1
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Mansour AM, Radacki K, Mostafa GAE, Ali EA, Shehab OR. Antimicrobial properties of triazolato terpyridine Pd(II) and Pt(II) complexes formed by [3+2] cycloaddition coupling reaction. Bioorg Chem 2024; 146:107262. [PMID: 38467092 DOI: 10.1016/j.bioorg.2024.107262] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2024] [Revised: 02/18/2024] [Accepted: 03/05/2024] [Indexed: 03/13/2024]
Abstract
Modern classes of antimicrobials are crucial because most drugs in development today are basically antibiotic derivatives. Even though a large number of metal-based compounds have been studied as antimicrobial agents, relatively few studies have examined the antimicrobial properties of Pd(II) and Pt(II) compounds. The [3+2] cycloaddition reactions of [M(N3)L]PF6 (M = Pd(II) and Pt(II); L = 4'-(2-pyridyl)-2,2':6',2″-terpyridine) with 4,4,4-trifluoro-2-butynoic acid ethyl ester gave the corresponding triazolate complexes. The reaction products were fully characterized with a variety of analytical and spectroscopic tools including X-ray crystallographic analysis. The crystal structure of [Pd(triazolatoCF3,COOCH2CH3)L]PF6 provided cut-off evidence that the kinetically formed N1-triazolato isomer favoured the isomerization to the thermodynamically stable N2-analogue. The experimental work was complemented with computational work to get an insight into the nature of the predominant triazolate isomer. The lysozyme binding affinity of the triazolate complexes was examined by mass spectrometry. An analysis of the lysozyme Pd(II) adducts suggests a coordinative covalent mode of binding via the loss of the triazolato ligand. The free ligand and its triazolate complexes displayed selective toxicity against Candida albicans and Cryptococcus neoformans, while no cytotoxicity was observed against the normal human embryonic kidney cell line.
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Affiliation(s)
- Ahmed M Mansour
- Department of Chemistry, United Arab Emirates University, Al-Ain, United Arab Emirates; Department of Chemistry, Cairo University, Faculty of Science, Gamma Street, Giza, Cairo 12613, Egypt.
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Gamal A E Mostafa
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Essam A Ali
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Ola R Shehab
- Department of Chemistry, Cairo University, Faculty of Science, Gamma Street, Giza, Cairo 12613, Egypt
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2
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Voeten RLC, Majeed HA, Bos TS, Somsen GW, Haselberg R. Investigating direct current potentials that affect native protein conformation during trapped ion mobility spectrometry-mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2024; 59:e5021. [PMID: 38605451 DOI: 10.1002/jms.5021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 10/13/2023] [Accepted: 03/06/2024] [Indexed: 04/13/2024]
Abstract
Trapped ion mobility spectrometry-time-of-flight mass spectrometry (TIMS-TOFMS) has emerged as a tool to study protein conformational states. In TIMS, gas-phase ions are guided across the IM stages by applying direct current (DC) potentials (D1-6), which, however, might induce changes in protein structures through collisional activation. To define conditions for native protein analysis, we evaluated the influence of these DC potentials using the metalloenzyme bovine carbonic anhydrase (BCA) as primary test compound. The variation of DC potentials did not change BCA-ion charge and heme content but affected (relative) charge-state intensities and adduct retention. Constructed extracted-ion mobilograms and corresponding collisional cross-section (CCS) profiles gave useful insights in (alterations of) protein conformational state. For BCA, the D3 and D6 potential (which are applied between the deflection transfer and funnel 1 [F1] and the accumulation exit and the start of the ramp, respectively) had most profound effects, showing multimodal CCS distributions at higher potentials indicating gradual unfolding. The other DC potentials only marginally altered the CCS profiles of BCA. To allow for more general conclusions, five additional proteins of diverse molecular weight and conformational stability were analyzed, and for the main protein charge states, CCS profiles were constructed. Principal component analysis (PCA) of the obtained data showed that D1 and D3 exhibit the highest degree of correlation with the ratio of folded and unfolded protein (F/U) as extracted from the mobilograms obtained per set D potential. The correlation of D6 with F/U and protein charge were similar, and D2, D4, and D5 showed an inverse correlation with F/U but were correlated with protein charge. Although DC boundary values for induced conformational changes appeared protein dependent, a set of DC values could be determined, which assured native analysis of most proteins.
