51
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Wischang D, Radlow M, Hartung J. Vanadate-dependent bromoperoxidases from Ascophyllum nodosum in the synthesis of brominated phenols and pyrroles. Dalton Trans 2013; 42:11926-40. [PMID: 23881071 DOI: 10.1039/c3dt51582f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
Bromoperoxidases from the brown alga Ascophyllum nodosum, abbreviated as V(Br)PO(AnI) and V(Br)PO(AnII), show 41% sequence homology and differ by a factor of two in the percentage of α-helical secondary structures. Protein monomers organize into homodimers for V(Br)PO(AnI) and hexamers for V(Br)PO(AnII). Bromoperoxidase II binds hydrogen peroxide and bromide by approximately one order of magnitude stronger than V(Br)PO(AnI). In oxidation catalysis, bromoperoxidases I and II turn over hydrogen peroxide and bromide similarly fast, yielding in morpholine-4-ethanesulfonic acid (MES)-buffered aqueous tert-butanol (pH 6.2) molecular bromine as reagent for electrophilic hydrocarbon bromination. Alternative compounds, such as tribromide and hypobromous acid are not sufficiently electrophilic for being directly involved in carbon-bromine bond formation. A decrease in electrophilicity from bromine via hypobromous acid to tribromide correlates in a frontier molecular orbital (FMO) analysis with larger energy gaps between the π-type HOMO of, for example, an alkene and the σ*(Br,X)-type LUMO of the bromination reagent. By using this approach, the reactivity of substrates and selectivity for carbon-bromine bond formation in reactions mediated by vanadate-dependent bromoperoxidases become predictable, as exemplified by the synthesis of bromopyrroles occurring naturally in marine sponges of the genera Agelas, Acanthella, and Axinella.
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Affiliation(s)
- Diana Wischang
- Fachbereich Chemie, Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Straße, D-67663 Kaiserslautern, Germany
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52
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Baharum H, Chu WC, Teo SS, Ng KY, Rahim RA, Ho CL. Molecular cloning, homology modeling and site-directed mutagenesis of vanadium-dependent bromoperoxidase (GcVBPO1) from Gracilaria changii (Rhodophyta). PHYTOCHEMISTRY 2013; 92:49-59. [PMID: 23684235 DOI: 10.1016/j.phytochem.2013.04.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2012] [Revised: 03/01/2013] [Accepted: 04/22/2013] [Indexed: 06/02/2023]
Abstract
Vanadium-dependent haloperoxidases belong to a class of vanadium enzymes that may have potential industrial and pharmaceutical applications due to their high stability. In this study, the 5'-flanking genomic sequence and complete reading frame encoding vanadium-dependent bromoperoxidase (GcVBPO1) was cloned from the red seaweed, Fracilaria changii, and the recombinant protein was biochemically characterized. The deduced amino acid sequence of GcVBPO1 is 1818 nucleotides in length, sharing 49% identity with the vanadium-dependent bromoperoxidases from Corralina officinalis and Cor. pilulifera, respectively. The amino acid residues associated with the binding site of vanadate cofactor were found to be conserved. The Km value of recombinant GcVBPO1 for Br(-) was 4.69 mM, while its Vmax was 10.61 μkat mg(-1) at pH 7. Substitution of Arg(379) with His(379) in the recombinant protein caused a lower affinity for Br(-), while substitution of Arg(379) with Phe(379) not only increased its affinity for Br(-) but also enabled the mutant enzyme to oxidize Cl(-). The mutant Arg(379)Phe was also found to have a lower affinity for I(-), as compared to the wild-type GcVBPO1 and mutant Arg(379)His. In addition, the Arg(379)Phe mutant has a slightly higher affinity for H2O2 compared to the wild-type GcVBPO1. Multiple cis-acting regulatory elements associated with light response, hormone signaling, and meristem expression were detected at the 5'-flanking genomic sequence of GcVBPO1. The transcript abundance of GcVBPO1 was relatively higher in seaweed samples treated with 50 parts per thousand (ppt) artificial seawater (ASW) compared to those treated in 10 and 30 ppt ASW, in support of its role in the abiotic stress response of seaweed.
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Affiliation(s)
- H Baharum
- Faculty of Biotechnology and Biomolecular Sciences, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor, Malaysia
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53
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Oxido-bridged dinuclear vanadium(V) Schiff base complexes derived from 1R,2S(−)-norephedrine: Synthesis, structure, characterization and catalytic studies. Polyhedron 2013. [DOI: 10.1016/j.poly.2012.10.053] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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54
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Laffy PW, Benkendorff K, Abbott CA. Suppressive subtractive hybridisation transcriptomics provides a novel insight into the functional role of the hypobranchial gland in a marine mollusc. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2013; 8:111-22. [PMID: 23422501 DOI: 10.1016/j.cbd.2013.01.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2012] [Revised: 01/18/2013] [Accepted: 01/18/2013] [Indexed: 11/28/2022]
Abstract
The hypobranchial gland present in gastropods is an organ whose function is not clearly understood. Involved in mucus production, within members of the family Muricidae it is also the source of the ancient dye Tyrian purple and its bioactive precursors. To gain further insights into hypobranchial gland biology, suppressive subtractive hybridisation was performed on hypobranchial gland and mantle tissue from the marine snail Dicathais orbita creating a differentially expressed cDNA library. 437 clones were randomly sequenced, analysed and annotated and 110 sequences had their functions putatively identified. Importantly this approach identified a putative gene involved in Tyrian purple biosynthesis, an arylsulphatase gene. Confirmation of the upregulation of arylsulphatase in the hypobranchial gland compared to the mantle was demonstrated using quantitative real-time PCR. Other genes identified as playing an important role in the hypobranchial gland were those involved in mucus protein synthesis, choline ester regulation, protein and energy production. This study confirms that the hypobranchial gland is involved in the production of mucus secretion and also identifies it as a site of chemical interaction and biosynthesis. This study lays the foundation for a better understanding of the enzymatic production of Tyrian purple precursors within the gland.
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Affiliation(s)
- Patrick W Laffy
- School of Biological Sciences, Flinders University, GPO Box 2100 Adelaide SA 5001, Australia.
