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Velugula K, Kumar A, Chinta JP. Nuclease and anticancer activity of antioxidant conjugated terpyridine metal complexes. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119596] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Kumar A, Kuhn LT, Balbach J. A Cu 2+ complex induces the aggregation of human papillomavirus oncoprotein E6 and stabilizes p53. FEBS J 2018; 285:3013-3025. [PMID: 29931810 DOI: 10.1111/febs.14591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 05/14/2018] [Accepted: 06/20/2018] [Indexed: 12/13/2022]
Abstract
Papillomavirus oncoprotein E6 is a critical factor in the modulation of cervical cancer in humans. At the molecular level, formation of the E6-E6AP-p53 ternary complex, which directs p53's degradation, is the key instigator of cancer transforming properties. Herein, a Cu2+ anthracenyl-terpyridine complex is described which specifically induces the aggregation of E6 in vitro and in cultured cells. For a hijacking mechanism, both E6 and E6AP are required for p53 ubiquitination and degradation. The Cu2+ complex interacts with E6 at the E6AP and p53 binding sites. We show that E6 function is suppressed by aggregation, rendering it incapable of hijacking p53 and thus increasing its cellular level. Therapeutic treatments of cervical cancer are currently unavailable to infected individuals. We anticipate that this Cu2+ complex might open up a new therapeutic avenue for the design and development of new chemical entities for the diagnosis and treatment of HPV-induced cancers.
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Affiliation(s)
- Amit Kumar
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, UK.,Institute of Physics, Biophysics, Martin-Luther-University Halle-Wittenberg, Germany.,Institute of Technical Biochemistry e.V., Martin-Luther-University Halle-Wittenberg, Germany
| | - Lars T Kuhn
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, UK
| | - Jochen Balbach
- Institute of Physics, Biophysics, Martin-Luther-University Halle-Wittenberg, Germany.,Institute of Technical Biochemistry e.V., Martin-Luther-University Halle-Wittenberg, Germany
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Kumar A. A small-molecule acts as a 'roadblock' on DNA, hampering its fundamental processes. J Inorg Biochem 2017; 176:134-139. [PMID: 28892676 DOI: 10.1016/j.jinorgbio.2017.08.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 08/02/2017] [Accepted: 08/25/2017] [Indexed: 12/24/2022]
Abstract
DNA replication, RNA and protein synthesis are the most fundamental housekeeping processes involved in an organism's growth. Failure or dysregulation of these pathways are often deleterious to life. Therefore, selective inhibition of such processes can be crucial for the inhibition of the growth of any cell, including cancer cells, pathogenic bacteria or other deadly microbes. In the present study, a Zn2+ complex is shown to act as a roadblock of DNA. The Zn2+ complex inhibited DNA taq polymerase activity under the in vitro conditions of polymerase chain reaction (PCR). Under in vivo conditions, it readily crosses the cell wall of gram-negative bacteria (Escherichia coli), leading to the reduction of RNA levels as well as protein content. Growth of pathogenic bacteria (e.g., Staphylococcus aureus and Pseudomonas aeruginosa) was also significantly retarded. The Zn2+ complex binds to the grooves of the DNA without inducing conformational changes or exhibiting chemical nuclease activity. To the best current knowledge, this is first coordination complex exhibiting a 'roadblock' property under both in vitro and in vivo conditions (show at all three levels - DNA, RNA and protein). The label-free approach used in this study may offer an alternative route towards fighting pathogenic bacteria or cancer cells by hampering fundamental cellular processes.
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Affiliation(s)
- Amit Kumar
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK; Institute of Physics, Biophysics, Martin-Luther-University Halle-Wittenberg, Germany.
