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Boncella AE, Sabo ET, Santore RM, Carter J, Whalen J, Hudspeth JD, Morrison CN. The expanding utility of iron-sulfur clusters: Their functional roles in biology, synthetic small molecules, maquettes and artificial proteins, biomimetic materials, and therapeutic strategies. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214229] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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2
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Tahara K, Ashihara Y, Ikeda T, Kadoya T, Fujisawa JI, Ozawa Y, Tajima H, Toyoda N, Haruyama Y, Abe M. Immobilizing a π-Conjugated Catecholato Framework on Surfaces of SiO 2 Insulator Films via a One-Atom Anchor of a Platinum Metal Center to Modulate Organic Transistor Performance. Inorg Chem 2020; 59:17945-17957. [PMID: 33169615 DOI: 10.1021/acs.inorgchem.0c02163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Chemical modification of insulating material surfaces is an important methodology to improve the performance of organic field-effect transistors (OFETs). However, few redox-active self-assembled monolayers (SAMs) have been constructed on gate insulator film surfaces, in contrast to the numerous SAMs formed on many types of conducting electrodes. In this study, we report a new approach to introduce a π-conjugated organic fragment in close proximity to an insulating material surface via a transition metal center acting as a one-atom anchor. On the basis of the reported coordination chemistry of a catecholato complex of Pt(II) in solution, we demonstrate that ligand exchange can occur on an insulating material surface, affording SAMs on the SiO2 surface derived from a newly synthesized Pt(II) complex containing a benzothienobenzothiophene (BTBT) framework in the catecholato ligand. The resultant SAMs were characterized in detail by water contact angle measurements, X-ray photoelectron spectroscopy, atomic force microscopy, and cyclic voltammetry. The SAMs served as good scaffolds of π-conjugated pillars for forming thin films of a well-known organic semiconductor C8-BTBT (2,7-dioctyl[1]benzothieno[3,2-b][1]benzothiophene), accompanied by the engagements of the C8-BTBT molecules with the SAMs containing the common BTBT framework at the first layer on SiO2. OFETs containing the SAMs displayed improved performance in terms of hole mobility and onset voltage, presumably because of the unique interfacial structure between the organic semiconducting and inorganic insulating layers. These findings provide important insight into creating new elaborate interfaces through installing coordination chemistry in solution to solid surfaces, as well as OFET design by considering the compatibility between SAMs and organic semiconductors.
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Affiliation(s)
- Keishiro Tahara
- Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo 6781297, Japan
| | - Yuya Ashihara
- Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo 6781297, Japan
| | - Takashi Ikeda
- Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo 6781297, Japan
| | - Tomofumi Kadoya
- Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo 6781297, Japan
| | - Jun-Ichi Fujisawa
- Graduate School of Science and Technology, Gunma University, 1-5-1, Tenjin, Kiryu, Gunma 3768515, Japan
| | - Yoshiki Ozawa
- Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo 6781297, Japan
| | - Hiroyuki Tajima
- Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo 6781297, Japan
| | - Noriaki Toyoda
- Graduate School of Engineering, University of Hyogo, 2167, Shosha, Himeji, Hyogo 6712280, Japan
| | - Yuichi Haruyama
- Laboratory of Advanced Science and Technology for Industry, University of Hyogo, 3-1-2 Koto, Kamigori, Ako, Hyogo 6781205, Japan
| | - Masaaki Abe
- Graduate School of Material Science, University of Hyogo, 3-2-1, Kouto, Kamigori, Ako, Hyogo 6781297, Japan
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Importance of the iron-sulfur component and of the siroheme modification in the resting state of sulfite reductase. J Inorg Biochem 2019; 203:110928. [PMID: 31756559 DOI: 10.1016/j.jinorgbio.2019.110928] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 11/24/2022]
Abstract
The active site of sulfite reductase (SiR) consists of an unusual siroheme-Fe4S4 assembly coupled via a cysteinate sulfur, and serves for multi-electron reduction reactions. Clear explanations have not been demonstrated for the reasons behind the choice of siroheme (vs. other types of heme) or for the single-atom coupling to an Fe4S4 center (as opposed to simple adjacency or to coupling via chains consisting of more than one atom). Possible explanations for these choices have previously been invoked, relating to the control of the spin state of the substrate-binding (siro)heme iron, modulation of the trans effect of the (Fe4S4-bound) cysteinate, or modulation of the redox potential. Reported here is a density functional theory (DFT) investigation of the structural interplay (in terms of geometry, molecular orbitals and magnetic interactions) between the siroheme and the Fe4S4 center as well as the importance of the covalent modifications within siroheme compared to the more common heme b, aiming to verify the role of the siroheme modification and of the Fe4S4 cluster at the SiR active site, with focus on previously-formulated hypotheses (geometrical/sterics, spin state, redox and electron-transfer control). A calibration of various DFT methods/variants for the correct description of ground state spin multiplicity is performed using a set of problematic cases of bioinorganic Fe centers; out of 11 functionals tested, M06-L and B3LYP offer the best results - though none of them correctly predict the spin state for all test cases. Upon examination of the relative energies of spin states, reduction potentials, energy decomposition (electrostatic, exchange-repulsion, orbital relaxation, correlation and dispersion interactions) and Mayer bond indices in SiR models, the following main roles of the siroheme and cubane are identified: (1) the cubane cofactor decreases the reduction potential of the siroheme and stabilizes the siroheme-cysteine bond interaction, and (2) the siroheme removes the quasi-degeneracy between the intermediate and high-spin states found in ferrous systems by preserving the latter as ground state; the higher-spin preference and the increased accessibility of multiple spin states are likely to be important in selective binding of the substrate and of the subsequent reaction intermediates, and in efficient changes in redox states throughout the catalytic cycle.