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55
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Kundu S, Maity S, Maity AN, Ke SC, Ghosh P. Stabilization of oxidovanadium(iv) by organic radicals. Dalton Trans 2013; 42:4586-601. [DOI: 10.1039/c2dt32693k] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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56
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Patra S, Chatterjee S, Si TK, Mukherjea KK. Synthesis, structural characterization, VHPO mimicking peroxidative bromination and DNA nuclease activity of oxovanadium(v) complexes. Dalton Trans 2013; 42:13425-35. [DOI: 10.1039/c3dt51291f] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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57
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Wischang D, Radlow M, Schulz H, Vilter H, Viehweger L, Altmeyer MO, Kegler C, Herrmann J, Müller R, Gaillard F, Delage L, Leblanc C, Hartung J. Molecular cloning, structure, and reactivity of the second bromoperoxidase from Ascophyllum nodosum. Bioorg Chem 2012; 44:25-34. [PMID: 22884431 DOI: 10.1016/j.bioorg.2012.05.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2012] [Revised: 04/30/2012] [Accepted: 05/21/2012] [Indexed: 11/16/2022]
Abstract
The sequence of bromoperoxidase II from the brown alga Ascophyllum nodosum was determined from a full length cloned cDNA, obtained from a tandem mass spectrometry RT-PCR-approach. The clone encodes a protein composed of 641 amino-acids, which provides a mature 67.4 kDa-bromoperoxidase II-protein (620 amino-acids). Based on 43% sequence homology with the previously characterized bromoperoxidase I from A. nodosum, a tertiary structure was modeled for the bromoperoxidase II. The structural model was refined on the basis of results from gel filtration and vanadate-binding studies, showing that the bromoperoxidase II is a hexameric metalloprotein, which binds 0.5 equivalents of vanadate as cofactor per 67.4 kDa-subunit, for catalyzing oxidation of bromide by hydrogen peroxide in a bi-bi-ping-pong mechanism (k(cat) = 153 s(-1), 22 °C, pH 5.9). Bromide thereby is converted into a bromoelectrophile of reactivity similar to molecular bromine, based on competition kinetic data on phenol bromination and correlation analysis. Reactivity provided by the bromoperoxidase II mimics biosynthesis of methyl 4-bromopyrrole-2-carboxylate, a natural product isolated from the marine sponge Axinella tenuidigitata.
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Affiliation(s)
- Diana Wischang
- Fachbereich Chemie, Organische Chemie, Technische Universität Kaiserslautern, Erwin-Schrödinger-Strasse, D-67663 Kaiserslautern, Germany
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58
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Maurya MR, Bisht M, Chaudhary N, Kumar A, Avecilla F, Costa Pessoa J. Spectroscopic and Structural Characterization of Noninnocent Mixed-Ligand Oxidovanadium(V) Complexes. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200656] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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59
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Silavi R, Divsalar A, Saboury AA. A short review on the structure-function relationship of artificial catecholase/tyrosinase and nuclease activities of Cu-complexes. J Biomol Struct Dyn 2012; 30:752-72. [PMID: 22731989 DOI: 10.1080/07391102.2012.689704] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
The synthesis of metal complexes has vastly increased the scope of research for many scientists during the two last decades. Among these compounds, artificial tyrosinases, catecholases, proteases, and nucleases are some of the most studied due to their importance as modern tools in the fields of medicine, scientific research, and industry. Transition metals such as Zn(2+), Cu(2+), Fe(3+), Co(3+), Ni(2+), and lanthanide ions are the most commonly used. Among these ions, copper complexes have been the focus of the majority of studies thanks to their significant activity in comparison with other ions. Studies of copper-based tyrosinases, catecholases, and nucleases have revealed some of the overarching factors affecting reactions of all three types, which has led to improved activity and efficiency for all. Key factors include proper core-core distance, (Cu⋯Cu distance 2.90-2.99 Å), suitable solvent, and ligands with proper hydrophobic structure and geometry. In the present investigation, we review and introduce the proposed mechanisms and the kinetically effective factors of natural catecholase, tyrosinase, and nuclease and their Cu-based synthetic mimics.
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Affiliation(s)
- Reza Silavi
- Department of Biological Sciences, Kharazmi (Tarbiat Moallem) University, Tehran, Iran
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60
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Kraehmer V, Rehder D. Modelling the site of bromide binding in vanadate-dependent bromoperoxidases. Dalton Trans 2012; 41:5225-34. [PMID: 22415551 DOI: 10.1039/c2dt12287a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2024]
Abstract
Treatment of Boc-protected (S)-serine (Ser) methyl ester with triphenylphosphine bromide Ph(3)PBr (intermittently generated from PPh(3) and N-bromosuccinimide) yields Boc-3-bromoalanine (R)-Boc-BrAlaMe and, after deprotection, bromoalanine methyl ester (R)-BrAlaMe in the form of its hydrobromide. Boc-BrAlaMe and BrAlaMe have been structurally characterised. The reaction between BrAlaMe, salicylaldehyde (sal) and VO(2+) results in the formation of Schiff base complexes of composition [VO(sal-BrAlaMe)solv](+) (solv = CH(3)OH: 3, THF: 5) and [VO(sal-BrAla)THF] 4. DFT calculations of the structures of 3, 4 and 5, based on the B3LYP functional and employing the triple zeta basis set 6-311++g(d,p), provide distances Br···V = 4.0 ± 0.1 Å, if some distortion of the dihedral angle ∠N-C-C-Br is allowed (affording a maximum energy of ca. 45 kJ mol(-1)), and thus model Br···V distances detected by X-ray methods in bromoperoxidases from the marine algae Ascophyllum nodosum and Corallina pilulifera. The DFT calculations have been validated by comparing calculated and found structures, including the new complex [V(V)O(Amp-sal)OMe(MeOH)] (1, Amp is the aminophenol moiety) and the known complex [VO(L-Ser-van)H(2)O] (van = vanillin). Additional validation has been undertaken by checking experimental against calculated (BHandHLYP) EPR spectroscopic hyperfine coupling constants. Complexes containing bromine as a substituent at the phenyl moiety of a Schiff base ligand do not allow for an appropriate simulation of the Br···V distance in peroxidases. The closest agreement, d(Br···V) = 4.87 Å, is achieved with [VO(3Br-salSer)THF] (6), where 3Brsal-Ser is the dianionic Schiff base formed between 3-Br-5-NO(2)-salicylaldehyde and serine.
