151
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Anion inhibitors of the β-carbonic anhydrase from the pathogenic bacterium responsible of tularemia, Francisella tularensis. Bioorg Med Chem 2017; 25:4800-4804. [PMID: 28754318 DOI: 10.1016/j.bmc.2017.07.033] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Revised: 05/29/2017] [Accepted: 07/15/2017] [Indexed: 11/21/2022]
Abstract
A β-class carbonic anhydrase (CA, EC 4.2.1.1) from the pathogenic bacterium Francisella tularensis (FtuβCA) was cloned and purified, and the anion inhibition profile was investigated. Based on the measured kinetic parameters for the enzyme catalyzed CO2 hydration reaction (kcat of 9.8×105s-1 and a kcat/KM of 8.9×107M-1s-1), FtuβCA is a highly effective enzyme. The activity of FtuβCA was not inhibited by a range of anions that do not typically coordinate Zn(II) effectively, including perchlorate, tetrafluoroborate, and hexafluorophosphate. Surprisingly, some anions which generally complex well with many cations, including Zn(II), also did not effectively inhibit FtuβCA, e.g., fluoride, cyanide, azide, nitrite, bisulphite, sulfate, tellurate, perrhenate, perrhuthenate, and peroxydisulfate. However, the most effective inhibitors were in the range of 90-94µM (sulfamide, sulfamic acid, phenylarsonic and phenylboronic acid). N,N-Diethyldithiocarbamate (KI of 0.31mM) was a moderately potent inhibitor. As Francisella tularensis is the causative agent of tularemia, the discovery of compounds that can interfere with the life cycle of this pathogen may result in novel opportunities to fight antibiotic drug resistance.
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152
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Nguyen M, Meunier B, Robert A. Catechol-Based Ligands as Potential Metal Chelators Inhibiting Redox Activity in Alzheimer's Disease. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700385] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Michel Nguyen
- Laboratoire de Chimie de Coordination du CNRS, 2; 05 route de Narbonne, BP 44099 31077 Toulouse cedex 4 France
| | - Bernard Meunier
- Laboratoire de Chimie de Coordination du CNRS, 2; 05 route de Narbonne, BP 44099 31077 Toulouse cedex 4 France
- School of Chemical Engineering and Light Industry; Guangdong University of Technology (GDUT); Higher Education Mega Center; 100 Waihuan Xi road 510006 Guangzhou Panyu District P. R. China
| | - Anne Robert
- Laboratoire de Chimie de Coordination du CNRS, 2; 05 route de Narbonne, BP 44099 31077 Toulouse cedex 4 France
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153
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Mujika JI, Rodríguez-Guerra Pedregal J, Lopez X, Ugalde JM, Rodríguez-Santiago L, Sodupe M, Maréchal JD. Elucidating the 3D structures of Al(iii)-Aβ complexes: a template free strategy based on the pre-organization hypothesis. Chem Sci 2017; 8:5041-5049. [PMID: 28970891 PMCID: PMC5613242 DOI: 10.1039/c7sc01296a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 05/04/2017] [Indexed: 12/31/2022] Open
Abstract
Senile plaques are extracellular deposits found in patients with Alzheimer's Disease (AD) and are mainly formed by insoluble fibrils of β-amyloid (Aβ) peptides. The mechanistic details about how AD develops are not fully understood yet, but metals such as Cu, Zn, or Fe are proposed to have a non-innocent role. Many studies have also linked the non biological metal aluminum with AD, a species whose concentration in the environment and food has been constantly increasing since the industrial revolution. Gaining a molecular picture of how Al(iii) interacts with an Aβ peptide is of fundamental interest to improve understanding of the many variables in the evolution of AD. So far, no consensus has been reached on how this metal interacts with Aβ, partially due to the experimental complexity of detecting and quantifying the resulting Al(iii)-Aβ complexes. Computational chemistry arises as a powerful alternative to investigate how Al(iii) can interact with Aβ peptides, as suitable strategies could shed light on the metal-peptide description at the molecular level. However, the absence of any reliable template that could be used for the modeling of the metallopeptide structure makes computational insight extremely difficult. Here, we present a novel strategy to generate accurate 3D models of the Al(iii)-Aβ complexes, which still circumvents first principles simulations of metal binding to peptides of Aβ. The key to this approach lies in the identification of experimental structures of the isolated peptide that are favourably pre-organized for the binding of a given metal in configurations of the first coordination sphere that were previously identified as the most stable with amino acid models. This approach solves the problem of the absence of clear structural templates for novel metallopeptide constructs. The posterior refinement of the structures via QM/MM and MD calculations allows us to provide, for the first time, physically sound models for Al(iii)-Aβ complexes with a 1 : 1 stoichiometry, where up to three carboxylic groups are involved in the metal binding, with a clear preference towards Glu3, Asp7, and Glu11.