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Affiliation(s)
- Robert L C Voeten
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Centre for Analytical Sciences Amsterdam (CASA), Amsterdam, The Netherlands
- TI-COAST, Amsterdam, The Netherlands
| | - Hany A Majeed
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Centre for Analytical Sciences Amsterdam (CASA), Amsterdam, The Netherlands
| | - Tijmen S Bos
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Centre for Analytical Sciences Amsterdam (CASA), Amsterdam, The Netherlands
| | - Govert W Somsen
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Centre for Analytical Sciences Amsterdam (CASA), Amsterdam, The Netherlands
| | - Rob Haselberg
- Division of BioAnalytical Chemistry, Department of Chemistry and Pharmaceutical Sciences, Amsterdam Institute of Molecular and Life Sciences (AIMMS), Vrije Universiteit Amsterdam, Amsterdam, The Netherlands
- Centre for Analytical Sciences Amsterdam (CASA), Amsterdam, The Netherlands
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3
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Yang F, Rousselot Pailley P, Backov R, Courvoisier-Dezord E, Amouric A, Tron T, Mekmouche Y. Tuning Chemoenzymatic Pd/Laccase Conformation Toward Optimized Heterogeneous Aerobic Oxidation. Chembiochem 2024; 25:e202300781. [PMID: 38117648 DOI: 10.1002/cbic.202300781] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 12/19/2023] [Accepted: 12/19/2023] [Indexed: 12/22/2023]
Abstract
Heterogeneous chemoenzymatic catalysts differing in their spatial organization and relative orientation of their enzymatic laccase and Pd units confined into macrocellular silica foams were tested on veratryl alcohol oxidation. When operating under continuous flow, we show that the catalytic efficiency of hybrids is significantly enhanced when the Pd(II) complex is combined with a laccase exhibiting a surface located lysine next to the T1 oxidation site of the enzyme.
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Affiliation(s)
- Fangfang Yang
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
- College of Chemistry and Chemical Engineering, Yantai University, 264005, Yantai, China
| | | | - Rénal Backov
- Université de Bordeaux, CNRS, CRPP, UMR5031, 115 Avenue Albert Schweitzer, 33600, Pessac, France
| | | | - Agnès Amouric
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
| | - Thierry Tron
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
| | - Yasmina Mekmouche
- Aix Marseille Univ, CNRS, Centrale Marseille, iSm2, 13397, Marseille, France
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4
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Hakkennes MA, Buda F, Bonnet S. MetalDock: An Open Access Docking Tool for Easy and Reproducible Docking of Metal Complexes. J Chem Inf Model 2023; 63:7816-7825. [PMID: 38048559 PMCID: PMC10751784 DOI: 10.1021/acs.jcim.3c01582] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 11/13/2023] [Accepted: 11/14/2023] [Indexed: 12/06/2023]
Abstract
Despite the proven potential of metal complexes as therapeutics, the lack of computational tools available for the high-throughput screening of their interactions with proteins is a limiting factor toward clinical developments. To address this challenge, we introduce MetalDock, an easy-to-use, open access docking software for docking metal complexes to proteins. Our tool integrates the AutoDock docking engine with three well-known quantum software packages to automate the docking of metal-organic complexes to proteins. We used a Monte Carlo sampling scheme to obtain the missing Lennard-Jones parameters for 12 metal atom types and demonstrated that these parameters generalize exceptionally well. Our results show that the poses obtained by MetalDock are highly accurate, as they predict the binding geometries experimentally determined by crystal structures with high spatial reproducibility. Three different case studies are presented that demonstrate the versatility of MetalDock for the docking of diverse metal-organic compounds to different biomacromolecules, including nucleic acids.