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Affiliation(s)
- Verena Kraehmer
- Chemistry Department, University of Hamburg, D-20147 Hamburg, Germany
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61
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Maurya MR, Haldar C, Khan AA, Azam A, Salahuddin A, Kumar A, Costa Pessoa J. Synthesis, Characterization, Catalytic and Antiamoebic Activity of Vanadium Complexes of Binucleating Bis(dibasic tridentate ONS donor) Ligand Systems. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200012] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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62
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Sutradhar M, Barman TR, Mukherjee G, Drew MG, Ghosh S. Oxidoalkoxidovanadium(V) complexes: Synthesis, characterization and comparison of X-ray crystal structures. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.12.022] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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63
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Plass W. Chiral and supramolecular model complexes for vanadium haloperoxidases: Host–guest systems and hydrogen bonding relays for vanadate species. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2011.04.014] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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64
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MAURYA MANNARR. Structural models of vanadate-dependent haloperoxidases, their reactivity, immobilization on polymer support and catalytic activities. J CHEM SCI 2011. [DOI: 10.1007/s12039-011-0114-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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65
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Manabe F, Shoun H, Wakagi T. Conserved residues in membrane-bound acid pyrophosphatase from Sulfolobus tokodaii, a thermoacidophilic archaeon. Extremophiles 2011; 15:359-64. [PMID: 21461791 DOI: 10.1007/s00792-011-0367-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2010] [Accepted: 03/08/2011] [Indexed: 11/25/2022]
Abstract
A membrane-intrinsic acid pyrophosphatase (ST2226) from Sulfolobus tokodaii, a thermoacidophilic archaeon, is possibly involved in glycoprotein biosynthesis and belongs to the phosphatidic acid phosphatase class 2 superfamily, including both membrane-intrinsic and soluble enzymes with divergent functions ranging from dephosphorylation of undecaprenylpyrophosphate and phospho-monoesters such as glucose-6-phosphate to vanadium-containing chloroperoxidation. ST2226 is an archaeal ortholog of these enzymes sharing a common phosphatase motif. Through site-directed mutagenesis as to each of the conserved residues, the catalytic roles of the latter were deduced, as well as the transmembrane topology with all the conserved residues in close proximity to the outside of the membrane.
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Affiliation(s)
- Fumitoshi Manabe
- Department of Biotechnology, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-8657, Japan
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66
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Bernhardt P, Okino T, Winter JM, Miyanaga A, Moore BS. A stereoselective vanadium-dependent chloroperoxidase in bacterial antibiotic biosynthesis. J Am Chem Soc 2011; 133:4268-70. [PMID: 21384874 DOI: 10.1021/ja201088k] [Citation(s) in RCA: 97] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Halogenases catalyze reactions that introduce halogen atoms into electron-rich organic molecules. Vanadium-dependent haloperoxidases are generally considered to be promiscuous halogenating enzymes that have thus far been derived exclusively from eukaryotes, where their cellular function is often disputed. We now report the first biochemical characterization of a bacterial vanadium-dependent chloroperoxidase, NapH1 from Streptomyces sp. CNQ-525, which catalyzes a highly stereoselective chlorination-cyclization reaction in napyradiomycin antibiotic biosynthesis. This finding biochemically links a vanadium chloroperoxidase to microbial natural product biosynthesis.
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Affiliation(s)
- Peter Bernhardt
- Scripps Institution of Oceanography, University of California, San Diego, California 92093, USA
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67
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Roy AS, Saha P, Adhikary ND, Ghosh P. o-Iminobenzosemiquinonate and o-imino-p-methylbenzosemiquinonate anion radicals coupled VO2+ stabilization. Inorg Chem 2011; 50:2488-500. [PMID: 21348449 DOI: 10.1021/ic102296p] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The diamagnetic VO(2+)-iminobenzosemiquinonate anion radical (L(R)(IS)(•-), R = H, Me) complexes, (L(-))(VO(2+))(L(R)(IS)(•-)): (L(1)(-))(VO(2+))(L(H)(IS)(•-))•3/2MeOH (1•3/2MeOH), (L(2)(-))(VO(2+))(L(H)(IS)(•-)) (2), and (L(2)(-))(VO(2+))(L(Me)(IS)(•-))•1/2 L(Me)(AP) (3•1/2 L(Me)(AP)), incorporating tridentate monoanionic NNO-donor ligands {L = L(1)(-) or L(2)(-), L(1)H = (2-[(phenylpyridin-2-yl-methylene)amino]phenol; L(2)H = 1-(2-pyridylazo)-2-naphthol; L(H)(IS)(•-) = o-iminobenzosemiquinonate anion radical; L(Me)(IS)(•-) = o-imino-p-methylbenzosemiquinonate anion radical; and L(Me)(AP) = o-amino-p-methylphenol} have been isolated and characterized by elemental analyses, IR, mass, NMR, and UV-vis spectra, including the single-crystal X-ray structure determinations of 1•3/2MeOH and 3•1/2 L(Me)(AP). Complexes 1•3/2MeOH, 2, and 3•1/2 L(Me)(AP) absorb strongly in the visible region because of intraligand (IL) and ligand-to-metal charge transfers (LMCT). 1•3/2MeOH is luminescent (λ(ext), 333 nm; λ(em), 522, 553 nm) in frozen dichloromethane-toluene glass at 77 K due to π(diimine→)π(diimine)* transition. The V-O(phenolato) (cis to the V═O) lengths, 1.940(2) and 1.984(2) Å, respectively, in 1•3/2MeOH and 3•1/2 L(Me)(AP) are consistent with the VO(2+) description. The V-O(iminosemiquinonate) (trans to the V═O) lengths, 2.1324(19) in 1•3/2MeOH and 2.083(2) Å in 3•1/2 L(Me)(AP), are expectedly ∼0.20 Å longer due to the trans influence of the V═O bond. Because of the stronger affinity of the paramagnetic VO(2+) ion to the L(H)(IS)(•-) or L(Me)(IS)(•-), the V-N(iminosemiquinonate) lengths, 1.908(2) and 1.921(2) Å, respectively, in 1•3/2MeOH and 3•1/2 L(Me)(AP), are unexpectedly shorter. Density functional theory (DFT) calculations using B3LYP, B3PW91, and PBE1PBE functionals on 1 and 2 have established that the closed shell singlet (CSS) solutions (VO(3+)-amidophenolato (L(R)(AP)(2-)) coordination) of these complexes are unstable with respect to triplet perturbations. But BS (1,1) M(s) = 0 (VO(2+)-iminobenzosemiquinonate anion radical (L(R)(IS)(•-)) coordination) solutions of these species are stable and reproduce the experimental bond parameters well. Spin density distributions of one electron oxidized cations are consistent with the [(L(-))(VO(2+))(L(R)(IQ))](+) descriptions [VO(2+)-o-iminobenzoquinone (L(R)(IQ)) coordination], and one electron reduced anions are consistent with the [(L(•2-))(VO(3+))(L(R)(AP)(2-))](-) descriptions [VO(3+)-amidophenolato (L(R)(AP)(2-)) coordination], incorporating the diimine anion radical (L(1)(•2-)) or azo anion radical (L(2)(3-)). Although, cations and anions are not isolable, but electro-and spectro-electrochemical experiments have shown that 3(+) and 3(-) ions are more stable than 1(+), 2(+) and 1(-), 2(-) ions. In all cases, the reductions occur with simultaneous two electron transfer, may be due to formation of coupled diimine/azo anion radical-VO(2+) species as in [(L(•2-))(VO(2+))(L(R)(AP)(2-))](2-).