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Affiliation(s)
- Jon I Mujika
- Kimika Fakultatea , Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) , 20080 Donostia , Euskadi , Spain .
| | | | - Xabier Lopez
- Kimika Fakultatea , Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) , 20080 Donostia , Euskadi , Spain .
| | - Jesus M Ugalde
- Kimika Fakultatea , Euskal Herriko Unibertsitatea (UPV/EHU) and Donostia International Physics Center (DIPC) , 20080 Donostia , Euskadi , Spain .
| | | | - Mariona Sodupe
- Departament de Química , Universitat Autònoma de Barcelona , Bellaterra 08193 , Spain .
| | - Jean-Didier Maréchal
- Departament de Química , Universitat Autònoma de Barcelona , Bellaterra 08193 , Spain .
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154
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Abstract
Aggregation of the amyloid-β (Aβ) peptide is strongly correlated with Alzheimer's disease (AD). Recent research has improved our understanding of the kinetics of amyloid fibril assembly and revealed new details regarding different stages in plaque formation. Presently, interest is turning toward studying this process in a holistic context, focusing on cellular components which interact with the Aβ peptide at various junctures during aggregation, from monomer to cross-β amyloid fibrils. However, even in isolation, a multitude of factors including protein purity, pH, salt content, and agitation affect Aβ fibril formation and deposition, often producing complicated and conflicting results. The failure of numerous inhibitors in clinical trials for AD suggests that a detailed examination of the complex interactions that occur during plaque formation, including binding of carbohydrates, lipids, nucleic acids, and metal ions, is important for understanding the diversity of manifestations of the disease. Unraveling how a variety of key macromolecular modulators interact with the Aβ peptide and change its aggregation properties may provide opportunities for developing therapies. Since no protein acts in isolation, the interplay of these diverse molecules may differentiate disease onset, progression, and severity, and thus are worth careful consideration.
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Affiliation(s)
- Katie L Stewart
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, UK.
| | - Sheena E Radford
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, University of Leeds, Leeds, LS2 9JT, UK.
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155
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Xie B, Liu F, Dong X, Wang Y, Liu XM, Sun Y. Modulation effect of acidulated human serum albumin on Cu 2+ -mediated amyloid β-protein aggregation and cytotoxicity under a mildly acidic condition. J Inorg Biochem 2017; 171:67-75. [DOI: 10.1016/j.jinorgbio.2017.03.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2016] [Revised: 02/10/2017] [Accepted: 03/19/2017] [Indexed: 12/31/2022]
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156
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Ji Y, Lee HJ, Kim M, Nam G, Lee SJC, Cho J, Park CM, Lim MH. Strategic Design of 2,2′-Bipyridine Derivatives to Modulate Metal–Amyloid-β Aggregation. Inorg Chem 2017; 56:6695-6705. [DOI: 10.1021/acs.inorgchem.7b00782] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | | | | | | | | | - Jaeheung Cho
- Department of Emerging Materials
Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu 42988, Republic of Korea
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157
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Grasso GI, Bellia F, Arena G, Satriano C, Vecchio G, Rizzarelli E. Multitarget trehalose-carnosine conjugates inhibit Aβ aggregation, tune copper(II) activity and decrease acrolein toxicity. Eur J Med Chem 2017; 135:447-457. [PMID: 28475972 DOI: 10.1016/j.ejmech.2017.04.060] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 04/06/2017] [Accepted: 04/22/2017] [Indexed: 01/12/2023]
Abstract
Increasing evidence is accumulating, showing that neurodegenerative disorders are somehow associated with the toxicity of amyloid aggregates, metal ion dyshomeostasis as well as with products generated by oxidative stress. Within the biological oxidation products, acrolein does have a prominent role. A promising strategy to deal with the above neurogenerative disorders is to use multi-functions bio-molecules. Herein, we show how a class of bio-conjugates takes advantage of the antiaggregating, antioxidant and antiglycating properties of trehalose and carnosine. Their ability to sequester acrolein and to inhibit both self- and metal-induced aggregation is here reported. The copper(II) coordination properties of a new trehalose-carnosine conjugate and the relative antioxidant effects have also been investigated.
