1
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Wang Y, Liu L, Sang K, Wang Y, Zhang C, Dong H, Bai J. An efficient chiral porous catalyst support – Hypercrosslinked amino acid polymer. J Catal 2021. [DOI: 10.1016/j.jcat.2021.10.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Biancalana L, Zanda E, Hadiji M, Zacchini S, Pratesi A, Pampaloni G, Dyson PJ, Marchetti F. Role of the (pseudo)halido ligand in ruthenium(II) p-cymene α-amino acid complexes in speciation, protein reactivity and cytotoxicity. Dalton Trans 2021; 50:15760-15777. [PMID: 34704998 DOI: 10.1039/d1dt03274g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of the dimeric complexes [RuX2(η6-p-cymene)]2 (X = Br, I, SCN) with L-proline (ProH) and trans-4-hydroxy-L-proline (HypH), in methanol in the presence of NaOH, afforded [RuX(κ2N,O-Pro)(η6-p-cymene)] (X = Br, 1b; I, 1c; SCN, 1d) and [RuX(κ2N,O-Hyp)(η6-p-cymene)] (X = Br, 2b; I, 2c; SCN, 2d), respectively. Alternatively, the one-pot, sequential addition of the appropriate α-amino carboxylate and X- salt to [RuCl2(η6-p-cymene)]2 led to [RuX(κ2N,O-Pro)(η6-p-cymene)] (X = N3, 1e; NO2, 1f; CN 1g) and [Ru(N3)(κ2N,O-Hyp)(η6-p-cymene)] (2e). Complexes [Ru(κ3N,O,O'-O2CCH(NH2)(R)O)(η6-p-cymene)] (R = CH2, 3h; R = CHMe, 4h; R = CH2CH2, 5h) were prepared from the reaction of [RuCl2(η6-p-cymene)]2 with the appropriate α-amino acid and NaOH in refluxing isopropanol. Treatment of the L-serine (SerH2) derivative [RuCl(κ2N,O-SerH)(η6-p-cymene)] (3a) with 1,3,5-triaza-7-phosphaadamantane (PTA) in water at reflux produced [Ru(κ2N,O-Ser)(κP-PTA)(η6-p-cymene)]Cl ([3i]Cl). The products were isolated in good to excellent yields, and were characterized by elemental analysis, IR and multinuclear NMR spectroscopy. The structures of 1f and 2b-e were ascertained by X-ray diffraction studies. The behaviour of the complexes in water and cell culture medium was investigated by multinuclear NMR and UV-Vis spectroscopy, revealing a considerable influence of the monodentate ligand on the aqueous chemistry. Complexes 1d-e, 2d-e, 3h, 4h and [3i]Cl, showing substantial inertness in aqueous media, were assessed for their cytotoxicity towards A2780 and A2780cisR cancer cell lines and the noncancerous HEK 293T cell line. A selection of compounds was also investigated for Ru uptake in A2780 cells and interactions with cytochrome c as a model protein. Combined, these studies provide insights into the previously debated role of the 'leaving' ligand on the biological activity of Ru(II) arene α-amino acid complexes.
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Affiliation(s)
- Lorenzo Biancalana
- University of Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
| | - Emanuele Zanda
- University of Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
| | - Mouna Hadiji
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
| | - Stefano Zacchini
- University of Bologna, Dipartimento di Chimica Industriale "Toso Montanari", Viale Risorgimento 4, I-40136 Bologna, Italy
| | - Alessandro Pratesi
- University of Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
| | - Guido Pampaloni
- University of Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
| | - Paul J Dyson
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), Switzerland
| | - Fabio Marchetti
- University of Pisa, Dipartimento di Chimica e Chimica Industriale, Via G. Moruzzi 13, I-56124 Pisa, Italy.