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Affiliation(s)
- Amit Saha Roy
- Department of Chemistry, R. K. Mission Residential College, Narendrapur, Kolkata-103, India
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68
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Maurya MR, Bisht M, Kumar A, Kuznetsov ML, Avecilla F, Pessoa JC. Synthesis, characterization, reactivity and catalytic activity of oxidovanadium(iv), oxidovanadium(v) and dioxidovanadium(v) complexes of benzimidazole modified ligands. Dalton Trans 2011; 40:6968-83. [DOI: 10.1039/c1dt10261c] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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69
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Synthesis, structure and solution chemistry of dioxidovanadium(V) complexes with a family of hydrazone ligands. Evidence of formation of centrosymmetric dimers via H-bonds in the solid state. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.03.053] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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70
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Pacios LF, Gálvez O. Active Site, Catalytic Cycle, and Iodination Reactions of Vanadium Iodoperoxidase: A Computational Study. J Chem Theory Comput 2010; 6:1738-52. [DOI: 10.1021/ct100041x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Luis F. Pacios
- Departamento de Biotecnología, Unidad de Química y Bioquímica, E.TSI Montes, Universidad Politécnica de Madrid, 28040 Madrid, Spain, and Departamento de Física Molecular, Instituto de Estructura de la Materia, C.S.I.C., Serrano 121, 28006 Madrid, Spain
| | - Oscar Gálvez
- Departamento de Biotecnología, Unidad de Química y Bioquímica, E.TSI Montes, Universidad Politécnica de Madrid, 28040 Madrid, Spain, and Departamento de Física Molecular, Instituto de Estructura de la Materia, C.S.I.C., Serrano 121, 28006 Madrid, Spain
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71
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Martinez A, Robert V, Gornitzka H, Dutasta JP. Controlling Helical Chirality in Atrane Structures: Solvent-Dependent Chirality Sense in Hemicryptophane-Oxidovanadium(V) Complexes. Chemistry 2010; 16:520-7. [PMID: 19918819 DOI: 10.1002/chem.200901976] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Alexandre Martinez
- Laboratoire de Chimie, CNRS, Ecole Normale Supérieure de Lyon, 46 Allée d'Italie, 69364 Lyon 07, France
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72
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Maurya MR, Khan AA, Azam A, Ranjan S, Mondal N, Kumar A, Avecilla F, Pessoa JC. Vanadium complexes having [VIVO]2+ and [VVO2]+cores with binucleating dibasic tetradentate ligands: Synthesis, characterization, catalytic and antiamoebic activities. Dalton Trans 2010; 39:1345-60. [DOI: 10.1039/b915752b] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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73
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Fenn A, Wächtler M, Gutmann T, Breitzke H, Buchholz A, Lippold I, Plass W, Buntkowsky G. Correlations between (51)V solid-state NMR parameters and chemical structure of vanadium (V) complexes as models for related metalloproteins and catalysts. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2009; 36:192-201. [PMID: 20045295 DOI: 10.1016/j.ssnmr.2009.11.003] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2009] [Revised: 11/23/2009] [Accepted: 11/25/2009] [Indexed: 05/28/2023]
Abstract
The parameters describing the quadrupolar and CSA interactions of 51V solid-state MAS NMR investigations of model complexes mimicking vanadoenzymes as well as vanadium containing catalysts and enzyme complexes are interpreted with respect to the chemical structure. The interpretation is based on the data of 15 vanadium complexes including two new complexes with previously unpublished data and 13 complexes with data previously published by us. Correlations between the chemical structure and the 51V solid-state NMR data of this class of compounds have been established. Especially for the isotropic chemical shift delta(iso) and the chemical shift anisotropy delta(sigma), correlations with specific structural features like the coordination number of the vanadium atom, the number of coordinating nitrogens, the number of oxygen atoms and the chemical surrounding of the complex could be established for these compounds. Moreover, quantitative correlations between the solid-state NMR parameters and specific bond angles and bond lengths have been obtained. Our results can be of particular interest for future investigations concerning the structure and the mode of action of related vanadoenzymes and vanadate protein assemblies, including the use of vanadate adducts as transition state analogs for phosphate metabolizing systems.
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Affiliation(s)
- Annika Fenn
- Institut für Physikalische Chemie, Friedrich-Schiller-Universität Jena, Helmholtzweg 4, D-07743 Jena, Germany
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74
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Gutmann T, Schweitzer A, Wächtler M, Breitzke H, Buchholz A, Plass W, Buntkowsky G. DFT Calculations of 51V Solid-State NMR Parameters of Vanadium(V) Model Complexes. ACTA ACUST UNITED AC 2009. [DOI: 10.1524/zpch.2008.5401] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Two cis-dioxovanadium(V) complexes and three monooxovanadium(V) complexes with different coordination numbers and ligand spheres, serving as model complexes for vanadium haloperoxidases, were studied by 51V solid-state NMR spectroscopy. The most important 51V solid-state NMR parameters (quadrupolar coupling constant C
Q
, asymmetry of the EFG tensor η
Q
, isotropic chemical shift δ
iso
, chemical shift anisotropy δ
σ
, asymmetry of the CSA tensor η
σ
and the Euler angles α, β and γ) describing the quadrupolar and chemical shift anisotropy interactions were determined theoretically with DFT methods employing the B3LYP functional and experimentally using genetic fitting algorithms. Calculations of δ
iso
values were treated with different referencing values of VOCl3 computed with different-sized basis sets using the “counterpoise method”. The calculated C
Q
values were discussed in terms of the quadrupolar moment Q. Absolute tensor orientations of CSA and EFG tensors were computed by DFT. These orientations were found to correlate to structural features of the model complexes.