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Kumar A, Balbach J. Targeting the molecular chaperone SlyD to inhibit bacterial growth with a small molecule. Sci Rep 2017; 7:42141. [PMID: 28176839 PMCID: PMC5296862 DOI: 10.1038/srep42141] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Accepted: 01/03/2017] [Indexed: 12/23/2022] Open
Abstract
Molecular chaperones are essential molecules for cell growth, whereby they maintain protein homeostasis. Because of their central cellular function, bacterial chaperones might be potential candidates for drug targets. Antimicrobial resistance is currently one of the greatest threats to human health, with gram-negative bacteria being of major concern. We found that a Cu2+ complex readily crosses the bacterial cell wall and inhibits SlyD, which is a molecular chaperone, cis/trans peptidyl prolyl isomerise (PPIase) and involved in various other metabolic pathways. The Cu2+ complex binds to the active sites of SlyD, which suppresses its PPIase and chaperone activities. Significant cell growth retardation could be observed for pathogenic bacteria (e.g., Staphylococcus aureus and Pseudomonas aeruginosa). We anticipate that rational development of drugs targeting molecular chaperones might help in future control of pathogenic bacterial growth, in an era of rapidly increasing antibiotic resistance.
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Affiliation(s)
- Amit Kumar
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds LS2 9JT, UK
- Institute of Physics, Biophysics, Martin Luther University, Halle, Wittenberg, Germany
| | - Jochen Balbach
- Institute of Physics, Biophysics, Martin Luther University, Halle, Wittenberg, Germany
- Centre for Structure und Dynamics of Proteins (MZP), Martin Luther University Halle, Wittenberg, Germany
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Moorthy M, Rangappan R. Binuclear Cu(II) Schiff base complexes as prescursors for the synthesis of CuO nanoparticles: anticancer activity against MCF-7 cell line. SMART SCIENCE 2016. [DOI: 10.1080/23080477.2016.1196935] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Dutta P, Mondal S, Roy S, Lopez-Torres E, Sinha C. The structural characterization and DNA binding of pyridyl-azo-acetylacetonato complexes of zinc(II), cadmium(II) and mercury(II). Polyhedron 2015. [DOI: 10.1016/j.poly.2015.01.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Lodyga-Chruscinska E, Symonowicz M, Sykula A, Bujacz A, Garribba E, Rowinska-Zyrek M, Oldziej S, Klewicka E, Janicka M, Krolewska K, Cieslak M, Brodowska K, Chruscinski L. Chelating ability and biological activity of hesperetin Schiff base. J Inorg Biochem 2014; 143:34-47. [PMID: 25486205 DOI: 10.1016/j.jinorgbio.2014.11.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 11/19/2014] [Accepted: 11/20/2014] [Indexed: 01/24/2023]
Abstract
Hydrazone hesperetin Schiff base (HHSB) - N-[(±)-[5,7-dihydroxy-2-(3-hydroxy-4-methoxy-phenyl)chroman-4-ylidene]amino]benzamide has been synthesized and its crystal structure was determined. This compound was used for the formation of Cu(II) complexes in solid state and in solution which were characterized using different spectroscopic methods. The analyses of potentiometric titration curves revealed that monomeric and dimeric complexes of Cu(II) are formed above pH7. The ESI-MS (electrospray ionization-mass spectrometry) spectra confirmed their formation. The EPR and UV-visible spectra evidenced the involvement of oxygen and nitrogen atoms in Cu(II) coordination. Hydrazone hesperetin Schiff base can show keto-enol tautomerism and coordinate Cu(II) in the keto (O(-), N, Oket) and in the enolate form (O(-), N, O(-)enol). The semi-empirical molecular orbital method PM6 and DFT (density functional theory) calculations have revealed that the more stable form of the dimeric complex is that one in which the ligand is present in the enol form. The CuHHSB complex has shown high efficiency in the cleavage of plasmid DNA in aqueous solution, indicating its potential as chemical nuclease. Studies on DNA interactions, antimicrobial and cytotoxic activities have been undertaken to gain more information on the biological significance of HHSB and copper(II)-HHSB chelate species.
