51
|
Chu KT, Liu YC, Huang YL, Lee GH, Tseng MC, Chiang MH. Redox Communication within Multinuclear Iron-Sulfur Complexes Related to Electronic Interplay in the Active Site of [FeFe]Hydrogenase. Chemistry 2015; 21:6852-61. [DOI: 10.1002/chem.201406101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Indexed: 11/08/2022]
|
52
|
Deb T, Jensen MP. Electrophilic alkylation of pseudotetrahedral nickel(II) arylthiolate complexes. Inorg Chem 2015; 54:87-96. [PMID: 25494529 DOI: 10.1021/ic5018328] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A kinetic study is reported for reactions of pseudotetrahedral nickel(II) arylthiolate complexes [(Tp(R,Me))Ni-SAr] (Tp(R,Me) = hydrotris{3-R-5-methyl-1-pyrazolyl}borate, R = Me, Ph, and Ar = C6H5, C6H4-4-Cl, C6H4-4-Me, C6H4-4-OMe, 2,4,6-Me3C6H2, 2,4,6-(i)Pr3C6H2) with organic electrophiles R'X (i.e., MeI, EtI, BzBr) in low-polarity organic solvents (toluene, THF, chloroform, dichloromethane, or 1,2-dichloroethane), yielding a pseudotetrahedral halide complex [(Tp(R,Me))Ni-X] (X = Cl, Br, I) and the corresponding organosulfide R'SAr. Competitive reactions with halogenated solvents and adventitious air were also examined. Akin to reactions of analogous and biomimetic zinc complexes, a pertinent mechanistic question is the nature of the reactive nucleophile, either an intact thiolate complex or a free arylthiolate resulting from a dissociative pre-equilibrium. The observed kinetics conformed to a second-order rate law, first order with respect to the complex and electrophile, and no intermediate complexes were observed. In the absence of a mechanistically diagnostic rate law, a variety of mechanistic probes were examined, including kinetic effects of varying the metal, solvent, electrophile, and temperature, as well as the 3-pyrazolyl and arylthiolate substituents. Compared to zinc analogues, the effect of Ni-SAr covalency is also of interest herein. The results are broadly interpreted with respect to the disparate mechanistic pathways.
Collapse
Affiliation(s)
- Tapash Deb
- Department of Chemistry and Biochemistry, Ohio University , Athens, Ohio 45701, United States
| | | |
Collapse
|
53
|
Koch F, Schubert H, Sirsch P, Berkefeld A. Binuclear complexes of Ni(i) from 4-terphenyldithiophenol. Dalton Trans 2015; 44:13315-24. [DOI: 10.1039/c5dt01178g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The preparation and characterisation of binuclear Ni(i) complexes from a 4-terphenyldithiophenol ligand is described.
Collapse
Affiliation(s)
- Felix Koch
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - Peter Sirsch
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| | - Andreas Berkefeld
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- 72076 Tübingen
- Germany
| |
Collapse
|
54
|
Kurian R, Bruce MRM, Bruce AE, Amar FG. The influence of zinc(ii) on thioredoxin/glutathione disulfide exchange: QM/MM studies to explore how zinc(ii) accelerates exchange in higher dielectric environments. Metallomics 2015; 7:1265-73. [DOI: 10.1039/c5mt00070j] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
QM/MM calculations on thiolate disulfide exchange reveal that a polar, 4-centered, cyclic transition state is formed when Zn(ii) is present, helping to explain faster exchange rates in higher dielectric solvents for metal-assisted exchange.
Collapse
Affiliation(s)
- Roby Kurian
- Department of Chemistry
- University of Maine
- Orono, USA
| | | | | | | |
Collapse
|
55
|
Varadwaj PR, Varadwaj A, Jin BY. Ligand(s)-to-metal charge transfer as a factor controlling the equilibrium constants of late first-row transition metal complexes: revealing the Irving–Williams thermodynamical series. Phys Chem Chem Phys 2015; 17:805-11. [DOI: 10.1039/c4cp03953j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ligand(s)-to-metal charge transfer obtained from QTAIM charges unravel the Irving–William series for the equilibrium constants of late first-row bivalent metal ions.
Collapse
Affiliation(s)
| | - Arpita Varadwaj
- Department of Chemistry
- National Taiwan University
- Taipei
- Taiwan
| | - Bih-Yaw Jin
- Department of Chemistry
- National Taiwan University
- Taipei
- Taiwan
| |
Collapse
|
56
|
Mondragón A, Flores-Alamo M, Martínez-Alanis PR, Aullón G, Ugalde-Saldívar VM, Castillo I. Electrocatalytic Proton Reduction by Dimeric Nickel Complex of a Sterically Demanding Pincer-type NS2 Aminobis(thiophenolate) Ligand. Inorg Chem 2014; 54:619-27. [DOI: 10.1021/ic502547y] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
| | | | | | - Gabriel Aullón
- Departament de Química Inorgànica and Institut de Química
Teòrica i Computacional, Universitat de Barcelona, Martí
i Franquès 1-11, 08028 Barcelona, Spain
| | | | | |
Collapse
|
57
|
Deb T, Anderson CM, Chattopadhyay S, Ma H, Young VG, Jensen MP. Steric and electronic effects on arylthiolate coordination in the pseudotetrahedral complexes [(Tp(Ph,Me))Ni-SAr] (Tp(Ph,Me) = hydrotris{3-phenyl-5-methyl-1-pyrazolyl}borate). Dalton Trans 2014; 43:17489-99. [PMID: 25341014 DOI: 10.1039/c4dt02726d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis and characterization of several new pseudotetrahedral arylthiolate complexes [(Tp(Ph,Me))Ni-SAr] (Tp(Ph,Me) = hydrotris{3-phenyl-5-methyl-1-pyrazolyl}borate; Ar = Ph, 2,4,6-(i)Pr3C6H2, C6H4-4-Cl, C6H4-4-Me, C6H4-4-OMe) are reported, including X-ray crystal structures of the first two complexes. With prior results, two series of complexes are spanned, [(Tp(Ph,Me))Ni-S-2,4,6-RC6H2] (R'' = H, Me, (i)Pr) plus the xylyl analogue [(Tp(Ph,Me))Ni-S-2,6-Me2C6H3], as well as [(Tp(Ph,Me))Ni-S-C6H4-4-Y] (Y = Cl, H, Me, OMe), intended to elucidate steric and/or electronic effects on arylthiolate coordination. In contrast to [(Tp(Me,Me))Ni-SAr] analogues that adopt a sawhorse conformation, the ortho-disubstituted complexes show enhanced trigonal and Ni-S-Ar bending, reflecting the size of the 3-pyrazole substituents. Moreover, weakened scorpionate ligation is implied by spectroscopic data. Little spectroscopic effect is observed in the series of para-substituted complexes, suggesting the observed effects are primarily steric in origin. The relatively electron-rich and encumbered complex [(Tp(Ph,Me))Ni-S-2,4,6-(i)Pr3C6H2] behaves uniquely when dissolved in CH3CN, forming a square planar solvent adduct with a bidentate scorpionate ligand, [(κ(2)-Tp(Ph,Me))Ni(NCMe)(S-2,4,6-(i)Pr3C6H2)]. This adduct was isolated and characterized by X-ray crystallography. Single-point DFT and TD-DFT calculations on a simplified [(κ(2)-Tp)Ni(NCMe)(SPh)] model were used to clarify the electronic spectrum of the adduct, and to elucidate differences between Ni-SAr bonding and spectroscopy between pseudotetrahedral and square planar geometries.
