1
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Panza N, di Biase A, Caselli A. Structural and spectroscopical characterization of µ-oxo bridged Iron(III) bromide complexes of Pyclen ligands. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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2
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Shapterhasmi T, Palani N, Velusamy M, Bhuvanesh NS, Sundaravel K, Easwaramoorthi S. Iron(III) Complexes of Pyrrolidine and Piperidine Appended Tridentate 3N Donor Ligands as Models for Catechol Dioxygenase Enzymes. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.120924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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3
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Biological Inspirations: Iron Complexes Mimicking the Catechol Dioxygenases. MATERIALS 2021; 14:ma14123250. [PMID: 34204660 PMCID: PMC8231159 DOI: 10.3390/ma14123250] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 06/07/2021] [Accepted: 06/09/2021] [Indexed: 11/18/2022]
Abstract
Within the broad group of Fe non-heme oxidases, our attention was focused on the catechol 1,2- and 2,3-dioxygenases, which catalyze the oxidative cleavage of aromatic rings. A large group of Fe complexes with N/O ligands, ranging from N3 to N2O2S, was developed to mimic the activity of these enzymes. The Fe complexes discussed in this work can mimic the intradiol/extradiol catechol dioxygenase reaction mechanism. Electronic effects of the substituents in the ligand affect the Lewis acidity of the Fe center, increasing the ability to activate dioxygen and enhancing the catalytic activity of the discussed biomimetic complexes. The ligand architecture, the geometric isomers of the complexes, and the substituent steric effects significantly affect the ability to bind the substrate in a monodentate and bidentate manner. The substrate binding mode determines the preferred mechanism and, consequently, the main conversion products. The preferred mechanism of action can also be affected by the solvents and their ability to form the stable complexes with the Fe center. The electrostatic interactions of micellar media, similar to SDS, also control the intradiol/extradiol mechanisms of the catechol conversion by discussed biomimetics.
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Chowdhury R, Abboud MI, McAllister TE, Banerji B, Bhushan B, Sorensen JL, Kawamura A, Schofield CJ. Use of cyclic peptides to induce crystallization: case study with prolyl hydroxylase domain 2. Sci Rep 2020; 10:21964. [PMID: 33319810 PMCID: PMC7738489 DOI: 10.1038/s41598-020-76307-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Accepted: 10/27/2020] [Indexed: 12/18/2022] Open
Abstract
Crystallization is the bottleneck in macromolecular crystallography; even when a protein crystallises, crystal packing often influences ligand-binding and protein-protein interaction interfaces, which are the key points of interest for functional and drug discovery studies. The human hypoxia-inducible factor prolyl hydroxylase 2 (PHD2) readily crystallises as a homotrimer, but with a sterically blocked active site. We explored strategies aimed at altering PHD2 crystal packing by protein modification and molecules that bind at its active site and elsewhere. Following the observation that, despite weak inhibition/binding in solution, succinamic acid derivatives readily enable PHD2 crystallization, we explored methods to induce crystallization without active site binding. Cyclic peptides obtained via mRNA display bind PHD2 tightly away from the active site. They efficiently enable PHD2 crystallization in different forms, both with/without substrates, apparently by promoting oligomerization involving binding to the C-terminal region. Although our work involves a specific case study, together with those of others, the results suggest that mRNA display-derived cyclic peptides may be useful in challenging protein crystallization cases.
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Affiliation(s)
- Rasheduzzaman Chowdhury
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Martine I Abboud
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Tom E McAllister
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
- Chemistry - School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Biswadip Banerji
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Bhaskar Bhushan
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - John L Sorensen
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Akane Kawamura
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
- Chemistry - School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, UK
| | - Christopher J Schofield
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK.