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Affiliation(s)
- Matthijs
L. A. Hakkennes
- Leiden
Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Francesco Buda
- Leiden
Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
| | - Sylvestre Bonnet
- Leiden
Institute of Chemistry, Leiden University, P.O. Box 9502, 2300 RA Leiden, The Netherlands
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5
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In silico investigation of organometallic complexes for identification of RNase A inhibitor. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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6
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Ferraro G, Demitri N, Vitale L, Sciortino G, Sanna D, Ugone V, Garribba E, Merlino A. Spectroscopic/Computational Characterization and the X-ray Structure of the Adduct of the V IVO-Picolinato Complex with RNase A. Inorg Chem 2021; 60:19098-19109. [PMID: 34847328 PMCID: PMC8693189 DOI: 10.1021/acs.inorgchem.1c02912] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Indexed: 12/12/2022]
Abstract
The structure, stability, and enzymatic activity of the adduct formed upon the reaction of the V-picolinato (pic) complex [VIVO(pic)2(H2O)], with an octahedral geometry and the water ligand in cis to the V═O group, with the bovine pancreatic ribonuclease (RNase A) were studied. While electrospray ionization-mass spectrometry, circular dichroism, and ultraviolet-visible absorption spectroscopy substantiate the interaction between the metal moiety and RNase A, electron paramagnetic resonance (EPR) allows us to determine that a carboxylate group, stemming from Asp or Glu residues, and imidazole nitrogen from His residues are involved in the V binding at acidic and physiological pH, respectively. Crystallographic data demonstrate that the VIVO(pic)2 moiety coordinates the side chain of Glu111 of RNase A, by substituting the equatorial water molecule at acidic pH. Computational methods confirm that Glu111 is the most affine residue and interacts favorably with the OC-6-23-Δ enantiomer establishing an extended network of hydrogen bonds and van der Waals stabilizations. By increasing the pH around neutrality, with the deprotonation of histidine side chains, the binding of the V complex to His105 and His119 could occur, with that to His105 which should be preferred when compared to that to the catalytically important His119. The binding of the V compound affects the enzymatic activity of RNase A, but it does not alter its overall structure and stability.
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Affiliation(s)
- Giarita Ferraro
- Department
of Chemical Sciences, University of Naples
Federico II, I-80126 Napoli, Italy
| | - Nicola Demitri
- Elettra−Sincrotrone
Trieste, S.S. 14 km 163.5
in Area Science Park, 34149 Trieste, Italy
| | - Luigi Vitale
- Department
of Chemical Sciences, University of Naples
Federico II, I-80126 Napoli, Italy
| | - Giuseppe Sciortino
- Institute
of Chemical Research of Catalonia (ICIQ), The Barcelona Institute
of Science and Technology, 43007 Tarragona, Spain
| | - Daniele Sanna
- Istituto
di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Trav. La Crucca 3, I-07100 Sassari, Italy
| | - Valeria Ugone
- Istituto
di Chimica Biomolecolare, Consiglio Nazionale delle Ricerche, Trav. La Crucca 3, I-07100 Sassari, Italy
| | - Eugenio Garribba
- Dipartimento
di Scienze Mediche, Chirurgiche e Sperimentali, Università di Sassari, Viale San Pietro, I-07100 Sassari, Italy
| | - Antonello Merlino
- Department
of Chemical Sciences, University of Naples
Federico II, I-80126 Napoli, Italy
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7
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Mansour AM. Pd(ii) and Pt(ii) complexes of tridentate ligands with selective toxicity against Cryptococcus neoformans and Candida albicans. RSC Adv 2021; 11:39748-39757. [PMID: 35494132 PMCID: PMC9044551 DOI: 10.1039/d1ra06559a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 11/22/2021] [Indexed: 12/21/2022] Open
Abstract
Novel Pd(ii) and Pt(ii) complexes of the tridentate 2,6-bis(1-ethyl-benzimidazol-2'-yl)pyridine (LBZ), and 4'-(2-pyridyl)-2,2':6',2''-terpyridine (LPY) ligands were synthesized, characterized using a variety of analytical and spectroscopic tools, and screened for their potential antimicrobial properties against some bacterial and fungal strains as well as cytotoxicity against healthy human embryonic kidney (HEK293) cells. The electronic structures of the complexes were investigated by time-dependent density functional theory calculations. The free ligand LPY and benzimidazole complexes exhibited selective toxicity against Cryptococcus neoformans and Candida albicans, while displaying no cytotoxicity against HEK293. In the case of Cryptococcus neoformans, the antifungal activities of the benzimidazole-based complexes (MIC = 1.58-2.62 μM) are higher than those of the reference drug fluconazole (26.1 μM).