Collapse
Affiliation(s)
- Tapash Deb
- Department of Chemistry and Biochemistry, Ohio University, Athens, Ohio 45701, USA.
| | | | | | | | | | | |
Collapse
|
58
|
|
59
|
Coutinho LH, Gardenghi DJ, Schlachter AS, de Souza GGB, Stolte WC. Positive and negative ion formation in deep-core excited molecules: S 1s excitation in dimethyl sulfoxide. J Chem Phys 2014; 140:024314. [PMID: 24437884 DOI: 10.1063/1.4861050] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
The photo-fragmentation of the dimethyl sulfoxide (DMSO) molecule was studied using synchrotron radiation and a magnetic mass spectrometer. The total cationic yield spectrum was recorded in the photon energy region around the sulfur K edge. The sulfur composition of the highest occupied molecular orbital's and lowest unoccupied molecular orbital's in the DMSO molecule has been obtained using both ab initio and density functional theory methods. Partial cation and anion-yield measurements were obtained in the same energy range. An intense resonance is observed at 2475.4 eV. Sulfur atomic ions present a richer structure around this resonant feature, as compared to other fragment ions. The yield curves are similar for most of the other ionic species, which we interpret as due to cascade Auger processes leading to multiply charged species which then undergo Coulomb explosion. The anions S(-), C(-), and O(-) are observed for the first time in deep-core-level excitation of DMSO.
Collapse
Affiliation(s)
- L H Coutinho
- Physics Institute, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-972, Brazil
| | - D J Gardenghi
- Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003, USA
| | - A S Schlachter
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
| | - G G B de Souza
- Chemistry Institute, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21949-900, Brazil
| | - W C Stolte
- Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003, USA
| |
Collapse
|
60
|
Hall N, Orio M, Jorge-Robin A, Gennaro B, Marchi-Delapierre C, Duboc C. Vanadium Thiolate Complexes for Efficient and Selective Sulfoxidation Catalysis: A Mechanistic Investigation. Inorg Chem 2013; 52:13424-31. [DOI: 10.1021/ic4017504] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Nikita Hall
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CNRS, UMR-5250 Département
de Chimie Moléculaire, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble, FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
- TGE Réseau National de RPE interdisciplinaire, FR-3443, 75231 Paris Cedex 05, France
| | - Maylis Orio
- TGE Réseau National de RPE interdisciplinaire, FR-3443, 75231 Paris Cedex 05, France
- Univ Lille Nord de France, UDSL, CNRS UMR
8516, BP 83, 59000 Lille, France
- Laboratoire de Spectrochimie
Infrarouge et Raman, CNRS LASIR-UMR 8516, Bat C4 59655 Villeneuve d’Ascq Cedex, France
| | - Adeline Jorge-Robin
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CEA, iRTSV, LCBM, 38054 Grenoble, France
- CNRS, UMR 5249, Grenoble, France
| | - Béatrice Gennaro
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CNRS, UMR-5250 Département
de Chimie Moléculaire, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble, FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Caroline Marchi-Delapierre
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CEA, iRTSV, LCBM, 38054 Grenoble, France
- CNRS, UMR 5249, Grenoble, France
| | - Carole Duboc
- Univ Grenoble Alpes 38041 Grenoble Cedex 9, France
- CNRS, UMR-5250 Département
de Chimie Moléculaire, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble, FR-CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
- TGE Réseau National de RPE interdisciplinaire, FR-3443, 75231 Paris Cedex 05, France
| |
Collapse
|
61
|
Heterologous expression and metal-binding characterization of a type 1 metallothionein isoform (OsMTI-1b) from rice (Oryza sativa). Protein J 2013; 32:131-7. [PMID: 23385446 DOI: 10.1007/s10930-013-9469-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Metallothioneins (MTs) are ubiquitous, low molecular mass and cysteine-rich proteins that play important roles in maintaining intracellular metal homeostasis, eliminating metal toxification and protecting the cells against oxidative damages. MTs are able to bind metal ions through the thiol groups of their cysteine residues. Plants have several MT isoforms which are classified into four types based on the arrangement of cysteine residues. In the present study, a rice (Oryza sativa) gene encoding type 1 MT isoform, OsMTI-1b, was inserted in vector pET41a and overexpressed in Escherichia coli as carboxy-terminal extensions of glutathione-S-transferase (GST). The recombinant protein GST-OsMTI-1b was purified using affinity chromatography and its ability to bind with Ni(2+), Cd(2+), Zn(2+) and Cu(2+) ions was analyzed. The results demonstrated that this isoform has ability to bind Ni(2+), Cd(2+) and Zn(2+) ions in vitro, whereas it has no substantial ability to bind Cu(2+) ions. From competitive reaction with 5,5'-dithiobis(2-nitrobenzoic acid), DTNB, the affinity of metal ions for recombinant form of GST-OsMTI-1b was as follows: Ni(2+)/Cd(2+) > Zn(2+) > Cu(2+).