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Das B, Al-Hunaiti A, Sánchez-Eguía BN, Zeglio E, Demeshko S, Dechert S, Braunger S, Haukka M, Repo T, Castillo I, Nordlander E. Di- and Tetrairon(III) μ-Oxido Complexes of an N3S-Donor Ligand: Catalyst Precursors for Alkene Oxidations. Front Chem 2019; 7:97. [PMID: 30881952 PMCID: PMC6405480 DOI: 10.3389/fchem.2019.00097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2018] [Accepted: 02/04/2019] [Indexed: 12/03/2022] Open
Abstract
The new di- and tetranuclear Fe(III) μ-oxido complexes [Fe4(μ-O)4(PTEBIA)4](CF3SO3)4(CH3CN)2] (1a), [Fe2(μ-O)Cl2(PTEBIA)2](CF3SO3)2 (1b), and [Fe2(μ-O)(HCOO)2(PTEBIA)2](ClO4)2 (MeOH) (2) were prepared from the sulfur-containing ligand (2-((2,4-dimethylphenyl)thio)-N,N-bis ((1-methyl-benzimidazol-2-yl)methyl)ethanamine (PTEBIA). The tetrairon complex 1a features four μ-oxido bridges, while in dinuclear 1b, the sulfur moiety of the ligand occupies one of the six coordination sites of each Fe(III) ion with a long Fe-S distance of 2.814(6) Å. In 2, two Fe(III) centers are bridged by one oxido and two formate units, the latter likely formed by methanol oxidation. Complexes 1a and 1b show broad sulfur-to-iron charge transfer bands around 400–430 nm at room temperature, consistent with mononuclear structures featuring Fe-S interactions. In contrast, acetonitrile solutions of 2 display a sulfur-to-iron charge transfer band only at low temperature (228 K) upon addition of H2O2/CH3COOH, with an absorption maximum at 410 nm. Homogeneous oxidative catalytic activity was observed for 1a and 1b using H2O2 as oxidant, but with low product selectivity. High valent iron-oxo intermediates could not be detected by UV-vis spectroscopy or ESI mass spectrometry. Rather, evidence suggest preferential ligand oxidation, in line with the relatively low selectivity and catalytic activity observed in the reactions.