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3
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Infante-Tadeo S, Rodríguez-Fanjul V, Habtemariam A, Pizarro AM. Osmium(ii) tethered half-sandwich complexes: pH-dependent aqueous speciation and transfer hydrogenation in cells. Chem Sci 2021; 12:9287-9297. [PMID: 34349898 PMCID: PMC8278929 DOI: 10.1039/d1sc01939b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Accepted: 06/09/2021] [Indexed: 02/04/2023] Open
Abstract
Aquation is often acknowledged as a necessary step for metallodrug activity inside the cell. Hemilabile ligands can be used for reversible metallodrug activation. We report a new family of osmium(ii) arene complexes of formula [Os(η6-C6H5(CH2)3OH)(XY)Cl]+/0 (1-13) bearing the hemilabile η6-bound arene 3-phenylpropanol, where XY is a neutral N,N or an anionic N,O- bidentate chelating ligand. Os-Cl bond cleavage in water leads to the formation of the hydroxido/aqua adduct, Os-OH(H). In spite of being considered inert, the hydroxido adduct unexpectedly triggers rapid tether ring formation by attachment of the pendant alcohol-oxygen to the osmium centre, resulting in the alkoxy tethered complex [Os(η6-arene-O-κ1)(XY)] n+. Complexes 1C-13C of formula [Os(η6:κ1-C6H5(CH2)3OH/O)(XY)]+ are fully characterised, including the X-ray structure of cation 3C. Tether-ring formation is reversible and pH dependent. Osmium complexes bearing picolinate N,O-chelates (9-12) catalyse the hydrogenation of pyruvate to lactate. Intracellular lactate production upon co-incubation of complex 11 (XY = 4-Me-picolinate) with formate has been quantified inside MDA-MB-231 and MCF7 breast cancer cells. The tether Os-arene complexes presented here can be exploited for the intracellular conversion of metabolites that are essential in the intricate metabolism of the cancer cell.
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Affiliation(s)
| | | | - Abraha Habtemariam
- IMDEA Nanociencia Faraday 9 28049 Madrid Spain
- Department of Chemistry, University of Warwick Gibbet Hill Road Coventry CV4 7AL UK
| | - Ana M Pizarro
- IMDEA Nanociencia Faraday 9 28049 Madrid Spain
- Unidad Asociada de Nanobiotecnología CNB-CSIC-IMDEA 28049 Madrid Spain
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4
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Hassoon AA, Szorcsik A, Bogár F, Papp IZ, Fülöp L, Kele Z, Gajda T. The interaction of half-sandwich (η 5-Cp*)Rh(III) cation with histidine containing peptides and their ternary species with (N,N) bidentate ligands. J Inorg Biochem 2020; 216:111330. [PMID: 33360738 DOI: 10.1016/j.jinorgbio.2020.111330] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 11/23/2020] [Accepted: 12/01/2020] [Indexed: 12/28/2022]
Abstract
Our goal was to explore the possible interactions of the potential metallodrug (η5-Cp*)Rh(III) complexes with histidine containing biomolecules (peptides/proteins) in order to understand the most important thermodynamic factors influencing the biospeciation and biotransformation of (η5-Cp*)Rh(III) complexes. To this end, here we report systematic solution thermodynamic and solution structural study on the interaction of (η5-Cp*)Rh(III) cation with histidine containing peptides and their constituents ((N-methyl)imidazole, GGA-OH, GGH-OH, histidine-amide, HGG-OH, GHG-NH2), based on extensive 1H NMR, ESI-MS and potentiometric investigations. The comparative evaluation of our data indicated that (η5-Cp*)Rh(III) cation is able to induce the deprotonation of amide nitrogen well below pH 7. Consequently, at physiological pH the peptides are coordinated to Rh(III) by tridentate manner, with the participation of amide nitrogen. At pH 7.4 the (η5-Cp*)Rh(III) binding affinity of peptides follow the order GGA-OH < < GGH-OH < < histidine-amide < HGG-OH < GHG-NH2, i.e. the observed binding strength essentially depends on the presence and position of histidine within the peptide sequence. We also performed computational study on the possible solution structures of complexes present at near physiological pH. At pH 7.4 all histidine containing peptides form ternary complexes with strongly coordinating (N,N) bidentate ligands (ethylenediamine or bipyridyl), in which the peptides are monodentately coordinated to Rh(III) through their imidazole N1‑nitrogens. In addition, the strongest chelators histidine-amide, HGG-OH and GHG-NH2 are also able to displace these powerful bidentate ligands from the coordination sphere of Rh(III).
