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Liu C, Powell MM, Rao G, Britt RD, Rittle J. Bioinformatic Discovery of a Cambialistic Monooxygenase. J Am Chem Soc 2024; 146:1783-1788. [PMID: 38198693 PMCID: PMC10811679 DOI: 10.1021/jacs.3c12131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 01/05/2024] [Accepted: 01/08/2024] [Indexed: 01/12/2024]
Abstract
Dinuclear monooxygenases mediate challenging C-H bond oxidation reactions throughout nature. Many of these enzymes are presumed to exclusively utilize diiron cofactors. Herein we report the bioinformatic discovery of an orphan dinuclear monooxygenase that preferentially utilizes a heterobimetallic manganese-iron (Mn/Fe) cofactor to mediate an O2-dependent C-H bond hydroxylation reaction. Unlike the structurally similar Mn/Fe-dependent monooxygenase AibH2, the diiron form of this enzyme (SfbO) exhibits a nascent enzymatic activity. This behavior raises the possibility that many other dinuclear monooxygenases may be endowed with the capacity to harness cofactors with a variable metal content.
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Affiliation(s)
- Chang Liu
- Department
of Chemistry, University of California,
Berkeley, Berkeley, California 94720, United States
| | - Magan M. Powell
- Department
of Chemistry, University of California,
Berkeley, Berkeley, California 94720, United States
| | - Guodong Rao
- Department
of Chemistry, University of California,
Davis, Davis, California 95616, United States
| | - R. David Britt
- Department
of Chemistry, University of California,
Davis, Davis, California 95616, United States
| | - Jonathan Rittle
- Department
of Chemistry, University of California,
Berkeley, Berkeley, California 94720, United States
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2
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Shahid M, I . M, Khan S, Mehtab M, Yadav O, Ansari A, Qasem KM, Ahmed A, Saniya M, Akhtar MN, AlDamen MA. Elucidating the contribution of solvent on the catecholase activity in a mononuclear Cu(II) system: An experimental and theoretical approach. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130878] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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3
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McKee V, Kose M. Manganese(II) complexes derived from acyclic ligands having flexible alcohol arms: structural chracterization and SOD and catalase mimetic studies. Acta Crystallogr C 2021; 77:100-110. [DOI: 10.1107/s2053229621000395] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Accepted: 01/11/2021] [Indexed: 11/10/2022] Open
Abstract
In this work, a series of seven MnII complexes of noncyclic flexible ligands derived from 2,6-diformylpyridine and ethanolamine or alkyl-substituted ethanolamines were prepared and characterized, six structurally by single-crystal X-ray diffraction studies. The complexes are dichlorido{2,2′-[(pyridine-2,6-diyl)bis(nitrilomethanylylidene)]diethanol}manganese(II), [MnCl2(C11H15N3O2)] or [MnCl2(L1)], (2), bis{μ-2,2′-[(pyridine-2,6-diyl)bis(nitrilomethanylylidene)]diethanol}bis[dithiocyanatomanganese(II)], [Mn2(NCS)4(C11H15N3O2)2] or [Mn2(NCS)4(L1)2], (3), chlorido{1,1′-[(pyridine-2,6-diyl)bis(nitrilomethanylylidene)]bis(propan-2-ol)}manganese(II) chloride monohydrate, [MnCl(C13H19N3O2)(H2O)]Cl·H2O or [MnCl(L2)(H2O)]Cl·H2O, (4), {1,1′-[(pyridine-2,6-diyl)bis(nitrilomethanylylidene)]bis(propan-2-ol)}dithiocyanatomanganese(II), [Mn(NCS)2(C13H19N3O2)] or [Mn(NCS)2(L2)], (5), aquadichlorido{2,2′-dimethyl-2,2′-[(pyridine-2,6-diyl)bis(nitrilomethanylylidene)]bis(propan-1-ol)}manganese(II) 0.3-hydrate, [MnCl2(C15H23N3O2)(H2O)]·0.3H2O or [MnCl2(L3)(H2O)]·0.3H2O, (6), (dimethylformamide){2,2′-dimethyl-2,2′-[(pyridine-2,6-diyl)bis(nitrilomethanylylidene)]bis(propan-1-ol)}dithiocyanatomanganese(II), [Mn(NCS)2(C15H23N3O2)(C3H7NO)] or [Mn(NCS)2(L3)(DMF)], (7), and (dimethylformamide){2,2′-[(pyridine-2,6-diyl)bis(nitrilomethanylylidene)]bis(butan-1-ol)}dithiocyanatomanganese(II) dimethylformamide monosolvate, [Mn(NCS)2(C15H23N3O2)(C3H7NO)]·C3H7NO or [Mn(NCS)2(L4)(DMF)]·DMF, (8). The crystal structure of ligand L1 is also reported, but that of (5) is not. All four ligands (L1–L4) have five potential donor atoms in an N3O2 donor set, i.e. three N (pyridine/diimine donors) and two alcohol O atoms, to coordinate the MnII centre. The N3O2 donor set coordinates to the metal centre in a pentagonal planar arrangement; seven-coordinated MnII complexes were obtained via coordination of two auxiliary ligands (anions or water molecules) at the axial positions. However, in some cases, the alcohol O-atom donors remain uncoordinated, resulting in five- or six-coordinated MnII complexes. The structurally characterized complexes were tested for their catalytic scavenging of superoxide and peroxide. The results indicated that the complexes with coordinated exogenous water or chloride ligands showed higher SOD activity than those with exogenous thiocyanate ligands.
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Reactivity of 9-anthracenecarboxylate in the presence of Mn(II) and Mn(III) ions: Biomimetic aerobic oxidative decarboxylation catalysed by a manganese(III) 2,2′-bipyridine complex. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119949] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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5
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I. M, Shahid M, Kumar M, Ansari A, Akhtar MN, AlDamen MA, Song Y, Ahmad M, Khan IM. Exploring solvent dependent catecholase activity in transition metal complexes: an experimental and theoretical approach. NEW J CHEM 2020. [DOI: 10.1039/c9nj04374h] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Four coordination compounds are designed with pyridinemethanol ligands, characterized with spectral, magnetic and X-ray analyses, and assessed for catecholase activity in various solvents.
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Affiliation(s)
- Mantasha I.