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Affiliation(s)
- Ahmed M Mansour
- Department of Chemistry, Faculty of Science, Cairo University Gamma Street Giza Cairo 12613 Egypt
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8
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Mansour AM, Radacki K, Shehab OR. Sulfonate improves water solubility and cell selective toxicity and alters the lysozyme binding activity of half sandwich Rh(iii) complexes. Dalton Trans 2021; 50:10701-10706. [PMID: 34337627 DOI: 10.1039/d1dt00979f] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Introduction of the propyl-sulfonic acid group at N1 of the coordinated 2-(2-pyridyl)benzimidazole ligand (L) in [RhCl(η5-C5Me5)L](CF3SO3) gives rise to a water-soluble complex, which can bind to the model protein lysozyme via non-covalent interactions. The complex shows selective moderate toxicity against Cryptococcus neoformans (MIC = 21.6-43.3 μM) and exhibits no cytotoxicity to healthy HEK293 cells.
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Affiliation(s)
- Ahmed M Mansour
- Department of Chemistry, Faculty of Science, Cairo University, Gamma Street, Giza, Cairo 12613, Egypt.
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Ola R Shehab
- Department of Chemistry, Faculty of Science, Cairo University, Gamma Street, Giza, Cairo 12613, Egypt.
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9
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Ferraro G, Loreto D, Merlino A. Interaction of Platinum-based Drugs with Proteins: An Overview of Representative Crystallographic Studies. Curr Top Med Chem 2021; 21:6-27. [PMID: 32579504 DOI: 10.2174/1568026620666200624162213] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Revised: 05/11/2020] [Accepted: 05/13/2020] [Indexed: 12/27/2022]
Abstract
Pt-based drugs are widely used in clinics for the treatment of cancer. The mechanism of action of these molecules relies on their interaction with DNA. However, the recognition of these metal compounds by proteins plays an important role in defining pharmacokinetics, side effects and their overall pharmacological profiles. Single crystal X-ray diffraction studies provided important information on the molecular mechanisms at the basis of this process. Here, the molecular structures of representative adducts obtained upon reaction with proteins of selected Pt-based drugs, including cisplatin, carboplatin and oxaliplatin, are briefly described and comparatively examined. Data indicate that metal ligands play a significant role in driving the reaction of Pt compounds with proteins; non-covalent interactions that occur in the early steps of Pt compound/protein recognition process play a crucial role in defining the structure of the final Pt-protein adduct. In the metallated protein structures, Pt centers coordinate few protein side chains, such as His, Met, Cys, Asp, Glu and Lys residues upon releasing labile ligands.
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Affiliation(s)
- Giarita Ferraro
- Department of Chemistry Ugo Schiff, University of Florence, Sesto Fiorentino, Firenze, Italy
| | - Domenico Loreto
- Department of Chemical Sciences, University of Naples Federico II, Napoli, Italy
| | - Antonello Merlino
- Department of Chemical Sciences, University of Naples Federico II, Napoli, Italy
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10
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Du Y, Du Y, Cui M, Liu Z. Characterization of the Noncovalent Interactions between Lysozyme and Panaxadiol Glycosides by Intensity-Fading – Matrix-Assisted Laser Desorption Ionization – Mass Spectrometry (IF-MALDI-MS). ANAL LETT 2021. [DOI: 10.1080/00032719.2020.1867995] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Yonggang Du
- Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
| | - Yang Du
- Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
- University of Science and Technology of China, Hefei, Anhui, China
| | - Meng Cui
- Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
- University of Science and Technology of China, Hefei, Anhui, China
| | - Zhiqiang Liu
- Changchun Center of Mass Spectrometry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China
- University of Science and Technology of China, Hefei, Anhui, China
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11
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Abstract
Recent advances in structural studies unveiling the basis of the metal compounds/protein recognition process are discussed.