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Affiliation(s)
- Azza A Hassoon
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Attila Szorcsik
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary
| | - Ferenc Bogár
- Institute of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary; MTA-SZTE Biomimetic Systems Research Group, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Ibolya Zita Papp
- Institute of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Lívia Fülöp
- Institute of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Zoltán Kele
- Institute of Medical Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Tamás Gajda
- Department of Inorganic and Analytical Chemistry, University of Szeged, Dóm tér 7, H-6720 Szeged, Hungary.
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5
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Biggs GS, Klein OJ, Boss SR, Barker PD. Unlocking the Full Evolutionary Potential of Artificial Metalloenzymes Through Direct Metal-Protein Coordination : A review of recent advances for catalyst development. JOHNSON MATTHEY TECHNOLOGY REVIEW 2020. [DOI: 10.1595/205651320x15928204097766] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Generation of artificial metalloenzymes (ArMs) has gained much inspiration from the general understanding of natural metalloenzymes. Over the last decade, a multitude of methods generating transition metal-protein hybrids have been developed and many of these new-to-nature constructs
catalyse reactions previously reserved for the realm of synthetic chemistry. This perspective will focus on ArMs incorporating 4d and 5d transition metals. It aims to summarise the significant advances made to date and asks whether there are chemical strategies, used in nature to optimise
metal catalysts, that have yet to be fully recognised in the synthetic enzyme world, particularly whether artificial enzymes produced to date fully take advantage of the structural and energetic context provided by the protein. Further, the argument is put forward that, based on precedence,
in the majority of naturally evolved metalloenzymes the direct coordination bonding between the metal and the protein scaffold is integral to catalysis. Therefore, the protein can attenuate metal activity by positioning ligand atoms in the form of amino acids, as well as making non-covalent
contributions to catalysis, through intermolecular interactions that pre-organise substrates and stabilise transition states. This highlights the often neglected but crucial element of natural systems that is the energetic contribution towards activating metal centres through protein fold
energy. Finally, general principles needed for a different approach to the formation of ArMs are set out, utilising direct coordination inspired by the activation of an organometallic cofactor upon protein binding. This methodology, observed in nature, delivers true interdependence between
metal and protein. When combined with the ability to efficiently evolve enzymes, new problems in catalysis could be addressed in a faster and more specific manner than with simpler small molecule catalysts.
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Affiliation(s)
- George S. Biggs
- Department of Chemistry, University of Cambridge Lensfield Road, Cambridge, CB2 1EW UK
| | - Oskar James Klein
- Department of Chemistry, University of Cambridge Lensfield Road, Cambridge, CB2 1EW UK
| | - Sally R. Boss
- Department of Chemistry, University of Cambridge Lensfield Road, Cambridge, CB2 1EW UK
| | - Paul D. Barker
- Department of Chemistry, University of Cambridge Lensfield Road, Cambridge, CB2 1EW UK
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6
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Ji J, Chen C, Jia AQ, Shi HT, Zhang QF. Syntheses, structures and photocatalytic properties of ruthenium complexes bearing L-methionine ligands. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2019.121078] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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7
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Kemp SA, Prior TJ, Savoie H, Boyle RW, Murray BS. The Application of Reversible Intramolecular Sulfonamide Ligation to Modulate Reactivity in Organometallic Ruthenium(II) Diamine Complexes. Molecules 2020; 25:molecules25020244. [PMID: 31936104 PMCID: PMC7024221 DOI: 10.3390/molecules25020244] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2019] [Revised: 12/17/2019] [Accepted: 12/20/2019] [Indexed: 01/17/2023] Open
Abstract
Metallation of biomacromolecular species forms the basis for the anticancer activity of many metallodrugs. A major limitation of these compounds is that their reactivity is indiscriminate and can, in principle, occur in healthy tissue as well as cancerous tissue, potentially leading to side effects in vivo. Here we present pH-dependent intramolecular coordination of an arene-tethered sulfonamide functionality in organometallic ruthenium(II) ethylenediamine complexes as a route to controlling the coordination environment about the central metal atom. Through variation of the sulfonamide R group and the length of the tether linking it to the arene ligand the acidity of the sulfonamide NH group, and hence the pH-region over which regulation of metal coordination occurs, can be modulated. Intramolecular sulfonamide ligation controlled the reactivity of complex 4 within the physiologically relevant pH-region, rendering it more reactive towards 5ʹ-GMP in mildly acidic pH-conditions typical of tumour tissue compared to the mildly alkaline pH-conditions typical of healthy tissue. However, the activation of 4 by ring-opening of the chelate was found to be a slow process relative to the timescale of typical cell culture assays and members of this series of complexes were found not to be cytotoxic towards the HT-29 cell line. These complexes provide the basis for the development of analogues of increased potency where intramolecular sulfonamide ligation regulates reactivity and therefore cytotoxicity in a pH-dependent, and potentially, tissue-dependent manner.