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Kumar Pal C, Mahato S, Joshi M, Paul S, Roy Choudhury A, Biswas B. Transesterification activity by a zinc(II)-Schiff base complex with theoretical interpretation. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119541] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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6
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Starikova AA, Chegerev MG, Starikov AG. Mononuclear Cobalt and Iron o-Quinone Complexes with Tetradentate N-Donor Bases: Structures and Properties. RUSS J COORD CHEM+ 2020. [DOI: 10.1134/s1070328420030070] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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7
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Mohabeer PK, Carr B, Hanif M, Hartinger C, Groutso T, Jelley RE, Söhnel T, Blackman AG. Synthesis, structure and fluxionality of Co(III) complexes containing chelated sulfate. Polyhedron 2020. [DOI: 10.1016/j.poly.2019.114303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Pal CK, Mahato S, Yadav HR, Shit M, Choudhury AR, Biswas B. Bio-mimetic of catecholase and phosphatase activity by a tetra-iron(III) cluster. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.114156] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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9
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Garai M, Das A, Joshi M, Paul S, Shit M, Choudhury AR, Biswas B. Synthesis and spectroscopic characterization of a photo-stable tetrazinc(II)–Schiff base cluster: A rare case of ligand centric phenoxazinone synthase activity. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.09.044] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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10
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Das S, Sahu A, Joshi M, Paul S, Shit M, Roy Choudhury A, Biswas B. Ligand-Centered Radical Activity by a Zinc-Schiff-Base Complex towards Catechol Oxidation. ChemistrySelect 2018. [DOI: 10.1002/slct.201801084] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Subrata Das
- Department of Chemistry; University of North Bengal; Darjeeling 734013, West Bengal India
| | - Amrita Sahu
- Department of Electrical Engineering; Temple University; Philadelphia 741235 USA
| | - Mayank Joshi
- Department of Chemical Sciences; Indian Institute of Science Education and Research Mohali, S.A.S. Nagar, Manauli PO; Mohali 140 306 India
| | - Suvendu Paul
- Department of Chemistry; University of Kalyani, Kalyani; 741235, West Bengal India
| | - Madhusudan Shit
- Department of Chemistry; Dinobandhu Andrews College; Kolkata 700084,West Bengal India
| | - Angshuman Roy Choudhury
- Department of Chemical Sciences; Indian Institute of Science Education and Research Mohali, S.A.S. Nagar, Manauli PO; Mohali 140 306 India
| | - Bhaskar Biswas
- Department of Chemistry; University of North Bengal; Darjeeling 734013, West Bengal India
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11
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Tyagi N, Singh O, Ghosh K. Non-heme iron(III) complex with tridentate ligand: Synthesis, structures and catalytic oxidations of alkanes. CATAL COMMUN 2017. [DOI: 10.1016/j.catcom.2017.02.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
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12
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Dey D, De A, Yadav HR, Guin PS, Choudhury AR, Kole N, Biswas B. An Oxido-Bridged Diiron(II) Complex as Functional Model of Catechol Dioxygenase. ChemistrySelect 2016. [DOI: 10.1002/slct.201600575] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dhananjay Dey
- Department of Chemistry; Raghunathpur College; Purulia 723 133,West Bengal India
| | - Abhranil De
- Department of Chemistry; Raghunathpur College; Purulia 723 133,West Bengal India
| | - Hare Ram Yadav
- Department of Chemical Sciences; Indian Institute of Science Education and Research Mohali; S.A.S. Nagar, Manauli PO Mohali 140 306 India