- Department of Chemistry
- Aligarh Muslim University
- Aligarh-202002
- India
| | - M. Shahid
- Department of Chemistry
- Aligarh Muslim University
- Aligarh-202002
- India
| | - Manjeet Kumar
- Department of Chemistry
- Central University of Haryana
- Mahendergarh-123031
- India
| | - Azaj Ansari
- Department of Chemistry
- Central University of Haryana
- Mahendergarh-123031
- India
| | - Muhammad Nadeem Akhtar
- Department of Chemistry
- Khwaja Fareed University of Engineering & Information Technology
- Rahim Yar Khan 64200
- Pakistan
| | - Murad A. AlDamen
- Department of Chemistry
- Faculty of Science
- The University of Jordan
- Amman 11942
- Jordan
| | - You Song
- State Key Laboratory of Coordination Chemistry
- Nanjing University
- Nanjing 210023
- P. R. China
| | - Musheer Ahmad
- Department of Applied Chemistry (ZHCET)
- Aligarh Muslim University
- Aligarh-202002
- India
| | - Ishaat M. Khan
- Department of Chemistry
- Aligarh Muslim University
- Aligarh-202002
- India
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Superoxide Dismutase and Pseudocatalase Increase Tolerance to Hg(II) in Thermus thermophilus HB27 by Maintaining the Reduced Bacillithiol Pool. mBio 2019; 10:mBio.00183-19. [PMID: 30940703 PMCID: PMC6445937 DOI: 10.1128/mbio.00183-19] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Thermus thermophilus is a deep-branching thermophilic aerobe. It is a member of the Deinococcus-Thermus phylum that, together with the Aquificae, constitute the earliest branching aerobic bacterial lineages; therefore, this organism serves as a model for early diverged bacteria (R. K. Hartmann, J. Wolters, B. Kröger, S. Schultze, et al., Syst Appl Microbiol 11:243–249, 1989, https://doi.org/10.1016/S0723-2020(89)80020-7) whose natural heated habitat may contain mercury of geological origins (G. G. Geesey, T. Barkay, and S. King, Sci Total Environ 569-570:321–331, 2016, https://doi.org/10.1016/j.scitotenv.2016.06.080). T. thermophilus likely arose shortly after the oxidation of the biosphere 2.4 billion years ago. Studying T. thermophilus physiology provides clues about the origin and evolution of mechanisms for mercury and oxidative stress responses, the latter being critical for the survival and function of all extant aerobes. Mercury (Hg) is a widely distributed, toxic heavy metal with no known cellular role. Mercury toxicity has been linked to the production of reactive oxygen species (ROS), but Hg does not directly perform redox chemistry with oxygen. How exposure to the ionic form, Hg(II), generates ROS is unknown. Exposure of Thermus thermophilus to Hg(II) triggered ROS accumulation and increased transcription and activity of superoxide dismutase (Sod) and pseudocatalase (Pcat); however, Hg(II) inactivated Sod and Pcat. Strains lacking Sod or Pcat had increased oxidized bacillithiol (BSH) levels and were more sensitive to Hg(II) than the wild type. The ΔbshA Δsod and ΔbshA Δpcat double mutant strains were as sensitive to Hg(II) as the ΔbshA strain that lacks bacillithiol, suggesting that the increased sensitivity to Hg(II) in the Δsod and Δpcat mutant strains is due to a decrease of reduced BSH. Treatment of T. thermophilus with Hg(II) decreased aconitase activity and increased the intracellular concentration of free Fe, and these phenotypes were exacerbated in Δsod and Δpcat mutant strains. Treatment with Hg(II) also increased DNA damage. We conclude that sequestration of the redox buffering thiol BSH by Hg(II), in conjunction with direct inactivation of ROS-scavenging enzymes, impairs the ability of T. thermophilus to effectively metabolize ROS generated as a normal consequence of growth in aerobic environments.
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Vignesh KR, Langley SK, Gartshore CJ, Borilović I, Forsyth CM, Rajaraman G, Murray KS. Rationalizing the sign and magnitude of the magnetic coupling and anisotropy in dinuclear manganese(iii) complexes. Dalton Trans 2018; 47:11820-11833. [PMID: 29951677 DOI: 10.1039/c8dt01410h] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
We have synthesised twelve manganese(iii) dinuclear complexes, 1-12, in order to understand the origin of magnetic exchange (J) between the metal centres and the magnetic anisotropy (D) of each metal ion using a combined experimental and theoretical approach. All twelve complexes contain the same bridging ligand environment of one μ-oxo and two μ-carboxylato, that helped us to probe how the structural parameters, such as bond distance, bond angle and especially Jahn-Teller dihedral angle affect the magnetic behaviour. Among the twelve complexes, we found ferromagnetic coupling for five and antiferromagnetic coupling for seven. DFT computed the J and ab initio methods computed the D parameter, and are in general agreement with the experimentally determined values. The dihedral angle between the two Jahn-Teller axes of the constituent MnIII ions are found to play a key role in determining the sign of the magnetic coupling. Magneto-structural correlations are developed by varying the Mn-O distance and the Mn-O-Mn angle to understand how the magnetic coupling changes upon these structural changes. Among the developed correlations, the Mn-O distance is found to be the most sensitive parameter that switches the sign of the magnetic coupling from negative to positive. The single-ion zero-field splitting of the MnIII centres is found to be negative for complexes 1-11 and positive for complex 12. However, the zero-field splitting of the S = 4 state for the ferromagnetic coupled dimers is found to be positive, revealing a significant contribution from the exchange anisotropy - a parameter which has long been ignored as being too small to be effective.
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8
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Beal NJ, Corry TA, O'Malley PJ. Comparison of Experimental and Broken Symmetry Density Functional Theory Calculated Electron Paramagnetic Resonance Parameters for the Manganese Catalase Active Site in the Superoxidized Mn III/Mn IV State. J Phys Chem B 2018; 122:2881-2890. [PMID: 29470911 DOI: 10.1021/acs.jpcb.7b11649] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Broken symmetry density functional theory has been used to calculate g-tensor, 55Mn, 14N, and 17O hyperfine couplings for active site models of superoxidized MnIII/MnIV manganese catalase both in its native and azide-inhibited form. While a good agreement is found between the calculated and experimental g-tensor and 55Mn hyperfine couplings for all models, the active site geometry and Mn ion oxidation state can only be readily distinguished based on a comparison of the calculated and experimental 14N azide and 17O HFCs. This comparison shows that only models containing a Jahn-Teller distorted 5-coordinate (MnIII)2 site and a 6-coordinate (MnIV)1 site can satisfactorily reproduce the experimental 14N and 17O hyperfine couplings.
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Affiliation(s)
- Nathan J Beal
- School of Chemistry , The University of Manchester , Manchester M13 9PL , U.K
| | - Thomas A Corry
- School of Chemistry , The University of Manchester , Manchester M13 9PL , U.K
| | - Patrick J O'Malley
- School of Chemistry , The University of Manchester , Manchester M13 9PL , U.K
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9
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Stubbs AW, Braglia L, Borfecchia E, Meyer RJ, Román- Leshkov Y, Lamberti C, Dincă M. Selective Catalytic Olefin Epoxidation with MnII-Exchanged MOF-5. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02946] [Citation(s) in RCA: 94] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Amanda W. Stubbs
- Department
of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, Massachusetts 02139, United States
| | - Luca Braglia
- Department
of Chemistry, NIS and CrisDi Interdepartmental Centers, INSTM Reference
Center, University of Turin, Via P Giuria 7, I-10125 Turin, Italy
- International
research center “Smart Materials”, Southern Federal University, 5 Zorge Street, Rostov-on-Don 344090, Russia
| | - Elisa Borfecchia
- Department
of Chemistry, NIS and CrisDi Interdepartmental Centers, INSTM Reference
Center, University of Turin, Via P Giuria 7, I-10125 Turin, Italy
| | - Randall J. Meyer
- Corporate
Strategic Research, ExxonMobil Research and Engineering, 1545 Route 22, Annandale, New Jersey 08801, United States
| | - Yuriy Román- Leshkov
- Department
of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, Massachusetts 02139, United States
| | - Carlo Lamberti
- Department
of Chemistry, NIS and CrisDi Interdepartmental Centers, INSTM Reference
Center, University of Turin, Via P Giuria 7, I-10125 Turin, Italy
- International
research center “Smart Materials”, Southern Federal University, 5 Zorge Street, Rostov-on-Don 344090, Russia
| | - Mircea Dincă
- Department
of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts
Avenue, Cambridge, Massachusetts 02139, United States
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10
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Morton J, Chrysina M, Craig VSJ, Akita F, Nakajima Y, Lubitz W, Cox N, Shen JR, Krausz E. Structured near-infrared Magnetic Circular Dichroism spectra of the Mn 4CaO 5 cluster of PSII in T. vulcanus are dominated by Mn(IV) d-d 'spin-flip' transitions. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2017; 1859:88-98. [PMID: 29066392 DOI: 10.1016/j.bbabio.2017.10.004] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Revised: 10/17/2017] [Accepted: 10/19/2017] [Indexed: 01/13/2023]
Abstract
Photosystem II passes through four metastable S-states in catalysing light-driven water oxidation. Variable temperature variable field (VTVH) Magnetic Circular Dichroism (MCD) spectra in PSII of Thermosynochococcus (T.) vulcanus for each S-state are reported. These spectra, along with assignments, provide a new window into the electronic and magnetic structure of Mn4CaO5. VTVH MCD spectra taken in the S2 state provide a clear g=2, S=1/2 paramagnetic characteristic, which is entirely consistent with that known by EPR. The three features, seen as positive (+) at 749nm, negative (-) at 773nm and (+) at 808nm are assigned as 4A→2E spin-flips within the d3 configuration of the Mn(IV) centres present. This assignment is supported by comparison(s) to spin-flips seen in a range of Mn(IV) materials. S3 exhibits a more intense (-) MCD peak at 764nm and has a stronger MCD saturation characteristic. This S3 MCD saturation behaviour can be accurately modelled using parameters taken directly from analyses of EPR spectra. We see no evidence for Mn(III) d-d absorption in the near-IR of any S-state. We suggest that Mn(IV)-based absorption may be responsible for the well-known near-IR induced changes induced in S2 EPR spectra of T. vulcanus and not Mn(III)-based, as has been commonly assumed. Through an analysis of the nephelauxetic effect, the excitation energy of S-state dependent spin-flips seen may help identify coordination characteristics and changes at each Mn(IV). A prospectus as to what more detailed S-state dependent MCD studies promise to achieve is outlined.