Collapse
|
62
|
Arantes GM, Bhattacharjee A, Field MJ. Homolytic Cleavage of FeS Bonds in Rubredoxin under Mechanical Stress. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201303462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
63
|
Arantes GM, Bhattacharjee A, Field MJ. Homolytic Cleavage of FeS Bonds in Rubredoxin under Mechanical Stress. Angew Chem Int Ed Engl 2013; 52:8144-6. [DOI: 10.1002/anie.201303462] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2013] [Indexed: 11/07/2022]
|
64
|
Zheng P, Takayama SIJ, Mauk AG, Li H. Single Molecule Force Spectroscopy Reveals That Iron Is Released from the Active Site of Rubredoxin by a Stochastic Mechanism. J Am Chem Soc 2013; 135:7992-8000. [DOI: 10.1021/ja402150q] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Peng Zheng
- Department of Chemistry, University of British Columbia, Vancouver, British
Columbia V6T 1Z1, Canada
| | - Shin-ichi J. Takayama
- Department of Biochemistry and
Molecular Biology and the Center for Blood Research, University of British Columbia, Vancouver, British
Columbia V6T 1Z3, Canada
| | - A. Grant Mauk
- Department of Biochemistry and
Molecular Biology and the Center for Blood Research, University of British Columbia, Vancouver, British
Columbia V6T 1Z3, Canada
| | - Hongbin Li
- Department of Chemistry, University of British Columbia, Vancouver, British
Columbia V6T 1Z1, Canada
| |
Collapse
|
65
|
Zhang D, Bin Y, Tallorin L, Tse F, Hernandez B, Mathias EV, Stewart T, Bau R, Selke M. Sequential photooxidation of a Pt(II) (diimine)cysteamine complex: intermolecular oxygen atom transfer versus sulfinate formation. Inorg Chem 2013; 52:1676-8. [PMID: 23356398 PMCID: PMC3609715 DOI: 10.1021/ic3020578] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The thiolato complex [platinum(II) (bipyridine)(N,S-aminoethanethiolate)](+)Ch(-) (1) undergoes sequential reactions with singlet oxygen to initially form the corresponding sulfenato complex [platinum(II) (bipyridine)(N,S(═O)-aminoethansulfenate)](+) (2) followed by a much slower reaction to the corresponding sulfinato complex. In contrast with many platinum dithiolato complexes, 1 does not produce any singlet oxygen, but its rate constant for singlet oxygen removal (k(T)) is quite large (3.2 × 10(7) M(-1) s(-1)) and chemical reaction accounts for ca. 25% of the value of k(T). The behavior of 1 is strikingly different from that of the complex platinum(II) (bipyridine)(1,2-benzenditholate) (4). The latter complex reacts with (1)O(2) (either from an external sensitizer or via a self-sensitized pathway) to form a sulfinato complex. These two very different reactivity pathways imply different mechanistic pathways: The reaction of 1 with (1)O(2) must involve O-O bond cleavage and intermolecular oxygen atom transfer, while the reactive intermediate in complex 4 collapses intramolecularly to the sulfinato moiety.
Collapse
Affiliation(s)
- Dong Zhang
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| | - Ye Bin
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| | - Lorillee Tallorin
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| | - Florence Tse
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| | - Blanca Hernandez
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| | - Errol V. Mathias
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| | - Timothy Stewart
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Robert Bau
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Matthias Selke
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, California 90032, United States
| |
Collapse
|
66
|
|
67
|
He Y, Bin Y, Liang Y, Xiang J. Density functional investigation of the molecular structures, vibrational and absorption spectra of metal thiolate complexes, M(SC6H5)3 (M=As, Sb or Bi). COMPUT THEOR CHEM 2012. [DOI: 10.1016/j.comptc.2012.06.023] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
68
|
Eisenberg AS, Likhtina IV, Znamenskiy VS, Birke RL. Electronic Spectroscopy and Computational Studies of Glutathionylco(III)balamin. J Phys Chem A 2012; 116:6851-69. [DOI: 10.1021/jp301294x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Azaria S. Eisenberg
- Department of Chemistry, The City
College of New York,
and The Graduate School and University Center, The City University of New York, New York, New York 10031, United
States
| | - Iya V. Likhtina
- Department of Chemistry, The City
College of New York,
and The Graduate School and University Center, The City University of New York, New York, New York 10031, United
States
| | - Vasiliy S. Znamenskiy
- Department of Chemistry, The City
College of New York,
and The Graduate School and University Center, The City University of New York, New York, New York 10031, United
States
| | - Ronald L. Birke
- Department of Chemistry, The City
College of New York,
and The Graduate School and University Center, The City University of New York, New York, New York 10031, United
States
| |
Collapse
|
69
|
Paletta-Silva R, Vieira-Bernardo R, Cosentino-Gomes D, Meyer-Fernandes JR. Leishmania amazonensis: Inhibition of 3′-nucleotidase activity by Cu2+ ions. Exp Parasitol 2012; 131:63-8. [DOI: 10.1016/j.exppara.2012.03.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2011] [Revised: 02/28/2012] [Accepted: 03/01/2012] [Indexed: 11/17/2022]
|
70
|
Gorelsky SI. Complexes with a Single Metal–Metal Bond as a Sensitive Probe of Quality of Exchange-Correlation Functionals. J Chem Theory Comput 2012; 8:908-14. [DOI: 10.1021/ct3000124] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Serge I. Gorelsky
- Centre for Catalysis
Research and Innovation and the
Department of Chemistry, University of Ottawa, Ottawa, Ontario K1N
6N5, Canada
| |
Collapse
|
71
|
Maret W. New perspectives of zinc coordination environments in proteins. J Inorg Biochem 2011; 111:110-6. [PMID: 22196021 DOI: 10.1016/j.jinorgbio.2011.11.018] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Revised: 10/21/2011] [Accepted: 11/08/2011] [Indexed: 11/24/2022]
Abstract
Zinc is more widely used as a cofactor in proteins than any other transition metal ion. In addition to catalytic and structural functions, zinc(II) ions have a role in information transfer and cellular control. They bind transiently when proteins regulate zinc concentrations and re-distribute zinc and when proteins are regulated by zinc. Transient zinc-binding sites employ the same donors of amino acid side chains as catalytic and structural sites but differ in their coordination chemistry that can modulate zinc affinities over at least ten orders of magnitude. Redox activity of the cysteine ligands, multiple binding modes of the oxygen, sulfur and nitrogen donors, and protein conformational changes induce coordination dynamics in zinc sites and zinc ion mobility. Functional annotations of the remarkable variation of coordination environments in zinc proteomes need to consider how the primary coordination spheres interact with protein structure and dynamics, and the adaptation of coordination properties to the biological context in extracellular, cellular, or subcellular locations.