| | | | - Angshuman Roy Choudhury
- Department of Chemical Sciences; Indian Institute of Science Education and Research Mohali; S.A.S. Nagar, Manauli PO Mohali 140 306 India
| | - Niranjan Kole
- Department of Chemistry; Raghunathpur College; Purulia 723 133,West Bengal India
| | - Bhaskar Biswas
- Department of Chemistry; Raghunathpur College; Purulia 723 133,West Bengal India
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Safaei E, Heidari S, Wojtczak A, Cotič P, Kozakiewicz A. 4-Nitrocatecholato iron(III) complexes of 2-aminomethyl pyridine-based bis(phenol) amine as structural models for catechol-bound 3,4-PCD. J Mol Struct 2016. [DOI: 10.1016/j.molstruc.2015.10.038] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Balamurugan M, Vadivelu P, Palaniandavar M. Iron(iii) complexes of tripodal tetradentate 4N ligands as functional models for catechol dioxygenases: the electronic vs. steric effect on extradiol cleavage. Dalton Trans 2014; 43:14653-68. [DOI: 10.1039/c3dt52145a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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15
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Models for enzyme–substrate adduct of non-heme iron-containing enzymes, synthesis and characterization. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2013.06.023] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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16
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Whiteoak CJ, Nobbs JD, Kiryushchenkov E, Pagano S, White AJP, Britovsek GJP. Tri(pyridylmethyl)phosphine: the elusive congener of TPA shows surprisingly different coordination behavior. Inorg Chem 2013; 52:7000-9. [PMID: 23701515 DOI: 10.1021/ic4005196] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Tri(pyridylmethyl)phosphine (TPPh), the remarkably elusive congener of tri(pyridylmethyl)amine (TPA), has been prepared, as well as the relative tri(N-methyl-pyridylamino)phosphine (TPAMP). The coordination properties of these new ligands have been evaluated for chromium(III), iron(II), and ruthenium(II) complexes and compared with the related TPA complexes. In all cases, a different coordination behavior has been observed whereby TPPh and TPAMP always act as tridentate ligands. A chromium(III) complex [Cr(TPPh)Cl3] has been prepared, which has shown low ethylene oligomerization activity. Octahedral low spin iron(II) complexes [Fe(TPPh)2](2+) and [Fe(TPAMP)2](2+) were obtained with two ligands bound to the metal center. Ruthenium(II) chloro complexes of TPA and TPPh undergo ligand exchange reactions in acetonitrile, and the ruthenium(II) complex [Ru(MeCN)2(TPA)](2+) can be oxidized by m-CPBA in acetonitrile to give a transient ruthenium(IV) oxo complex [Ru(O)(MeCN)(TPA)](2+). Attempts to generate high valent ruthenium(IV) oxo TPPh or TPAMP complexes could not be achieved, probably due to insufficient stabilization by these strong field ligands.
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Affiliation(s)
- Christopher J Whiteoak
- Department of Chemistry, Imperial College London, Exhibition Road, London SW7 2AY, United Kingdom
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Karimpour T, Safaei E, Wojtczak A, Jagličić Z, Kozakiewicz A. Iron(III) complexes of ethylenediamine derivatives of aminophenol ligands as models for enzyme–substrate adducts of catechol dioxygenases. Inorganica Chim Acta 2013. [DOI: 10.1016/j.ica.2012.10.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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18
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Oxygenolysis reaction mechanism of copper-dependent quercetin 2,3-dioxygenase: A density functional theory study. Sci China Chem 2012. [DOI: 10.1007/s11426-012-4729-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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19