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Affiliation(s)
- Giuseppa Ida Grasso
- Institute of Biostructure and Bioimaging, National Research Council (CNR), via P. Gaifami 18, 95126, Catania, Italy.
| | - Francesco Bellia
- Institute of Biostructure and Bioimaging, National Research Council (CNR), via P. Gaifami 18, 95126, Catania, Italy.
| | - Giuseppe Arena
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125, Catania, Italy
| | - Cristina Satriano
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125, Catania, Italy
| | - Graziella Vecchio
- Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125, Catania, Italy
| | - Enrico Rizzarelli
- Institute of Biostructure and Bioimaging, National Research Council (CNR), via P. Gaifami 18, 95126, Catania, Italy; Department of Chemical Sciences, University of Catania, Viale A. Doria 6, 95125, Catania, Italy
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158
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Kennedy RH, Wiqas A, Curley JP. Evidence for mast cell-mediated zinc homeostasis: Increased labile zinc in the hippocampus of mast-cell deficient mice. Neurosci Lett 2017; 650:139-145. [PMID: 28445769 DOI: 10.1016/j.neulet.2017.04.037] [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: 03/24/2017] [Accepted: 04/20/2017] [Indexed: 10/19/2022]
Abstract
The dentate gyrus of the hippocampus is a site of adult neurogenesis, and is also known to contain one of the highest concentrations of labile brain zinc (Zn), thought to aid in learning and memory by supporting neurogenesis. At the same time, it is known that unbound Zn, when present at excessive levels, decreases the formation of new neurons. Since mast cells contain Zn transporters capable of moving this essential element across their plasma membrane, as well as Zn-rich granules that are dispelled upon secretion, we reasoned that mast cells contribute to Zn homeostasis in this area of the brain, as they are found in greatest numbers in and around the dentate gyrus. This line of evidence was tested by comparing Timm-stained hippocampal sections of mast cell-deficient C57BL/6-KitW-sh/W-sh (Sash-/-) mice to those of mast cell-containing wild type (Sash+/+) animals. Mast cell deficient mice were found to have significantly increased Timm-positive staining as compared to controls, reflecting an increase in labile or bioactive Zn in this region. As we observed no change in total brain Zn (protein-bound plus unbound Zn), these increases indicate that mast cells may serve to bind what would otherwise be excessive or deleterious levels of labile Zn, or that they are able to recruit metallothionein proteins. Because elevated levels of labile Zn are observed in the brains of patients with neurodegenerative diseases such as Alzheimer's, the potential contribution of mast cells to these diseases remains a compelling one. Overall, these data support a role for mast cells in either establishing or maintaining Zn homeostasis in the brain in the service of health, while Zn dysregulation has the potential to reduce learning, memory, and ultimately organismal survival.
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Affiliation(s)
- Rachel H Kennedy
- Department of Psychology, Columbia University, New York, NY, USA; Department of Science, Bard Early College-Manhattan, New York, NY, USA.
| | - Amen Wiqas
- Department of Psychology, Barnard College, New York, NY, USA.
| | - James P Curley
- Department of Psychology, Columbia University, New York, NY, USA; Center for Integrative Animal Behavior, Columbia University, New York, NY, USA.