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75
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Abstract
In nature, halogenation is a strategy used to increase the biological activity of secondary metabolites, compounds that are often effective as drugs. However, halides are not particularly reactive unless they are activated, typically by oxidation. The pace of discovery of new enzymes for halogenation is increasing, revealing new metalloenzymes, flavoenzymes, S-adenosyl-L-methionine (SAM)-dependent enzymes and others that catalyse halide oxidation using dioxygen, hydrogen peroxide and hydroperoxides, or that promote nucleophilic halide addition reactions.
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76
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Winter JM, Moore BS. Exploring the chemistry and biology of vanadium-dependent haloperoxidases. J Biol Chem 2009; 284:18577-81. [PMID: 19363038 DOI: 10.1074/jbc.r109.001602] [Citation(s) in RCA: 164] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Nature has developed an exquisite array of methods to introduce halogen atoms into organic compounds. Most of these enzymes are oxidative and require either hydrogen peroxide or molecular oxygen as a cosubstrate to generate a reactive halogen atom for catalysis. Vanadium-dependent haloperoxidases contain a vanadate prosthetic group and utilize hydrogen peroxide to oxidize a halide ion into a reactive electrophilic intermediate. These metalloenzymes have a large distribution in nature, where they are present in macroalgae, fungi, and bacteria, but have been exclusively characterized in eukaryotes. In this minireview, we highlight the chemistry and biology of vanadium-dependent haloperoxidases from fungi and marine algae and the emergence of new bacterial members that extend the biological function of these poorly understood halogenating enzymes.
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Affiliation(s)
- Jaclyn M Winter
- Center for Marine Biotechnology and Biomedicine, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, California 92093, USA
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78
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Littlechild J, Garcia Rodriguez E, Isupov M. Vanadium containing bromoperoxidase – Insights into the enzymatic mechanism using X-ray crystallography. J Inorg Biochem 2009; 103:617-21. [DOI: 10.1016/j.jinorgbio.2009.01.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 01/06/2009] [Accepted: 01/17/2009] [Indexed: 11/28/2022]
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79
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Wagner C, El Omari M, König GM. Biohalogenation: nature's way to synthesize halogenated metabolites. JOURNAL OF NATURAL PRODUCTS 2009; 72:540-553. [PMID: 19245259 DOI: 10.1021/np800651m] [Citation(s) in RCA: 156] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Halogenated natural products are widely distributed in nature, some of them showing potent biological activities. Incorporation of halogen atoms in drug leads is a common strategy to modify molecules in order to vary their bioactivities and specificities. Chemical halogenation, however, often requires harsh reaction conditions and results in unwanted byproduct formation. It is thus of great interest to investigate the biosynthesis of halogenated natural products and the biotechnological potential of halogenating enzymes. This review aims to give a comprehensive overview on the current knowledge concerning biological halogenations.
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Affiliation(s)
- Claudia Wagner
- Institute for Pharmaceutical Biology, University of Bonn, Nussallee 6, D-53115 Bonn, Germany
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80
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Li ZP, Xing YH, Cao YZ, Zeng XQ, Ge MF, Niu SY. Synthesis, structure and properties of a series of scorpionate oxovanadium(IV)–carboxylate complexes. Polyhedron 2009. [DOI: 10.1016/j.poly.2008.12.055] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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81
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Sosa-Torres ME, Kroneck PMH. Interaction of Cyanide with Enzymes Containing Vanadium, Manganese, Non-Heme Iron, and Zinc. METAL-CARBON BONDS IN ENZYMES AND COFACTORS 2009. [DOI: 10.1039/9781847559333-00363] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Since the early discovery of Prussian Blue, cyano transition metal complexes have played a fundamental role in coordination chemistry. They represent important compounds with fascinating chemical and physical properties which turn them into valuable tools for both chemists and biologists. HCN as a precursor in prebiotic chemistry has gained interest in view of its polymers being involved in the formation of amino acids, purines, and orotic acid, a biosynthetic precursor of uracil. Clearly, the rapid formation of adenine by aqueous polymerization of HCN is one of the key discoveries in these experiments. The cyanide anion is usually toxic for most aerobic organisms because of its inhibitory effects on respiratory enzymes, but as a substrate it is an important source of carbon and nitrogen for microorganisms, fungi and plants. Most interestingly, the cyanide anion is a ligand of important metal-dependent biomolecules, such as the hydrogenases and the cobalt site in vitamin B12.
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Affiliation(s)
- Martha E. Sosa-Torres
- Facultad de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria Coyoacán, 04510, D.F. México México
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82
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Wächtler M, Schweitzer A, Gutmann T, Breitzke H, Buntkowsky G. Efficient analysis of (51)V solid-state MAS NMR spectra using genetic algorithms. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2009; 35:37-48. [PMID: 19128946 DOI: 10.1016/j.ssnmr.2008.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2008] [Revised: 11/05/2008] [Accepted: 11/11/2008] [Indexed: 05/27/2023]
Abstract
A program for iterative fitting procedures to determine the NMR parameters from (51)V solid-state MAS NMR spectra was developed. It contains options to use genetic algorithms and downhill-simplex optimizing procedures to extract the optimal parameter sets, which describe our spectra. As computational kernel the SIMPSON program is employed. Other kernels like SPINEVOLUTION are easily incorporable. The algorithms are checked for their suitability for the present optimization problem and optimal simulation conditions are determined, with the focus on minimal processing time. The procedure leads to a very good agreement between experimental and simulated spectra in a passable period of time. First results for spectra of model compounds for the active site of vanadium haloperoxidases are presented.
