophysical characteristics of the environment surrounding a given stable radical. Despite the demonstrated ability of EPR spectroscopy to provide unique information on the identity, quantity, dynamics and environment of radical species, its applications in the field of muscle physiology, fatiguing and ageing are disproportionately infrequent. While reviewing the limited examples of successful EPR applications in muscle biology we conclude that the field would greatly benefit from more studies exploring ROS sources and kinetics by spin trapping, protein dynamics by site-directed spin labelling, and membrane dynamics and global redox changes by spin probing EPR approaches.
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Affiliation(s)
- Engy A Abdel-Rahman
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Ali M Mahmoud
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Abdulrahman M Khalifa
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
| | - Sameh S Ali
- Center for Aging and Associated Diseases, Helmy Institute of Medical Sciences, Zewail City of Science and Technology, Giza, Egypt
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43
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Mondragón A, Martínez-Alanis PR, Aullón G, Hernández-Ortega S, Robles-Marín E, Flores-Alamo M, Ugalde-Saldívar VM, Castillo I. Redox flexibility of iron complexes supported by sulfur-based tris(o-methylenethiophenolato)amine relative to its tripodal oxygen-based congener. Dalton Trans 2016; 45:9996-10006. [DOI: 10.1039/c6dt00814c] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Tripodal ligands designed to generate a local C3 symmetry have resulted in novel types of metal complexes that feature unusual bonding and electronic properties.
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Affiliation(s)
| | - Paulina R. Martínez-Alanis
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Gabriel Aullón
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | | | - Elvis Robles-Marín
- Instituto de Química
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Marcos Flores-Alamo
- Facultad de Química
- División de Estudios de Posgrado
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Víctor M. Ugalde-Saldívar
- Facultad de Química
- División de Estudios de Posgrado
- Universidad Nacional Autónoma de México
- México DF
- México
| | - Ivan Castillo
- Instituto de Química
- Universidad Nacional Autónoma de México
- México DF
- México
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44
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Zhao Z, Zhang J, Wang M, Wang Z, Wang L, Ma L, Huang X, Li Z. Structure advantage and peroxidase activity enhancement of deuterohemin-peptide–inorganic hybrid flowers. RSC Adv 2016. [DOI: 10.1039/c6ra24192a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Hybridizing deuterohemin-peptide (DhHP-6) with copper phosphate to form hybrid flowers was prepared for preventing DhHP-6 aggregation.
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Affiliation(s)
- Zijian Zhao
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- PR China
- Key Laboratory for Molecular Enzymology
| | - Ji Zhang
- Key Laboratory for Molecular Enzymology
- Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
| | - Mingyang Wang
- National Engineering Laboratory for AIDS Vaccine
- College of Life Science
- Jilin University
- Changchun 130012
- PR China
| | - Zhi Wang
- Key Laboratory for Molecular Enzymology
- Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
| | - Liping Wang
- National Engineering Laboratory for AIDS Vaccine
- College of Life Science
- Jilin University
- Changchun 130012
- PR China
| | - Li Ma
- Key Laboratory for Molecular Enzymology
- Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
| | - Xuri Huang
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- PR China
| | - Zhengqiang Li
- Key Laboratory for Molecular Enzymology
- Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
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45
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Zhao Z, Wang D, Wang M, Sun X, Wang L, Huang X, Ma L, Li Z. Proximal environment controlling the reactivity between inorganic sulfide and heme-peptide model. RSC Adv 2016. [DOI: 10.1039/c6ra14100e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Synthesized deuterohemin-peptide, which is lack of the distal protein structure, is used as a heme model to investigate the effects of the proximal environment on the reactivity of inorganic sulfide to heme center.
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Affiliation(s)
- Zijian Zhao
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
- PR China
| | - Dandan Wang
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
- PR China
| | - Mingyang Wang
- National Engineering Laboratory for AIDS Vaccine
- Jilin University
- Changchun 130012
- PR China
| | - Xiaoli Sun
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- PR China
| | - Liping Wang
- National Engineering Laboratory for AIDS Vaccine
- Jilin University
- Changchun 130012
- PR China
| | - Xuri Huang
- Institute of Theoretical Chemistry
- Jilin University
- Changchun 130023
- PR China
| | - Li Ma
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
- PR China
| | - Zhengqiang Li
- Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education
- College of Life Science
- Jilin University
- Changchun 130012
- PR China
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Rajakovich LJ, Nørgaard H, Warui DM, Chang WC, Li N, Booker SJ, Krebs C, Bollinger JM, Pandelia ME. Rapid Reduction of the Diferric-Peroxyhemiacetal Intermediate in Aldehyde-Deformylating Oxygenase by a Cyanobacterial Ferredoxin: Evidence for a Free-Radical Mechanism. J Am Chem Soc 2015; 137:11695-709. [PMID: 26284355 DOI: 10.1021/jacs.5b06345] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Aldehyde-deformylating oxygenase (ADO) is a ferritin-like nonheme-diiron enzyme that catalyzes the last step in a pathway through which fatty acids are converted into hydrocarbons in cyanobacteria. ADO catalyzes conversion of a fatty aldehyde to the corresponding alk(a/e)ne and formate, consuming four electrons and one molecule of O2 per turnover and incorporating one atom from O2 into the formate coproduct. The source of the reducing equivalents in vivo has not been definitively established, but a cyanobacterial [2Fe-2S] ferredoxin (PetF), reduced by ferredoxin-NADP(+) reductase (FNR) using NADPH, has been implicated. We show that both the diferric form of Nostoc punctiforme ADO and its (putative) diferric-peroxyhemiacetal intermediate are reduced much more rapidly by Synechocystis sp. PCC6803 PetF than by the previously employed chemical reductant, 1-methoxy-5-methylphenazinium methyl sulfate. The yield of formate and alkane per reduced PetF approaches its theoretical upper limit when reduction of the intermediate is carried out in the presence of FNR. Reduction of the intermediate by either system leads to accumulation of a substrate-derived peroxyl radical as a result of off-pathway trapping of the C2-alkyl radical intermediate by excess O2, which consequently diminishes the yield of the hydrocarbon product. A sulfinyl radical located on residue Cys71 also accumulates with short-chain aldehydes. The detection of these radicals under turnover conditions provides the most direct evidence to date for a free-radical mechanism. Additionally, our results expose an inefficiency of the enzyme in processing its radical intermediate, presenting a target for optimization of bioprocesses exploiting this hydrocarbon-production pathway.