Collapse
Affiliation(s)
- Wolfgang Maret
- Metal Metabolism Group, Diabetes and Nutritional Sciences Division, School of Medicine, King's College London, London, UK
| |
Collapse
|
72
|
Gennari M, Retegan M, DeBeer S, Pécaut J, Neese F, Collomb MN, Duboc C. Experimental and Computational Investigation of Thiolate Alkylation in NiII and ZnII Complexes: Role of the Metal on the Sulfur Nucleophilicity. Inorg Chem 2011; 50:10047-55. [DOI: 10.1021/ic200899w] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Marcello Gennari
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Marius Retegan
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Serena DeBeer
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, United States
| | - Jacques Pécaut
- Laboratoire de Reconnaissance Ionique et Chimie de Coordination, Service de Chimie Inorganique et Biologique, UMR E-3 CEA/UJF, CNRS, CEA-Grenoble, INAC, 17 Rue des Martyrs 38054 Grenoble Cedex 9, France
| | - Frank Neese
- Institute for Physical and Theoretical Chemistry, Universität Bonn, Wegelerstrasse 12, D-53113 Bonn, Germany
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Marie-Noëlle Collomb
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| | - Carole Duboc
- Université Joseph Fourier Grenoble 1/CNRS, Département de Chimie Moléculaire, UMR-5250, Laboratoire de Chimie Inorganique Redox, Institut de Chimie Moléculaire de Grenoble FR, CNRS-2607, BP-53, 38041 Grenoble Cedex 9, France
| |
Collapse
|
73
|
Zheng P, Li H. Direct measurements of the mechanical stability of zinc-thiolate bonds in rubredoxin by single-molecule atomic force microscopy. Biophys J 2011; 101:1467-73. [PMID: 21943428 DOI: 10.1016/j.bpj.2011.08.021] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2011] [Revised: 07/28/2011] [Accepted: 08/09/2011] [Indexed: 01/09/2023] Open
Abstract
Zinc (Zn) is one of the most abundant metals and is essential for life. Through ligand interactions, often with thiolate from cysteine residues in proteins, Zn can play important structural roles in organizing protein structure and augmenting protein folding and stability. However, it is difficult to separate the contributions of Zn-ligand interactions from those originating from intrinsic protein folding in experimental studies of Zn-containing metalloproteins, which makes the study of Zn-ligand interactions in proteins challenging. Here, we used single-molecule force spectroscopy to directly measure the mechanical rupture force of the Zn-thiolate bond in Zn-rubredoxin. Our results show that considerable force is needed to rupture Zn-thiolate bonds (~170 pN, which is significantly higher than the force necessary to rupture the coordination bond between Zn and histidines). To our knowledge, our study not only provides new information about Zn-thiolate bonds in rubredoxin, it also opens a new avenue for studying metal-ligand bonds in proteins using single-molecule force spectroscopy.
Collapse
Affiliation(s)
- Peng Zheng
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia, Canada
| | | |
Collapse
|
74
|
McKinnon SDJ, Patrick BO, Lever ABP, Hicks RG. Electronic Structure Investigations of Neutral and Charged Ruthenium Bis(β-diketonate) Complexes of Redox-Active Verdazyl Radicals. J Am Chem Soc 2011; 133:13587-603. [DOI: 10.1021/ja204575u] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Stephen D. J. McKinnon
- Department of Chemistry, University of Victoria, P.O. Box 3065 STN CSC, Victoria, BC. V8W 3V6, Canada
| | - Brian O. Patrick
- Crystallography Laboratory, Department of Chemistry, University of British Columbia, Vancouver, BC, V6T 1Z1, Canada
| | - A. B. P. Lever
- Department of Chemistry, York University, Toronto, Ontario, M3J 1P3, Canada
| | - Robin G. Hicks
- Department of Chemistry, University of Victoria, P.O. Box 3065 STN CSC, Victoria, BC. V8W 3V6, Canada
| |
Collapse
|
75
|
Zheng P, Cao Y, Li H. Facile method of constructing polyproteins for single-molecule force spectroscopy studies. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2011; 27:5713-5718. [PMID: 21486060 DOI: 10.1021/la200915d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Constructing polyproteins consisting of identical tandem repeats of proteins provides an unambiguous method of investigating the mechanical properties of proteins at the single-molecule level using force spectroscopy techniques. Here we report a maleimide-thiol coupling-based facile method of constructing polyproteins for single-molecule force spectroscopy studies on the mechanical properties of proteins. This method allows for the construction of polyproteins in an efficient fashion under room temperature. The resultant thioether bonds are resistant to reduction and make it possible to carry out single-molecule force spectroscopy studies under various redox conditions. This novel method complements existing polyprotein engineering methods and can be easily applied to a wide variety of proteins.
Collapse
Affiliation(s)
- Peng Zheng
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | | | | |
Collapse
|
76
|
Chaboy J, Díaz-Moreno S, Díaz-Moreno I, De la Rosa MA, Díaz-Quintana A. How the local geometry of the Cu-binding site determines the thermal stability of blue copper proteins. ACTA ACUST UNITED AC 2011; 18:25-31. [PMID: 21276936 DOI: 10.1016/j.chembiol.2010.12.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2010] [Revised: 12/09/2010] [Accepted: 12/10/2010] [Indexed: 12/16/2022]
Abstract
Identifying the factors that govern the thermal resistance of cupredoxins is essential for understanding their folding and stability, and for improving our ability to design highly stable enzymes with potential biotechnological applications. Here, we show that the thermal unfolding of plastocyanins from two cyanobacteria--the mesophilic Synechocystis and the thermophilic Phormidium--is closely related to the short-range structure around the copper center. Cu K-edge X-ray absorption spectroscopy shows that the bond length between Cu and the S atom from the cysteine ligand is a key structural factor that correlates with the thermal stability of the cupredoxins in both oxidized and reduced states. These findings were confirmed by an additional study of a site-directed mutant of Phormidium plastocyanin showing a reverse effect of the redox state on the thermal stability of the protein.