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159
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Guo J, Yu L, Sun Y, Dong X. Kinetic Insights into Zn2+-Induced Amyloid β-Protein Aggregation Revealed by Stopped-Flow Fluorescence Spectroscopy. J Phys Chem B 2017; 121:3909-3917. [DOI: 10.1021/acs.jpcb.6b12187] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Jingjing Guo
- Department of Biochemical
Engineering and Key Laboratory of Systems Bioengineering of the Ministry
of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Linling Yu
- Department of Biochemical
Engineering and Key Laboratory of Systems Bioengineering of the Ministry
of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Yan Sun
- Department of Biochemical
Engineering and Key Laboratory of Systems Bioengineering of the Ministry
of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
| | - Xiaoyan Dong
- Department of Biochemical
Engineering and Key Laboratory of Systems Bioengineering of the Ministry
of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
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160
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Walke GR, Ranade DS, Ramteke SN, Rapole S, Satriano C, Rizzarelli E, Tomaselli GA, Trusso Sfrazzetto G, Kulkarni PP. Fluorescent Copper Probe Inhibiting Aβ1-16-Copper(II)-Catalyzed Intracellular Reactive Oxygen Species Production. Inorg Chem 2017; 56:3729-3732. [PMID: 28318262 DOI: 10.1021/acs.inorgchem.6b02915] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A variety of fluorescent probes are proposed to monitor the intracellular copper content. So far, none of the probes have been evaluated for their potential to inhibit copper-associated intracellular oxidative stress. Herein, we studied the ability of a fluorescent copper probe, OBEP-CS1, to inhibit intracellular oxidative stress associated with an amyloid β (Aβ) peptide-copper complex. The data showed that OBEP-CS1 completely inhibits the copper-catalyzed oxidation as well as decarboxylation/deamination of Aβ1-16. Moreover, the cell imaging experiments confirmed that OBEP-CS1 can inhibit Aβ-CuII-catalyzed reactive oxygen species production in SH-SY5Y cells. We also demonstrated that Aβ1-16 peptide can bind intracellular copper and thereby exert oxidative stress.
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Affiliation(s)
- Gulshan R Walke
- Bioprospecting Group, Agharkar Research Institute , Pune, India
| | | | | | - Srikanth Rapole
- Proteomics Laboratory, National Centre for Cell Science (NCCS), University of Pune Campus , Pune, India
| | - Cristina Satriano
- Department of Chemical Sciences, University of Catania , Viale Andrea Doria 6, 95125 Catania, Italy.,Consorzio Interuniversitario di Ricerca in Chimica dei Metalli nei Sistemi Biologici , via Celso Ulpiani, 27, 70125 Bari, Italy
| | - Enrico Rizzarelli
- Department of Chemical Sciences, University of Catania , Viale Andrea Doria 6, 95125 Catania, Italy.,Consorzio Interuniversitario di Ricerca in Chimica dei Metalli nei Sistemi Biologici , via Celso Ulpiani, 27, 70125 Bari, Italy.,Institute of Biostructures and Bioimages, National Council of Research , Via P. Gaifami 18, 95126 Catania, Italy
| | - Gaetano A Tomaselli
- Department of Chemical Sciences, University of Catania , Viale Andrea Doria 6, 95125 Catania, Italy
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161
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Conte-Daban A, Borghesani V, Sayen S, Guillon E, Journaux Y, Gontard G, Lisnard L, Hureau C. Link between Affinity and Cu(II) Binding Sites to Amyloid-β Peptides Evaluated by a New Water-Soluble UV-Visible Ratiometric Dye with a Moderate Cu(II) Affinity. Anal Chem 2017; 89:2155-2162. [PMID: 28208266 PMCID: PMC5714188 DOI: 10.1021/acs.analchem.6b04979] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Being able to easily determine the Cu(II) affinity for biomolecules of moderate affinity is important. Such biomolecules include amyloidogenic peptides, such as the well-known amyloid-β peptide involved in Alzheimer's disease. Here, we report the synthesis of a new water-soluble ratiometric Cu(II) dye with a moderate affinity (109 M-1 at pH 7.1) and the characterizations of the Cu(II) corresponding complex by X-ray crystallography, EPR, and XAS spectroscopic methods. UV-vis competition was performed on the Aβ peptide as well as on a wide series of modified peptides, leading to an affinity value of 1.6 × 109 M-1 at pH 7.1 for the Aβ peptide and to a coordination model for the Cu(II) site within the Aβ peptide that agrees with the one mostly accepted currently.