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Affiliation(s)
- Jennifer Morton
- Research School of Chemistry, Australian National University, Canberra, Australia
| | - Maria Chrysina
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Vincent S J Craig
- Research School of Chemistry, Australian National University, Canberra, Australia
| | - Fusamichi Akita
- Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Department of Biology, Faculty of Science, Okayama University, Okayama, Japan; Japan Science and Technology Agency, PRESTO, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Yoshiki Nakajima
- Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Department of Biology, Faculty of Science, Okayama University, Okayama, Japan
| | - Wolfgang Lubitz
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Nicholas Cox
- Research School of Chemistry, Australian National University, Canberra, Australia; Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Jian-Ren Shen
- Research Institute for Interdisciplinary Science, Graduate School of Natural Science and Technology, Department of Biology, Faculty of Science, Okayama University, Okayama, Japan
| | - Elmars Krausz
- Research School of Chemistry, Australian National University, Canberra, Australia.
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11
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Energetics of proton release on the first oxidation step in the water-oxidizing enzyme. Nat Commun 2015; 6:8488. [PMID: 26442814 PMCID: PMC4617610 DOI: 10.1038/ncomms9488] [Citation(s) in RCA: 98] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Accepted: 08/26/2015] [Indexed: 12/31/2022] Open
Abstract
In photosystem II (PSII), the Mn4CaO5 cluster catalyses the water splitting reaction. The crystal structure of PSII shows the presence of a hydrogen-bonded water molecule directly linked to O4. Here we show the detailed properties of the H-bonds associated with the Mn4CaO5 cluster using a quantum mechanical/molecular mechanical approach. When O4 is taken as a μ-hydroxo bridge acting as a hydrogen-bond donor to water539 (W539), the S0 redox state best describes the unusually short O4–OW539 distance (2.5 Å) seen in the crystal structure. We find that in S1, O4 easily releases the proton into a chain of eight strongly hydrogen-bonded water molecules. The corresponding hydrogen-bond network is absent for O5 in S1. The present study suggests that the O4-water chain could facilitate the initial deprotonation event in PSII. This unexpected insight is likely to be of real relevance to mechanistic models for water oxidation. The availability of crystal structures of photosystem II opens up the possibility of gaining insights into its mechanism. Here, the authors use a computational approach and propose a deprotonation event at O4 followed by long-range proton-transfer along a chain of strongly bonded water molecules.
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12
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Sooch BS, Kauldhar BS, Puri M. Recent insights into microbial catalases: Isolation, production and purification. Biotechnol Adv 2014; 32:1429-47. [DOI: 10.1016/j.biotechadv.2014.09.003] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2014] [Revised: 09/10/2014] [Accepted: 09/18/2014] [Indexed: 01/08/2023]
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Bikas R, Hosseini-Monfared H, Sanchiz J, Siczek M, Lis T. Synthesis, crystal structure and magnetic properties of a trinuclear phenolate bridged manganese complex containing Mn(ii)–Mn(iii) ions. RSC Adv 2014. [DOI: 10.1039/c4ra05964f] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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14
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Jana A, Aliaga-Alcalde N, Ruiz E, Mohanta S. Structures, Magnetochemistry, Spectroscopy, Theoretical Study, and Catechol Oxidase Activity of Dinuclear and Dimer-of-Dinuclear Mixed-Valence MnIIIMnII Complexes Derived from a Macrocyclic Ligand. Inorg Chem 2013; 52:7732-46. [DOI: 10.1021/ic400916h] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arpita Jana
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700
009, India
| | - Núria Aliaga-Alcalde
- Institució Catalana de Recerca i Estudis Avançats (ICREA), Institut de Ciència de Materials de Barcelona (ICMAB-CSIC)
Campus de la UAB, 08193 Bellaterra, Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica and
Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, E-08028 Barcelona,
Spain
| | - Sasankasekhar Mohanta
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700
009, India
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15
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Cotruvo JA, Stich TA, Britt RD, Stubbe J. Mechanism of assembly of the dimanganese-tyrosyl radical cofactor of class Ib ribonucleotide reductase: enzymatic generation of superoxide is required for tyrosine oxidation via a Mn(III)Mn(IV) intermediate. J Am Chem Soc 2013; 135:4027-39. [PMID: 23402532 DOI: 10.1021/ja312457t] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Ribonucleotide reductases (RNRs) utilize radical chemistry to reduce nucleotides to deoxynucleotides in all organisms. In the class Ia and Ib RNRs, this reaction requires a stable tyrosyl radical (Y(•)) generated by oxidation of a reduced dinuclear metal cluster. The Fe(III)2-Y(•) cofactor in the NrdB subunit of the class Ia RNRs can be generated by self-assembly from Fe(II)2-NrdB, O2, and a reducing equivalent. By contrast, the structurally homologous class Ib enzymes require a Mn(III)2-Y(•) cofactor in their NrdF subunit. Mn(II)2-NrdF does not react with O2, but it binds the reduced form of a conserved flavodoxin-like protein, NrdIhq, which, in the presence of O2, reacts to form the Mn(III)2-Y(•) cofactor. Here we investigate the mechanism of assembly of the Mn(III)2-Y(•) cofactor in Bacillus subtilis NrdF. Cluster assembly from Mn(II)2-NrdF, NrdI(hq), and O2 has been studied by stopped flow absorption and rapid freeze quench EPR spectroscopies. The results support a mechanism in which NrdI(hq) reduces O2 to O2(•-) (40-48 s(-1), 0.6 mM O2), the O2(•-) channels to and reacts with Mn(II)2-NrdF to form a Mn(III)Mn(IV) intermediate (2.2 ± 0.4 s(-1)), and the Mn(III)Mn(IV) species oxidizes tyrosine to Y(•) (0.08-0.15 s(-1)). Controlled production of O2(•-) by NrdIhq during class Ib RNR cofactor assembly both circumvents the unreactivity of the Mn(II)2 cluster with O2 and satisfies the requirement for an "extra" reducing equivalent in Y(•) generation.
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Affiliation(s)
- Joseph A Cotruvo
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
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16
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Abstract
Bacillus pumilus SAFR-032, isolated at spacecraft assembly facilities of the National Aeronautics and Space Administration Jet Propulsion Laboratory, is difficult to kill by the sterilization method of choice, which uses liquid or vapor hydrogen peroxide. We identified two manganese catalases, YjqC and BPUM_1305, in spore protein extracts of several B. pumilus strains by using PAGE and mass spectrometric analyses. While the BPUM_1305 catalase was present in six of the B. pumilus strains tested, YjqC was not detected in ATCC 7061 and BG-B79. Furthermore, both catalases were localized in the spore coat layer along with laccase and superoxide dismutase. Although the initial catalase activity in ATCC 7061 spores was higher, it was less stable over time than the SAFR-032 enzyme. We propose that synergistic activity of YjqC and BPUM_1305, along with other coat oxidoreductases, contributes to the enhanced resistance of B. pumilus spores to hydrogen peroxide. We observed that the product of the catalase reaction, gaseous oxygen, forms expanding vesicles on the spore surface, affecting the mechanical integrity of the coat layer, resulting in aggregation of the spores. The accumulation of oxygen gas and aggregations may play a crucial role in limiting further exposure of Bacilli spore surfaces to hydrogen peroxide or other toxic chemicals when water is present.