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8
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Pernar M, Kokan Z, Kralj J, Glasovac Z, Tumir LM, Piantanida I, Eljuga D, Turel I, Brozovic A, Kirin SI. Organometallic ruthenium(II)-arene complexes with triphenylphosphine amino acid bioconjugates: Synthesis, characterization and biological properties. Bioorg Chem 2019; 87:432-446. [DOI: 10.1016/j.bioorg.2019.03.048] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2018] [Revised: 03/05/2019] [Accepted: 03/15/2019] [Indexed: 12/25/2022]
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9
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M'bitsi-Ibouily GC, Marimuthu T, Kumar P, Choonara YE, du Toit LC, Pradeep P, Modi G, Pillay V. Synthesis, Characterisation and In Vitro Permeation, Dissolution and Cytotoxic Evaluation of Ruthenium(II)-Liganded Sulpiride and Amino Alcohol. Sci Rep 2019; 9:4146. [PMID: 30858469 PMCID: PMC6412051 DOI: 10.1038/s41598-019-40538-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Accepted: 02/07/2019] [Indexed: 12/15/2022] Open
Abstract
Sulpiride (SPR) is a selective antagonist of central dopamine receptors but has limited clinical use due to its poor pharmacokinetics. The aim of this study was to investigate how metal ligation to SPR may improve its solubility, intestinal permeability and prolong its half-life. The synthesis and characterisation of ternary metal complexes [Ru(p -cymene)(L)(SPR)]PF6 (L1 = (R)-(+)-2-amino-3-phenyl-1-propanol, L2 = ethanolamine, L3 = (S)-(+)-2-amino-1-propanol, L4 = 3-amino-1-propanol, L5 = (S)-(+)-2-pyrrolidinemethanol) are described in this work. The stability constant of the [Ru(p -cymene)(SPR)] complex was determined using Job's method. The obtained value revealed higher stability of the metal complex in the physiological pH than in an acidic environment such as the stomach. The ternary metal complexes were characterised by elemental analysis, Fourier transform infrared spectroscopy (FT-IR), 1H and 13C nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), thermal analyses, Ultraviolet-Visible (UV-Vis). Solubility studies showed higher aqueous solubility for complexed SPR than the free drug. Dissolution profiles of SPR from the metal complexes exhibited slower dissolution rate of the drug. Permeation studies through the pig's intestine revealed enhanced membrane permeation of the complexed drug. In vitro methyl thiazolyl tetrazolium (MTT) assay showed no noticeable toxic effects of the ternary metal complexes on Caco-2 cell line.
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Affiliation(s)
- Gretta C M'bitsi-Ibouily
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Thashree Marimuthu
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Pradeep Kumar
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Yahya E Choonara
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Lisa C du Toit
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Priyamvada Pradeep
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Girish Modi
- Department of Neurology, Division of Neurosciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Viness Pillay
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Sciences, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa.