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Affiliation(s)
- Amandine Conte-Daban
- CNRS; LCC (Laboratoire de Chimie de Coordination) ; 205, route de Narbonne, F-31077 Toulouse, France. Université de Toulouse; UPS, INPT ; LCC ; F-31077 Toulouse, France
| | - Valentina Borghesani
- CNRS; LCC (Laboratoire de Chimie de Coordination) ; 205, route de Narbonne, F-31077 Toulouse, France. Université de Toulouse; UPS, INPT ; LCC ; F-31077 Toulouse, France
| | - Stéphanie Sayen
- Université de Reims Champagne Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), UMR 7312 CNRS-URCA, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
| | - Emmanuel Guillon
- Université de Reims Champagne Ardenne, Institut de Chimie Moléculaire de Reims (ICMR), UMR 7312 CNRS-URCA, Moulin de la Housse, BP 1039, 51687 Reims Cedex 2, France
| | - Yves Journaux
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM, F-75005, Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005, Paris, France
| | - Geoffrey Gontard
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM, F-75005, Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005, Paris, France
| | - Laurent Lisnard
- Sorbonne Universités, UPMC Univ. Paris 06, UMR 8232, IPCM, F-75005, Paris, France
- CNRS, UMR 8232, Institut Parisien de Chimie Moléculaire, F-75005, Paris, France
| | - Christelle Hureau
- CNRS; LCC (Laboratoire de Chimie de Coordination) ; 205, route de Narbonne, F-31077 Toulouse, France. Université de Toulouse; UPS, INPT ; LCC ; F-31077 Toulouse, France
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162
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Liao Q, Owen MC, Olubiyi OO, Barz B, Strodel B. Conformational Transitions of the Amyloid-β Peptide Upon Copper(II) Binding and pH Changes. Isr J Chem 2017. [DOI: 10.1002/ijch.201600108] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Qinghua Liao
- Institute of Complex Systems: Structural Biochemistry (ICS-6); Forschungszentrum Jülich GmbH; 52425 Jülich Germany
| | - Michael C. Owen
- Institute of Complex Systems: Structural Biochemistry (ICS-6); Forschungszentrum Jülich GmbH; 52425 Jülich Germany
| | - Olujide O. Olubiyi
- Department of Pharmacology and Therapeutics; College of Medicine and Health Sciences; Afe Babalola University; Nigeria
| | - Bogdan Barz
- Institute of Complex Systems: Structural Biochemistry (ICS-6); Forschungszentrum Jülich GmbH; 52425 Jülich Germany
- Institute of Theoretical and Computational Chemistry; Heinrich Heine University Düsseldorf; 40225 Düsseldorf Germany
| | - Birgit Strodel
- Institute of Complex Systems: Structural Biochemistry (ICS-6); Forschungszentrum Jülich GmbH; 52425 Jülich Germany
- Institute of Theoretical and Computational Chemistry; Heinrich Heine University Düsseldorf; 40225 Düsseldorf Germany
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163
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Gerber H, Wu F, Dimitrov M, Garcia Osuna GM, Fraering PC. Zinc and Copper Differentially Modulate Amyloid Precursor Protein Processing by γ-Secretase and Amyloid-β Peptide Production. J Biol Chem 2017; 292:3751-3767. [PMID: 28096459 DOI: 10.1074/jbc.m116.754101] [Citation(s) in RCA: 58] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Revised: 01/13/2017] [Indexed: 11/06/2022] Open
Abstract
Recent evidence suggests involvement of biometal homeostasis in the pathological mechanisms in Alzheimer's disease (AD). For example, increased intracellular copper or zinc has been linked to a reduction in secreted levels of the AD-causing amyloid-β peptide (Aβ). However, little is known about whether these biometals modulate the generation of Aβ. In the present study we demonstrate in both cell-free and cell-based assays that zinc and copper regulate Aβ production by distinct molecular mechanisms affecting the processing by γ-secretase of its Aβ precursor protein substrate APP-C99. We found that Zn2+ induces APP-C99 dimerization, which prevents its cleavage by γ-secretase and Aβ production, with an IC50 value of 15 μm Importantly, at this concentration, Zn2+ also drastically raised the production of the aggregation-prone Aβ43 found in the senile plaques of AD brains and elevated the Aβ43:Aβ40 ratio, a promising biomarker for neurotoxicity and AD. We further demonstrate that the APP-C99 histidine residues His-6, His-13, and His-14 control the Zn2+-dependent APP-C99 dimerization and inhibition of Aβ production, whereas the increased Aβ43:Aβ40 ratio is substrate dimerization-independent and involves the known Zn2+ binding lysine Lys-28 residue that orientates the APP-C99 transmembrane domain within the lipid bilayer. Unlike zinc, copper inhibited Aβ production by directly targeting the subunits presenilin and nicastrin in the γ-secretase complex. Altogether, our data demonstrate that zinc and copper differentially modulate Aβ production. They further suggest that dimerization of APP-C99 or the specific targeting of individual residues regulating the production of the long, toxic Aβ species, may offer two therapeutic strategies for preventing AD.