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18
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Corbella M, Fernández G, González P, Maestro M, Font‐Bardia M, Stoeckli‐Evans H. Dinuclear Mn
III
Compounds [{Mn(bpy)(H
2
O)}
2
(μ‐4‐RC
6
H
4
COO)
2
(μ‐O)](NO
3
)
2
(R = Me, F, CF
3
, MeO,
t
Bu): Effect of the R Group on the Magnetic Properties and the Catalase Activity. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101433] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Montserrat Corbella
- Departament de Química Inorgànica and Institut de Nanociènciai Nanotecnologia (INIUB), Universitat de Barcelona, Martí i Franquès 1–11, 08028 Barcelona, Spain, Fax: +34‐934907725
| | - Gema Fernández
- Departament de Química Inorgànica and Institut de Nanociènciai Nanotecnologia (INIUB), Universitat de Barcelona, Martí i Franquès 1–11, 08028 Barcelona, Spain, Fax: +34‐934907725
| | - Patricia González
- Departament de Química Inorgànica and Institut de Nanociènciai Nanotecnologia (INIUB), Universitat de Barcelona, Martí i Franquès 1–11, 08028 Barcelona, Spain, Fax: +34‐934907725
| | - Miguel Maestro
- Departamento de Química Fundamental and Servicios Xerais de Apoio a Investigación, Universidade da Coruña, 15071 A Coruña, Spain
| | - Mercè Font‐Bardia
- Departamento de Cristallografia, Mineralogia i DipòsitsMinerals, Universitat de Barcelona, Martí i Franquès s/n, and Unitat de Difracció de RX, Serveis Científico‐Tècnics, Universitat de Barcelona, Solé i Sabarís 1–3, 08028 Barcelona, Spain
| | - Helen Stoeckli‐Evans
- Institut de Chimie, Université de Neuchâtel, Av. Bellevaux 51, 2007 Neuchâtel, Switzerland
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McConnell IL, Grigoryants VM, Scholes CP, Myers WK, Chen PY, Whittaker JW, Brudvig GW. EPR-ENDOR characterization of (17O, 1H, 2H) water in manganese catalase and its relevance to the oxygen-evolving complex of photosystem II. J Am Chem Soc 2012; 134:1504-12. [PMID: 22142421 DOI: 10.1021/ja203465y] [Citation(s) in RCA: 76] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of efficient water-oxidation catalysts demands insight into the only known, naturally occurring water-oxidation catalyst, the oxygen-evolving complex (OEC) of photosystem II (PSII). Understanding the water oxidation mechanism requires knowledge of where and when substrate water binds to the OEC. Mn catalase in its Mn(III)-Mn(IV) state is a protein model of the OEC's S(2) state. From (17)O-labeled water exchanged into the di-μ-oxo di-Mn(III,IV) coordination sphere of Mn catalase, CW Q-band ENDOR spectroscopy revealed two distinctly different (17)O signals incorporated in distinctly different time regimes. First, a signal appearing after 2 h of (17)O exchange was detected with a 13.0 MHz hyperfine coupling. From similarity in the time scale of isotope incorporation and in the (17)O μ-oxo hyperfine coupling of the di-μ-oxo di-Mn(III,IV) bipyridine model (Usov, O. M.; Grigoryants, V. M.; Tagore, R.; Brudvig, G. W.; Scholes, C. P. J. Am. Chem. Soc. 2007, 129, 11886-11887), this signal was assigned to μ-oxo oxygen. EPR line broadening was obvious from this (17)O μ-oxo species. Earlier exchange proceeded on the minute or faster time scale into a non-μ-oxo position, from which (17)O ENDOR showed a smaller 3.8 MHz hyperfine coupling and possible quadrupole splittings, indicating a terminal water of Mn(III). Exchangeable proton/deuteron hyperfine couplings, consistent with terminal water ligation to Mn(III), also appeared. Q-band CW ENDOR from the S(2) state of the OEC was obtained following multihour (17)O exchange, which showed a (17)O hyperfine signal with a 11 MHz hyperfine coupling, tentatively assigned as μ-oxo-(17)O by resemblance to the μ-oxo signals from Mn catalase and the di-μ-oxo di-Mn(III,IV) bipyridine model.
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Affiliation(s)
- Iain L McConnell
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, USA
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Whittaker JW. Non-heme manganese catalase--the 'other' catalase. Arch Biochem Biophys 2011; 525:111-20. [PMID: 22198285 DOI: 10.1016/j.abb.2011.12.008] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2011] [Revised: 12/09/2011] [Accepted: 12/10/2011] [Indexed: 12/24/2022]
Abstract
Non-heme manganese catalases are widely distributed over microbial life and represent an environmentally important alternative to heme-containing catalases in antioxidant defense. Manganese catalases contain a binuclear manganese complex as their catalytic active site rather than a heme, and cycle between Mn(2)(II,II) and Mn(2)(III,III) states during turnover. X-ray crystallography has revealed the key structural elements of the binuclear manganese active site complex that can serve as the starting point for computational studies on the protein. Four manganese catalase enzymes have been isolated and characterized, and the enzyme appears to have a broad phylogenetic distribution including both bacteria and archae. More than 100 manganese catalase genes have been annotated in genomic databases, although the assignment of many of these putative manganese catalases needs to be experimentally verified. Iron limitation, exposure to low levels of peroxide stress, thermostability and cyanide resistance may provide the biological and environmental context for the occurrence of manganese catalases.
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Affiliation(s)
- James W Whittaker
- Institute for Environmental Health, Division of Environmental and Biomolecular Systems, Oregon Health and Science University, 20000 N.W. Walker Road, Beaverton, OR 97006-8921, USA.
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21
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Schoenfeldt NJ, Notestein JM. Solid Cocatalysts for Activating Manganese Triazacyclononane Oxidation Catalysts. ACS Catal 2011. [DOI: 10.1021/cs200353x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Nicholas J. Schoenfeldt
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Technological Institute, Room E136, Evanston, Illinois 60208, United States
| | - Justin M. Notestein
- Department of Chemical and Biological Engineering, Northwestern University, 2145 Sheridan Road, Technological Institute, Room E136, Evanston, Illinois 60208, United States
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Corbella M, Gómez V, Garcia B, Rodriguez E, Albela B, Maestro MA. Synthesis, crystal structure and magnetic properties of new dinuclear Mn(III) compounds with 4-ClC6H4COO and 4-BrC6H4COO bridges. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.07.016] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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Cotruvo JA, Stubbe J. Escherichia coli class Ib ribonucleotide reductase contains a dimanganese(III)-tyrosyl radical cofactor in vivo. Biochemistry 2011; 50:1672-81. [PMID: 21250660 DOI: 10.1021/bi101881d] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Escherichia coli class Ib ribonucleotide reductase (RNR) converts nucleoside 5'-diphosphates to deoxynucleoside 5'-diphosphates in iron-limited and oxidative stress conditions. We have recently demonstrated in vitro that this RNR is active with both diferric-tyrosyl radical (Fe(III)(2)-Y(•)) and dimanganese(III)-Y(•) (Mn(III)(2)-Y(•)) cofactors in the β2 subunit, NrdF [Cotruvo, J. A., Jr., and Stubbe, J. (2010) Biochemistry 49, 1297-1309]. Here we demonstrate, by purification of this protein from its endogenous levels in an E. coli strain deficient in its five known iron uptake pathways and grown under iron-limited conditions, that the Mn(III)(2)-Y(•) cofactor is assembled in vivo. This is the first definitive determination of the active cofactor of a class Ib RNR purified from its native organism without overexpression. From 88 g of cell paste, 150 μg of NrdF was isolated with ∼95% purity, with 0.2 Y(•)/β2, 0.9 Mn/β2, and a specific activity of 720 nmol min(-1) mg(-1). Under these conditions, the class Ib RNR is the primary active RNR in the cell. Our results strongly suggest that E. coli NrdF is an obligate manganese protein in vivo and that the Mn(III)(2)-Y(•) cofactor assembly pathway we have identified in vitro involving the flavodoxin-like protein NrdI, present inside the cell at catalytic levels, is operative in vivo.