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10
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Biggs GS, O'Neill MJ, Carames Mendez P, Scrase TG, Lin Y, Bin-Maarof AM, Bond AD, Boss SR, Barker PD. Use of a fluorinated probe to quantitatively monitor amino acid binding preferences of ruthenium(ii) arene complexes. Dalton Trans 2019; 48:6910-6920. [DOI: 10.1039/c8dt05159c] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Speciation of Ru(ii) arene complexes in mixtures of amino acids with coordinating sidechains is easily resolved by 19F NMR.
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Affiliation(s)
- George S. Biggs
- University of Cambridge
- Chemistry Department
- Cambridge CB2 1EW
- UK
| | - Michael J. O'Neill
- University of Cambridge
- Chemistry Department
- Cambridge CB2 1EW
- UK
- Faculty of Science and Engineering School of Mathematics and Physical Sciences
| | | | | | - Yulu Lin
- University of Cambridge
- Chemistry Department
- Cambridge CB2 1EW
- UK
| | | | - Andrew D. Bond
- University of Cambridge
- Chemistry Department
- Cambridge CB2 1EW
- UK
| | - Sally R. Boss
- University of Cambridge
- Chemistry Department
- Cambridge CB2 1EW
- UK
| | - Paul D. Barker
- University of Cambridge
- Chemistry Department
- Cambridge CB2 1EW
- UK
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11
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Aizawa SI, Takizawa K, Aitani M. Mechanistic study on substitution reaction of a citrato( p-cymene)Ru( ii) complex with sulfur-containing amino acids. RSC Adv 2019; 9:25177-25183. [PMID: 35528666 PMCID: PMC9069928 DOI: 10.1039/c9ra05507j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 08/02/2019] [Indexed: 11/21/2022] Open
Abstract
Thorough kinetic study revealed characteristics of the reaction mechanism for arene ruthenium(ii) complexes with bio-related ligands.
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Affiliation(s)
- Sen-ichi Aizawa
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Kohei Takizawa
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
| | - Momoko Aitani
- Graduate School of Science and Engineering
- University of Toyama
- Toyama 930-8555
- Japan
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12
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Martínez-Peña F, Infante-Tadeo S, Habtemariam A, Pizarro AM. Reversible pH-Responsive Behavior of Ruthenium(II) Arene Complexes with Tethered Carboxylate. Inorg Chem 2018; 57:5657-5668. [PMID: 29688005 DOI: 10.1021/acs.inorgchem.8b00625] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Five complexes of formula [Ru(η6-C6H5CH2COOH)(XY)Cl]Cl/Na (XY = ethylenediamine (1), o-phenylenediamine (2), phenanthroline (3), and oxalato (4)) and [Ru(η6:κ1-C6H5CH2COO)(tmen)]Cl (tmen = N, N, N', N'-tetramethylethylenediamine, 5C) have been synthesized and fully characterized. Five new X-ray crystal structures ([Ru(η6-C6H5CH2COOH)(μ-Cl)Cl]2, 1, 3, 4, and 5C·PF6) have been determined, which are the first examples of ruthenium(II) structures with phenylacetic acid as arene ligand. Furthermore, 5C·PF6 is the first example of a five-membered tether ring with a Ru(η6:κ1-arene:O) bond. The tether ring in these complexes opens in acidic pH (<5) and closes reversibly in aqueous solution. The chlorido open-form undergoes aquation, and the aqua adduct can be observed (prior to ring closure) by NMR. The speciation has an attractive complexity in the pH range 0-12, showing interconversion of the three species (chlorido, aqua, and closed tether), dependent on the proton concentration and the nature of the XY chelating ligand. The closed tether version of 3, complex 3C, with σ-donor/π-acceptor phenanthroline as chelating ligand, opens up more readily (pH 4), while the tether ring in complex 5C hardly opens even at pH as low as 1. We have determined the p Ka of the pendant carboxylic group and that of the aqua adduct (ca. 3 and ca. 7, respectively), which can be finely tuned by the appropriate choice of XY. Complexes 1 and 2, which predominate in their inactive (closed-tether) form in intracellular conditions, show some cytotoxic activity (IC50 130 and 117 μM, respectively) in A2780 ovarian cancer cells. Complex 1 catalyzes the reduction through transfer hydrogenation of pyruvate to lactate and NAD+ to NADH in the presence of formate as H-source. Co-incubation with sodium formate decreases the IC50 value of 1 in A2780 cancer cells significantly.