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Affiliation(s)
- Hermeto Gerber
- From the Foundation Eclosion, CH-1228 Plan-Les-Ouates, and Campus Biotech Innovation Park, CH-1202 Geneva, Switzerland.,the Brain Mind Institute and School of Life Sciences, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland.,the Department of Biology, University of Fribourg, CH-1700 Fribourg, Switzerland, and
| | - Fang Wu
- the Brain Mind Institute and School of Life Sciences, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland.,the Key Laboratory of Systems Biomedicine, Ministry of Education, Shanghai Center for Systems Biomedicine, Shanghai Jiao Tong University, 200240 Shanghai, China
| | - Mitko Dimitrov
- the Brain Mind Institute and School of Life Sciences, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
| | - Guillermo M Garcia Osuna
- the Brain Mind Institute and School of Life Sciences, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
| | - Patrick C Fraering
- From the Foundation Eclosion, CH-1228 Plan-Les-Ouates, and Campus Biotech Innovation Park, CH-1202 Geneva, Switzerland, .,the Brain Mind Institute and School of Life Sciences, Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland
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164
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Kang J, Lee SJC, Nam JS, Lee HJ, Kang MG, Korshavn KJ, Kim HT, Cho J, Ramamoorthy A, Rhee HW, Kwon TH, Lim MH. An Iridium(III) Complex as a Photoactivatable Tool for Oxidation of Amyloidogenic Peptides with Subsequent Modulation of Peptide Aggregation. Chemistry 2017; 23:1645-1653. [PMID: 27862428 DOI: 10.1002/chem.201604751] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2016] [Indexed: 02/03/2023]
Abstract
Aggregates of amyloidogenic peptides are involved in the pathogenesis of several degenerative disorders. Herein, an iridium(III) complex, Ir-1, is reported as a chemical tool for oxidizing amyloidogenic peptides upon photoactivation and subsequently modulating their aggregation pathways. Ir-1 was rationally designed based on multiple characteristics, including 1) photoproperties leading to excitation by low-energy radiation; 2) generation of reactive oxygen species responsible for peptide oxidation upon photoactivation under mild conditions; and 3) relatively easy incorporation of a ligand on the IrIII center for specific interactions with amyloidogenic peptides. Biochemical and biophysical investigations illuminate that the oxidation of representative amyloidogenic peptides (i.e., amyloid-β, α-synuclein, and human islet amyloid polypeptide) is promoted by light-activated Ir-1, which alters the conformations and aggregation pathways of the peptides. Additionally, their potential oxidation sites are identified as methionine, histidine, or tyrosine residues. Overall, our studies on Ir-1 demonstrate the feasibility of devising metal complexes as chemical tools suitable for elucidating the nature of amyloidogenic peptides at the molecular level, as well as controlling their aggregation.
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Affiliation(s)
- Juhye Kang
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Shin Jung C Lee
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Jung Seung Nam
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Hyuck Jin Lee
- School of Life Sciences, UNIST, Ulsan, 44919, Republic of Korea
| | - Myeong-Gyun Kang
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Kyle J Korshavn
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Hyun-Tak Kim
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Jaeheung Cho
- Department of Emerging Materials Science, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, 42988, Republic of Korea
| | - Ayyalusamy Ramamoorthy
- Department of Chemistry, University of Michigan, Ann Arbor, MI, 48109, USA.,Biophysics, University of Michigan, Ann Arbor, MI, 48109, USA
| | - Hyun-Woo Rhee
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Tae-Hyuk Kwon
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
| | - Mi Hee Lim
- Department of Chemistry, Ulsan National Institute of Science and Technology (UNIST), Ulsan, 44919, Republic of Korea
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165
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Mukherjee S, Ghosh C, Seal M, Dey SG. Copper induced spin state change of heme–Aβ associated with Alzheimer's disease. Dalton Trans 2017; 46:13171-13175. [DOI: 10.1039/c7dt01700f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Binding of Cu(ii) not only drives the conversion of the benign bis-His bound low spin heme(iii)–Aβ complex to the detrimental mono-His high spin form, even in the presence of excess Aβ, but it also forms the most toxic heme(iii)–Cu(ii)–Aβ species.
