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Schulte NB, Pushie MJ, Martinez A, Sendzik M, Escobedo M, Kuter K, Haas KL. Exploration of the Potential Role of Serum Albumin in the Delivery of Cu(I) to Ctr1. Inorg Chem 2023; 62:4021-4034. [PMID: 36826341 DOI: 10.1021/acs.inorgchem.2c03753] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Human serum albumin (HSA) is the major copper (Cu) carrier in blood. The majority of previous studies that have investigated Cu interactions with HSA have focused primarily on the Cu(II) oxidation state. Yet, cellular Cu uptake by the human copper transport protein (Ctr1), a plasma membrane-embedded protein responsible for Cu uptake into cells, requires Cu(I). Recent in vitro work has determined that reducing agents, such as the ascorbate present in blood, are sufficient to reduce the Cu(II)HSA complex to form Cu(I)HSA and that Cu(I) is bound to HSA with pM affinity. The biological accessibility of Cu(I)HSA suggests that HSA-bound Cu(I) may be an unappreciated form of Cu cargo and a key player in extracellular Cu trafficking. To better understand Cu trafficking by HSA, we sought to investigate the exchange of Cu(I) from HSA to a model peptide of the Cu-binding ectodomain of Ctr1. In this study, we used X-ray absorption near-edge spectroscopy to show that Cu(I) becomes more highly coordinated as increasing amounts of the Ctr1-14 model peptide are added to a solution of Cu(I)HSA. Extended X-ray absorption fine structure (EXAFS) spectroscopy was used to further characterize the interaction of Cu(I)HSA with Ctr1-14 by determining the ligands coordinating Cu(I) and their bond lengths. The EXAFS data support that some Cu(I) likely undergoes complete transfer from HSA to Ctr1-14. This finding of HSA interacting with and releasing Cu(I) to an ectodomain model peptide of Ctr1 suggests a mechanism by which HSA delivers Cu(I) to cells under physiological conditions.
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Affiliation(s)
- Natalie B Schulte
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - M Jake Pushie
- Department of Surgery, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada
| | - Ana Martinez
- Department of Chemistry and Physics, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Madison Sendzik
- Department of Chemistry and Physics, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Maria Escobedo
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Kristin Kuter
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Kathryn L Haas
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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2
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Lelong E, Suh JM, Kim G, Esteban-Gómez D, Cordier M, Lim MH, Delgado R, Royal G, Platas-Iglesias C, Bernard H, Tripier R. Complexation of C-Functionalized Cyclams with Copper(II) and Zinc(II): Similarities and Changes When Compared to Parent Cyclam Analogues. Inorg Chem 2021; 60:10857-10872. [PMID: 34286969 DOI: 10.1021/acs.inorgchem.1c01572] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Herein, we report a comprehensive coordination study of the previously reported ligands cyclam, CB-cyclam, TMC, DMC, and CB-DMC and of their C-functional analogues, cyclam-E, CB-cyclam-E, TMC-E, DMC-E, and CB-DMC-E. This group of ligands includes cyclam, cross-bridged cyclams, their di- or tetramethylated derivatives, and the analogues bearing an additional hydroxyethyl group on one β-N position of the ring. The Cu(II) and Zn(II) complexes of these macrocycles have been highlighted previously for the biological interest, but the details of their structures in the solid state and in solution remained largely unexplored. In particular, we analyzed the impact that adding noncoordinating N-methyl and C-hydroxyethyl functionalities has in the structures of the complexes. All the Cu(II) and Zn(II) complexes were synthesized and investigated using single crystal X-ray diffraction and NMR, electronic absorption, and EPR spectroscopies, along with DFT studies. Dissociation kinetics experiments in acidic conditions and electrochemical studies were also performed. Special attention was paid to analyze the different configurations present in solution and in the solid state, as well as the impact of the C-appended hydroxyethyl group on the coordination behavior. Various ratios of the trans-I, trans-III, and cis-V configurations have been observed depending on the degree of N-methylation and the presence of the ethylene cross-bridge.
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Affiliation(s)
- Evan Lelong
- University Brest, UMR CNRS 6521 CEMCA, 6 avenue Victor le Gorgeu, 29238 Brest, France
| | - Jong-Min Suh
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Gunhee Kim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - David Esteban-Gómez
- Departamento de Química, Facultade de Ciencias & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
| | - Marie Cordier
- University Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226, F-35000 Rennes, France
| | - Mi Hee Lim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Rita Delgado
- Instituto de Tecnologia Química e Biológica António Xavier, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Guy Royal
- CNRS, Département de Chimie Moléculaire (UMR5250), Université Grenoble Alpes, F38400 Grenoble, France
| | - Carlos Platas-Iglesias
- Departamento de Química, Facultade de Ciencias & Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, 15071 A Coruña, Spain
| | - Hélène Bernard
- University Brest, UMR CNRS 6521 CEMCA, 6 avenue Victor le Gorgeu, 29238 Brest, France
| | - Raphaël Tripier
- University Brest, UMR CNRS 6521 CEMCA, 6 avenue Victor le Gorgeu, 29238 Brest, France
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3
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Flores-Rojas GG, Ruiu A, Vonlanthen M, Rojas-Montoya SM, Martínez-Serrano RD, Morales-Morales D, Rivera E. Synthesis and characterization of cyclen cored photoactive star compounds and their Cu(I) and Cu(II) complexes. Effect of the valence and ligand size on their molar extinction coefficient. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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4
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Mathivathanan L, Rogez G, Ben Amor N, Robert V, Raptis RG, Boudalis AK. Origin of Ferromagnetism and Magnetic Anisotropy in a Family of Copper(II) Triangles. Chemistry 2020; 26:12769-12784. [DOI: 10.1002/chem.202001028] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2020] [Indexed: 11/11/2022]
Affiliation(s)
- Logesh Mathivathanan
- Department of Chemistry and Biochemistry and the Biomolecular Sciences Institute Florida International University Miami FL 33199 USA
| | - Guillaume Rogez
- Institut de Physique et Chimie des Matériaux de Strasbourg (IPCMS) CNRS/Université de Strasbourg UMR 7504 67000 Strasbourg France
| | - Nadia Ben Amor
- Laboratoire de Chimie et Physique Quantiques UMR 5626 CNRS/Université Paul Sabatier—Bat. 3R1B4 118 route de Narbonne 31062, Cedex 09 Toulouse France
| | - Vincent Robert
- Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra) Université de Strasbourg 4 rue Blaise Pascal, CS 90032 67081 Strasbourg France
| | - Raphael G. Raptis
- Department of Chemistry and Biochemistry and the Biomolecular Sciences Institute Florida International University Miami FL 33199 USA
| | - Athanassios K. Boudalis
- Institut de Chimie de Strasbourg (UMR 7177, CNRS-Unistra) Université de Strasbourg 4 rue Blaise Pascal, CS 90032 67081 Strasbourg France
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5
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Abstract
It has been reported that Cu(II) ions in human blood are bound mainly to serum albumin (HSA), ceruloplasmin (CP), alpha-2-macroglobulin (α2M) and His, however, data for α2M are very limited and the thermodynamics and kinetics of the copper distribution are not known. We have applied a new LC-ICP MS-based approach for direct determination of Cu(II)-binding affinities of HSA, CP and α2M in the presence of competing Cu(II)-binding reference ligands including His. The ligands affected both the rate of metal release from Cu•HSA complex and the value of KD. Slow release and KD = 0.90 pM was observed with nitrilotriacetic acid (NTA), whereas His showed fast release and substantially lower KD = 34.7 fM (50 mM HEPES, 50 mM NaCl, pH 7.4), which was explained with formation of ternary His•Cu•HSA complex. High mM concentrations of EDTA were not able to elicit metal release from metallated CP at pH 7.4 and therefore it was impossible to determine the KD value for CP. In contrast to earlier inconclusive evidence, we show that α2M does not bind Cu(II) ions. In the human blood serum ~75% of Cu(II) ions are in a nonexchangeable manner bound to CP and the rest exchangeable copper is in an equilibrium between HSA (~25%) and Cu(II)-His-Xaa ternary complexes (~0.2%).