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Affiliation(s)
- Maria Wächtler
- Institut für Physikalische Chemie, Friedrich-Schiller-Universität, Jena, Helmholtzweg 4, D-07743 Jena, Germany
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83
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84
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Zhang Y, Gascón JA. QM/MM investigation of structure and spectroscopic properties of a vanadium-containing peroxidase. J Inorg Biochem 2008; 102:1684-90. [DOI: 10.1016/j.jinorgbio.2008.04.006] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2008] [Revised: 04/09/2008] [Accepted: 04/21/2008] [Indexed: 11/25/2022]
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85
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Schweitzer A, Gutmann T, Wächtler M, Breitzke H, Buchholz A, Plass W, Buntkowsky G. (51)V solid-state NMR investigations and DFT studies of model compounds for vanadium haloperoxidases. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2008; 34:52-67. [PMID: 18342494 DOI: 10.1016/j.ssnmr.2008.02.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Indexed: 05/26/2023]
Abstract
Three cis-dioxovanadium(V) complexes with similar N-salicylidenehydrazide ligands modeling hydrogen bonding interactions of vanadate relevant for vanadium haloperoxidases are studied by (51)V solid-state NMR spectroscopy. Their parameters describing the quadrupolar and chemical shift anisotropy interactions (quadrupolar coupling constant C(Q), asymmetry of the quadrupolar tensor eta(Q), isotropic chemical shift delta(iso), chemical shift anisotropy delta(sigma), asymmetry of the chemical shift tensor eta(sigma) and the Euler angles alpha, beta and gamma) are determined both experimentally and theoretically using DFT methods. A comparative study of different methods to determine the NMR parameters by numerical simulation of the spectra is presented. Detailed theoretical investigations on the DFT level using various basis sets and structural models show that by useful choice of the methodology, the calculated parameters agree to the experimental ones in a very good manner.
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Affiliation(s)
- Annika Schweitzer
- Institut für Physikalische Chemie, Friedrich-Schiller-Universität Jena, Helmholtzweg 4, D-07743 Jena, Germany
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86
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Neumann CS, Fujimori DG, Walsh CT. Halogenation strategies in natural product biosynthesis. ACTA ACUST UNITED AC 2008; 15:99-109. [PMID: 18291314 DOI: 10.1016/j.chembiol.2008.01.006] [Citation(s) in RCA: 230] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2007] [Revised: 01/06/2008] [Accepted: 01/22/2008] [Indexed: 10/22/2022]
Abstract
Halogenation is a frequent modification of secondary metabolites and can play a significant role in establishing the bioactivity of a compound. Enzymatic halogenation through oxidative mechanisms is the most common route to these metabolites, though direct halogenation via halide anion incorporation is also known to proceed through both enzymatic and nonenzymatic pathways. In this article, we review the current state of knowledge regarding the mechanisms of these transformations, highlight applications of this knowledge, and propose future opportunities and challenges for the field.
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Affiliation(s)
- Christopher S Neumann
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA
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87
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Pooransingh-Margolis N, Renirie R, Hasan Z, Wever R, Vega AJ, Polenova T. 51V solid-state magic angle spinning NMR spectroscopy of vanadium chloroperoxidase. J Am Chem Soc 2007; 128:5190-208. [PMID: 16608356 DOI: 10.1021/ja060480f] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report 51V solid-state NMR spectroscopy of the 67.5-kDa vanadium chloroperoxidase, at 14.1 T. We demonstrate that, despite the low concentration of vanadium sites in the protein (one per molecule, 1 mumol of vanadium spins in the entire sample), the spinning sideband manifold spanning the central and the satellite transitions is readily detectable. The quadrupolar and chemical shift anisotropy tensors have been determined by numerical simulations of the spinning sideband envelopes and the line shapes of the individual spinning sidebands corresponding to the central transition. The observed quadrupolar coupling constant C(Q) of 10.5 +/- 1.5 MHz and chemical shift anisotropy delta(sigma) of -520 +/- 13 ppm are sensitive reporters of the geometric and electronic structure of the vanadium center. Density functional theory calculations of the NMR spectroscopic observables for an extensive series of active site models indicate that the vanadate cofactor is most likely anionic with one axial hydroxo- group and an equatorial plane consisting of one hydroxo- and two oxo- groups. The work reported in this manuscript is the first example of 51V solid-state NMR spectroscopy applied to probe the vanadium center in a protein directly. This approach yields the detailed coordination environment of the metal unavailable from other experimental measurements and is expected to be generally applicable for studies of diamagnetic vanadium sites in metalloproteins.
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Affiliation(s)
- Neela Pooransingh-Margolis
- Brown Laboratories, Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
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88
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Moriuchi T, Nishiyama M, Beppu T, Hirao T, Rehder D. Structural Characterization of a Dioxovanadium(V) Complex with 4,8-Dihydroxyquinoline-2-carboxylic Acid. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2007. [DOI: 10.1246/bcsj.80.957] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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89
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Nica S, Rudolph M, Görls H, Plass W. Structural characterization and electrochemical behavior of oxovanadium(V) complexes with N-salicylidene hydrazides. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2006.09.018] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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90
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Lippold I, Görls H, Plass W. New Aspects for Modeling Supramolecular Interactions in Vanadium Haloperoxidases: β-Cyclodextrin Inclusion Compounds ofcis-Dioxovanadium(V) Complexes. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601225] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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91
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Leblanc C, Colin C, Cosse A, Delage L, La Barre S, Morin P, Fiévet B, Voiseux C, Ambroise Y, Verhaeghe E, Amouroux D, Donard O, Tessier E, Potin P. Iodine transfers in the coastal marine environment: the key role of brown algae and of their vanadium-dependent haloperoxidases. Biochimie 2006; 88:1773-85. [PMID: 17007992 DOI: 10.1016/j.biochi.2006.09.001] [Citation(s) in RCA: 125] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2006] [Accepted: 09/01/2006] [Indexed: 11/22/2022]
Abstract
Brown algal kelp species are the most efficient iodine accumulators among all living systems, with an average content of 1.0% of dry weight in Laminaria digitata, representing a ca. 30,000-fold accumulation of this element from seawater. Like other marine macroalgae, kelps are known to emit volatile short-lived organo-iodines, and molecular iodine which are believed to be a main vector of the iodine biogeochemical cycle as well as having a significant impact on atmospheric chemistry. Therefore, radioactive iodine can potentially accumulate in seaweeds and can participate in the biogeochemical cycling of iodine, thereby impacting human health. From a radioecological viewpoint, iodine-129 (129I, half-life of 1.6 x 10(7) years) is one of the most persistent radionuclide released from nuclear facilities into the environment. In this context, the speciation of iodine by seaweeds is of special importance and there is a need to further understand the mechanisms of iodine uptake and emission by kelps. Recent results on the physiological role and biochemistry of the vanadium haloperoxidases of brown algae emphasize the importance of these enzymes in the control of these processes.