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Maithufi N, Otto S. The bis(acetonitrile-κN)bis[N,N-bis(diphenylphosphanyl)ethanamine-κ2P,P']iron(II) tetrabromidoferrate(II) and μ-oxido-bis[tribromidoferrate(III)] complex salts. Acta Crystallogr C 2011; 67:m279-83. [PMID: 21817789 DOI: 10.1107/s0108270111026758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2011] [Accepted: 07/05/2011] [Indexed: 11/10/2022] Open
Abstract
Orange crystals of bis(acetonitrile-κN)bis[N,N-bis(diphenylphosphanyl)ethanamine-κ(2)P,P']iron(II) tetrabromidoferrate(II), [Fe(CH(3)CN)(2)(C(26)H(25)NP(2))(2)][FeBr(4)], (I), and red crystals of bis(acetonitrile-κN)bis[N,N-bis(diphenylphosphanyl)ethanamine-κ(2)P,P']iron(II) μ-oxido-bis[tribromidoferrate(III)], [Fe(CH(3)CN)(2)(C(26)H(25)NP(2))(2)][Fe(2)Br(6)O], (II), were obtained from the same solution after prolonged exposure to atmospheric oxygen, resulting in partial oxidation of the [FeBr(4)](2-) anion to the [Br(3)FeOFeBr(3)](2-) anion. The asymmetric unit of (I) consists of three independent cations, one on a general position and two on inversion centres, with two anions, required to balance the charge, located on general positions. The asymmetric unit of (II) consists of two independent cations and two anions, all on special positions. The geometric parameters within the coordination environments of the cations do not differ significantly, with the major differences being in the orientation of the phenyl rings on the bidentate phosphane ligand. The ethyl substituent in the cation of (II) and the Br atoms in the anions of (II) are disordered. The P-Fe-P bite angles represent the smallest angles reported to date for octahedral Fe(II) complexes containing bidentate phosphine ligands with MeCN in the axial positions, ranging from 70.82 (3) to 70.98 (4)°. The average Fe-Br bond distances of 2.46 (2) and 2.36 (2) Å in the [FeBr(4)](2-) and [Br(3)FeOFeBr(3)](2-) anions, respectively, illustrate the differences in the Fe oxidation states.
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Affiliation(s)
- Norah Maithufi
- Sasol Technology Research and Development, Department of Chemistry, Sasolburg, South Africa
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20
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Nakatani N, Hitomi Y, Sakaki S. Multistate CASPT2 Study of Native Iron(III)-Dependent Catechol Dioxygenase and Its Functional Models: Electronic Structure and Ligand-to-Metal Charge-Transfer Excitation. J Phys Chem B 2011; 115:4781-9. [DOI: 10.1021/jp110045f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Naoki Nakatani
- Department of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan
| | - Yutaka Hitomi
- Department of Molecular Chemistry and Biochemistry, Faculty of Science and Engineering, Doshisha University, Kyotanabe, Kyoto 610-0321, Japan
| | - Shigeyoshi Sakaki
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan
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21
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Anitha N, Palaniandavar M. Mononuclear iron(iii) complexes of 3N ligands in organized assemblies: spectral and redox properties and attainment of regioselective extradiol dioxygenase activity. Dalton Trans 2011; 40:1888-901. [DOI: 10.1039/c0dt01012j] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Sundaravel K, Sankaralingam M, Suresh E, Palaniandavar M. Biomimetic iron(iii) complexes of N3O and N3O2 donor ligands: protonation of coordinated ethanolate donor enhances dioxygenase activity. Dalton Trans 2011; 40:8444-58. [PMID: 21785763 DOI: 10.1039/c1dt10495k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Karuppasamy Sundaravel
- Centre for Bioinorganic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli, 620 024, India
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Sundaravel K, Suresh E, Saminathan K, Palaniandavar M. Iron(III) complexes of N2O and N3O donor ligands as functional models for catechol dioxygenase enzymes: ether oxygen coordination tunes the regioselectivity and reactivity. Dalton Trans 2011; 40:8092-107. [DOI: 10.1039/c0dt01598a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Karuppasamy Sundaravel