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6
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Selimović E, Komolkin AV, Davletbaeva DA, Egorov AV, Soldatović TV. Interactions of nitrogen-donor biomolecules with copper(II) complexes in Tris buffer. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1730336] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Enisa Selimović
- Department of Chemical-Technological Sciences, State University of Novi Pazar, Novi Pazar, Serbia
| | - Andrei V. Komolkin
- Faculty of Physics, Department of Nuclear-Physics Research Methods, St. Petersburg State University, Saint Petersburg, Russia
| | - Diana A. Davletbaeva
- Faculty of Physics, Department of Nuclear-Physics Research Methods, St. Petersburg State University, Saint Petersburg, Russia
| | - Andrei V. Egorov
- Faculty of Physics, Department of Nuclear-Physics Research Methods, St. Petersburg State University, Saint Petersburg, Russia
| | - Tanja V. Soldatović
- Department of Chemical-Technological Sciences, State University of Novi Pazar, Novi Pazar, Serbia
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7
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Li X, Du K, Sun J, Feng F. Apoferritin as a Carrier of Cu(II) Diethyldithiocarbamate and Biomedical Application for Glutathione-Responsive Combination Chemotherapy. ACS APPLIED BIO MATERIALS 2019; 3:654-663. [DOI: 10.1021/acsabm.9b01014] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Xiao Li
- Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education, Department of Polymer Science & Engineering, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
- Department of Polymer Materials, College of Materials and Chemical Engineering, Hunan Institute of Engineering, Xiangtan 411104, P. R. China
| | - Ke Du
- Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education, Department of Polymer Science & Engineering, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Jian Sun
- Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education, Department of Polymer Science & Engineering, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
| | - Fude Feng
- Key Laboratory of High Performance Polymer Material and Technology of Ministry of Education, Department of Polymer Science & Engineering, School of Chemistry & Chemical Engineering, Nanjing University, Nanjing 210023, P. R. China
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8
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Jomová K, Hudecova L, Lauro P, Simunkova M, Alwasel SH, Alhazza IM, Valko M. A Switch between Antioxidant and Prooxidant Properties of the Phenolic Compounds Myricetin, Morin, 3',4'-Dihydroxyflavone, Taxifolin and 4-Hydroxy-Coumarin in the Presence of Copper(II) Ions: A Spectroscopic, Absorption Titration and DNA Damage Study. Molecules 2019; 24:E4335. [PMID: 31783535 PMCID: PMC6930463 DOI: 10.3390/molecules24234335] [Citation(s) in RCA: 81] [Impact Index Per Article: 16.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2019] [Revised: 11/18/2019] [Accepted: 11/25/2019] [Indexed: 12/13/2022] Open
Abstract
The beneficial effects of polyphenols, predominantly in the context of oxidative stress-related diseases such as cancer, cardiovascular diseases and neurological conditions including Alzheimer's and Parkinson's diseases, have been documented by a number of papers and reviews. The antioxidant/prooxidant properties of phenolic compounds are related mainly to the number and positions of hydroxyl groups and to their redox metal (Cu, Fe) chelating capacity. In this work we studied structurally distinct phenolic molecules such as myricetin, morin, 3',4'-dihydroxy-flavone, taxifolin and 4-hydroxycoumarin, either alone or as interacting with Cu2+ ions. EPR and UV-Vis spectroscopy confirmed that the effective binding of cupric ions to phenolic compounds requires the presence of the 3-OH and 4-CO groups on the flavonoid C ring and unsaturated C2-C3 bond of the C-ring, which permits through-conjugation with the B-ring. An ABTS assay revealed that radical scavenging activities of phenolic compounds are related to their number of hydroxyl groups, planarity of the molecular skeleton, extent of delocalization and they decrease in the order: myricetin > morin > 3',4'-dihydroxyflavone ~ 4-hydroxy coumarin > taxifolin. Absorption titrations indicate that copper ions can modulate the DNA binding affinity of flavonoids via the formation of their Cu-chelates. Gel electrophoresis measurements indicated that the protective effect of the phenolic compounds decreases in the order: 3',4'-dihydroxyflavone > 4-OH coumarin > morin > taxifolin ~ myricetin. This can be explained by the fact that myricetin, taxifolin and morin form stable Cu(II) complexes capable of causing DNA damage via interaction with DNA and ROS formation via the Fenton reaction. Application of ROS scavengers revealed the formation of singlet oxygen, superoxide and hydroxyl radicals and their concerted synergistic effect on the DNA. The overall results suggest that the most pronounced DNA damage has been observed for flavonoids containing higher number of hydroxyl groups (including 3-OH group of the C ring), such as myricetin (six hydroxyl groups), morin and taxifolin (five hydroxyl groups) in the presence of Cu(II) ions. The proposed mechanism of action by which Cu(II) complexes of myricetin, morin and taxifolin interact with DNA predispose these substances to act as potential anticancer agents. The anticancer activity of phenolic compounds can be explained by their moderate prooxidant properties, which can boost ROS formation and kill cancer cells. Alternatively, slight prooxidant properties may activate antioxidant systems, including antioxidant enzymes and low molecular antioxidants such as glutathione and thus act as preventive anticancer agents.
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Affiliation(s)
- Klaudia Jomová
- Department of Chemistry, Constantine the Philosopher University in Nitra, 949 74 Nitra, Slovakia; (K.J.); (L.H.); (P.L.)
| | - Lenka Hudecova
- Department of Chemistry, Constantine the Philosopher University in Nitra, 949 74 Nitra, Slovakia; (K.J.); (L.H.); (P.L.)
| | - Peter Lauro
- Department of Chemistry, Constantine the Philosopher University in Nitra, 949 74 Nitra, Slovakia; (K.J.); (L.H.); (P.L.)
| | - Miriama Simunkova
- Faculty Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia;
| | - Saleh H. Alwasel
- King Saud University, Zoology Department, College of Science, Riyadh 11451, Saudi Arabia (I.M.A.)
| | - Ibrahim M. Alhazza
- King Saud University, Zoology Department, College of Science, Riyadh 11451, Saudi Arabia (I.M.A.)
| | - Marian Valko
- Faculty Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia;
- King Saud University, Zoology Department, College of Science, Riyadh 11451, Saudi Arabia (I.M.A.)
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9
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Li X, Shao F, Sun J, Du K, Sun Y, Feng F. Enhanced Copper-Temozolomide Interactions by Protein for Chemotherapy against Glioblastoma Multiforme. ACS APPLIED MATERIALS & INTERFACES 2019; 11:41935-41945. [PMID: 31644262 DOI: 10.1021/acsami.9b14849] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Current treatment of recurrent glioblastoma multiforme (GBM) demands dose-intense temozolomide (TMZ), a prodrug of 5-(3-methyltriazen-1-yl) imidazole-4-carboxamide (MTIC), based on the spontaneous hydrolysis of TMZ at basic pH. However, how to control the activity of MTIC remains unknown, which poses a particular challenge to search a reliable MTIC receptor. We reported that copper, for the first time, is found to recognize and bind MTIC in the process of TMZ degradation, which means copper can play an important role in enhancing the bioavailability of MTIC derived from TMZ. Using apoferritin as a model copper-bound protein, we studied the copper-TMZ interaction in protein and observed efficient MTIC immobilization with high binding efficiency (up to 92.9% based on original TMZ) and capacity (up to 185 MTIC moieties per protein). The system was stable against both alkaline and acidic pH and could be activated by glutathione to liberate MTIC, which paves a way to deliver a DNA-alkylating agent for both TMZ-sensitive and TMZ-resistant GBM chemotherapy. Our study provides a new insight for understanding the potential relationship between the special GBM microenvironment (specific copper accumulation) and the therapeutic effect of TMZ.