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Affiliation(s)
- Catherine Leblanc
- Centre national de la recherche scientifique, université Pierre et Marie Curie-Paris-VI, laboratoire international Associé-Dispersal and Adaptation in Marine Species, unité mixte de recherche 7139, 29682 Roscoff cedex, France.
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92
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Maurya MR. Structural models of vanadate-dependent haloperoxidases and their reactivity. J CHEM SCI 2006. [DOI: 10.1007/bf02703947] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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93
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Coupe EE, Smyth MG, Fosberry AP, Hall RM, Littlechild JA. The dodecameric vanadium-dependent haloperoxidase from the marine algae Corallina officinalis: cloning, expression, and refolding of the recombinant enzyme. Protein Expr Purif 2006; 52:265-72. [PMID: 17049263 DOI: 10.1016/j.pep.2006.08.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2006] [Accepted: 08/19/2006] [Indexed: 10/24/2022]
Abstract
The dodecameric vanadium-dependent bromoperoxidase from Corallina officinalis has been cloned and over-expressed in Escherichia coli. However, the enzyme was found to be predominantly in the form of inclusion bodies. This protein presents a challenging target for refolding, both due to the size (768kDa) and quaternary structure (12x64kDa). Successful refolding conditions have been established which result in an increase in the final yield of active bromoperoxidase from 0.5mg to 40mg per litre of culture. The refolded protein has been characterised and compared to the native enzyme and was shown to be stable at temperatures of 80 degrees C, over a pH range 5.5-10 and in organic solvents such as ethanol, acetonitrile, methanol, and acetone. The novel refolding approach reported in this paper opens up the full potential of this versatile enzyme for use in large scale biotransformation studies.
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Affiliation(s)
- E E Coupe
- The Henry Wellcome Building for Biocatalysis, School of Biosciences, University of Exeter, Exeter EX4 4QD, UK
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94
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Tapper S, Littlechild JA, Molard Y, Prokes I, Tucker JHR. Anion Binding Tripodal Receptors as Structural Models for the Active Site of Vanadium Haloperoxidases and Acid Phosphatases. Supramol Chem 2006. [DOI: 10.1080/10610270500368840] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Sophia Tapper
- a School of Biosciences, University of Exeter , Stocker Road, Exeter, EX4 4QD, UK
| | | | - Yann Molard
- a School of Biosciences, University of Exeter , Stocker Road, Exeter, EX4 4QD, UK
| | - Ivan Prokes
- a School of Biosciences, University of Exeter , Stocker Road, Exeter, EX4 4QD, UK
| | - James H. R. Tucker
- b School of Chemistry, University of Birmingham , Edgbaston, Birmingham, B15 2TT, UK
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95
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Zampella G, Fantucci P, Pecoraro VL, De Gioia L. Insight into the Catalytic Mechanism of Vanadium Haloperoxidases. DFT Investigation of Vanadium Cofactor Reactivity. Inorg Chem 2006; 45:7133-43. [PMID: 16933914 DOI: 10.1021/ic060555g] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Density functional theory (DFT) has been used to investigate the catalytic properties of the isolated vanadium cofactor found in vanadium haloperoxidases, with a particular emphasis on the steps going from the resting form of the cofactor to the peroxo complex. Computation of transition states, intermediate species, and UV-vis spectra, as well as comparison of reaction energies, demonstrated the important role of protonation in cofactor activation. This illustrates that the resting form of the vanadium cofactor reacts with hydrogen peroxide according to a mechanism that implies formation of an aqua complex, release of the apical water molecule according to a dissociative pathway, and binding of hydrogen peroxide to vanadium. This process leads to a side-on peroxo species corresponding to the peroxo form observed in the enzyme. In addition, it appears that an acid-base catalysts strongly accelerates the conversion to the side-on peroxo form. The comparison of computed and experimental UV-vis spectra corroborated the proposed reaction pathway and allowed us to explain the effects of the vanadium ligands on the electronic properties of the cofactor.
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Affiliation(s)
- Giuseppe Zampella
- Department of Biotechnology and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy
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96
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Maity D, Ray A, Sheldrick W, Figge HM, Bandyopadhyay B, Ali M. Synthesis and crystal structure of a salicylatooxovanadium(V) complex of an aminebis(phenolate) ligand: Kinetic studies on its formation from corresponding alkoxo complexes. Inorganica Chim Acta 2006. [DOI: 10.1016/j.ica.2006.03.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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97
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Maurya MR, Kumar A, Ebel M, Rehder D. Synthesis, Characterization, Reactivity, and Catalytic Potential of Model Vanadium(IV, V) Complexes with Benzimidazole-Derived ONN Donor Ligands. Inorg Chem 2006; 45:5924-37. [PMID: 16841997 DOI: 10.1021/ic0604922] [Citation(s) in RCA: 120] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Reaction between [VO(acac)(2)] and the ONN donor Schiff base Hsal-ambmz (I) (Hsal-ambmz = Schiff base obtained by the condensation of salicylaldehyde and 2-aminomethylbenzimidazole) resulted in the formation of the complexes [V(IV)O(acac)(sal-ambmz)] (1), [V(V)O(2)(acac-ambmz)] (2) (Hacac-ambmz = Schiff base derived from acetylacetone and 2-aminomethylbenzimidazole), and the known complex [V(IV)O(sal-phen)] (3) (H(2)sal-phen = Schiff base derived from salicylaldehyde and o-phenylenediamine). Similarly, [V(IV)O(acac)(sal-aebmz)] (7) has been isolated from the reaction with Hsal-aebmz (II) (Hsal-aebmz derived from salicylaldehyde and 2-aminoethylbenzimidazole). Aerial oxidation of the methanolic solutions/suspensions of 1 and 7 yielded the dioxovanadium(V) complexes [V(V)O(2)(sal-ambmz)] (4) and [V(V)O(2)(sal-aebmz)] (8), respectively. Reaction of VOSO(4) with II gave [{V(IV)O(sal-aebmz)}(2)SO(4)] (9) and [V(IV)O(sal-aebmz)(2)] (10), along with 3 and 8. Under similar reaction conditions, I gave only [{V(IV)O(sal-ambmz)}(2)SO(4)] (5) and 3 as major products. Treatment of 1 and 7 with benzohydroxamic acid (Hbha) yielded the mixed-chelate complexes [V(V)O(bha)(sal-ambmz)] (6) and [V(V)O(bha)(sal-aebmz)] (11). The crystal and molecular structures of 2, 3.1/2DMF, 7.1/4H(2)O, 8, 9.2H(2)O, 10, and 11 have been determined, confirming the ONN binding mode of the ligands. In complex 10, one of the ligands is coordinated through the azomethine nitrogen and phenolate oxygen only, leaving the benzimidazole group free. In the dinuclear complex 9, bridging functions are the phenolate oxygens from both of the ligands and two oxygens of the sulfato group. The unstable oxoperoxovanadium(V) complex [V(V)O(O(2))(sal-aebmz)] (12) has been prepared by treatment of 7 with aqueous H(2)O(2). Acidification of methanolic solutions of 7 and 10 lead to (reversible) protonation of the bemzimidazole, while 8 was converted to an oxo-hydroxo species. Complexes 2, 4, and 8 catalyze the oxidation of methyl phenyl sulfide to methyl phenyl sulfoxide and methyl phenyl sulfone, a reaction mimicking the sulfideperoxidase activity of vanadate-dependent haloperoxidases. These complexes are also catalytically active in the oxidation of styrene to styrene oxide, benzaldehyde, benzoic acid, and 1-phenylethane-1,2-diol.