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Affiliation(s)
- Joseph A Cotruvo
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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24
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Najafpour MM, Govindjee. Oxygen evolving complex in Photosystem II: Better than excellent. Dalton Trans 2011; 40:9076-84. [DOI: 10.1039/c1dt10746a] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Lieb D, Zahl A, Shubina TE, Ivanović-Burmazović I. Water exchange on manganese(III) porphyrins. Mechanistic insights relevant for oxygen evolving complex and superoxide dismutation catalysis. J Am Chem Soc 2010; 132:7282-4. [PMID: 20462177 DOI: 10.1021/ja1014585] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work the rate constants (k(ex)) and the activation parameters (DeltaH(double dagger), DeltaS(double dagger), and DeltaV(double dagger)) for the water exchange process on Mn(III) centers have experimentally been determined using temperature and pressure dependent (17)O NMR techniques. For the investigations the Mn(III) porphyrin complexes [Mn(III)(TPPS)S(2)](n-) and [Mn(III)(TMpyP)S(2)](n+) (S = H(2)O and/or OH(-)) have been selected due to their high solution stability in a wide pH range, enabling the measurements of water exchange in the case of both diaqua and aqua-hydroxo complexes. We have experimentally demonstrated that the water exchange on Mn(III) porphyrins is a fast process (k(ex) approximately = 10(7) s(-1)) of an I(d) to I mechanism, strongly influenced by a Jahn-Teller effect and as such almost independent of a porphyrin charge and a trans ligand. This is also supported by our DFT calculations which show only a slight difference in an average Mn(III)-OH(2) bond found for a positively charged model porphyrin with protonated pyridine groups (2.446 A) and for a simple model without any substituents on the porphyrin ring (2.437 A). The calculated effective charge on the Mn center, which is significantly lower than its formal +3 charge (ca. +1.5 for diaqua; +1.4 for aqua-hydroxo), also contributes to its substitution lability. The herein presented results are discussed in connection to a possible fast exchanging substrate binding site in photosystem II and corresponding inorganic model complexes, as well as in the context of a possible inner-sphere catalytic pathway for superoxide dismutation on Mn centers.
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Affiliation(s)
- Dominik Lieb
- Friedrich-Alexander-Universität Erlangen-Nürnberg, Department Chemie und Pharmazie, Egerlandstr. 1, 91058 Erlangen, Germany
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26
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Gangopadhyay S, Masunov AE, Poalelungi E, Leuenberger MN. Weak antiferromagnetic coupling in molecular ring is predicted correctly by density functional theory plus Hubbard U. J Chem Phys 2010; 132:244104. [DOI: 10.1063/1.3421645] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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27
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van Slageren J, Piligkos S, Neese F. Magnetic circular dichroism spectroscopy on the Cr₈ antiferromagnetic ring. Dalton Trans 2010; 39:4999-5004. [PMID: 21491661 DOI: 10.1039/b925028j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A Magnetic Circular Dichroism (MCD) spectroscopic study of the antiferromagnetic ring [Cr₈F₈Piv₁₆] (Piv = pivalate) is reported. From the splitting of the MCD bands, the single ion anisotropy parameters in the cluster spin ground state at different fields were determined to be d(Cr) = -0.33 ± 0.02 cm⁻¹, e(Cr) = 0.11 ± 0.01 cm⁻¹. Analysis of the MCD intensity as a function of field and temperature revealed the influence of spin mixing effects and yielded independent estimates of the single ion anisotropies (d(Cr) = -0.19 cm⁻¹, e(Cr) = 4.3 × 10-4 cm⁻¹), as well as yielding the isotropic exchange interaction strength (J = -6.00 cm⁻¹). Thus it is shown that MCD is a powerful method to unravel the relation between single-ion and cluster anisotropy, furthering the design of molecular magnets with desired properties.
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Cotruvo JA, Stubbe J. An active dimanganese(III)-tyrosyl radical cofactor in Escherichia coli class Ib ribonucleotide reductase. Biochemistry 2010; 49:1297-309. [PMID: 20070127 DOI: 10.1021/bi902106n] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Escherichia coli class Ib ribonucleotide reductase (RNR) converts nucleoside 5'-diphosphates to deoxynucleoside 5'-diphosphates and is expressed under iron-limited and oxidative stress conditions. This RNR is composed of two homodimeric subunits: alpha2 (NrdE), where nucleotide reduction occurs, and beta2 (NrdF), which contains an unidentified metallocofactor that initiates nucleotide reduction. nrdE and nrdF are found in an operon with nrdI, which encodes an unusual flavodoxin proposed to be involved in metallocofactor biosynthesis and/or maintenance. Ni affinity chromatography of a mixture of E. coli (His)(6)-NrdI and NrdF demonstrated tight association between these proteins. To explore the function of NrdI and identify the metallocofactor, apoNrdF was loaded with Mn(II) and incubated with fully reduced NrdI (NrdI(hq)) and O(2). Active RNR was rapidly produced with 0.25 +/- 0.03 tyrosyl radical (Y*) per beta2 and a specific activity of 600 units/mg. EPR and biochemical studies of the reconstituted cofactor suggest it is Mn(III)(2)-Y*, which we propose is generated by Mn(II)(2)-NrdF reacting with two equivalents of HO(2)(-), produced by reduction of O(2) by NrdF-bound NrdI(hq). In the absence of NrdI(hq), with a variety of oxidants, no active RNR was generated. By contrast, a similar experiment with apoNrdF loaded with Fe(II) and incubated with O(2) in the presence or absence of NrdI(hq) gave 0.2 and 0.7 Y*/beta2 with specific activities of 80 and 300 units/mg, respectively. Thus NrdI(hq) hinders Fe(III)(2)-Y* cofactor assembly in vitro. We propose that NrdI is an essential player in E. coli class Ib RNR cluster assembly and that the Mn(III)(2)-Y* cofactor, not the diferric-Y* one, is the active metallocofactor in vivo.
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Affiliation(s)
- Joseph A Cotruvo
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
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29
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Madhu V, Ekambaram B, Shimon LJW, Diskin Y, Leitus G, Neumann R. Structural diversity in manganese, iron and cobalt complexes of the ditopic 1,2-bis(2,2′-bipyridyl-6-yl)ethyne ligand and observation of epoxidation and catalase activity of manganese compounds. Dalton Trans 2010; 39:7266-75. [DOI: 10.1039/b925129d] [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]
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31
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Smith SJ, Riley MJ, Noble CJ, Hanson GR, Stranger R, Jayaratne V, Cavigliasso G, Schenk G, Gahan LR. Structural and Catalytic Characterization of a Heterovalent Mn(II)Mn(III) Complex That Mimics Purple Acid Phosphatases. Inorg Chem 2009; 48:10036-48. [DOI: 10.1021/ic9005086] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Christopher J. Noble
- Centre for Magnetic Resonance, The University of Queensland, Brisbane 4072, Australia
| | - Graeme R. Hanson
- Centre for Magnetic Resonance, The University of Queensland, Brisbane 4072, Australia
| | - Robert Stranger
- Research School of Chemistry, Australian National University, Canberra 0200, Australia
| | - Vidura Jayaratne
- Research School of Chemistry, Australian National University, Canberra 0200, Australia
| | - Germán Cavigliasso
- Research School of Chemistry, Australian National University, Canberra 0200, Australia
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32
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Lessa JA, Horn A, Bull ÉS, Rocha MR, Benassi M, Catharino RR, Eberlin MN, Casellato A, Noble CJ, Hanson GR, Schenk G, Silva GC, Antunes OAC, Fernandes C. Catalase vs Peroxidase Activity of a Manganese(II) Compound: Identification of a Mn(III)−(μ-O)2−Mn(IV) Reaction Intermediate by Electrospray Ionization Mass Spectrometry and Electron Paramagnetic Resonance Spectroscopy. Inorg Chem 2009; 48:4569-79. [DOI: 10.1021/ic801969c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Josane A. Lessa
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Adolfo Horn
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Érika S. Bull
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Michelle R. Rocha
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Mario Benassi
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Rodrigo R. Catharino
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Marcos N. Eberlin
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Annelise Casellato
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Christoper J. Noble
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Graeme R. Hanson
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Gerhard Schenk
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Giselle C. Silva
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - O. A. C. Antunes
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
| | - Christiane Fernandes
- Laboratório de Ciências Químicas, Universidade Estadual do Norte Fluminense, 28013-602, Campos dos Goytacazes, RJ, Brazil, Laboratório ThoMSon de Espectrometria de Massas, Instituto de Química, Universidade Estadual de Campinas, 13084-971, Campinas, SP, Brazil, School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, QLD 4072, Australia, Centre for Magnetic Resonance, The University of Queensland, St. Lucia, QLD 4072, Australia, and Instituto de Química, Universidade
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Najafpour MM. A possible evolutionary origin for the Mn4 cluster in photosystem II: from manganese superoxide dismutase to oxygen evolving complex. ORIGINS LIFE EVOL B 2009; 39:151-63. [PMID: 19148771 DOI: 10.1007/s11084-009-9159-4] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2008] [Accepted: 12/18/2008] [Indexed: 12/31/2022]
Abstract
The recently published X-ray absorption fine structure of photosystem II provides a more detailed architecture of the oxygen-evolving complex (OEC) and the surrounding amino acids. In this paper, a comparison between manganese superoxide dismutase, dinuclear manganese catalase enzymes and the oxygen evolving complex in photosystem II is reported. The author suggests that the development of oxygenic photosynthesis occurred in steps, the first of which involved only one manganese ion (Mn(II)) that oxidized two water molecules to hydrogen peroxide and then oxygen.