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10
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Witkowska D, Rowińska-Żyrek M. Biophysical approaches for the study of metal-protein interactions. J Inorg Biochem 2019; 199:110783. [PMID: 31349072 DOI: 10.1016/j.jinorgbio.2019.110783] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2019] [Revised: 07/10/2019] [Accepted: 07/15/2019] [Indexed: 12/17/2022]
Abstract
Protein-protein interactions play important roles for a variety of cell functions, often involving metal ions; in fact, metal-ion binding mediates and regulates the activity of a wide range of biomolecules. Enlightening all of the specific features of metal-protein and metal-mediated protein-protein interactions can be a very challenging task; a detailed knowledge of the thermodynamic and spectroscopic parameters and the structural changes of the protein is normally required. For this purpose, many experimental techniques are employed, embracing all fields of Analytical and Bioinorganic Chemistry. In addition, the use of peptide models, reproducing the primary sequence of the metal-binding sites, is also proved to be useful. In this paper, a review of the most useful techniques for studying ligand-protein interactions with a special emphasis on metal-protein interactions is provided, with a critical summary of their strengths and limitations.
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Affiliation(s)
- Danuta Witkowska
- Public Higher Medical Professional School in Opole, Katowicka 68, 45060 Opole, Poland.
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11
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Redox-cycling and intercalating properties of novel mixed copper(II) complexes with non-steroidal anti-inflammatory drugs tolfenamic, mefenamic and flufenamic acids and phenanthroline functionality: Structure, SOD-mimetic activity, interaction with albumin, DNA damage study and anticancer activity. J Inorg Biochem 2019; 194:97-113. [DOI: 10.1016/j.jinorgbio.2019.02.010] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Revised: 02/15/2019] [Accepted: 02/18/2019] [Indexed: 12/21/2022]
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12
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Coverdale JPC, Katundu KGH, Sobczak AIS, Arya S, Blindauer CA, Stewart AJ. Ischemia-modified albumin: Crosstalk between fatty acid and cobalt binding. Prostaglandins Leukot Essent Fatty Acids 2018; 135:147-157. [PMID: 30103926 PMCID: PMC6109191 DOI: 10.1016/j.plefa.2018.07.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 07/17/2018] [Accepted: 07/17/2018] [Indexed: 02/06/2023]
Abstract
Myocardial ischemia is difficult to diagnose effectively with still few well-defined biochemical markers for identification in advance, or in the absence of myocardial necrosis. "Ischemia-modified albumin" (IMA), a form of albumin displaying reduced cobalt-binding affinity, is significantly elevated in ischemic patients, and the albumin cobalt-binding (ACB) assay can measure its level indirectly. Elucidating the molecular mechanism underlying the identity of IMA and the ACB assay hinges on understanding metal-binding properties of albumin. Albumin binds most metal ions and harbours four primary metal binding sites: site A, site B, the N-terminal site (NTS), and the free thiol at Cys34. Previous efforts to clarify the identity of IMA and the causes for its reduced cobalt-binding capacity were focused on the NTS site, but the degree of N-terminal modification could not be correlated to the presence of ischemia. More recent work suggested that Co2+ ions as used in the ACB assay bind preferentially to site B, then to site A, and finally to the NTS. This insight paved the way for a new consistent molecular basis of the ACB assay: albumin is also the main plasma carrier for free fatty acids (FFAs), and binding of a fatty acid to the high-affinity site FA2 results in conformational changes in albumin which prevent metal binding at site A and partially at site B. Thus, this review advances the hypothesis that high IMA levels in myocardial ischemia and many other conditions originate from high plasma FFA levels hampering the binding of Co2+ to sites A and/or B. This is supported by biophysical studies and the co-association of a range of pathological conditions with positive ACB assays and high plasma FFA levels.
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Affiliation(s)
| | - Kondwani G H Katundu
- School of Medicine, University of St Andrews, St Andrews, United Kingdom; College of Medicine, University of Malawi, Blantyre, Malawi
| | - Amélie I S Sobczak
- School of Medicine, University of St Andrews, St Andrews, United Kingdom
| | - Swati Arya
- School of Medicine, University of St Andrews, St Andrews, United Kingdom
| | | | - Alan J Stewart
- School of Medicine, University of St Andrews, St Andrews, United Kingdom.
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13
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Jomova K, Lawson M, Drostinova L, Lauro P, Poprac P, Brezova V, Michalik M, Lukes V, Valko M. Protective role of quercetin against copper(II)-induced oxidative stress: A spectroscopic, theoretical and DNA damage study. Food Chem Toxicol 2017; 110:340-350. [PMID: 29107026 DOI: 10.1016/j.fct.2017.10.042] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Revised: 10/24/2017] [Accepted: 10/25/2017] [Indexed: 01/27/2023]
Abstract
The radical scavenging and metal chelating properties of flavonoids indicate that they may play a protective role in diseases with perturbed metal homeostasis such as Alzheimer's disease. In this work we investigated the effect of the coordination of quercetin to copper(II) in view of the formation of ROS in Cu-catalyzed Fenton reaction. ABTS and DPPH assays confirmed that the copper(II)-quercetin complex exhibits a stronger radical scavenging activity than does quercetin alone. EPR spin trapping experiments have shown that chelation of quercetin to copper significantly suppressed the formation of hydroxyl radicals in the Cu(II)-Fenton reaction. DNA damage experiments revealed a protective effect for quercetin, but only at higher stoichiometric ratios of quercetin relative to copper. DNA protective effect of quercetin against ROS attack was described by two mechanisms. The first mechanism lies in suppressed formation of ROS due to the decreased catalytic action of copper in the Fenton reaction, as a consequence of its chelation and direct scavenging of ROS by free quercetin. Since the Cu-quercetin complex intercalates into DNA, the second mechanism was attributed to a suppressed intercalating ability of the Cu-quercetin complex due to the mildly intercalating free quercetin into DNA, thus creating a protective wall against stronger intercalators.
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Affiliation(s)
- Klaudia Jomova
- Department of Chemistry, Faculty of Natural Sciences, Constantine the Philosopher University, 949 74 Nitra, Slovakia
| | - Michael Lawson
- Department of Chemistry, Faculty of Natural Sciences, Constantine the Philosopher University, 949 74 Nitra, Slovakia
| | - Lenka Drostinova
- Department of Chemistry, Faculty of Natural Sciences, Constantine the Philosopher University, 949 74 Nitra, Slovakia
| | - Peter Lauro
- Department of Chemistry, Faculty of Natural Sciences, Constantine the Philosopher University, 949 74 Nitra, Slovakia
| | - Patrik Poprac
- Faculty of Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia
| | - Vlasta Brezova
- Faculty of Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia
| | - Martin Michalik
- Faculty of Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia
| | - Vladimir Lukes
- Faculty of Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia
| | - Marian Valko
- Faculty of Chemical and Food Technology, Slovak University of Technology, 812 37 Bratislava, Slovakia.