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Affiliation(s)
- Lauren J Rajakovich
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Hanne Nørgaard
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Douglas M Warui
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Wei-chen Chang
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Ning Li
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Squire J Booker
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Carsten Krebs
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - J Martin Bollinger
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
| | - Maria-Eirini Pandelia
- Department of Biochemistry and Molecular Biology and ‡Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States
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47
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Thennarasu G, Sivasamy A. Metal ion doped semiconductor metal oxide nanosphere particles prepared by soft chemical method and its visible light photocatalytic activity in degradation of phenol. POWDER TECHNOL 2013. [DOI: 10.1016/j.powtec.2013.08.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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48
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Honarmand Ebrahimi K, Dienemann C, Hoefgen S, Than ME, Hagedoorn PL, Hagen WR. The amyloid precursor protein (APP) does not have a ferroxidase site in its E2 domain. PLoS One 2013; 8:e72177. [PMID: 23977245 PMCID: PMC3747053 DOI: 10.1371/journal.pone.0072177] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 07/02/2013] [Indexed: 02/07/2023] Open
Abstract
The ubiquitous 24-meric iron-storage protein ferritin and multicopper oxidases such as ceruloplasmin or hephaestin catalyze oxidation of Fe(II) to Fe(III), using molecular oxygen as oxidant. The ferroxidase activity of these proteins is essential for cellular iron homeostasis. It has been reported that the amyloid precursor protein (APP) also has ferroxidase activity. The activity is assigned to a ferroxidase site in the E2 domain of APP. A synthetic 22-residue peptide that carries the putative ferroxidase site of E2 domain (FD1 peptide) has been claimed to encompass the same activity. We previously tested the ferroxidase activity of the synthetic FD1 peptide but we did not observe any activity above the background oxidation of Fe(II) by molecular oxygen. Here we used isothermal titration calorimetry to study Zn(II) and Fe(II) binding to the natural E2 domain of APP, and we employed the transferrin assay and oxygen consumption measurements to test the ferroxidase activity of the E2 domain. We found that this domain neither in the presence nor in the absence of the E1 domain binds Fe(II) and it is not able to catalyze the oxidation of Fe(II). Binding of Cu(II) to the E2 domain did not induce ferroxidase activity contrary to the presence of redox active Cu(II) centers in ceruloplasmin or hephaestin. Thus, we conclude that E2 or E1 domains of APP do not have ferroxidase activity and that the potential involvement of APP as a ferroxidase in the pathology of Alzheimer’s disease must be re-evaluated.
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49
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Stull JA, Stich TA, Hurst JK, Britt RD. Electron Paramagnetic Resonance Analysis of a Transient Species Formed During Water Oxidation Catalyzed by the Complex Ion [(bpy)2Ru(OH2)]2O4+. Inorg Chem 2013; 52:4578-86. [DOI: 10.1021/ic4001158] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Jamie A. Stull
- Department of Chemistry, University of California−Davis, One Shields
Avenue, Davis, California 95616, United States
| | - Troy A. Stich
- Department of Chemistry, University of California−Davis, One Shields
Avenue, Davis, California 95616, United States
| | - James K. Hurst
- Department of Chemistry, Washington State University, Pullman, Washington 99164-4630, United
States
| | - R. David Britt
- Department of Chemistry, University of California−Davis, One Shields
Avenue, Davis, California 95616, United States
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50
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Mendieta-Wejebe JE, Miliar-García Á, Correa-Basurto J, Sánchez-Rico C, Ramírez-Rosales D, Trujillo-Ferrara J, Rosales-Hernández MC. Comparison of the effect of chronic cadmium exposure on the antioxidant defense systems of kidney and brain in rat. Toxicol Mech Methods 2013; 23:329-36. [DOI: 10.3109/15376516.2012.757687] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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