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Affiliation(s)
- M Mahdi Najafpour
- Dorna Institute of Science, No 83 Padadshahr, 14St. Ahwaz, Khozestan, Iran.
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Abstract
Excessive hydrogen peroxide is harmful for almost all cell components, so its rapid and efficient removal is of essential importance for aerobically living organisms. Conversely, hydrogen peroxide acts as a second messenger in signal-transduction pathways. H(2)O(2) is degraded by peroxidases and catalases, the latter being able both to reduce H(2)O(2) to water and to oxidize it to molecular oxygen. Nature has evolved three protein families that are able to catalyze this dismutation at reasonable rates. Two of the protein families are heme enzymes: typical catalases and catalase-peroxidases. Typical catalases comprise the most abundant group found in Eubacteria, Archaeabacteria, Protista, Fungi, Plantae, and Animalia, whereas catalase-peroxidases are not found in plants and animals and exhibit both catalatic and peroxidatic activities. The third group is a minor bacterial protein family with a dimanganese active site called manganese catalases. Although catalyzing the same reaction (2 H(2)O(2)--> 2 H(2)O+ O(2)), the three groups differ significantly in their overall and active-site architecture and the mechanism of reaction. Here, we present an overview of the distribution, phylogeny, structure, and function of these enzymes. Additionally, we report about their physiologic role, response to oxidative stress, and about diseases related to catalase deficiency in humans.
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Affiliation(s)
- Marcel Zamocky
- Department of Chemistry, Division of Biochemistry, BOKU-University of Natural Resources and Applied Life Sciences, Vienna, Austria.
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Andreini C, Bertini I, Cavallaro G, Holliday GL, Thornton JM. Metal ions in biological catalysis: from enzyme databases to general principles. J Biol Inorg Chem 2008; 13:1205-18. [PMID: 18604568 DOI: 10.1007/s00775-008-0404-5] [Citation(s) in RCA: 734] [Impact Index Per Article: 45.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2008] [Accepted: 06/25/2008] [Indexed: 12/01/2022]
Abstract
We analysed the roles and distribution of metal ions in enzymatic catalysis using available public databases and our new resource Metal-MACiE (http://www.ebi.ac.uk/thornton-srv/databases/Metal_MACiE/home.html). In Metal-MACiE, a database of metal-based reaction mechanisms, 116 entries covering 21% of the metal-dependent enzymes and 70% of the types of enzyme-catalysed chemical transformations are annotated according to metal function. We used Metal-MACiE to assess the functions performed by metals in biological catalysis and the relative frequencies of different metals in different roles, which can be related to their individual chemical properties and availability in the environment. The overall picture emerging from the overview of Metal-MACiE is that redox-inert metal ions are used in enzymes to stabilize negative charges and to activate substrates by virtue of their Lewis acid properties, whereas redox-active metal ions can be used both as Lewis acids and as redox centres. Magnesium and zinc are by far the most common ions of the first type, while calcium is relatively less used. Magnesium, however, is most often bound to phosphate groups of substrates and interacts with the enzyme only transiently, whereas the other metals are stably bound to the enzyme. The most common metal of the second type is iron, which is prevalent in the catalysis of redox reactions, followed by manganese, cobalt, molybdenum, copper and nickel. The control of the reactivity of redox-active metal ions may involve their association with organic cofactors to form stable units. This occurs sometimes for iron and nickel, and quite often for cobalt and molybdenum.
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Affiliation(s)
- Claudia Andreini
- Magnetic Resonance Center (CERM), University of Florence, Via L. Sacconi 6, 50019, Sesto Fiorentino, Italy
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Yeagle GJ, Gilchrist ML, McCarrick RM, Britt RD. Multifrequency pulsed electron paramagnetic resonance study of the S2 state of the photosystem II manganese cluster. Inorg Chem 2008; 47:1803-14. [PMID: 18330971 DOI: 10.1021/ic701680c] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Multifrequency electron spin-echo envelope modulation (ESEEM) spectroscopy is employed to measure the strength of the hyperfine coupling of magnetic nuclei to the paramagnetic (S = 1/2) S2 form of photosystem II (PSII). Previous X-band-frequency ESEEM studies indicated that one or more histidine nitrogens are electronically coupled to the tetranuclear manganese cluster in the S2 state of PSII. However, the spectral resolution was relatively poor at the approximately 9 GHz excitation frequency, precluding any in-depth analysis of the corresponding bonding interaction between the detected histidine and the manganese cluster. Here we report ESEEM experiments using higher X-, P-, and Ka-band microwave frequencies to target PSII membranes isolated from spinach. The X- to P-band ESEEM spectra suffer from the same poor resolution as that observed in previous experiments, while the Ka-band spectra show remarkably well-resolved features that allow for the direct determination of the nuclear quadrupolar couplings for a single I = 1(14)N nucleus. The Ka-band results demonstrate that at an applied field of 1.1 T we are much closer to the exact cancellation limit (alpha iso = 2nu(14)N) that optimizes ESEEM spectra. These results reveal hyperfine (alpha iso = 7.3 +/- 0.20 MHz and alpha dip = 0.50 +/- 0.10 MHz) and nuclear quadrupolar (e(2)qQ = 1.98 +/- 0.05 MHz and eta = 0.84 +/- 0.06) couplings for a single (14)N nucleus magnetically coupled to the manganese cluster in the S 2 state of PSII. These values are compared to the histidine imidazole nitrogen hyperfine and nuclear quadrupolar couplings found in superoxidized manganese catalase as well as (14)N couplings in relevant manganese model complexes.