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Affiliation(s)
- Elzbieta Lodyga-Chruscinska
- Faculty of Biotechnology and Food Chemistry, Lodz University of Technology, Stefanowskiego Street 4/10, 90-924 Lodz, Poland.
| | - Marzena Symonowicz
- Faculty of Biotechnology and Food Chemistry, Lodz University of Technology, Stefanowskiego Street 4/10, 90-924 Lodz, Poland
| | - Anna Sykula
- Faculty of Biotechnology and Food Chemistry, Lodz University of Technology, Stefanowskiego Street 4/10, 90-924 Lodz, Poland
| | - Anna Bujacz
- Faculty of Biotechnology and Food Chemistry, Lodz University of Technology, Stefanowskiego Street 4/10, 90-924 Lodz, Poland
| | - Eugenio Garribba
- Dipartimento di Chimica e Farmacia, Centro Interdisciplinare per lo Sviluppo della Ricerca Biotecnologica e per lo Studio della Biodiversità della Sardegna, Università di Sassari, via Vienna 2, I-07100 Sassari, Italy
| | - Magdalena Rowinska-Zyrek
- Department of Chemistry, University of Wroclaw, F. Joliot-Curie Street 14, 50-383 Wroclaw, Poland
| | - Stanislaw Oldziej
- Intercollegiate Faculty of Biotechnology, University of Gdansk and Medical University of Gdansk, Kladki 24, 80-922 Gdansk, Poland
| | - Elzbieta Klewicka
- Faculty of Biotechnology and Food Chemistry, Lodz University of Technology, Stefanowskiego Street 4/10, 90-924 Lodz, Poland
| | - Magdalena Janicka
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza Street 112, 90-363 Lodz, Poland
| | - Karolina Krolewska
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza Street 112, 90-363 Lodz, Poland
| | - Marcin Cieslak
- Centre of Molecular and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza Street 112, 90-363 Lodz, Poland
| | - Katarzyna Brodowska
- Faculty of Biotechnology and Food Chemistry, Lodz University of Technology, Stefanowskiego Street 4/10, 90-924 Lodz, Poland
| | - Longin Chruscinski
- Faculty of Process and Environmental Engineering, Lodz University of Technology, Wolczanska 175, 90-924 Lodz, Poland
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Synthesis, physico-chemical properties and biological analysis of newly obtained copper(II) complexes with pyrazole derivatives. J Inorg Biochem 2014; 135:68-76. [DOI: 10.1016/j.jinorgbio.2014.02.014] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2013] [Revised: 02/24/2014] [Accepted: 02/27/2014] [Indexed: 02/02/2023]
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Mixed-ligand binuclear copper(II) complex of 5-methylsalicylaldehyde and 2,2′-bipyridyl: Synthesis, crystal structure, DNA binding and nuclease activity. J CHEM SCI 2014. [DOI: 10.1007/s12039-014-0607-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Alagesan M, Bhuvanesh NSP, Dharmaraj N. Binuclear copper complexes: synthesis, X-ray structure and interaction study with nucleotide/protein by in vitro biochemical and electrochemical analysis. Eur J Med Chem 2014; 78:281-93. [PMID: 24686015 DOI: 10.1016/j.ejmech.2014.03.043] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2013] [Revised: 02/17/2014] [Accepted: 03/14/2014] [Indexed: 10/25/2022]
Abstract
Two new, binuclear copper(II) hydrazone complexes have been synthesized and characterized by various physico-chemical techniques including single crystal X-ray diffraction. Interaction of these complexes with nucleotide and protein were analyzed by in vitro biochemical and electrochemical analysis. Both the complexes exhibited intercalative mode of binding with DNA. Further, gel electrophoresis assay demonstrated the ability of the complexes to cleave the supercoiled pBR322 plasmid DNA to nicked circular DNA form. Cytotoxicity of the complexes performed against a panel of cancer cell lines and a normal cell line proved that these complexes are potentially cytotoxic against the cancerous cell lines, particularly with IC50 as low as 0.7 μM against HeLa cell line.
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Affiliation(s)
- M Alagesan
- Inorganic and Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641 046, India
| | - N S P Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, TX 77843, USA
| | - N Dharmaraj
- Inorganic and Nanomaterials Research Laboratory, Department of Chemistry, Bharathiar University, Coimbatore 641 046, India.
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