Collapse
Affiliation(s)
- Jesús Chaboy
- Instituto de Ciencia de Materiales de Aragón, Consejo Superior de Investigaciones Científicas-Universidad de Zaragoza, 50009 Zaragoza, Spain.
| | | | | | | | | |
Collapse
|
77
|
Zheng P, Li H. Highly Covalent Ferric−Thiolate Bonds Exhibit Surprisingly Low Mechanical Stability. J Am Chem Soc 2011; 133:6791-8. [DOI: 10.1021/ja200715h] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Peng Zheng
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| | - Hongbin Li
- Department of Chemistry, University of British Columbia, Vancouver, BC V6T 1Z1, Canada
| |
Collapse
|
78
|
Gamiz-Hernandez AP, Kieseritzky G, Ishikita H, Knapp EW. Rubredoxin Function: Redox Behavior from Electrostatics. J Chem Theory Comput 2011; 7:742-52. [DOI: 10.1021/ct100476h] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ana Patricia Gamiz-Hernandez
- Institute of Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Fabeckstrasse 36a, D-14195, Berlin, Germany
| | - Gernot Kieseritzky
- Institute of Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Fabeckstrasse 36a, D-14195, Berlin, Germany
| | - Hiroshi Ishikita
- Career-Path Promotion Unit for Young Life Scientists, Kyoto University, 202 Building E, Graduate School of Medicine, Yoshida-Konoe-cho, Sakyo-ku, Kyoto 606-8501, Japan
| | - E. W. Knapp
- Institute of Chemistry and Biochemistry, Department of Biology, Chemistry and Pharmacy, Freie Universität Berlin, Fabeckstrasse 36a, D-14195, Berlin, Germany
| |
Collapse
|
79
|
Importance of iron as the metal ion in peptide deformylase: a biomimetic computational study. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0827-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
80
|
Maganas D, Grigoropoulos A, Staniland SS, Chatziefthimiou SD, Harrison A, Robertson N, Kyritsis P, Neese F. Tetrahedral and square planar Ni[(SPR(2))(2)N](2) complexes, R = Ph & (i)Pr revisited: experimental and theoretical analysis of interconversion pathways, structural preferences, and spin delocalization. Inorg Chem 2010; 49:5079-93. [PMID: 20462270 DOI: 10.1021/ic100163g] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Sulfur-containing mono- or bidentate types of ligands, usually form square planar Ni((II))S(4) complexes. However, it has already been established that the bidentate L(-) dithioimidodiphosphinato ligands, [R(2)P(S)NP(S)R'(2)](-), R, and R' = aryl or alkyl, can afford both tetrahedral and square planar, NiS(4)-containing, homoleptic Ni(R,R')L(2) complexes, owing to an apparent structural flexibility, which has not, so far, been probed. In this work, the literature tetrahedral Ni[R(2)P(S)NP(S)R(2)](2) complexes, R = Ph (Ni(Ph,Ph)L(2), 1(Td)) and R = (i)Pr (Ni(iPr,iPr)L(2), 2) as well as the newly synthesized Ni[(i)Pr(2)P(S)NP(S)Ph(2)](2) complex (Ni(iPr,Ph)L(2), 3), have been studied by UV-vis, IR, and (31)P NMR spectroscopy. Complex 3 was shown by X-ray crystallography to be square planar, and magnetic studies confirmed that it is diamagnetic in the solid state. However, it becomes paramagnetic in solution, as it shows a similar UV-vis spectrum to one of the tetrahedral 1(Td) and 2 complexes. The crystal structure of the potassium salt of the asymmetric ligand, [(i)Pr(2)P(S)NP(S)Ph(2)]K, has also been determined and compared to those of the protonated (i)Pr(2)P(S)NHP(S)Ph(2) ligand and complex 3. All three, 1(Td), 2, and 3, Ni(R,R')L(2) complexes show strong paramagnetic effects in their solution (31)P NMR spectra. The magnetic properties of paramagnetic complexes 1 and 2 in the solid state were investigated on oriented crystals, and their analysis afforded remarkably small values of the spin-orbit coupling constant (lambda) and orbital reduction factor (k) parameters, implying significant delocalization of unpaired electronic density toward the ligands. The above experimental findings are combined with data from standard density functional theory and correlated multiconfiguration ab initio theoretical methods, in an effort to investigate the interplay between the square planar and tetrahedral geometries of the NiS(4) core, the mechanistic pathway for the spin-state interconversion, the degree of covalency of the Ni-S bonds, and the distribution of the spin density in this type of system. The analysis provides justification for the structural flexibility of such ligands, affording Ni(R,R')L(2) complexes with variable metallacycle conformation and NiS(4) core geometries. Of particular importance are the large zero-field splitting values estimated by both experimental and theoretical means, which have not, as yet, been verified by direct methods, such as electron paramagnetic resonance spectroscopy. The findings of our work confirm earlier observations on the feasibility of synthesizing either tetrahedral or square planar NiS(4) complexes containing the same type of ligands. They can also form the basis of investigating structure-properties relationships in other NiS(4)-containing systems.
Collapse
Affiliation(s)
- Dimitrios Maganas
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, GR-157 71 Athens, Greece
| | | | | | | | | | | | | | | |
Collapse
|
81
|
Lever A. Electronic characteristics of an extensive series of ruthenium complexes with the non-innocent o-benzoquinonediimine ligand: A pedagogical approach. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2010.02.022] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
82
|
Pérez-Llamazares A, Galbán-Malagón CJ, Aboal JR, Angel Fernández J, Carballeira A. Evaluation of cations and chelating agents as extracellular extractants for Cu, Pb, V and Zn in the sequential elution technique applied to the terrestrial moss Pseudoscleropodium purum. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2010; 73:507-514. [PMID: 20092897 DOI: 10.1016/j.ecoenv.2009.12.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2009] [Revised: 09/30/2009] [Accepted: 12/12/2009] [Indexed: 05/28/2023]
Abstract
Three experiments were carried out to select the best extractant for use in the sequential elution technique, to enable extraction of Cu, Pb, V and Zn from the extracellular fraction of the terrestrial moss Pseudoscleropodium purum. The optimal concentrations of the extractants tested (CoCl(2), NiCl(2), Pb(NO(3))(2), SrCl(2), dimercaprol, EDTA, penicillamine) were determined on the basis of the maximum extraction of Zn achieved without any alteration of the plasma membrane. The capacity of these agents (at the optimal concentrations established) to extract the extracellular fractions of Cu, Pb, V and Zn was then evaluated. Extraction with 10mM EDTA is recommended for all 4 elements considered. As a second option, the use of 50mM penicillamine is recommended to extract Cu, 30 mM dimercaprol to extract Pb and V and 20 mM NiCl(2) to extract Zn. It was also concluded that these results cannot be extrapolated to other cryptogams, and that separate assays are required.