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Affiliation(s)
- Gregory J Yeagle
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, USA
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Unusual properties of catalase A (KatA) of Pseudomonas aeruginosa PA14 are associated with its biofilm peroxide resistance. J Bacteriol 2007; 190:2663-70. [PMID: 18165301 DOI: 10.1128/jb.01580-07] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Pseudomonas aeruginosa is a ubiquitous environmental bacterium whose major catalase (KatA) is highly stable, extracellularly present, and required for full virulence as well as for peroxide resistance in planktonic and biofilm states. Here, we dismantled the function of P. aeruginosa KatA (KatA(Pa)) by comparing its properties with those of two evolutionarily related (clade 3 monofunctional) catalases from Bacillus subtilis (KatA(Bs)) and Streptomyces coelicolor (CatA(Sc)). We switched the coding region for KatA(Pa) with those for KatA(Bs) and CatA(Sc), expressed the catalases under the potential katA-regulatory elements in a P. aeruginosa PA14 katA mutant, and verified their comparable protein levels by Western blot analysis. The activities of KatA(Bs) and CatA(Sc), however, were less than 40% of the KatA(Pa) activity, suggestive of the difference in intrinsic catalatic activity or efficiency for posttranslational activity modulation in P. aeruginosa. Furthermore, KatA(Bs) and CatA(Sc) were relatively susceptible to proteinase K, whereas KatA(Pa) was highly stable upon proteinase K treatment. As well, KatA(Bs) and CatA(Sc) were undetectable in the extracellular milieu. Nevertheless, katA(Bs) and catA(Sc) fully rescued the peroxide sensitivity and osmosensitivity of the katA mutant, respectively. Both catalase genes rescued the attenuated virulence of the katA mutant in mouse acute infection and Drosophila melanogaster models. However, the peroxide susceptibility of the katA mutant in a biofilm growth state was rescued by neither katA(Bs) nor catA(Sc). Based on these results, we propose that the P. aeruginosa KatA is highly stable compared to the two major catalases from gram-positive bacteria and that its unique properties involving metastability and extracellular presence may contribute to the peroxide resistance of P. aeruginosa biofilm and presumably to chronic infections.
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Shin BK, Kim Y, Kim M, Han J. Synthesis, structure and catalase activity of the [TPA2Mn2(μ-Cl)2]2+ complex. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.06.011] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Singh UP, Tyagi P, Upreti S. Manganese complexes as models for manganese-containing pseudocatalase enzymes: Synthesis, structural and catalytic activity studies. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.03.049] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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de Boer JW, Browne WR, Brinksma J, Alsters PL, Hage R, Feringa BL. Mechanism of Cis-Dihydroxylation and Epoxidation of Alkenes by Highly H2O2 Efficient Dinuclear Manganese Catalysts. Inorg Chem 2007; 46:6353-72. [PMID: 17608415 DOI: 10.1021/ic7003613] [Citation(s) in RCA: 82] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the presence of carboxylic acids the complex [Mn(IV)2(micro-O)3(tmtacn)2]2+ (1, where tmtacn = N,N',N''-trimethyl-1,4,7-triazacyclononane) is shown to be highly efficient in catalyzing the oxidation of alkenes to the corresponding cis-diol and epoxide with H2O2 as terminal oxidant. The selectivity of the catalytic system with respect to (w.r.t.) either cis-dihydroxylation or epoxidation of alkenes is shown to be dependent on the carboxylic acid employed. High turnover numbers (t.o.n. > 2000) can be achieved especially w.r.t. cis-dihydroxylation for which the use of 2,6-dichlorobenzoic acid allows for the highest t.o.n. reported thus far for cis-dihydroxylation of alkenes catalyzed by a first-row transition metal and high efficiency w.r.t. the terminal oxidant (H2O2). The high activity and selectivity is due to the in situ formation of bis(micro-carboxylato)-bridged dinuclear manganese(III) complexes. Tuning of the activity of the catalyst by variation in the carboxylate ligands is dependent on both the electron-withdrawing nature of the ligand and on steric effects. By contrast, the cis-diol/epoxide selectivity is dominated by steric factors. The role of solvent, catalyst oxidation state, H2O, and carboxylic acid concentration and the nature of the carboxylic acid employed on both the activity and the selectivity of the catalysis are explored together with speciation analysis and isotope labeling studies. The results confirm that the complexes of the type [Mn2(micro-O)(micro-R-CO2)2(tmtacn)2]2+, which show remarkable redox and solvent-dependent coordination chemistry, are the resting state of the catalytic system and that they retain a dinuclear structure throughout the catalytic cycle. The mechanistic understanding obtained from these studies holds considerable implications for both homogeneous manganese oxidation catalysis and in understanding related biological systems such as dinuclear catalase and arginase enzymes.
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Affiliation(s)
- Johannes W de Boer
- Stratingh Institute for Chemistry, University of Groningen, Nijenborgh 4, Groningen, The Netherlands
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41
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Spiegel K, De Grado WF, Klein ML. Structural and dynamical properties of manganese catalase and the synthetic protein DF1 and their implication for reactivity from classical molecular dynamics calculations. Proteins 2006; 65:317-30. [PMID: 16917908 DOI: 10.1002/prot.21113] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
There is a pressing need for accurate force fields to assist in metalloprotein analysis and design. Recent work on the design of mimics of dimetal proteins highlights the requirements for activity. DF1 is a de novo designed protein, which mimics the overall fold and active site geometry of a series of diiron and dimanganese proteins. Specifically, the dimanganese form of DF1 is a mimic of the natural enzyme manganese catalase, which catalyzes the dismutation reaction of hydrogen peroxide into water and oxygen. During catalytic turnover, the active site has to accommodate both the reduced and the oxidized state of the dimanganese core. The biomimetic protein DF1 is only stable in the reduced form and thus not active. Furthermore, the synthetic protein features an additional bridging glutamate sidechain, which occupies the substrate binding site. The goal of this study is to develop classical force fields appropriate for design of such important dimanganese proteins. To this aim, we use a nonbonded model to represent the metal-ligand interactions, which implicitly takes into account charge transfer and local polarization effects between the metal and its ligands. To calibrate this approach, we compare and contrast geometric and dynamical properties of manganese catalase and DF1. Having demonstrated a good correspondence with experimental structural data, we examine the effect of mutating the bridging glutamate to aspartate (M1) and serine (M2). Classical MD based on the refined forcefield shows that these point mutations affect not only the immediate coordination sphere of the manganese ions, but also the relative position of the helices, improving the similarity to Mn-catalase, especially in case of M2. On the basis of these findings, classical molecular dynamics calculations with the active site parameterization scheme introduced herein seem to be a promising addition to the protein design toolbox.
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Affiliation(s)
- Katrin Spiegel
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, Philadelphia, Pennsylvania 19104-6323, USA.
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Dal Peraro M, Spiegel K, Lamoureux G, De Vivo M, DeGrado WF, Klein ML. Modeling the charge distribution at metal sites in proteins for molecular dynamics simulations. J Struct Biol 2006; 157:444-53. [PMID: 17188512 DOI: 10.1016/j.jsb.2006.10.019] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2006] [Revised: 10/19/2006] [Accepted: 10/19/2006] [Indexed: 10/24/2022]
Abstract
Almost half of the proteome of living organisms is constituted of metalloproteins. Unfortunately, the ability of the current generation of molecular dynamics pairwise-additive forcefields to properly describe metal pockets is severely lacking due to the intrinsic difficulty of handling polarization and charge transfer contributions. In order to improve the description of metalloproteins, a simple reparameterization strategy is proposed herein that does not involve artificial constraints. Specifically, a non-bonded quantum mechanical-based model is used to capture the mean polarization and charge transfer contributions to the interatomic forces within the metal site. The present approach is demonstrated to provide enough accuracy to maintain the integrity of the metal pocket for a variety of metalloproteins during extended (multi-nanosecond) molecular dynamics simulations. The method enables the sampling of small conformational changes and the relaxation of local frustrations in NMR structures.
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Affiliation(s)
- M Dal Peraro
- Center for Molecular Modeling and Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104-6323, USA.