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Affiliation(s)
- Biswanath Das
- Chemical Physics, Department of Chemistry, Lund University, Lund, Sweden
| | - Afnan Al-Hunaiti
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, Helsinki, Finland
| | | | - Erica Zeglio
- Chemical Physics, Department of Chemistry, Lund University, Lund, Sweden
| | - Serhiy Demeshko
- Institute for Inorganic Chemistry, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Sebastian Dechert
- Institute for Inorganic Chemistry, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Steffen Braunger
- Institute for Inorganic Chemistry, Georg-August-Universität Göttingen, Göttingen, Germany
| | - Matti Haukka
- Department of Chemistry, University of Jyväskylä, Jyväskylä, Finland
| | - Timo Repo
- Laboratory of Inorganic Chemistry, Department of Chemistry, University of Helsinki, Helsinki, Finland
| | - Ivan Castillo
- Instituto de Química, Universidad Nacional Autónoma de México, Mexico, Mexico
| | - Ebbe Nordlander
- Chemical Physics, Department of Chemistry, Lund University, Lund, Sweden
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Bergner M, Roy L, Dechert S, Neese F, Ye S, Meyer F. Ligand Rearrangements at Fe/S Cofactors: Slow Isomerization of a Biomimetic [2Fe-2S] Cluster. Angew Chem Int Ed Engl 2017; 56:4882-4886. [DOI: 10.1002/anie.201612621] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2016] [Indexed: 02/01/2023]
Affiliation(s)
- Marie Bergner
- Universität Göttingen; Institut für Anorganische Chemie; Tammannstrasse 4 37077 Göttingen Germany
| | - Lisa Roy
- Max-Planck-Institut für Chemische Energiekonversion; Stiftstrasse 34-36 45470 Mülheim an der Ruhr Germany
| | - Sebastian Dechert
- Universität Göttingen; Institut für Anorganische Chemie; Tammannstrasse 4 37077 Göttingen Germany
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion; Stiftstrasse 34-36 45470 Mülheim an der Ruhr Germany
| | - Shengfa Ye
- Max-Planck-Institut für Chemische Energiekonversion; Stiftstrasse 34-36 45470 Mülheim an der Ruhr Germany
| | - Franc Meyer
- Universität Göttingen; Institut für Anorganische Chemie; Tammannstrasse 4 37077 Göttingen Germany
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Bergner M, Roy L, Dechert S, Neese F, Ye S, Meyer F. Ligandenumlagerungen an Fe/S-Cofaktoren: langsame Isomerisierung eines biomimetischen [2Fe-2S]-Clusters. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201612621] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Marie Bergner
- Universität Göttingen; Institut für Anorganische Chemie; Tammannstraße 4 37077 Göttingen Deutschland
| | - Lisa Roy
- Max-Planck-Institut für Chemische Energiekonversion; Stiftstraße 34-36 45470 Mülheim an der Ruhr Deutschland
| | - Sebastian Dechert
- Universität Göttingen; Institut für Anorganische Chemie; Tammannstraße 4 37077 Göttingen Deutschland
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion; Stiftstraße 34-36 45470 Mülheim an der Ruhr Deutschland
| | - Shengfa Ye
- Max-Planck-Institut für Chemische Energiekonversion; Stiftstraße 34-36 45470 Mülheim an der Ruhr Deutschland
| | - Franc Meyer
- Universität Göttingen; Institut für Anorganische Chemie; Tammannstraße 4 37077 Göttingen Deutschland
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7
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Dong YW, Fan RQ, Wang XM, Wang P, Zhang HJ, Wei LG, Song Y, Du X, Chen W, Yang YL. Topological Evolution in Mercury(II) Schiff Base Complexes Tuned through Alkyl Substitution - Synthesis, Solid-State Structures, and Aggregation-Induced Emission Properties. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600231] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yu-Wei Dong
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Rui-Qing Fan
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Xin-Ming Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Ping Wang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Hui-Jie Zhang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Li-Guo Wei
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Yang Song
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Xi Du
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Wei Chen
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
| | - Yu-Lin Yang
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage; School of Chemistry and Chemical Engineering; Harbin Institute of Technology; 92, Xidazhi Street Nangang District 150001 Harbin P. R. China
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8
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Zanello P. The competition between chemistry and biology in assembling iron–sulfur derivatives. Molecular structures and electrochemistry. Part II. {[Fe2S2](SγCys)4} proteins. Coord Chem Rev 2014. [DOI: 10.1016/j.ccr.2014.08.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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9
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Khavasi HR, Tahrani AA. The role of secondary bonding on supramolecular assembly of coordination compounds: diversity of coordination modes and supramolecular structures. CrystEngComm 2013. [DOI: 10.1039/c3ce40433a] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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10
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Rodriguez MM, Bill E, Brennessel WW, Holland PL. N₂reduction and hydrogenation to ammonia by a molecular iron-potassium complex. Science 2011; 334:780-3. [PMID: 22076372 DOI: 10.1126/science.1211906] [Citation(s) in RCA: 394] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The most common catalyst in the Haber-Bosch process for the hydrogenation of dinitrogen (N(2)) to ammonia (NH(3)) is an iron surface promoted with potassium cations (K(+)), but soluble iron complexes have neither reduced the N-N bond of N(2) to nitride (N(3-)) nor produced large amounts of NH(3) from N(2). We report a molecular iron complex that reacts with N(2) and a potassium reductant to give a complex with two nitrides, which are bound to iron and potassium cations. The product has a Fe(3)N(2) core, implying that three iron atoms cooperate to break the N-N triple bond through a six-electron reduction. The nitride complex reacts with acid and with H(2) to give substantial yields of N(2)-derived ammonia. These reactions, although not yet catalytic, give structural and spectroscopic insight into N(2) cleavage and N-H bond-forming reactions of iron.