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14
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Prosser KE, Chang SW, Saraci F, Le PH, Walsby CJ. Anticancer copper pyridine benzimidazole complexes: ROS generation, biomolecule interactions, and cytotoxicity. J Inorg Biochem 2017; 167:89-99. [DOI: 10.1016/j.jinorgbio.2016.11.006] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 10/12/2016] [Accepted: 11/03/2016] [Indexed: 12/19/2022]
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15
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Targeting copper(II)-induced oxidative stress and the acetylcholinesterase system in Alzheimer's disease using multifunctional tacrine-coumarin hybrid molecules. J Inorg Biochem 2016; 161:52-62. [DOI: 10.1016/j.jinorgbio.2016.05.001] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2016] [Revised: 04/17/2016] [Accepted: 05/04/2016] [Indexed: 12/12/2022]
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16
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Jackson GE, Elmagbari FM, Hammouda AN, Bonomo RP. Solution equilibria and the X-ray structure of Cu(ii) complexation with 3-amino-N-(pyridin-2-ylmethyl)propanamide, a pseudo-mimic of human serum albumin. Dalton Trans 2016; 45:17010-17019. [DOI: 10.1039/c6dt02974d] [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
Copper complexes have anti-inflammatory activity in the treatment of inflammation associated with rheumatoid arthritis (RA).
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17
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Chen Q, Wang MM, Hu X, Chen XW, Wang JH. An octamolybdate-metal organic framework hybrid for the efficient adsorption of histidine-rich proteins. J Mater Chem B 2016; 4:6812-6819. [DOI: 10.1039/c6tb02090a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Incorporation of octamolybdate (Mo8O26) into the metal–organic framework, MIL-101(Cr), produces a novel hybrid. The covalent interactions of the Mo8O26 moiety in the hybrid with the N-terminal site and the multi-metal binding site of proteins offer favorable adsorption performance towards histidine-rich proteins.
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Affiliation(s)
- Qing Chen
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Meng-Meng Wang
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Xue Hu
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Xu-Wei Chen
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
| | - Jian-Hua Wang
- Research Center for Analytical Sciences
- College of Sciences
- Northeastern University
- Shenyang 110819
- China
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18
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Miguel RB, Petersen PAD, Gonzales-Zubiate FA, Oliveira CC, Kumar N, do Nascimento RR, Petrilli HM, da Costa Ferreira AM. Inhibition of cyclin-dependent kinase CDK1 by oxindolimine ligands and corresponding copper and zinc complexes. J Biol Inorg Chem 2015; 20:1205-17. [PMID: 26411703 DOI: 10.1007/s00775-015-1300-4] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 09/21/2015] [Indexed: 12/11/2022]
Abstract
Oxindolimine-copper(II) and zinc(II) complexes that previously have shown to induce apoptosis, with DNA and mitochondria as main targets, exhibit here significant inhibition of kinase CDK1/cyclin B protein. Copper species are more active than the corresponding zinc, and the free ligand shows to be less active, indicating a major influence of coordination in the process, and a further modulation by the coordinated ligand. Molecular docking and classical molecular dynamics provide a better understanding of the effectiveness and kinase inhibition mechanism by these compounds, showing that the metal complex provides a stronger interaction than the free ligand with the ATP-binding site. The metal ion introduces charge in the oxindole species, giving it a more rigid conformation that then becomes more effective in its interactions with the protein active site. Analogous experiments resulted in no significant effect regarding phosphatase inhibition. These results can explain the cytotoxicity of these metal complexes towards different tumor cells, in addition to its capability of binding to DNA, and decreasing membrane potential of mitochondria.
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Affiliation(s)
- Rodrigo Bernardi Miguel
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo, SP, 05508-000, Brazil
| | - Philippe Alexandre Divina Petersen
- Departamento de Física dos Materiais e Mecânica, Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R 187, São Paulo, 05508-090, SP, Brazil
| | - Fernando A Gonzales-Zubiate
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Av. Prof. Lineu Prestes 748, São Paulo, 05508-000, SP, Brazil
| | - Carla Columbano Oliveira
- Departamento de Bioquímica, Instituto de Química, Universidade de São Paulo, São Paulo, Av. Prof. Lineu Prestes 748, São Paulo, 05508-000, SP, Brazil
| | - Naresh Kumar
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo, SP, 05508-000, Brazil
| | - Rafael Rodrigues do Nascimento
- Departamento de Física dos Materiais e Mecânica, Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R 187, São Paulo, 05508-090, SP, Brazil
| | - Helena Maria Petrilli
- Departamento de Física dos Materiais e Mecânica, Instituto de Física, Universidade de São Paulo, Rua do Matão, Travessa R 187, São Paulo, 05508-090, SP, Brazil.
| | - Ana Maria da Costa Ferreira
- Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, Av. Prof. Lineu Prestes 748, São Paulo, SP, 05508-000, Brazil.
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19
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Valko M, Jomova K, Rhodes CJ, Kuča K, Musílek K. Redox- and non-redox-metal-induced formation of free radicals and their role in human disease. Arch Toxicol 2015; 90:1-37. [DOI: 10.1007/s00204-015-1579-5] [Citation(s) in RCA: 535] [Impact Index Per Article: 59.4] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2015] [Accepted: 08/11/2015] [Indexed: 02/07/2023]
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20
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Reactivity of dinuclear copper(II) complexes towards melanoma cells: Correlation with its stability, tyrosinase mimicking and nuclease activity. J Inorg Biochem 2015; 149:49-58. [DOI: 10.1016/j.jinorgbio.2015.05.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 05/08/2015] [Accepted: 05/11/2015] [Indexed: 12/29/2022]
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21
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Evidence of two oxidation states of copper during aggregation of hen egg white lysozyme (HEWL). Int J Biol Macromol 2015; 76:1-9. [DOI: 10.1016/j.ijbiomac.2015.02.014] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Revised: 02/13/2015] [Accepted: 02/13/2015] [Indexed: 11/18/2022]
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22
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Synthesis, crystal structure, spectroscopic properties and potential biological activities of salicylate‒neocuproine ternary copper(II) complexes. Molecules 2015; 20:2115-37. [PMID: 25633337 PMCID: PMC6272241 DOI: 10.3390/molecules20022115] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Accepted: 01/22/2015] [Indexed: 11/17/2022] Open
Abstract
Mixed ligand copper(II) complexes containing derivatives of salicylic acid and heterocyclic ligands with nitrogen donor atoms have been the subject of various studies and reviews. In this paper, synthesis and characterization of the ternary copper(II) complexes of neocuproine (2,9-dimethyl-1,10-phenanthroline, Neo) and salicylate ligands (Sal) are reported. In addition, the crystal structures of ([Cu(H2O)(5-Cl-Sal)(Neo)] (1), [Cu(μ-Sal)(Neo)]2 (2), Cu2(μ-5-Cl-Sal)(5-Cl-HSal)2(Neo)2]·EtOH (3)) were determined. In order to compare structural and biological properties of the prepared complexes, spectroscopic and biological studies were performed. Results of X-ray diffraction show that prepared complexes form three types of crystal structures in a given system: monomeric, dimeric and dinuclear complex. The preliminary study on the DNA cleavage activity has shown that the complexes under study behave as the chemical nucleases in the presence of added hydrogen peroxide with slight differences in the activity (1 > 2 > 3). The complexes 1 and 2 exhibited nuclease activity itself indicating the interaction of complexes with the DNA. It has been proposed that the enhanced destructive effect of the complexes 1 and 2 on the DNA is a result of two possible mechanisms of action: (i) the conversion of closed circular DNA (form I) to the nicked DNA (form II) caused by the copper complex itself and (ii) damage of DNA by Reactive Oxygen Species (ROS)-products of the interaction of copper with hydrogen peroxide by means of Fenton reaction (hydroxyl radicals). Thus the biological activity of the prepared Cu(II) complexes containing derivatives of salicylic acid and phenanthroline molecules is substantiated by two independent mechanisms. While derivatives of salicylic acids in the coordination sphere of copper complexes are responsible for radical-scavenging activity (predominantly towards superoxide radical anion), the presence of chelating ligand 2,9-dimethyl-1,10-phenanthroline significantly enhances capability of Cu(II) complexes binding to DNA via intercalation.