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Gultneh Y, Tesema YT, Yisgedu TB, Butcher RJ, Wang G, Yee GT. Studies of a Dinuclear Manganese Complex with Phenoxo and Bis-acetato Bridging in the Mn2(II,II) and Mn2(II,III) States: Coordination Structural Shifts and Oxidation State Control in Bridged Dinuclear Complexes. Inorg Chem 2006; 45:3023-33. [PMID: 16562958 DOI: 10.1021/ic060039q] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The dinucleating ligand, 2,6-bis{[(2-(2-pyridyl)ethyl)(2-pyridylmethyl)-amino]-methyl}-4-methylphenol) (L1OH) reacts with Mn(ClO4)2.6H2O to form the dinuclear complex [Mn2(II,II)(L1O)(mu-OOCCH3)2]ClO4 (1). The electrolytic oxidation of 1 at 0.7 V (vs Ag/AgCl) produces the mixed valent complex [Mn2(II,III)(L1O)(mu-OOCCH3)2](ClO4)2 (1ox) quantitatively, while electrolysis at 0.20 V converts 1ox back to 1. X-ray crystallographic structures show that both 1 and 1ox are dinuclear complexes in which the two manganese ions are each in distorted octahedral coordination environments bridged by the phenoxo oxygen and two acetate ions. The structural changes that occur upon the oxidation 1 to 1ox suggest an extended pi-bonding system involving the phenoxo ring C-O(phenoxo)-Mn(II)-N(pyridyl) chain. In addition, as 1 is oxidized to 1ox, the rearrangements in the coordination sphere resulting from the oxidation of one Mn(II) ion to Mn(III) are transmitted via the bridging Mn-O(phenoxo) bonds and cause structural changes that render the site of the second manganese ion unfit for the +3 state and hence unstable to reduction. Thus the electrolytic oxidation of 1ox in acetonitrile at 1.20 V takes up slightly greater than 1 F of charge/mol of 1ox, but the starting complex, 1ox, is recovered, showing the instability of the Mn2(III,III) state that is formed with respect to reduction to 1ox. Variable-temperature magnetic susceptibility measurements of 1 and 1ox over the temperature range from 1.8 to 300 K can be modeled with magnetic coupling constants J = -4.3 and -4.1 cm(-1), respectively showing the weak antiferromagnetic coupling between the two manganese ions in each dinuclear complex, which is commonly observed among similar phenoxo- and bis-1,3-carboxylato-bridged dinuclear Mn2(II,II) and Mn2(II,III) complexes.
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Affiliation(s)
- Yilma Gultneh
- Department of Chemistry, Howard University, Washington, DC 20059, USA.
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46
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Teutloff C, Schäfer KO, Sinnecker S, Barynin V, Bittl R, Wieghardt K, Lendzian F, Lubitz W. High-field EPR investigations of Mn(III)Mn(IV) and Mn(II)Mn(III) states of dimanganese catalase and related model systems. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2005; 43 Spec no.:S51-64. [PMID: 16235205 DOI: 10.1002/mrc.1685] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Multi-frequency EPR experiments at 9, 34 and 94 GHz are reported on the antiferromagnetically coupled mixed valence Mn(II)Mn(III) complex of manganese catalase and on several dinuclear manganese model systems. They are compared with similar experiments obtained earlier for the Mn(III)Mn(IV) states. It is demonstrated how accurate information on the G- and 55Mn hyperfine tensors can be derived from this approach. Furthermore, the effect of oxidation state, planarity of the manganese-oxygen core and the type of ligands bridging the manganese ions on the magnetic resonance parameters and the related electronic structure is investigated. 'Broken-symmetry' density functional calculations on two Mn(III)Mn(IV) complexes, including the superoxidized state of the catalase, are presented. The agreement between calculated and experimental EPR parameters and complex geometries is remarkably good. Implications of these results for the structure and function of the dimanganese catalase are discussed.
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Affiliation(s)
- Christian Teutloff
- Max-Volmer-Laboratory, Institute for Chemistry, PC 14, Technical University Berlin, D-10623 Berlin, Germany
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47
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Sinnecker S, Neese F, Lubitz W. Dimanganese catalase--spectroscopic parameters from broken-symmetry density functional theory of the superoxidized Mn(III)/Mn(IV) state. J Biol Inorg Chem 2005; 10:231-8. [PMID: 15830216 DOI: 10.1007/s00775-005-0633-9] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2004] [Accepted: 02/15/2005] [Indexed: 11/24/2022]
Abstract
Broken-symmetry density functional theory was used to study the catalytic center of manganese catalase in the superoxidized Mn(III)/Mn(IV) state. Heisenberg exchange coupling constants, 55Mn and 14N hyperfine coupling constants (hfcs) and nuclear quadrupole splittings, as well as the electronic g tensors were evaluated for different model systems of the active site after complete geometry optimizations in the high-spin and broken-symmetry states. A comparison of the experimental data with the spectroscopic parameters computed for the models with unprotonated and protonated mu-oxo bridges shows best agreement between theory and experiment for a Mn2(mu-O)2(mu-OAc) core. The calculated Mn-Mn distances and 55Mn hfcs clearly support a dimanganese cluster with unprotonated mu-oxo bridges in the superoxidized state. Furthermore, it is shown that an interchange of the Mn(III) and Mn(IV) oxidation states in this trapped valence system leads to specific changes in the molecular and electronic structure of the manganese clusters.
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Affiliation(s)
- Sebastian Sinnecker
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstrasse 34-36, Mülheim an der Ruhr, 45470, Germany
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Godbole M, Kloskowski M, Hage R, Rompel A, Mills A, Spek A, Bouwman E. Highly Efficient Disproportionation of Dihydrogen Peroxide: Synthesis, Structure, and Catalase Activity of Manganese Complexes of the Salicylimidate Ligand. Eur J Inorg Chem 2005. [DOI: 10.1002/ejic.200400621] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Fernández G, Corbella M, Alfonso M, Stoeckli-Evans H, Castro I. A Comparative XAS and X-ray Diffraction Study of New Binuclear Mn(III) Complexes with Catalase Activity. Indirect Effect of the Counteranion on Magnetic Properties. Inorg Chem 2004; 43:6684-98. [PMID: 15476368 DOI: 10.1021/ic0348897] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Four new binuclear Mn(III) complexes with carboxylate bridges have been synthesized: [[Mn(nn)(H(2)O)](2)(mu-ClCH(2)COO)(2)(mu-O)](ClO(4))(2) with nn = bpy (1) or phen (2) and [[Mn(bpy)(H(2)O)](2)(mu-RCOO)(2)(mu-O)](NO(3))(2) with RCOO = ClCH(2)COO (3) or CH(3)COO (4). The characterization by X-ray diffraction (1 and 3) and X-ray absorption spectroscopy (XAS) (1-4) displays the relevance of this spectroscopy to the elucidation of the structural environment of the manganese ions in this kind of compound. Magnetic susceptibility data show an antiferromagnetic coupling for all the compounds: J = -2.89 cm(-1) (for 1), -8.16 cm(-1) (for 2), -0.68 cm(-1) (for 3), and -2.34 cm(-1) (for 4). Compounds 1 and 3 have the same cation complex [[Mn(bpy)(H(2)O)](2)(mu-ClCH(2)COO)(2)(mu-O)](2+), but, while 1 shows an antiferromagnetic coupling, for 3 the magnetic interaction between Mn(III) ions is very weak. The four compounds show catalase activity, and when the reaction stopped, Mn(II) compounds with different nuclearity could be obtained: binuclear [[Mn(phen)(2)](mu-ClCH(2)COO)(2)](ClO(4))(2), trinuclear [Mn(3)(bpy)(2)(mu-ClCH(2)COO)(6)], or mononuclear complexes without carboxylate. Two Mn(II) compounds without carboxylate have been characterized by X-ray diffraction: [Mn(NO(3))(2)(bpy)(2)][Mn(NO(3))(bpy)(2)(H(2)O)]NO(3) (5) and [Mn(bpy)(3)](ClO(4))(2).0.5 C(6)H(4)-1,2-(COOEt)(2).0.5H(2)O (8).
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Affiliation(s)
- Gema Fernández
- Departament de Química Inorgànica, Facultat de Química, Universitat de Barcelona, Martí i Franquès 1-11, 08028-Barcelona, Spain
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50
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Wu AJ, Penner-Hahn JE, Pecoraro VL. Structural, spectroscopic, and reactivity models for the manganese catalases. Chem Rev 2004; 104:903-38. [PMID: 14871145 DOI: 10.1021/cr020627v] [Citation(s) in RCA: 404] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amy J Wu
- Willard H Dow Laboratories, Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109-1055, USA
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