Collapse
Affiliation(s)
- Alicia Pérez-Llamazares
- Ecología, Departamento de Biología Celular y Ecología, Facultad de Biología, Universidad de Santiago de Compostela, 15782, Santiago de Compostela, Spain.
| | | | | | | | | |
Collapse
|
83
|
Campos-Bermudez VA, Morán-Barrio J, Costa-Filho AJ, Vila AJ. Metal-dependent inhibition of glyoxalase II: a possible mechanism to regulate the enzyme activity. J Inorg Biochem 2010; 104:726-31. [PMID: 20385411 DOI: 10.1016/j.jinorgbio.2010.03.005] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2009] [Revised: 02/15/2010] [Accepted: 03/09/2010] [Indexed: 11/25/2022]
Abstract
Glyoxalase II (GLX2, EC 3.1.2.6., hydroxyacylglutathione hydrolase) is a metalloenzyme involved in crucial detoxification pathways. Different studies have failed in identifying the native metal ion of this enzyme, which is expressed with iron, zinc and/or manganese. Here we report that GloB, the GLX2 from Salmonella typhimurium, is differentially inhibited by glutathione (a reaction product) depending on the bound metal ion, and we provide a structural model for this inhibition mode. This metal-dependent inhibition was shown to occur in metal-enriched forms of the enzyme, complementing the spectroscopic data. Based on the high levels of free glutathione in the cell, we suggest that the expression of the different metal forms of GLX2 during Salmonella infection could be exploited as a mechanism to regulate the enzyme activity.
Collapse
Affiliation(s)
- Valeria A Campos-Bermudez
- IBR (Instituto de Biología Molecular y Celular de Rosario), Consejo Nacional de Investigaciones Científicas y Técnicas, Facultad de Ciencias Bioquímicas y Farmacéuticas, Universidad Nacional de Rosario, Suipacha 531, S2002LRK, Rosario, Argentina.
| | | | | | | |
Collapse
|
84
|
Gámiz-Hernández AP, Galstyan AS, Knapp EW. Understanding Rubredoxin Redox Potentials: Role of H-Bonds on Model Complexes. J Chem Theory Comput 2009; 5:2898-908. [DOI: 10.1021/ct900328c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ana Patricia Gámiz-Hernández
- Institute of Chemistry and Biochemistry, Department of Biology, Chemistry, and Pharmacy, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| | - Artur S. Galstyan
- Institute of Chemistry and Biochemistry, Department of Biology, Chemistry, and Pharmacy, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| | - Ernst-Walter Knapp
- Institute of Chemistry and Biochemistry, Department of Biology, Chemistry, and Pharmacy, Freie Universität Berlin, Fabeckstrasse 36a, D-14195 Berlin, Germany
| |
Collapse
|
85
|
Pang K, Figueroa JS, Tonks IA, Sattler W, Parkin G. 2-Mercapto-1-t-butylimidazolyl as a Bridging Ligand: Synthesis and Structural Characterization of Nickel and Palladium Paddlewheel Complexes. Inorganica Chim Acta 2009; 362:4609-4615. [PMID: 20161357 PMCID: PMC2777662 DOI: 10.1016/j.ica.2009.05.025] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nickel and palladium paddlewheel complexes that feature 2-mercapto-1-t-butylimidazolyl (mim(Bu(t) )) bridging ligands, namely Ni(2)[mim (Bu(t) )](4) and Pd(2)[mim (Bu(t) )](4), have been synthesized and structurally characterized by X-ray diffraction. Since the mim (Bu(t) ) ligand bridges in an asymmetric manner via a sulfur and nitrogen donor, paddlewheel compounds of the type M(2)[mim (Bu(t) )](4) may exist as isomers that are distinguished by the relative orientations of the ligands. In this regard, the (4,0)-Ni(2)[mim (Bu(t) )](4) and trans-(2,2)-Ni(2)[mim (Bu(t) )](4) isomers have been isolated for the nickel system, while the (4,0)-Pd(2)[mim (Bu(t) )](4) and (3,1)-Pd(2)[mim (Bu(t) )](4) isomers have been isolated for the palladium system.
Collapse
Affiliation(s)
- Keliang Pang
- Department of Chemistry, Columbia University, New York, New York 10027, USA
| | | | | | | | | |
Collapse
|
86
|
Sriskandakumar T, Petzold H, Bruijnincx PCA, Habtemariam A, Sadler PJ, Kennepohl P. Influence of Oxygenation on the Reactivity of Ruthenium−Thiolato Bonds in Arene Anticancer Complexes: Insights from XAS and DFT. J Am Chem Soc 2009; 131:13355-61. [DOI: 10.1021/ja903405z] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Thamayanthy Sriskandakumar
- The University of British Columbia, Department of Chemistry, Vancouver BC V6T 1Z1, Canada, University of Warwick, Department of Chemistry, Coventry CV4 7AL, United Kingdom, and University of Edinburgh, School of Chemistry, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Holm Petzold
- The University of British Columbia, Department of Chemistry, Vancouver BC V6T 1Z1, Canada, University of Warwick, Department of Chemistry, Coventry CV4 7AL, United Kingdom, and University of Edinburgh, School of Chemistry, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Pieter C. A. Bruijnincx
- The University of British Columbia, Department of Chemistry, Vancouver BC V6T 1Z1, Canada, University of Warwick, Department of Chemistry, Coventry CV4 7AL, United Kingdom, and University of Edinburgh, School of Chemistry, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Abraha Habtemariam
- The University of British Columbia, Department of Chemistry, Vancouver BC V6T 1Z1, Canada, University of Warwick, Department of Chemistry, Coventry CV4 7AL, United Kingdom, and University of Edinburgh, School of Chemistry, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Peter J. Sadler
- The University of British Columbia, Department of Chemistry, Vancouver BC V6T 1Z1, Canada, University of Warwick, Department of Chemistry, Coventry CV4 7AL, United Kingdom, and University of Edinburgh, School of Chemistry, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Pierre Kennepohl
- The University of British Columbia, Department of Chemistry, Vancouver BC V6T 1Z1, Canada, University of Warwick, Department of Chemistry, Coventry CV4 7AL, United Kingdom, and University of Edinburgh, School of Chemistry, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| |
Collapse
|
87
|
Su P, Li H. Energy decomposition analysis of covalent bonds and intermolecular interactions. J Chem Phys 2009; 131:014102. [DOI: 10.1063/1.3159673] [Citation(s) in RCA: 749] [Impact Index Per Article: 49.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
88
|
|
89
|