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Affiliation(s)
- Soumya Mukherjee
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata
- India 700032
| | - Chandradeep Ghosh
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata
- India 700032
| | - Manas Seal
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata
- India 700032
| | - Somdatta Ghosh Dey
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata
- India 700032
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166
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Wallin C, Luo J, Jarvet J, Wärmländer SKTS, Gräslund A. The Amyloid-β Peptide in Amyloid Formation Processes: Interactions with Blood Proteins and Naturally Occurring Metal Ions. Isr J Chem 2016. [DOI: 10.1002/ijch.201600105] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Cecilia Wallin
- Department of Biochemistry and Biophysics; Arrhenius Laboratories; Stockholm University; 10691 Stockholm Sweden
| | - Jinghui Luo
- Department of Biochemistry and Biophysics; Arrhenius Laboratories; Stockholm University; 10691 Stockholm Sweden
- Chemical Research Laboratory; University of Oxford; 12 Mansfield Road Oxford Ox 1 3TA UK
| | - Jüri Jarvet
- Department of Biochemistry and Biophysics; Arrhenius Laboratories; Stockholm University; 10691 Stockholm Sweden
- The National Institute of Chemical Physics and Biophysics; Tallinn Estonia
| | | | - Astrid Gräslund
- Department of Biochemistry and Biophysics; Arrhenius Laboratories; Stockholm University; 10691 Stockholm Sweden
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167
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Kim D, Baik SH, Kang S, Cho SW, Bae J, Cha MY, Sailor MJ, Mook-Jung I, Ahn KH. Close Correlation of Monoamine Oxidase Activity with Progress of Alzheimer's Disease in Mice, Observed by in Vivo Two-Photon Imaging. ACS CENTRAL SCIENCE 2016; 2:967-975. [PMID: 28058286 PMCID: PMC5200925 DOI: 10.1021/acscentsci.6b00309] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Indexed: 05/26/2023]
Abstract
Monoamine oxidases (MAOs) play an important role in Alzheimer's disease (AD) pathology. We report in vivo comonitoring of MAO activity and amyloid-β (Aβ) plaques dependent on the aging of live mice with AD, using a two-photon fluorescence probe. The probe under the catalytic action of MAO produces a dipolar fluorophore that senses Aβ plaques, a general AD biomarker, enabling us to comonitor the enzyme activity and the progress of AD indicated by Aβ plaques. The results show that the progress of AD has a close correlation with MAO activity, which can be categorized into three stages: slow initiation stage up to three months, an aggressive stage, and a saturation stage from nine months. Histological analysis also reveals elevation of MAO activity around Aβ plaques in aged mice. The close correlation between the MAO activity and AD progress observed by in vivo monitoring for the first time prompts us to investigate the enzyme as a potential biomarker of AD.