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23
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Bobeničová M, Valko M, Brezová V, Dvoranová D. UVA generated free radicals in irinotecan (CPT-11) in the presence of copper ions. J Photochem Photobiol A Chem 2014. [DOI: 10.1016/j.jphotochem.2014.06.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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24
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Katkar P, Coletta A, Castelli S, Sabino GL, Couto RAA, Ferreira AMDC, Desideri A. Effect of oxindolimine copper(II) and zinc(II) complexes on human topoisomerase I activity. Metallomics 2014; 6:117-25. [PMID: 24172750 DOI: 10.1039/c3mt00099k] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ability of oxindolimine copper(II) and zinc(II) complexes, known to have antitumor activity, to inhibit human topoisomerase IB has been tested through enzymatic kinetic assays and molecular docking simulations. These copper and zinc compounds are able to inhibit remarkably the cleavage reaction and only partially the religation step, the copper compound being more efficient than the zinc one. A complete inhibition activity of the cleavage is only obtained when the enzyme is pre-incubated with the compound, the inhibition being irreversible and reversible for the copper and zinc compounds, respectively. The relative stability of such complexes was estimated by competitive equilibria with human serum albumin (HSA), monitored by CD spectroscopy. The copper species shows a log KCuL = 17.2, while the analogous zinc complex exhibits a log KZnL = 7.2. Molecular docking simulation studies show that the almost square planar geometry of the copper compound allows a direct coordination of the metal with two amino acids (Glu492, Asp563) of the enzyme at variance of the zinc compound which has a more tetrahedral geometry. Altogether, the data indicate that the different coordination geometry achieved by the two transition metal ions has an important role in modulating their efficiency as topoisomerase I inhibitors.
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Affiliation(s)
- Prafulla Katkar
- Dipartimento di Biologia, Università Tor Vergata di Roma, 00173 Roma, Italy.
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25
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Ghosh S, Pandey NK, Banerjee P, Chaudhury K, Nagy NV, Dasgupta S. Copper(II) directs formation of toxic amorphous aggregates resulting in inhibition of hen egg white lysozyme fibrillation under alkaline salt-mediated conditions. J Biomol Struct Dyn 2014; 33:991-1007. [PMID: 24806136 DOI: 10.1080/07391102.2014.921864] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Hen egg white lysozyme (HEWL) adopts a molten globule-like state at high pH (~12.75) and is found to form amyloid fibrils at alkaline pH. Here, we report that Cu(II) inhibits self-association of HEWL at pH 12.75 both at 37 and 65 °C. A significant reduction in Thioflavin T fluorescence intensity, attenuation in β-sheet content and reduction in hydrophobic exposure were observed with increasing Cu(II) stoichiometry. Electron paramagnetic resonance spectroscopy suggests a 4N type of coordination pattern around Cu(II) during fibrillation. Cu(II) is also capable of altering the cytotoxicity of the proteinaceous aggregates. Fibrillar species of diverse morphology were found in the absence of Cu(II) with the generation of amorphous aggregates in the presence of Cu(II), which are more toxic compared to the fibrils alone.
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Affiliation(s)
- Sudeshna Ghosh
- a Department of Chemistry , Indian Institute of Technology , Kharagpur 721302 , India
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26
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Esteves CV, Madureira J, Lima LMP, Mateus P, Bento I, Delgado R. Copper(II) and Gallium(III) Complexes of trans-Bis(2-hydroxybenzyl) Cyclen Derivatives: Absence of a Cross-Bridge Proves Surprisingly More Favorable. Inorg Chem 2014; 53:4371-86. [DOI: 10.1021/ic403156h] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Catarina V. Esteves
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República 2780−157 Oeiras, Portugal
| | - Joana Madureira
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República 2780−157 Oeiras, Portugal
| | - Luís M. P. Lima
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República 2780−157 Oeiras, Portugal
| | - Pedro Mateus
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República 2780−157 Oeiras, Portugal
| | - Isabel Bento
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República 2780−157 Oeiras, Portugal
| | - Rita Delgado
- Instituto de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República 2780−157 Oeiras, Portugal
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27
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Gala L, Lawson M, Jomova K, Zelenicky L, Congradyova A, Mazur M, Valko M. EPR spectroscopy of a clinically active (1:2) copper(II)-histidine complex used in the treatment of Menkes disease: a Fourier transform analysis of a fluid CW-EPR spectrum. Molecules 2014; 19:980-91. [PMID: 24434671 PMCID: PMC6271212 DOI: 10.3390/molecules19010980] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Revised: 12/23/2013] [Accepted: 12/26/2013] [Indexed: 11/16/2022] Open
Abstract
Redox active transition metal ions (e.g., iron and copper) have been implicated in the etiology of many oxidative stress-related diseases including also neurodegenerative disorders. Unbound copper can catalyze formation of reactive oxygen species (hydroxyl radicals) via Fenton reaction/Haber–Weiss chemistry and therefore, under physiological conditions, free copper is potentially toxic and very rarely exists inside cells. Copper(II) bound to the aminoacid l-histidine represents a species discovered in blood in the mid 60s and since then extensive research on this complex was carried out. Copper bound to l-histidine represents an exchangeable pool of copper(II) in equilibrium with the most abundant blood plasma protein, human serum albumin. The structure of this complex, in aqueous solution, has been a subject of many studies and reviews, however without convincing success. The significance of the (1:2) copper(II)-l-histidine complex at physiological pH documents its therapeutic applications in the treatment of Menkes disease and more recently in the treatment of infantile hypertrophic cardioencephalomyopathy. While recently the (1:2) Cu(II)-l-His complex has been successfully crystallized and the crystal structure was solved by X-ray diffraction, the structure of the complex in fluid solution at physiological pH is not satisfactorily known. The aim of this paper is to study the (1:2) Cu(II)-l-histidine complex at low temperatures by X-band and S-band EPR spectroscopy and at physiological pH at room temperature by Fourier transform CW-EPR spectroscopy.
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Affiliation(s)
- Lukas Gala
- Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava SK-812 37, Slovakia.
| | - Michael Lawson
- Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava SK-812 37, Slovakia.
| | - Klaudia Jomova
- Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava SK-812 37, Slovakia.
| | - Lubomir Zelenicky
- Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava SK-812 37, Slovakia.
| | - Andrea Congradyova
- Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava SK-812 37, Slovakia.
| | - Milan Mazur
- Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava SK-812 37, Slovakia.
| | - Marian Valko
- Faculty of Chemical and Food Technology, Slovak Technical University, Bratislava SK-812 37, Slovakia.