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Affiliation(s)
- Meghan M Rodriguez
- Department of Chemistry, University of Rochester, Rochester, NY 14627, USA
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11
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Eichhöfer A, Buth G, Dolci F, Fink K, Mole RA, Wood PT. Homoleptic 1-D iron selenolate complexes—synthesis, structure, magnetic and thermal behaviour of 1∞[Fe(SeR)2] (R = Ph, Mes). Dalton Trans 2011; 40:7022-32. [DOI: 10.1039/c1dt10089k] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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12
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Fiethen SA, Staemmler V, Nair NN, Ribas-Arino J, Schreiner E, Marx D. Revealing the magnetostructural dynamics of [2Fe-2S] ferredoxins from reduced-dimensionality analysis of antiferromagnetic exchange coupling fluctuations. J Phys Chem B 2010; 114:11612-9. [PMID: 20718446 DOI: 10.1021/jp1014912] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Metalloproteins are biomolecular hybrids composed of an "inorganic core" embedded in a "bioorganic matrix". Cofactors typically contain transition metal clusters with complex electronic structure whereas the protein host undergoes dynamics on many length and time scales. This renders computational studies of spectroscopic properties challenging, in particular, when magnetic interactions are involved. In the present study we introduce a simplified description of the antiferromagnetic exchange coupling J in reduced dimensionality which allows one to study magnetostructural dynamics of [2Fe-2S] type iron-sulfur proteins in their oxidized form by molecular dynamics. It is demonstrated that parametrization in terms of a 2D J-surface faithfully reproduces the rigorous results both in vacuo and in Anabaena ferredoxin. In particular, we present a parametrization which relies on a spin-projected density functional approach based on two Kohn-Sham determinants corrected for self-interaction via a self-consistent linear-response Hubbard-U technique. This yields an average J for Anabaena Fd in close agreement with experimental in vitro results without any specific adjustment or fitting. The analytical J-surface can be used for [2Fe-2S] proteins in their oxidized form in general and the idea can be extended to other metalloproteins as well as to other spectroscopic properties.
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Affiliation(s)
- S Annamaria Fiethen
- Lehrstuhl für Theoretische Chemie, Ruhr-Universität Bochum, 44780 Bochum, Germany
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13
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Meyer S, Demeshko S, Dechert S, Meyer F. Synthesis, structure and Mössbauer characterization of polymeric iron(II) complexes with bidentate thiourea ligands. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.04.015] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Fuchs MGG, Dechert S, Demeshko S, Ryde U, Meyer F. A Five-Coordinate [2Fe−2S] Cluster. Inorg Chem 2010; 49:5853-8. [DOI: 10.1021/ic902559n] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Michael G. G. Fuchs
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077 Göttingen, Germany, and Department of Theoretical Chemistry, Lund University, Chemical Centre, P.O. Box 124, 221 00 Lund, Sweden
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077 Göttingen, Germany, and Department of Theoretical Chemistry, Lund University, Chemical Centre, P.O. Box 124, 221 00 Lund, Sweden
| | - Serhiy Demeshko
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077 Göttingen, Germany, and Department of Theoretical Chemistry, Lund University, Chemical Centre, P.O. Box 124, 221 00 Lund, Sweden
| | - Ulf Ryde
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077 Göttingen, Germany, and Department of Theoretical Chemistry, Lund University, Chemical Centre, P.O. Box 124, 221 00 Lund, Sweden
| | - Franc Meyer
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077 Göttingen, Germany, and Department of Theoretical Chemistry, Lund University, Chemical Centre, P.O. Box 124, 221 00 Lund, Sweden
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15
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Fuchs MGG, Meyer F, Ryde U. A combined computational and experimental investigation of the [2Fe-2S] cluster in biotin synthase. J Biol Inorg Chem 2010; 15:203-12. [PMID: 19768473 PMCID: PMC2804791 DOI: 10.1007/s00775-009-0585-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2009] [Accepted: 09/04/2009] [Indexed: 11/19/2022]
Abstract
Biotin synthase was the first example of what is now regarded as a distinctive enzyme class within the radical S-adenosylmethionine superfamily, the members of which use Fe/S clusters as the sulphur source in radical sulphur insertion reactions. The crystal structure showed that this enzyme contains a [2Fe-2S] cluster with a highly unusual arginine ligand, besides three normal cysteine ligands. However, the crystal structure is at such a low resolution that neither the exact coordination mode nor the role of this exceptional ligand has been elucidated yet, although it has been shown that it is not essential for enzyme activity. We have used quantum refinement of the crystal structure and combined quantum mechanical and molecular mechanical calculations to explore possible coordination modes and their influences on cluster properties. The investigations show that the protonation state of the arginine ligand has little influence on cluster geometry, so even a positively charged guanidinium moiety would be in close proximity to the iron atom. Nevertheless, the crystallised enzyme most probably contains a deprotonated (neutral) arginine coordinating via the NH group. Furthermore, the Fe...Fe distance seems to be independent of the coordination mode and is in perfect agreement with distances in other structurally characterised [2Fe-2S] clusters. The exceptionally large Fe...Fe distance found in the crystal structure could not be reproduced.