The two distinctive metal ion binding domains of the wheat metallothionein Ec-1. J Inorg Biochem 2009; 103:342-53. [DOI: 10.1016/j.jinorgbio.2008.11.008] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2008] [Revised: 11/12/2008] [Accepted: 11/18/2008] [Indexed: 11/23/2022]
|
90
|
Schicht O, Freisinger E. Spectroscopic characterization of Cicer arietinum metallothionein 1. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.03.097] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
91
|
Sottini S, Mathies G, Gast P, Maganas D, Kyritsis P, Groenen EJ. A W-band pulsed EPR/ENDOR study of CoIIS4 coordination in the Co[(SPPh2)(SPiPr2)N]2 complex. Phys Chem Chem Phys 2009; 11:6727-32. [DOI: 10.1039/b905726a] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
92
|
Sizova OV, Skripnikov LV, Sokolov AY. Symmetry decomposition of quantum chemical bond orders. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2008.08.021] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
|
93
|
O'Toole MG, Kreso M, Kozlowski PM, Mashuta MS, Grapperhaus CA. Spin-state-dependent oxygen sensitivity of iron dithiolates: sulfur oxygenation or disulfide formation. J Biol Inorg Chem 2008; 13:1219-30. [PMID: 18633652 DOI: 10.1007/s00775-008-0405-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2008] [Accepted: 06/25/2008] [Indexed: 10/21/2022]
Abstract
The oxygen sensitivity of two related iron(III) dithiolate complexes of the ligand [4,7-bis-(2'-methyl-2'-mercatopropyl)-1-thia-4,7-diazacyclononane], (bmmp-TASN)FeCN (1) and (bmmp-TASN)FeCl (2), has been examined. Oxygen exposure of the low-spin complex 1 yields the disulfonate complex (bmmp-O6-TASN)FeCN (3) as an olive-green solid with characteristic peaks in the IR spectrum at 1262, 1221, 1111, 1021, 947, 800, and 477 cm(-1). The corresponding nickel dithiolate, (bmmp-TASN)Ni (4), yields the related disulfonato derivative, (bmmp-O6-TASN)Ni (5) upon addition of H2O2 (IR bands at 1258, 1143, 1106, 1012, 800, and 694 cm(-1). Oxygen exposure of the high-spin complex 2 results in disulfide formation and decomplexation of the metal with subsequent iron-oxo cluster formation. Complexes 1 and 2 were examined using density functional theory calculations. A natural bond order/natural localized molecular orbital covalency analysis reveals that the low-spin complex 1 contains Fe-Sthiolate bonds with calculated covalencies of 75 and 86%, while the high-spin complex 2 contains Fe-Sthiolate bonds with calculated covalencies of 11 and 40%. The results indicate the degree of covalency of the Fe-S bonds plays a major role in determining the reaction pathway associated with oxygen exposure of iron thiolates. The X-ray structures of 1, 4, and 5 are reported.
Collapse
Affiliation(s)
- Martin G O'Toole
- Department of Chemistry, University of Louisville, Louisville, KY 40292, USA
| | | | | | | | | |
Collapse
|
94
|
Experimental evidence for a link among cupredoxins: red, blue, and purple copper transformations in nitrous oxide reductase. Proc Natl Acad Sci U S A 2008; 105:7919-24. [PMID: 18535143 DOI: 10.1073/pnas.0711316105] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The cupredoxin fold is an important motif in numerous proteins that are central to several critical cellular processes ranging from aerobic and anaerobic respiration to catalysis and iron homeostasis. Three types of copper sites have been found to date within cupredoxin folds: blue type 1 (T1) copper, red type 2 (T2) copper, and purple Cu(A). Although as much as 90% sequence difference has been observed among some members of this superfamily of proteins that span several kingdoms, sequence alignment and phylogenic trees strongly suggest an evolutionary link and common ancestry. However, experimental evidence for such a link has been lacking. We report herein the observation of pH-dependent transformation between blue T1 copper, red T2 copper, and the native purple Cu(A) centers of nitrous oxide reductase (N2OR) from Paracoccus denitrificans. The blue and red copper centers form initially before they are transformed into purple Cu(A) center. This transformation process is pH-dependent, with lower pH resulting in fewer trapped T1 and T2 coppers and faster transition to purple Cu(A). These observations suggest that the purple Cu(A) site contains the essential elements of T1 and T2 copper centers and that the Cu(A) center is preferentially formed at low pH. Therefore, this work provides an underlying link between the various cupredoxin copper sites and possible experimental evidence in vitro for the evolutionary relationship between the cupredoxin proteins. The findings also lend physiological relevance to cupredoxin site biosynthesis.
Collapse
|
95
|
Sarangi R, Gorelsky SI, Basumallick L, Hwang HJ, Pratt RC, Stack TDP, Lu Y, Hodgson KO, Hedman B, Solomon EI. Spectroscopic and density functional theory studies of the blue-copper site in M121SeM and C112SeC azurin: Cu-Se versus Cu-S bonding. J Am Chem Soc 2008; 130:3866-77. [PMID: 18314977 PMCID: PMC2713798 DOI: 10.1021/ja076495a] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
S K-edge X-ray absorption, UV-vis absorption, magnetic circular dichroism (MCD), and resonance Raman spectroscopies are used to investigate the electronic structure differences among WT, M121SeM, and C112SeC Pseudomonas aeruginosa (P.a) azurin. A comparison of S K-edge XAS of WT and M121SeM azurin and a CuII-thioether model complex shows that the 38% S character in the ground state wave function of the blue-copper (BC) sites solely reflects the Cu-SCys bond. Resonance Raman (rR) data on WT and C112SeC azurin give direct evidence for the kinematic coupling between the Cu-SCys stretch and the cysteine deformation modes in WT azurin, which leads to multiple features in the rR spectrum of the BC site. The UV-vis absorption and MCD data on WT, M121SeM, and C112SeC give very similar C0/D0 ratios, indicating that the C-term MCD intensity mechanism involves Cu-centered spin-orbit coupling (SOC). The spectroscopic data combined with density functional theory (DFT) calculations indicate that SCys and SeCys have similar covalent interactions with Cu at their respective bond lengths of 2.1 and 2.3 A. This reflects the similar electronegativites of S and Se in the thiolate/selenolate ligand fragment and explains the strong spectroscopic similarities between WT and C112SeC azurin.