- Centre for Bioinorganic Chemistry, School of Chemistry, Bharathidasan University, Tiruchirappalli, 620 024, Tamilnadu, India
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24
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Singh R, Banerjee A, Rajak KK. Iron(III) complexes using NNS reduced Schiff bases and NNOS coordinating tetradentate ligands: Synthesis, structure and catecholase activity. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.05.027] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Sundaravel K, Suresh E, Palaniandavar M. Iron(III) complexes of tridentate N3 ligands as models for catechol dioxygenases: Stereoelectronic effects of pyrazole coordination. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.04.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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26
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Mayilmurugan R, Sankaralingam M, Suresh E, Palaniandavar M. Novel square pyramidal iron(iii) complexes of linear tetradentate bis(phenolate) ligands as structural and reactive models for intradiol-cleaving 3,4-PCD enzymes: Quinone formation vs. intradiol cleavage. Dalton Trans 2010; 39:9611-25. [DOI: 10.1039/c0dt00171f] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Functional model for catecholase-like activity: Synthesis, structure, spectra, and catalytic activity of iron(III) complexes with substituted-salicylaldimine ligands. Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2009.06.038] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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28
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Mayilmurugan R, Visvaganesan K, Suresh E, Palaniandavar M. Iron(III) Complexes of Tripodal Monophenolate Ligands as Models for Non-Heme Catechol Dioxygenase Enzymes: Correlation of Dioxygenase Activity with Ligand Stereoelectronic Properties. Inorg Chem 2009; 48:8771-83. [DOI: 10.1021/ic900969n] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | - Eringathodi Suresh
- Analytical Science Discipline, Central Salt and Marine Chemicals Research Institute, Bhavnagar − 364 002, India
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Matouzenko GS, Borshch SA, Jeanneau E, Bushuev MB. Spin Crossover in a Family of Iron(II) Complexes with Hexadentate ligands: Ligand Strain as a Factor Determining the Transition Temperature. Chemistry 2008; 15:1252-60. [DOI: 10.1002/chem.200801852] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Panda MK, John A, Shaikh MM, Ghosh P. Mimicking the Intradiol Catechol Cleavage Activity of Catechol Dioxygenase by High-Spin Iron(III) Complexes of a New Class of a Facially Bound [N2O] Ligand. Inorg Chem 2008; 47:11847-56. [DOI: 10.1021/ic801576f] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Manas K. Panda
- Department of Chemistry and National Single Crystal X-ray Diffraction Facility, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Alex John
- Department of Chemistry and National Single Crystal X-ray Diffraction Facility, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Mobin M. Shaikh
- Department of Chemistry and National Single Crystal X-ray Diffraction Facility, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Prasenjit Ghosh
- Department of Chemistry and National Single Crystal X-ray Diffraction Facility, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
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31
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Mayilmurugan R, Stoeckli-Evans H, Palaniandavar M. Novel Iron(III) Complexes of Sterically Hindered 4N Ligands: Regioselectivity in Biomimetic Extradiol Cleavage of Catechols. Inorg Chem 2008; 47:6645-58. [DOI: 10.1021/ic702410d] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ramasamy Mayilmurugan
- School of Chemistry, Bharathidasan University, Tiruchirapalli 620 024, India, and Department of Chemistry, University of Neuchatel, Neuchatel, Switzerland
| | - Helen Stoeckli-Evans