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Affiliation(s)
| | - Sonia Infante-Tadeo
- IMDEA Nanociencia, Faraday 9 , Ciudad Universitaria de Cantoblanco , Madrid 28049 , Spain
| | - Abraha Habtemariam
- IMDEA Nanociencia, Faraday 9 , Ciudad Universitaria de Cantoblanco , Madrid 28049 , Spain
| | - Ana M Pizarro
- IMDEA Nanociencia, Faraday 9 , Ciudad Universitaria de Cantoblanco , Madrid 28049 , Spain
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13
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Biancalana L, Ciancaleoni G, Zacchini S, Monti A, Marchetti F, Pampaloni G. Solvent-Dependent Hemilability of (2-Diphenylphosphino)Phenol in a Ru(II) para-Cymene System. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00071] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Lorenzo Biancalana
- Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13, I-56124 Pisa, Italy
- CIRCC, via Celso Ulpiani 27, I-70126 Bari, Italy
| | - Gianluca Ciancaleoni
- Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13, I-56124 Pisa, Italy
- CIRCC, via Celso Ulpiani 27, I-70126 Bari, Italy
| | - Stefano Zacchini
- CIRCC, via Celso Ulpiani 27, I-70126 Bari, Italy
- Università di Bologna, Dipartimento di Chimica Industriale “Toso Montanari”, Viale Risorgimento 4, I-40136 Bologna, Italy
| | - Andrea Monti
- Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13, I-56124 Pisa, Italy
| | - Fabio Marchetti
- Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13, I-56124 Pisa, Italy
- CIRCC, via Celso Ulpiani 27, I-70126 Bari, Italy
| | - Guido Pampaloni
- Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13, I-56124 Pisa, Italy
- CIRCC, via Celso Ulpiani 27, I-70126 Bari, Italy
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14
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Cross JM, Gallagher N, Gill JH, Jain M, McNeillis AW, Rockley KL, Tscherny FH, Wirszycz NJ, Yufit DS, Walton JW. Pyridylphosphinate metal complexes: synthesis, structural characterisation and biological activity. Dalton Trans 2018; 45:12807-13. [PMID: 27468432 DOI: 10.1039/c6dt01264g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
For the first time, a series of 25 pseudo-octahedral pyridylphosphinate metal complexes (Ru, Os, Rh, Ir) has been synthesised and assessed in biological systems. Each metal complex incorporates a pyridylphosphinate ligand, a monodentate halide and a capping η(6)-bound aromatic ligand. Solid- and solution-state analyses of two complexes reveal a structural preference for one of a possible two diastereomers. The metal chlorides hydrolyse rapidly in D2O to form a 1 : 1 equilibrium ratio between the aqua and chloride adducts. The pKa of the aqua adduct depends upon the pyridyl substituent and the metal but has little dependence upon the phosphinate R' group. Toxicity was measured in vitro against non-small cell lung carcinoma H460 cells, with the most potent complexes reporting IC50 values around 50 μM. Binding studies with selected amino acids and nucleobases provide a rationale for the variation in toxicity observed within the series. Finally, an investigation into the ability of the chelating amino acid l-His to displace the phosphinate O-metal bond shows the potential for phosphinate complexes to act as prodrugs that can be activated in the intracellular environment.