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Affiliation(s)
- Mannar R Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247 667, India.
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98
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Affiliation(s)
- Bradley S Moore
- Scripps Institution of Oceanography and Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, La Jolla, CA 92093, USA
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99
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Maurya MR, Agarwal S, Abid M, Azam A, Bader C, Ebel M, Rehder D. Synthesis, characterisation, reactivity and in vitro antiamoebic activity of hydrazone based oxovanadium(iv), oxovanadium(v) and µ-bis(oxo)bis{oxovanadium(v)} complexes. Dalton Trans 2006:937-47. [PMID: 16462954 DOI: 10.1039/b512326g] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Binuclear, mu-bis(oxo)bis{oxovanadium(V)} complexes [(VOL)2(mu-O)2](2 and 7)(where HL are the hydrazones Hacpy-nah I or Hacpy-fah II; acpy = 2-acetylpyridine, nah = nicotinic acid hydrazide and fah = 2-furoic acid hydrazide) were prepared by the reaction of [VO(acac)2] and the ligands in methanol followed by aerial oxidation. The paramagnetic intermediate complexes [VO(acac)(acpy-nah)](1) and [VO(acac)(acpy-fah)](6) have also been isolated. Treatment of [VO(acac)(acpy-nah)] and [VO(acac)(acpy-fah)] with aqueous H2O2 yields the oxoperoxovanadium(V) complexes [VO(O2)(acpy-nah)](3) and [VO(O2)(acpy-fah)](8). In the presence of catechol (H2cat) or benzohydroxamic acid (H2bha), 1 and 6 give the mixed chelate complexes [VO(cat)L](HL =I: 4, HL =II: 9) or [VO(bha)L](HL =I: 5, HL =II: 10). Complexes 4, 5, 9 and 10 slowly convert to the corresponding oxo-mu-oxo species 2 and 7 in DMF solution. Ascorbic acid enhances this conversion under aerobic conditions, possibly through reduction of these complexes with concomitant removal of coordinated catecholate or benzohydroxamate. Acidification of 7 with HCl dissolved in methanol afforded a hydroxo(oxo) complex. The crystal and molecular structure of 2.1.5H2O has been determined, and the structure of 7 re-determined, by single crystal X-ray diffraction. Both of these binuclear complexes contain the uncommon asymmetrical {VO(mu-O)}2 diamond core. The in vitro tests of the antiamoebic activity of ligands I and II and their binuclear complexes 2 and 7 against the protozoan parasite Entamoeba histolytica show that the ligands have no amoebicidal activity while their vanadium complexes 2 and 7 display more effective amoebicidal activity than the most commonly used drug metronidazole (IC50 values are 1.68 and 0.45 microM, respectively vs 1.81 microM for metronidazole). Complexes 2 and 7 catalyse the oxidation of styrene and ethyl benzene effectively. Oxidation of styrene, using H2O2 as an oxidant, gives styrene epoxide, 2-phenylacetaldehyde, benzaldehyde, benzoic acid and 1-phenyl-ethane-1,2-diol, while ethyl benzene yields benzyl alcohol, benzaldehyde and 1-phenyl-ethane-1,2-diol.
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Affiliation(s)
- Mannar R Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, 247 667, India.
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Maurya MR, Kumar U, Manikandan P. Polymer supported vanadium and molybdenum complexes as potential catalysts for the oxidation and oxidative bromination of organic substrates. Dalton Trans 2006:3561-75. [PMID: 16855757 DOI: 10.1039/b600822d] [Citation(s) in RCA: 96] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Schiff base (H2fsal-ohyba) derived from 3-formylsalicylic acid and o-hydroxybenzylamine has been covalently bonded to chloromethylated polystyrene cross-linked with 5% divinylbenzene (abbreviated as PS-H(2)fsal-ohyba, I). Treatment of [VO(acac)2] with PS-H2fsal-ohyba in dimethylformamide (DMF) gave the oxovanadium(iv) complex PS-[VO(fsal-ohyba).DMF] (1). Complex 1 can be oxidized into the dioxovanadium(v) species, PS-K[VO2(fsal-ohyba)] (2) on aerial oxidation in the presence of KOH or into the oxoperoxo species, PS-K[VO(O2)(fsal-ohyba)] (3) in the presence of H2O2 and KOH in DMF suspension. Similarly, PS-[MoO(2)(fsal-ohyba).DMF] (4) has been isolated by the reaction of [MoO2(acac)2] with PS-H2fsal-ohyba. All these complexes have been characterised by various techniques. These complexes catalyse the oxidation of styrene, ethylbenzene and phenol efficiently. Styrene gives five reaction products namely styrene oxide, benzaldehyde, 1-phenylethane-1,2-diol, benzoic acid and phenylacetaldehyde, while ethylbenzene gives benzaldehyde, phenyl acetic acid, styrene and 1-phenylethane-1,2-diol. The oxidation products of phenol are catechol and p-hydroquinone. These catalysts are also able to catalyse the oxidative bromination of salicylaldehyde to 5-bromosalicylaldehyde with ca. 80% selectively in the presence of aqueous 30% H2O2/KBr, a reaction similar to that exhibited by vanadate-dependent haloperoxidases. Their corresponding neat complexes have also been prepared and their catalytic activities have been compared.
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Affiliation(s)
- Mannar R Maurya
- Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee 247667, India.
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