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28
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Kato R, Akiyama M, Kawakami H, Komatsu T. Superoxide dismutase activity of the naturally occurring human serum albumin-copper complex without hydroxyl radical formation. Chem Asian J 2013; 9:83-6. [PMID: 24227376 DOI: 10.1002/asia.201301285] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2013] [Indexed: 11/09/2022]
Abstract
The superoxide radical anion (O2(.-)) is biologically toxic and contributes to the pathogenesis of various diseases. Here we describe the superoxide dismutase (SOD) activity of human serum albumin (HSA) complexed with a single Cu(II) ion at the N-terminal end (HSA-Cu complex). The structure of this naturally occurring copper-coordinated blood serum protein has been characterized by several physicochemical measurements. The O2(.-) dismutation ability of the HSA-Cu (1:1) complex is almost the same as that of the well-known SOD mimics, such as Mn(III) -tetrakis(N-methylpyridinium)porphyrin. Interestingly, the HSA-Cu complex does not induce a subsequent Fenton reaction to produce the hydroxyl radical (OH(.)), which is one of the most harmful reactive oxygen species.
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Affiliation(s)
- Ryunosuke Kato
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551 (Japan), Fax: (+81) 3-3817-1910
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29
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Jomova K, Valko M. Health protective effects of carotenoids and their interactions with other biological antioxidants. Eur J Med Chem 2013; 70:102-10. [PMID: 24141200 DOI: 10.1016/j.ejmech.2013.09.054] [Citation(s) in RCA: 125] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 09/26/2013] [Accepted: 09/29/2013] [Indexed: 10/26/2022]
Abstract
Carotenoids are natural pigments attracting attention of physicists, chemists and biologists due to their multiple functions in the nature. While carotenoids have unusually high extinction coefficients, they do not exhibit adequate emission. This fact has resulted in detailed studies of photophysical and photochemical properties of carotenoids and their role as light-harvesting pigments in photosynthesis. Carotenoids are abundantly present in fruits and vegetables and are considered as important species with beneficial effect on human health by decreasing the risk of various diseases, particularly decreasing the incidence of cancers and eye disease. More trials are needed to ascertain the role of carotenoids in prevention of cardiovascular disease and metabolic disease. Carotenoids effectively scavenge peroxyl radicals and act predominantly as antioxidants. However, under conditions of increased concentration of oxygen and carotenoid concentration, beta-carotene was found to exhibit prooxidant behaviour. Photophysical properties of carotenoids and conditions affecting a switch between antioxidant and prooxidant behaviour of carotenoids are the main aims of this review. In addition, the localization of carotenoids in biological membranes, their interactions and reactions with ascorbic acid (vitamin C) and alpha-tocopherol (vitamin E) as well as their redox potentials are discussed in view of their antioxidant properties as beneficial species in preventing various diseases.
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Affiliation(s)
- Klaudia Jomova
- Department of Chemistry, Faculty of Natural Sciences, Constantine The Philosopher University, SK-949 74 Nitra, Slovakia
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30
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Pandey NK, Ghosh S, Nagy NV, Dasgupta S. Fibrillation of human serum albumin shows nonspecific coordination on stoichiometric increment of Copper(II). J Biomol Struct Dyn 2013; 32:1366-78. [DOI: 10.1080/07391102.2013.819300] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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31
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Esteves CV, Lamosa P, Delgado R, Costa J, Désogère P, Rousselin Y, Goze C, Denat F. Remarkable Inertness of Copper(II) Chelates of Cyclen-Based Macrobicycles with Two trans-N-Acetate Arms. Inorg Chem 2013; 52:5138-53. [DOI: 10.1021/ic400015v] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Catarina V. Esteves
- Instituto
de Tecnologia Química e Biológica, Universidade Nova
de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Pedro Lamosa
- Instituto
de Tecnologia Química e Biológica, Universidade Nova
de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Rita Delgado
- Instituto
de Tecnologia Química e Biológica, Universidade Nova
de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Judite Costa
- iMed.UL, Faculdade de Farmácia,
Universidade de Lisboa, Av. Prof. Gama Pinto, 1649-003 Lisboa, Portugal
| | - Pauline Désogère
- Institut de Chimie Moléculaire
de l’Université de Bourgogne, UMR CNRS 6302, Université
de Bourgogne, 9, Av. Alain Savary, 21078 Dijon, France
| | - Yoann Rousselin
- Institut de Chimie Moléculaire
de l’Université de Bourgogne, UMR CNRS 6302, Université
de Bourgogne, 9, Av. Alain Savary, 21078 Dijon, France
| | - Christine Goze
- Institut de Chimie Moléculaire
de l’Université de Bourgogne, UMR CNRS 6302, Université
de Bourgogne, 9, Av. Alain Savary, 21078 Dijon, France
| | - Franck Denat
- Institut de Chimie Moléculaire
de l’Université de Bourgogne, UMR CNRS 6302, Université
de Bourgogne, 9, Av. Alain Savary, 21078 Dijon, France
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32
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Jiang D, Zhang L, Grant GPG, Dudzik CG, Chen S, Patel S, Hao Y, Millhauser GL, Zhou F. The elevated copper binding strength of amyloid-β aggregates allows the sequestration of copper from albumin: a pathway to accumulation of copper in senile plaques. Biochemistry 2013; 52:547-56. [PMID: 23237523 DOI: 10.1021/bi301053h] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Copper coexists with amyloid-β (Aβ) peptides at a high concentration in the senile plaques of Alzheimer's disease (AD) patients and has been linked to oxidative damage associated with AD pathology. However, the origin of copper and the driving force behind its accumulation are unknown. We designed a sensitive fluorescent probe, Aβ(1-16)(Y10W), by substituting the tyrosine residue at position 10 in the hydrophilic domain of Aβ(1-42) with tryptophan. Upon mixing Cu(II), Aβ(1-16)(Y10W), and aliquots of Aβ(1-42) taken from samples incubated for different lengths of time, we found that the Cu(II) binding strength of aggregated Aβ(1-42) has been elevated by more than 2 orders of magnitude with respect to that of monomeric Aβ(1-42). Electron paramagnetic spectroscopic measurements revealed that the Aβ(1-42) aggregates, unlike their monomeric form, can seize copper from human serum albumin, an abundant copper-containing protein in brain and cerebrospinal fluid. The significantly elevated binding strength of the Aβ(1-42) aggregates can be rationalized by a Cu(II) coordination sphere constituted by three histidines from two adjacent Aβ(1-42) molecules. Our work demonstrates that the copper binding affinity of Aβ(1-42) is dependent on its aggregation state and provides new insight into how and why senile plaques accumulate copper in vivo.