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Affiliation(s)
- Jasmine M Cross
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
| | - Natalie Gallagher
- School of Medicine, Pharmacy and Health, Durham University, Wolfson Research Institute, Queen's Campus, Stockton on Tees, TS17 6BH, UK
| | - Jason H Gill
- School of Medicine, Pharmacy and Health, Durham University, Wolfson Research Institute, Queen's Campus, Stockton on Tees, TS17 6BH, UK
| | - Mohit Jain
- School of Medicine, Pharmacy and Health, Durham University, Wolfson Research Institute, Queen's Campus, Stockton on Tees, TS17 6BH, UK
| | | | - Kimberly L Rockley
- School of Medicine, Pharmacy and Health, Durham University, Wolfson Research Institute, Queen's Campus, Stockton on Tees, TS17 6BH, UK
| | - Fiona H Tscherny
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
| | - Natasha J Wirszycz
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
| | - Dmitry S Yufit
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
| | - James W Walton
- Department of Chemistry, Durham University, South Road, Durham, DH1 3LE, UK.
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15
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Martínez-Peña F, Pizarro AM. Control of Reversible Activation Dynamics of [Ru{η 6 :κ 1 -C 6 H 5 (C 6 H 4 )NH 2 }(XY)] n+ and the Effect of Chelating-Ligand Variation. Chemistry 2017; 23:16231-16241. [PMID: 28734001 DOI: 10.1002/chem.201701681] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2017] [Indexed: 02/03/2023]
Abstract
The potential use of organoruthenium complexes as anticancer drugs is well known. Herein, a family of activatable tethered ruthenium(II) arene complexes of general formula [Ru{η6 :κ1 -C6 H5 (C6 H4 )NH2 }(XY)]n+ (closed tether ring) bearing different chelating XY ligands (XY=aliphatic diamine, phenylenediamine, oxalato, bis(phosphino)ethane) is reported. The activation of these complexes (closed- to open-tether conversion) occurs in methanol and DMSO at different rates and to different reaction extents at equilibrium. Most importantly, RuII -complex activation (cleavage of the Ru-Ntether bond) occurs in aqueous solution at high proton concentration (upon Ntether protonation). The activation dynamics can be modulated by rational variation of the XY chelating ligand. The electron-donating capability and steric hindrance of XY have a direct impact on the reactivity of the Ru-N bond, and XY=N,N'-dimethyl-, N,N'-diethyl-, and N,N,N',N'-tetramethylethylenediamine afford complexes that are more prone to activation. Such activation in acidic media is fully reversible, and proton concentration also governs the deactivation rate, that is, tether-ring closure slows down with decreasing pH. Interaction of a closed-tether complex and its open-tether counterpart with 5'-guanosine monophosphate revealed selectivity of the active (open) complex towards interaction with nucleobases. This work presents ruthenium tether complexes as exceptional pH-dependent switches with potential applications in cancer research.
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Affiliation(s)
| | - Ana M Pizarro
- IMDEA Nanociencia, Faraday 9, Ciudad Universitaria de Cantoblanco, Madrid, 28049, Spain.,Nanobiotecnología (IMDEA-Nanociencia), Unidad Asociada al Centro Nacional de Biotecnología (CSIC), Ciudad Universitaria de Cantoblanco, Madrid, 28049, Spain
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16
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Jia JJ, Li SX, Yin XJ, Liao BL, Jiang YM. Effect of different temperature on the N-[(3-pyridine)-sulfonyl]aspartate polymers synthesis: Crystal structure and fluorescence. RUSS J INORG CHEM+ 2017. [DOI: 10.1134/s0036023617010181] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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17
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Chanawanno K, Kondeti V, Caporoso J, Paruchuri S, Leeper TC, Herrick RS, Ziegler CJ. Facile rhenium-peptide conjugate synthesis using a one-pot derived Re(CO)3 reagent. Dalton Trans 2016; 45:4729-35. [PMID: 26863280 DOI: 10.1039/c5dt04694g] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have synthesized two Re(CO)3-modified lysine complexes (1 and 2), where the metal is attached to the amino acid at the Nε position, via a one-pot Schiff base formation reaction. These compounds can be used in the solid phase synthesis of peptides, and to date we have produced four conjugate systems incorporating neurotensin, bombesin, leutenizing hormone releasing hormone, and a nuclear localization sequence. We observed uptake into human umbilical vascular endothelial cells as well as differential uptake depending on peptide sequence identity, as characterized by fluorescence and rhenium elemental analysis.
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