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Affiliation(s)
- Antonello Merlino
- Department of Chemical Sciences
- University of Naples Federico II
- Complesso Universitario di Monte Sant’Angelo
- Napoli
- Italy
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12
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Mansour AM, Radacki K. Experimental and DFT studies of sulfadiazine 'piano-stool' Ru(ii) and Rh(iii) complexes. RSC Adv 2020; 10:10673-10680. [PMID: 35492929 PMCID: PMC9050370 DOI: 10.1039/d0ra01085e] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Accepted: 02/28/2020] [Indexed: 11/21/2022] Open
Abstract
While sulfadiazine (HLSZ) is extensively used to elaborate complexes of intriguing biological applications (e.g. topical antibiotic silvadene; silver sulfadiazine), the molecular structure modification of sulfadiazine or even other sulfa drugs by coordination to either η6-cymene Ru(ii) or η5-Cp* Rh(iii) motif has not been investigated. Here, half-sandwich organoruthenium(ii) and organorhodium(iii) compounds of the type [(η6-p-cymene)Ru(LSZ)2] (1) and [(η5-C5Me5)Rh(LSZ)2] (2) are synthesized, characterized and evaluated for their potential antimicrobial activity. Spectroscopic and single crystal X-ray analysis showed that LSZ is coordinated to Rh(iii) via both the sulfonamide and pyrimidine nitrogen atoms forming "piano-stool" geometry. In 2, the NMR equivalence clearly pointed to participation of two LSZ molecules in a fluxional process in which the third bond of the base of the stool is oscillating between two equivalent sulfonamide nitrogen atoms. While 1 was biologically inactive, complex 2 was potent against Gram-positive bacteria, Candida albicans and Cryptococcus neoformans. Hen white egg lysozyme (HEWL), a model protein, reacted covalently with 2via the loss of one LSZ molecule, while compound 1 decomposed during the interaction with that protein.
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Affiliation(s)
- Ahmed M Mansour
- Department of Chemistry, Faculty of Science, Cairo University Gamma Street Giza Cairo 12613 Egypt
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg Am Hubland D-97074 Würzburg Germany
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13
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Mansour AM, Shehab OR, Radacki K. Role of Sulfonate Appendage in the Protein Binding Affinity of Half-Sandwich Ruthenium(II)(η6
-p
-Cym) Complexes. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.201901089] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Ahmed M. Mansour
- Chemistry Department; Faculty of Science; Cairo University; Gamma Street, Giza 12613 Cairo Egypt
| | - Ola R. Shehab
- Chemistry Department; Faculty of Science; Cairo University; Gamma Street, Giza 12613 Cairo Egypt
| | - Krzysztof Radacki
- Institut für Anorganische Chemie; Faculty of Science; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
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14
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Protein binding affinity of biologically active thiourea based half-sandwich Ru(II) cymene complexes. Polyhedron 2020. [DOI: 10.1016/j.poly.2019.114175] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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Mansour AM, Radacki K. Antimicrobial properties of half-sandwich Ir(iii) cyclopentadienyl complexes with pyridylbenzimidazole ligands. Dalton Trans 2020; 49:4491-4501. [DOI: 10.1039/d0dt00451k] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Ethyl group determined the toxicity of pyridylbenzimidazole Ir(iii) compounds and exchange of the group with sulfonate led to diminishing of the antibacterial activity. Increasing the metal content per complex, 3, gave rise to a compound with no toxicity.