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Affiliation(s)
- Michael G. G. Fuchs
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse 4, 37077 Göttingen, Germany
| | - Ulf Ryde
- Department of Theoretical Chemistry, Lund University, Chemical Centre, P.O. Box 124, 221 00 Lund, Sweden
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16
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Eichhöfer A, Olkowska-Oetzel J, Fenske D, Fink K, Mereacre V, Powell AK, Buth G. Synthesis and Structure of an “Iron-Doped” Copper Selenide Cluster Molecule: [Cu30Fe2Se6(SePh)24(dppm)4]. Inorg Chem 2009; 48:8977-84. [DOI: 10.1021/ic900890n] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Andreas Eichhöfer
- Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany
| | - Jolanta Olkowska-Oetzel
- Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany
| | - Dieter Fenske
- Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany
- Institut für Anorganische Chemie der Universität Engesserstrasse, Geb. 30.45, 76128 Karlsruhe, Germany
| | - Karin Fink
- Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany
| | - Valeriu Mereacre
- Institut für Anorganische Chemie der Universität Engesserstrasse, Geb. 30.45, 76128 Karlsruhe, Germany
| | - Annie K. Powell
- Institut für Nanotechnologie, Forschungszentrum Karlsruhe, Postfach 3640, 76021 Karlsruhe, Germany
- Institut für Anorganische Chemie der Universität Engesserstrasse, Geb. 30.45, 76128 Karlsruhe, Germany
| | - Gernot Buth
- Institut für Synchrotronstrahlung (ISS), Forschungszentrum Karlsruhe GmbH, Postfach 3640, 76021 Karlsruhe, Germany
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17
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Ballmann J, Sun X, Dechert S, Schneider B, Meyer F. A convenient ligand exchange pathway to [2Fe–2S] ferredoxin analogues. Dalton Trans 2009:4908-17. [DOI: 10.1039/b901242g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Emami M, Teimouri A, Chermahini AN. Vibrational spectra and assignments using ab initio and density functional theory analysis on the structure of biotin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2008; 71:1516-1524. [PMID: 18586555 DOI: 10.1016/j.saa.2008.05.020] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2008] [Revised: 04/22/2008] [Accepted: 05/12/2008] [Indexed: 05/26/2023]
Abstract
Density functional theory (DFT) and Hartree-Fock calculations were performed using the following models: HF/6-311G(d), B3LYP/6-311G(d), B3LYP/6-311+G(d) and B3PW91/6-311G(d) calculations were performed for biotin. It has been characterized by IR and X-ray. The calculated results show that the predicted geometry can well reproduce the structural parameters. Predicted vibrational frequencies have been assigned and compared with experimental IR spectra and they supported each other. On the basis of vibrational analyses, the thermodynamic properties of the title compound at different temperatures have been calculated, revealing the correlations between Cp,m degrees, Sm degrees, Hm degrees and temperatures.
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Affiliation(s)
- Mohammad Emami
- Department of Chemistry, Shahid Beheshti University, Tehran, Iran.
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19
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Salicylaldoxime in manganese(III) carboxylate chemistry: Synthesis, structural characterization and physical studies of hexanuclear and polymeric complexes. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.08.021] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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20
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Ballmann J, Fuchs MGG, Dechert S, John M, Meyer F. Synthesis and Coordination Properties of Chelating Dithiophenolate Ligands. Inorg Chem 2008; 48:90-9. [PMID: 19035679 DOI: 10.1021/ic801285u] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joachim Ballmann
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Michael G. G. Fuchs
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Michael John
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, D-37077 Göttingen, Germany
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