- School of Chemistry, Bharathidasan University, Tiruchirapalli 620 024, India, and Department of Chemistry, University of Neuchatel, Neuchatel, Switzerland
| | - Mallayan Palaniandavar
- School of Chemistry, Bharathidasan University, Tiruchirapalli 620 024, India, and Department of Chemistry, University of Neuchatel, Neuchatel, Switzerland
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32
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Blackman AG. Tripodal Tetraamine Ligands Containing Three Pyridine Units: The
other
Polypyridyl Ligands. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200800115] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Allan G. Blackman
- Department of Chemistry, University of Otago, P. O. Box 56, Dunedin, New Zealand, Fax: +64‐3‐479‐7906
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Sundaravel K, Dhanalakshmi T, Suresh E, Palaniandavar M. Synthesis, structure, spectra and reactivity of iron(iii) complexes of facially coordinating and sterically hindering 3N ligands as models for catechol dioxygenases. Dalton Trans 2008:7012-25. [DOI: 10.1039/b809142k] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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34
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Li F, Wang M, Li P, Zhang T, Sun L. Iron(III) Complexes with a Tripodal N3O Ligand Containing an Internal Base as a Model for Catechol Intradiol-Cleaving Dioxygenases. Inorg Chem 2007; 46:9364-71. [DOI: 10.1021/ic700664u] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fei Li
- State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116012, China, and Organic Chemistry, KTH Chemical Science and Engineering, Stockholm 10044, Sweden
| | - Mei Wang
- State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116012, China, and Organic Chemistry, KTH Chemical Science and Engineering, Stockholm 10044, Sweden
| | - Ping Li
- State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116012, China, and Organic Chemistry, KTH Chemical Science and Engineering, Stockholm 10044, Sweden
| | - Tingting Zhang
- State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116012, China, and Organic Chemistry, KTH Chemical Science and Engineering, Stockholm 10044, Sweden
| | - Licheng Sun
- State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Center on Molecular Devices, Dalian University of Technology (DUT), Dalian 116012, China, and Organic Chemistry, KTH Chemical Science and Engineering, Stockholm 10044, Sweden
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Bruijnincx PCA, Lutz M, Spek AL, Hagen WR, van Koten G, Gebbink RJMK. Iron(III)-catecholato complexes as structural and functional models of the intradiol-cleaving catechol dioxygenases. Inorg Chem 2007; 46:8391-402. [PMID: 17722878 DOI: 10.1021/ic700741v] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The structural and spectroscopic characterization of mononuclear iron(III)-catecholato complexes of ligand L4 (methyl bis(1-methylimidazol-2-yl)(2-hydroxyphenyl)methyl ether, HL4) are described, which closely mimic the enzyme-substrate complex of the intradiol-cleaving catechol dioxygenases. The tridentate, tripodal monoanionic ligand framework of L4 incorporates one phenolato and two imidazole donor groups and thus well reproduces the His2Tyr endogenous donor set. In fact, regarding the structural features of [FeIII(L4)(tcc)(H2O)] (5.H2O, tcc = tetrachlorocatechol) in the solid state, the complex constitutes the closest structural model reported to date. The iron(III)-catecholato complexes mimic both the structural features of the active site and its spectroscopic characteristics. As part of its spectroscopic characterization, the electron paramagnetic resonance (EPR) spectra were successfully simulated using a simple model that accounts for D strain. The simulation procedure showed that the observed g = 4.3 line is an intrinsic part of the EPR envelope of the studied complexes and should not necessarily be attributed to a highly rhombic impurity. [FeIII(L4)(dtbc)(H2O)] (dtbc = 3,5-di-tert-butylcatechol) was studied with respect to its dioxygen reactivity, and oxidative cleavage of the substrate was observed. Intradiol- and extradiol-type cleavage products were found in roughly equal amounts. This shows that an accurate structural model of the first-coordination sphere of the active site is not sufficient for obtaining regioselectivity.