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Affiliation(s)
- Dianlu Jiang
- Department of Chemistry and Biochemistry, California State University, Los Angeles, Los Angeles, CA 90032, USA
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33
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Silveira VC, Abbott MP, Cavicchioli M, Gonçalves MB, Petrilli HM, de Rezende L, Amaral AT, Fonseca DEP, Caramori GF, da Costa Ferreira AM. Peculiar reactivity of a di-imine copper(ii) complex regarding its binding to albumin protein. Dalton Trans 2013; 42:6386-96. [DOI: 10.1039/c3dt00108c] [Citation(s) in RCA: 16] [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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34
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Esteves CV, Lima LMP, Mateus P, Delgado R, Brandão P, Félix V. Cyclen derivatives with two trans-methylnitrophenolic pendant arms: a structural study of their copper(ii) and zinc(ii) complexes. Dalton Trans 2013; 42:6149-60. [DOI: 10.1039/c2dt32363j] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Catarina V Esteves
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
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35
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Tanner P, Ezhevskaya M, Nehring R, Van Doorslaer S, Meier W, Palivan C. Specific His6-tag Attachment to Metal-Functionalized Polymersomes Relies on Molecular Recognition. J Phys Chem B 2012; 116:10113-24. [DOI: 10.1021/jp305544v] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Pascal Tanner
- Department of Physical Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel,
Switzerland
| | - Maria Ezhevskaya
- Spectroscopy
in Biophysics and
Catalysis (SIBAC), Department of Physics, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Rainer Nehring
- Department of Physical Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel,
Switzerland
| | - Sabine Van Doorslaer
- Spectroscopy
in Biophysics and
Catalysis (SIBAC), Department of Physics, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium
| | - Wolfgang Meier
- Department of Physical Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel,
Switzerland
| | - Cornelia Palivan
- Department of Physical Chemistry, University of Basel, Klingelbergstrasse 80, 4056 Basel,
Switzerland
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36
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Lima LMP, Esteban-Gómez D, Delgado R, Platas-Iglesias C, Tripier R. Monopicolinate Cyclen and Cyclam Derivatives for Stable Copper(II) Complexation. Inorg Chem 2012; 51:6916-27. [DOI: 10.1021/ic300784v] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Luís M. P. Lima
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences
et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest
Cedex 3, France
- Instituto
de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - David Esteban-Gómez
- Departamento de Química
Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña,
Spain
| | - Rita Delgado
- Instituto
de Tecnologia Química
e Biológica, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Carlos Platas-Iglesias
- Departamento de Química
Fundamental, Universidade da Coruña, Campus da Zapateira, Rúa da Fraga 10, 15008 A Coruña,
Spain
| | - Raphaël Tripier
- Université de Bretagne Occidentale, UMR-CNRS 6521, UFR des Sciences
et Techniques, 6 avenue Victor le Gorgeu, C.S. 93837, 29238 Brest
Cedex 3, France
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37
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Correia I, Jakusch T, Cobbinna E, Mehtab S, Tomaz I, Nagy NV, Rockenbauer A, Pessoa JC, Kiss T. Evaluation of the binding of oxovanadium(IV) to human serum albumin. Dalton Trans 2012; 41:6477-87. [PMID: 22476413 DOI: 10.1039/c2dt12193j] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The understanding of the biotransformations of insulin mimetic vanadium complexes in human blood and its transport to target cells is an essential issue in the development of more effective drugs. We present the study of the interaction of oxovanadium(iv) with human serum albumin (HSA) by electron paramagnetic resonance (EPR), circular dichroism (CD) and visible absorption spectroscopy. Metal competition studies were done using Cu(II) and Zn(II) as metal probes. The results show that V(IV)O occupies two types of binding sites in albumin, which compete not only with each other, but also with hydrolysis of the metal ion. In one of the sites the resulting V(IV)O-HSA complex has a weak visible CD signal and its X-band EPR spectrum may be easily measured. This was assigned to amino acid side chains of the ATCUN site. The other binding site shows stronger signals in the CD in the visible range, but has a hardly measurable EPR signal; it is assigned to the multi metal binding site (MBS) of HSA. Studies with fatted and defatted albumin show the complexity of the system since conformational changes, induced by the binding of fatty acids, decrease the ability of V(IV)O to bind albumin. The possibility and importance of ternary complex formation between V(IV)O, HSA and several drug candidates - maltol (mal), picolinic acid (pic), 2-hydroxypyridine-N-oxide (hpno) and 1,2-dimethyl-3-hydroxy-4(1H)-pyridinone (dhp) was also evaluated. In the presence of maltol the CD and EPR spectra significantly change, indicating the formation of ternary VO-HSA-maltol complexes. Modeling studies with amino acids and peptides were used to propose binding modes. Based on quantitative RT EPR measurements and CD data, it was concluded that in the systems with mal, pic, hpno, and dhp (V(IV)OL(2))(n)(HSA) species form, where the maximum value for n is at least 6 (mal, pic). The degree of formation of the ternary species, corresponding to the reaction V(IV)OL(2) + HSA -->/<-- V(IV)OL(2)(HSA) is hpno > pic ≥ mal > dhp. (V(IV)OL)(n)(HSA) type complexes are detected exclusively with pic. Based on the spectroscopic studies we propose that in the (V(IV)OL(2))(n)(HSA) species the protein bounds to vanadium through the histidine side chains.
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Affiliation(s)
- Isabel Correia
- Centro de Química Estrutural, Instituto Superior Técnico, Lisbon, Portugal
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38
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Early stage aggregation of human serum albumin in the presence of metal ions. Int J Biol Macromol 2011; 49:337-42. [DOI: 10.1016/j.ijbiomac.2011.05.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2011] [Revised: 05/12/2011] [Accepted: 05/16/2011] [Indexed: 11/19/2022]
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39
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Aquilanti G, Giorgetti M, Minicucci M, Papini G, Pellei M, Tegoni M, Trasatti A, Santini C. A study on the coordinative versatility of new N,S-donor macrocyclic ligands: XAFS, and Cu2+ complexation thermodynamics in solution. Dalton Trans 2011; 40:2764-77. [DOI: 10.1039/c0dt01401j] [Citation(s) in RCA: 34] [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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40
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Munteanu G, Dempsey E, McCormac T. Novel ultrasensitive and ultrafast voltammetric determination of biological aminochromes on the copper nanodoped mercury monolayer carbon fiber electrode. J Electroanal Chem (Lausanne) 2010. [DOI: 10.1016/j.jelechem.2010.08.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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41
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Pandey NK, Ghosh S, Dasgupta S. Fibrillation in human serum albumin is enhanced in the presence of copper(II). J Phys Chem B 2010; 114:10228-33. [PMID: 20684647 DOI: 10.1021/jp103876p] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aggregation process in proteins is governed by several factors such as temperature, pH, presence of electrolytes, denaturants, and metal ions. Here, we report the role of Cu(II) in inducing rapid fibrillation in human serum albumin. We have monitored this process via UV-vis spectroscopy, fluorescence spectroscopy, circular dichroism, zeta-potential measurements, electron paramagnetic resonance studies, fluorescence microscopy, and field emission scanning electron microscopy. Images show a fibrillar network of human serum albumin in the presence of Cu(II) in 60% ethanol incubated at 65 degrees C at physiological pH. All other studies also support the enhanced fibrillation in presence of Cu(II).
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Affiliation(s)
- Nitin K Pandey
- Department of Chemistry, Indian Institute of Technology, Kharagpur 721302, India
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42
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Boulton S, Anderson A, Swalwell H, Henderson JR, Manning P, Birch-Machin MA. Implications of using the fluorescent probes, dihydrorhodamine 123 and 2′,7′-dichlorodihydrofluorescein diacetate, for the detection of UVA-induced reactive oxygen species. Free Radic Res 2010; 45:139-46. [DOI: 10.3109/10715762.2010.517751] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Sokołowska M, Pawlas K, Bal W. Effect of common buffers and heterocyclic ligands on the binding of Cu(II) at the multimetal binding site in human serum albumin. Bioinorg Chem Appl 2010; 2010:725153. [PMID: 20467459 PMCID: PMC2864911 DOI: 10.1155/2010/725153] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Accepted: 02/16/2010] [Indexed: 11/18/2022] Open
Abstract
Visible-range circular dichroism titrations were used to study Cu(II) binding properties of Multimetal Binding Site (MBS) of Human Serum Albumin (HSA). The formation of ternary MBS-Cu(II)-Buffer complexes at pH 7.4 was positively verified for sodium phosphate, Tris, and Hepes, the three most common biochemical buffers. The phosphate > Hepes > Tris order of affinities, together with strong spectral changes induced specifically by Tris, indicates the presence of both Buffer-Cu(II) and Buffer-HSA interactions. All complexes are strong enough to yield a nearly 100% ternary complex formation in 0.5 mM HSA dissolved in 100 mM solutions of respective buffers. The effects of warfarin and ibuprofen, specific ligands of hydrophobic pockets I and II in HSA on the Cu(II) binding to MBS were also investigated. The effects of ibuprofen were negligible, but warfarin diminished the MBS affinity for Cu(II) by a factor of 20, as a result of indirect conformational effects. These results indicate that metal binding properties of MBS can be modulated directly and indirectly by small molecules.