Collapse
|
96
|
Arteaga-Müller R, Sánchez-Nieves J, Ramos J, Royo P, Mosquera MEG. Isolobal Zwitterionic Niobium and Tantalum Imido and Zirconium Monocyclopentadienyl Complexes: Theoretical and Methyl Methacrylate Polymerization Studies. Organometallics 2008. [DOI: 10.1021/om701068h] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rocío Arteaga-Müller
- Departamento de Química Inorgánica, Universidad de Alcalá, Campus Universitario, E-28871 Alcalá de Henares, Madrid, Spain, and Grupo de Estructura Molecular y Propiedades de Polimeros, Instituto de Estructura de la Materia, CSIC, Serrano 113bis, 28006, Madrid, Spain
| | - Javier Sánchez-Nieves
- Departamento de Química Inorgánica, Universidad de Alcalá, Campus Universitario, E-28871 Alcalá de Henares, Madrid, Spain, and Grupo de Estructura Molecular y Propiedades de Polimeros, Instituto de Estructura de la Materia, CSIC, Serrano 113bis, 28006, Madrid, Spain
| | - Javier Ramos
- Departamento de Química Inorgánica, Universidad de Alcalá, Campus Universitario, E-28871 Alcalá de Henares, Madrid, Spain, and Grupo de Estructura Molecular y Propiedades de Polimeros, Instituto de Estructura de la Materia, CSIC, Serrano 113bis, 28006, Madrid, Spain
| | - Pascual Royo
- Departamento de Química Inorgánica, Universidad de Alcalá, Campus Universitario, E-28871 Alcalá de Henares, Madrid, Spain, and Grupo de Estructura Molecular y Propiedades de Polimeros, Instituto de Estructura de la Materia, CSIC, Serrano 113bis, 28006, Madrid, Spain
| | - Marta E. G. Mosquera
- Departamento de Química Inorgánica, Universidad de Alcalá, Campus Universitario, E-28871 Alcalá de Henares, Madrid, Spain, and Grupo de Estructura Molecular y Propiedades de Polimeros, Instituto de Estructura de la Materia, CSIC, Serrano 113bis, 28006, Madrid, Spain
| |
Collapse
|
97
|
Freisinger E. Plant MTs—long neglected members of the metallothionein superfamily. Dalton Trans 2008:6663-75. [DOI: 10.1039/b809789e] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
98
|
Picot D, Ohanessian G, Frison G. Thermodynamic Stability Versus Kinetic Lability of ZnS4Core. Chem Asian J 2008; 5:1445-54. [DOI: 10.1002/asia.200900624] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
99
|
Figueroa JS, Yurkerwich K, Melnick J, Buccella D, Parkin G. Applications of bis(1-R-imidazol-2-yl)disulfides and diselenides as ligands for main-group and transition metals: kappa2-(N,N) coordination, S-S bond cleavage, and S-S/E-E (E = S, Se) bond metathesis reactions. Inorg Chem 2007; 46:9234-44. [PMID: 17900186 PMCID: PMC2440639 DOI: 10.1021/ic701228y] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Bis(1-R-imidazol-2-yl)disulfides, (mim(R))2 (R = Ph, Bu(t)), and diselenides, (seim(Mes))2, serve as bidentate N,N-donor ligands for main-group and transition metals. For example, [kappa2-(mim(Bu)(t))2]MCl2 (M = Fe, Co, Ni, Zn), [kappa2-(mim(Ph))2]MCl2 (M = Co, Zn), [kappa2-(mim(Bu)(t))2]CuX (X = Cl, I), and [kappa2-(seim(Mes))2]MCl2 (M = Fe, Co, Ni) are obtained by treatment of (mim(Bu)(t))2 or (seim(Mes))2 with the respective metal halide and have been structurally characterized by X-ray diffraction. On the other hand, the zerovalent nickel complex Ni(PMe3)4 effects cleavage of the disulfide bond of (mim(Bu)(t))2 to give square-planar trans-Ni(PMe3)2(mim(Bu)(t))2 in which the (mim(Bu)(t)) ligands coordinate via nitrogen rather than sulfur, a most uncommon coordination mode for this class of ligands. Although [kappa2-(mim(R))2]MCl2 (M = Fe, Co, Ni, Zn) are not subject to homolytic cleavage of the S-S bond because the tetravalent state is not readily accessible, the observation that [kappa2-(mimPh)2]CoCl2 and [kappa2-(mim(Bu)(t))2]CoCl2 form an equilibrium mixture with the asymmetric disulfide [kappa2-(mim(Ph))(mim(Bu)(t))]CoCl2 indicates that S-S bond cleavage via another mechanism is possible. Likewise, metathesis between disulfide and diselenide ligands is observed in the formation of [kappa2-(mim(Bu)(t))(seim(Mes))]CoCl2 upon treatment of [kappa2-(mim(Bu)(t))2]CoCl2 with [kappa2-(seim(Mes))2]CoCl2.
Collapse
Affiliation(s)
- Joshua S Figueroa
- Department of Chemistry, Columbia University, New York, NY 10027, USA
| | | | | | | | | |
Collapse
|
100
|
Dey A, Green KN, Jenkins RM, Jeffrey SP, Darensbourg M, Hodgson KO, Hedman B, Solomon EI. S K-edge XAS and DFT calculations on square-planar NiII-thiolate complexes: effects of active and passive H-bonding. Inorg Chem 2007; 46:9655-60. [PMID: 17949080 DOI: 10.1021/ic7006292] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
S K-edge XAS for a low-spin NiII-thiolate complex shows a 0.2 eV shift to higher pre-edge energy but no change in Ni-S bond covalency upon H-bonding. This is different from the H-bonding effect we observed in high-spin FeIII-thiolate complexes where there is a significant decrease in Fe-S bond covalency but no change in energy due to H-bonding (Dey, A.; Okamura, T.-A.; Ueyama, N.; Hedman, B.; Hodgson, K. O.; Solomon, E. I. J. Am. Chem. Soc. 2005, 127, 12046-12053). These differences were analyzed using DFT calculations, and the results indicate that two different types of H-bonding interactions are possible in metal-thiolate systems. In the high-spin FeIII-thiolate case, the H-bonding involves a thiolate donor orbital which is also involved in bonding with the metal (active), while in the low-spin NiII-thiolate, the orbital involved in H-bonding is nonbonding with respect to the M-S bonding (passive). The contributions of active and passive H-bonds to the reduction potential and Lewis acid properties of a metal center are evaluated.
Collapse
Affiliation(s)
- Abhishek Dey
- Department of Chemistry, Stanford University, Stanford, California 94305, USA
| | | | | | | | | | | | | | | |
Collapse
|