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Affiliation(s)
- Pieter C A Bruijnincx
- Chemical Biology & Organic Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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Mayilmurugan R, Suresh E, Palaniandavar M. A New Tripodal Iron(III) Monophenolate Complex: Effects of Ligand Basicity, Steric Hindrance, and Solvent on Regioselective Extradiol Cleavage. Inorg Chem 2007; 46:6038-49. [PMID: 17589990 DOI: 10.1021/ic700646m] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The new iron(III) complex [Fe(L3)Cl(2)], where H(L3) is the tripodal monophenolate ligand N,N-dimethyl-N'-(pyrid-2-ylmethyl)-N'-(2-hydroxy-3,5-dimethylbenzyl)ethylenediamine, has been isolated and studied as a structural and functional model for catechol dioxygenase enzymes. The complex possesses a distorted octahedral iron(III) coordination geometry constituted by the phenolate oxygen, pyridine nitrogen and two amine nitrogens of the tetradentate ligand, and two cis-coordinated chloride ions. The Fe-O-C bond angle (134.0 degrees) and Fe-O bond length (1.889 Angstrom) are very close to those (Fe-O-C, 133 degrees and 148 degrees, Fe-O(tyrosinate), 1.81 and 1.91 Angstrom) of protocatechuate 3,4-dioxygenase enzymes. When the complex is treated with AgNO(3), the ligand-to-metal charge transfer (LMCT) band around 650 nm (epsilon, 2390 M(-1) cm(-1)) is red shifted to 665 nm with an increase in absorptivity (epsilon, 2630 M(-1) cm(-1)) and the Fe(III)/Fe(II) redox couple is shifted to a slightly more positive potential (-0.329 to -0.276 V), suggesting an increase in the Lewis acidity of the iron(III) center upon the removal of coordinated chloride ions. Furthermore, when 3,5-di-tert-butylcatechol (H(2)DBC) pretreated with 2 mol of Et(3)N is added to the complex [Fe(L3)Cl(2)] treated with 2 equiv of AgNO(3), two intense catecholate-to-iron(III) LMCT bands (719 nm, epsilon, 3150 M(-1) cm(-1); 494 nm, epsilon, 3510 M(-1) cm(-1)) are observed. Similar observations are made when H(2)DBC pretreated with 2 mol of piperidine is added to [Fe(L3)Cl(2)], suggesting the formation of [Fe(L3)(DBC)] with bidentate coordination of DBC(2-). On the other hand, when H(2)DBC pretreated with 2 mol of Et(3)N is added to [Fe(L3)Cl(2)], only one catecholate-to-iron(III) LMCT band (617 nm; epsilon, 4380 M(-1) cm(-1)) is observed, revealing the formation of [Fe(L3)(HDBC)(Cl)] involving monodentate coordination of the catecholate. The appearance of the DBSQ/H(2)DBC couple for [Fe(L3)(DBC)] at a potential (-0.083 V) more positive than that (-0.125 V) for [Fe(L3)(HDBC)(Cl)] reveals that chelated DBC(2-) in the former is stabilized toward oxidation more than the coordinated HDBC(-). It is remarkable that the complex [Fe(L3)(HDBC)(Cl)] undergoes slow selective extradiol cleavage (17.3%) of H(2)DBC in the presence of O(2), unlike the iron(III)-phenolate complexes known to yield only intradiol products. It is probable that the weakly coordinated (2.310 Angstrom) -NMe(2) group rather than chloride in the substrate-bound complex is displaced, facilitating O(2) attack on the iron(III) center and, hence, the extradiol cleavage. In contrast, when the cleavage reaction was performed in the presence of a stronger base-like piperidine before and after the removal of the coordinated chloride ions, a faster intradiol cleavage was favored over extradiol cleavage, suggesting the importance of the bidentate coordination of the catecholate substrate in facilitating intradiol cleavage. Also, intradiol cleavage is favored in dimethylformamide and acetonitrile solvents, with enhanced intradiol cleavage yields of 94 and 40%, respectively.