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Affiliation(s)
- Magdalena Sokołowska
- Department of Hygiene, Wrocław Medical University, Mikulicza-Radeckiego 7, 50-345 Wrocław, Poland
| | - Krystyna Pawlas
- Department of Hygiene, Wrocław Medical University, Mikulicza-Radeckiego 7, 50-345 Wrocław, Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
- Central Institute for Labour Protection-National Research Institute, Czerniakowska 16, 00-701 Warsaw, Poland
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da Silveira VC, Caramori GF, Abbott MP, Gonçalves MB, Petrilli HM, da Costa Ferreira AM. Oxindole-Schiff base copper(II) complexes interactions with human serum albumin: Spectroscopic, oxidative damage, and computational studies. J Inorg Biochem 2009; 103:1331-41. [DOI: 10.1016/j.jinorgbio.2009.05.015] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Revised: 05/22/2009] [Accepted: 05/25/2009] [Indexed: 12/20/2022]
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Moncol J, Maroszova J, Koman M, Melnik M, Valko M, Mazur M, Lis T. Self-assembly of hydrogen-bonded supramolecular structures of two copper(II) 2-bromobenzoate complexes with 4-pyridylmethanol and nicotinamide. J COORD CHEM 2008. [DOI: 10.1080/00958970802146031] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Jan Moncol
- a Institute of Inorganic Chemistry, Technology and Materials, Slovak, Technical University , Radlinského 9, SK-812 37, Bratislava, Slovakia
| | - Jaroslava Maroszova
- a Institute of Inorganic Chemistry, Technology and Materials, Slovak, Technical University , Radlinského 9, SK-812 37, Bratislava, Slovakia
| | - Marian Koman
- a Institute of Inorganic Chemistry, Technology and Materials, Slovak, Technical University , Radlinského 9, SK-812 37, Bratislava, Slovakia
| | - Milan Melnik
- a Institute of Inorganic Chemistry, Technology and Materials, Slovak, Technical University , Radlinského 9, SK-812 37, Bratislava, Slovakia
| | - Marian Valko
- b Institute of Physical Chemistry and Chemical Physics, Slovak, Technical University , Radlinského 9, SK-812 37, Bratislava, Slovakia
| | - Milan Mazur
- b Institute of Physical Chemistry and Chemical Physics, Slovak, Technical University , Radlinského 9, SK-812 37, Bratislava, Slovakia
| | - Tadeusz Lis
- c Faculty of Chemistry , University of Wrocław , 14 Joliot-Curie St, 50-383, Wrocław, Poland
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Heli H, Sattarahmady N, Jabbari A, Moosavi-Movahedi A, Hakimelahi G, Tsai FY. Adsorption of human serum albumin onto glassy carbon surface – Applied to albumin-modified electrode: Mode of protein–ligand interactions. J Electroanal Chem (Lausanne) 2007. [DOI: 10.1016/j.jelechem.2007.07.005] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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47
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Hanaki A, Odani A. Transport of Cu(II) from an albumin mimic peptide, GlyGlyHisGly, to histidine and penicillamine. J Inorg Biochem 2007; 101:1428-37. [PMID: 17643491 DOI: 10.1016/j.jinorgbio.2007.05.014] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2006] [Revised: 05/23/2007] [Accepted: 05/23/2007] [Indexed: 11/25/2022]
Abstract
Cu in blood has been believed to transport into cell via albumin and some amino acids. To shed light on the Cu transport process we studied the reaction of the Cu(II)-peptide with the amino acid by absorption and CD spectra. Albumin mimic peptides GlyGly-L-HisGly (GGHG) and penta-Gly(G5) formed stable 4N coordinated Cu(II) complexes, but in the reaction with histidine (His) and penicillamine (Pes) the ternary Cu(II) complex formations were observed different by the kinetic study. Cu(II)-G5 complexes reacted with Pes to form the ternary complex Cu(H(-1)G5)(Pes(-)) which was subsequently transformed to the binary complex Cu(Pes(-))(2). In the system with GGHG the Cu(II) was also transported from GGHG to Pes, but the ternary Cu(H(-1)GGHG)(Pes(-)) complex as the intermediate was detected a trace. The ternary complex would be spontaneously transformed to Cu(Pes(-))(2) upon forming, because the rate constant of the ternary complex formation k(1+)= approximately 2M(-1)s(-1) was less than k(2+)= approximately 5 x 10(2)M(-1)s(-1) for the Cu(Pes(-))(2) formation at physiological pH. In the Cu(II)-GGHG-His system the ternary Cu(H(-1)GGHG)(His) complex was also hardly identified because the formation constant K(1) and k(1+) were very small and the equilibrium existed between Cu(H(-2)GGHG) and Cu(His)(2) and its overall equilibrium constant beta(2) for Cu(His)(2) was very small to be 1.00+/-0.05 M(-1) at pH 9.0. These results indicated that the ternary complex is formed in the Cu transport process from the albumin to the amino acid, but His imidazole nitrogen in the fourth-binding site of Cu(II) strongly resists the replacement by the incoming ligand.
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Affiliation(s)
- Akira Hanaki
- National Institute of Radiological Sciences, Anagawa 4-9-1, Chiba 263-8555, Japan
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48
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Crystal structures and spectroscopic behavior of monomeric, dimeric and polymeric copper(II) chloroacetate adducts with isonicotinamide, N-methylnicotinamide and N,N-diethylnicotinamide. Inorganica Chim Acta 2007. [DOI: 10.1016/j.ica.2007.03.027] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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49
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Rózga M, Sokołowska M, Protas AM, Bal W. Human serum albumin coordinates Cu(II) at its N-terminal binding site with 1 pM affinity. J Biol Inorg Chem 2007; 12:913-8. [PMID: 17516096 DOI: 10.1007/s00775-007-0244-8] [Citation(s) in RCA: 114] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2007] [Accepted: 05/01/2007] [Indexed: 10/23/2022]
Abstract
The conditional stability constant at pH 7.4 for Cu(II) binding at the N-terminal site (NTS) of human serum albumin (HSA) was determined directly by competitive UV-vis spectroscopy titrations using nitrilotriacetic acid (NTA) as the competitor in 100 mM NaCl and 100 mM N-(2-hydroxyethyl)piperazine-N'-ethanesulfonic acid (Hepes). The log Kc (NTS) value of 12.0 +/- 0.1 was determined for HSA dissolved in 100 mM NaCl. A false log log Kc (NTS) (c) value of 11.4 +/- 0.1 was obtained in the 100 mM Hepes buffer, owing to the formation of a ternary Cu(NTA)(Hepes) complex. The impact of the picomolar affinity of HSA for Cu(II) on the availability of these ions in neurodegenerative disorders is briefly discussed.
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Affiliation(s)
- Małgorzata Rózga
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland
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A new Dawson-like polyoxotungstate {SbW18O60} encapsulating a pyramidal SbO3 group within a {W18} cluster cage. INORG CHEM COMMUN 2007. [DOI: 10.1016/j.inoche.2007.01.025] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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