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Affiliation(s)
- Ahmed M. Mansour
- Department of Chemistry
- Faculty of Science
- Cairo University
- Giza
- Egypt
| | - Krzysztof Radacki
- Institut für Anorganische Chemie
- Julius-Maximilians-Universität Würzburg
- D-97074 Würzburg
- Germany
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16
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Florio D, Iacobucci I, Ferraro G, Mansour AM, Morelli G, Monti M, Merlino A, Marasco D. Role of the Metal Center in the Modulation of the Aggregation Process of Amyloid Model Systems by Square Planar Complexes Bearing 2-(2'-pyridyl)benzimidazole Ligands. Pharmaceuticals (Basel) 2019; 12:ph12040154. [PMID: 31614832 PMCID: PMC6958441 DOI: 10.3390/ph12040154] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 10/09/2019] [Accepted: 10/10/2019] [Indexed: 11/16/2022] Open
Abstract
The effect of analogue Pd(II)-, Pt(II)-, and Au(III) compounds featuring 2-(2'-pyridyl)benzimidazole on the aggregation propensity of amyloid-like peptides derived from Aβ and from the C-terminal domain of nucleophosmin 1 was investigated. Kinetic profiles of aggregation were evaluated using thioflavin binding assays, whereas the interactions of the compounds with the peptides were studied by UV-Vis absorption spectroscopy and electrospray ionization mass spectrometry. The results indicate that the compounds modulate the aggregation of the investigated peptides using different mechanisms, suggesting that the reactivity of the metal center and the physicochemical properties of the metals (rather than those of the ligands and the geometry of the metal compounds) play a crucial role in determining the anti-aggregation properties.
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Affiliation(s)
- Daniele Florio
- Department of Pharmacy, University of Naples Federico II, Napoli 80134, Italy.
| | - Ilaria Iacobucci
- Department of Chemical Sciences, University of Naples Federico II, Napoli 80126, Italy.
- CEINGE Biotecnologie Avanzate S.c.a r.l., University of Naples Federico II, Napoli 80145, Italy.
| | - Giarita Ferraro
- Department of Chemistry Ugo Schiff, University of Florence, Sesto Fiorentino (FI) 50019, Italy.
| | - Ahmed M Mansour
- Department of Chemistry, Faculty of Science, University of Cairo, Gamma street, Giza, 12613, Egypt.
| | - Giancarlo Morelli
- Department of Pharmacy, University of Naples Federico II, Napoli 80134, Italy.
| | - Maria Monti
- Department of Chemical Sciences, University of Naples Federico II, Napoli 80126, Italy.
- CEINGE Biotecnologie Avanzate S.c.a r.l., University of Naples Federico II, Napoli 80145, Italy.
| | - Antonello Merlino
- Department of Chemical Sciences, University of Naples Federico II, Napoli 80126, Italy.
| | - Daniela Marasco
- Department of Pharmacy, University of Naples Federico II, Napoli 80134, Italy.
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17
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Mansour AM, Shehab OR. Pyridylbenzimidazole-Based Gold(III) Complexes: Lysozyme Metalation, DNA Binding Studies, and Biological Activity. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900155] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Ahmed M. Mansour
- Chemistry Department; Faculty of Science, Gamma Street, Giza; Cairo University; 12613 Cairo Egypt
| | - Ola R. Shehab
- Chemistry Department; Faculty of Science, Gamma Street, Giza; Cairo University; 12613 Cairo Egypt
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18
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Ferraro G, Giorgio A, Mansour AM, Merlino A. Protein-mediated disproportionation of Au(i): insights from the structures of adducts of Au(iii) compounds bearingN,N-pyridylbenzimidazole derivatives with lysozyme. Dalton Trans 2019; 48:14027-14035. [DOI: 10.1039/c9dt02729g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Structural data of protein/gold adducts suggest protein-mediated reduction of Au(iii) into Au(i) and disproportionation of Au(i) into Au(iii) and Au(0).
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Affiliation(s)
- Giarita Ferraro
- Department of Chemistry “Ugo Schiff”
- University of Florence
- Sesto Fiorentino
- Italy
| | - Anna Giorgio
- Department of Chemical Sciences
- University of Naples Federico II
- Complesso Universitario di Monte Sant'Angelo
- Naples
- Italy
| | | | - Antonello Merlino
- Department of Chemical Sciences
- University of Naples Federico II
- Complesso Universitario di Monte Sant'Angelo
- Naples
- Italy
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19
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Mansour AM. Green-Light-Induced PhotoCORM: Lysozyme Binding Affinity towards MnI
and ReI
Carbonyl Complexes and Biological Activity Evaluation. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201801055] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Ahmed M. Mansour
- Chemistry Department; Faculty of Science; Cairo University; Gamma Street 12613 Giza, Cairo Egypt
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