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Functional model for intradiol-cleaving catechol 1,2-dioxygenase: Synthesis, structure, spectra, and catalytic activity of iron(III) complexes with substituted salicylaldimine ligands. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2007.02.034] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bruijnincx PCA, Lutz M, Spek AL, Hagen WR, Weckhuysen BM, van Koten G, Gebbink RJMK. Modeling the 2-His-1-Carboxylate Facial Triad: Iron−Catecholato Complexes as Structural and Functional Models of the Extradiol Cleaving Dioxygenases. J Am Chem Soc 2007; 129:2275-86. [PMID: 17266307 DOI: 10.1021/ja064816x] [Citation(s) in RCA: 83] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Mononuclear iron(II)- and iron(III)-catecholato complexes with three members of a new 3,3-bis(1-alkylimidazol-2-yl)propionate ligand family have been synthesized as models of the active sites of the extradiol cleaving catechol dioxygenases. These enzymes are part of the superfamily of dioxygen-activating mononuclear non-heme iron enzymes that feature the so-called 2-His-1-carboxylate facial triad. The tridentate, tripodal, and monoanionic ligands used in this study include the biologically relevant carboxylate and imidazole donor groups. The structure of the mononuclear iron(III)-tetrachlorocatecholato complex [Fe(L3)(tcc)(H2O)] was determined by single-crystal X-ray diffraction, which shows a facial N,N,O capping mode of the ligand. For the first time, a mononuclear iron complex has been synthesized, which is facially capped by a ligand offering a tridentate Nim,Nim,Ocarb donor set, identical to the endogenous ligands of the 2-His-1-carboxylate facial triad. The iron complexes are five-coordinate in noncoordinating media, and the vacant coordination site is accessible for Lewis bases, e.g., pyridine, or small molecules such as dioxygen. The iron(II)-catecholato complexes react with dioxygen in two steps. In the first reaction the iron(II)-catecholato complexes rapidly convert to the corresponding iron(III) complexes, which then, in a second slow reaction, exhibit both oxidative cleavage and auto-oxidation of the substrate. Extradiol and intradiol cleavage are observed in noncoordinating solvents. The addition of a proton donor results in an increase in extradiol cleavage. The complexes add a new example to the small group of synthetic iron complexes capable of eliciting extradiol-type cleavage and provide more insight into the factors determining the regioselectivity of the enzymes.
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Affiliation(s)
- Pieter C A Bruijnincx
- Organic Chemistry and Catalysis Group, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands
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Kurahashi T, Oda K, Sugimoto M, Ogura T, Fujii H. Trigonal-Bipyramidal Geometry Induced by an External Water Ligand in a Sterically Hindered Iron Salen Complex, Related to the Active Site of Protocatechuate 3,4-Dioxygenase. Inorg Chem 2006; 45:7709-21. [PMID: 16961363 DOI: 10.1021/ic060650p] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A unique distorted trigonal-bipyramidal geometry observed for the non-heme iron center in protocatechuate 3,4-dioxygenase (3,4-PCD) was carefully examined utilizing a sterically hindered iron salen complex, which well reproduces the endogenous His2Tyr2 donor set with water as an external ligand. X-ray crystal structures of a series of iron model complexes containing bis(3,5-dimesitylsalicylidene)-1,2-dimesitylethylenediamine indicate that a distorted trigonal-bipyramidal geometry is achieved upon binding of water as an external ligand. The extent of a structural change of the iron center from a preferred square-pyramidal to a distorted trigonal-bipyramidal geometry varies with the external ligand that is bound in the order Cl << EtO < H2O, which is consistent with the spectrochemical series. The distortion in the model system is not due to steric repulsions but electronic interactions between the external ligand and the iron center, as evidenced from the X-ray crystal structures of another series of iron model complexes with a less-hindered bis(3-xylylsalicylidene)-1,2-dimesitylethylenediamine ligand, as well as by density functional theory calculations. Further spectroscopic investigations indicate that a unique distorted trigonal-bipyramidal geometry is indeed maintained even in solution. The present model study provides a new viewpoint that a unique distorted trigonal-bipyramidal iron site might not be preorganized by a 3,4-PCD protein but could be electronically induced upon the binding of an external hydroxide ligand to the iron(III) center. The structural change induced by the external water ligand is also discussed in relation to the reaction mechanism of 3,4-PCD.
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Affiliation(s)
- Takuya Kurahashi
- Institute for Molecular Science & Okazaki Institute for Integrative Bioscience, National Institutes of Natural Sciences, Myodaiji, Okazaki 444-8787, Japan.
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Xu JY, Astner J, Walter O, Heinemann FW, Schindler S, Merkel M, Krebs B. Iron(III) Complexes with the LigandN′,N′-Bis[(2-pyridyl)methyl]ethylenediamine (uns-penp) and Its Amide DerivativeN-Acetyl-N′,N′-bis[(2-pyridyl)methyl]ethylenediamine (acetyl-uns-penp). Eur J Inorg Chem 2006. [DOI: 10.1002/ejic.200500902] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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