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Affiliation(s)
- Dokyoung Kim
- Department
of Chemistry, Pohang University of Science
and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyungbuk 37673, Republic
of Korea
- Department
of Chemistry and Biochemistry, University
of California, San Diego, La Jolla, California 92093, United States
| | - Sung Hoon Baik
- Department
of Biochemistry and Biomedical Sciences, College of Medicine, Seoul National University, 103 Daehak-Ro, Jongro-Gu, Seoul 110-799, Republic
of Korea
| | - Seokjo Kang
- Department
of Biochemistry and Biomedical Sciences, College of Medicine, Seoul National University, 103 Daehak-Ro, Jongro-Gu, Seoul 110-799, Republic
of Korea
| | - Seo Won Cho
- Department
of Chemistry, Pohang University of Science
and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyungbuk 37673, Republic
of Korea
| | - Juryang Bae
- Department
of Chemistry, Pohang University of Science
and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyungbuk 37673, Republic
of Korea
| | - Moon-Yong Cha
- Department
of Biochemistry and Biomedical Sciences, College of Medicine, Seoul National University, 103 Daehak-Ro, Jongro-Gu, Seoul 110-799, Republic
of Korea
| | - Michael J. Sailor
- Department
of Chemistry and Biochemistry, University
of California, San Diego, La Jolla, California 92093, United States
| | - Inhee Mook-Jung
- Department
of Biochemistry and Biomedical Sciences, College of Medicine, Seoul National University, 103 Daehak-Ro, Jongro-Gu, Seoul 110-799, Republic
of Korea
| | - Kyo Han Ahn
- Department
of Chemistry, Pohang University of Science
and Technology (POSTECH), 77 Cheongam-Ro, Nam-Gu, Pohang, Gyungbuk 37673, Republic
of Korea
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168
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Wallin C, Kulkarni YS, Abelein A, Jarvet J, Liao Q, Strodel B, Olsson L, Luo J, Abrahams JP, Sholts SB, Roos PM, Kamerlin SCL, Gräslund A, Wärmländer SKTS. Characterization of Mn(II) ion binding to the amyloid-β peptide in Alzheimer's disease. J Trace Elem Med Biol 2016; 38:183-193. [PMID: 27085215 DOI: 10.1016/j.jtemb.2016.03.009] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2016] [Accepted: 03/17/2016] [Indexed: 12/28/2022]
Abstract
Growing evidence links neurodegenerative diseases to metal exposure. Aberrant metal ion concentrations have been noted in Alzheimer's disease (AD) brains, yet the role of metals in AD pathogenesis remains unresolved. A major factor in AD pathogenesis is considered to be aggregation of and amyloid formation by amyloid-β (Aβ) peptides. Previous studies have shown that Aβ displays specific binding to Cu(II) and Zn(II) ions, and such binding has been shown to modulate Aβ aggregation. Here, we use nuclear magnetic resonance (NMR) spectroscopy to show that Mn(II) ions also bind to the N-terminal part of the Aβ(1-40) peptide, with a weak binding affinity in the milli- to micromolar range. Circular dichroism (CD) spectroscopy, solid state atomic force microscopy (AFM), fluorescence spectroscopy, and molecular modeling suggest that the weak binding of Mn(II) to Aβ may not have a large effect on the peptide's aggregation into amyloid fibrils. However, identification of an additional metal ion displaying Aβ binding reveals more complex AD metal chemistry than has been previously considered in the literature.
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Affiliation(s)
- Cecilia Wallin
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden
| | - Yashraj S Kulkarni
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, 751 24 Uppsala, Sweden
| | - Axel Abelein
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden; Department of Neurobiology, Care Sciences and Society (NVS), H1, Division of Neurogeriatrics, Karolinska Institutet, Novum Pl 5 14157 Huddinge, Stockholm, Sweden
| | - Jüri Jarvet
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden; The National Institute of Chemical Physics and Biophysics, Akadeemia tee 23, 12618 Tallinn, Estonia
| | - Qinghua Liao
- Institute of Complex Systems: Structural Biochemistry, Forschungszentrum Jülich, Jülich, 52425, Germany
| | - Birgit Strodel
- Institute of Complex Systems: Structural Biochemistry, Forschungszentrum Jülich, Jülich, 52425, Germany; Institute of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
| | - Lisa Olsson
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden
| | - Jinghui Luo
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden; Chemical Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, UK
| | - Jan Pieter Abrahams
- Biozentrum, University of Basel, Klingelbergstrasse 70, 4056 Basel, Switzerland; Laboratory of Biomolecular Research, Paul Scherrer Institute, Department of Biology and Chemistry, OFLC/102CH-5232 Villigen PSI, Switzerland
| | - Sabrina B Sholts
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden; Department of Anthropology, National Museum of Natural History, Smithsonian Institution, 10th and Constitution Avenue NW, Washington, DC 20013, USA
| | - Per M Roos
- Institute of Environmental Medicine, Karolinska Institutet, Nobels väg 13, 171 77 Stockholm, Sweden; Department of Clinical Physiology, Capio St.Göran Hospital, St.Göransplan 1, 112 19 Stockholm, Sweden
| | - Shina C L Kamerlin
- Department of Cell and Molecular Biology, Uppsala University, Husargatan 3, 751 24 Uppsala, Sweden
| | - Astrid Gräslund
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden
| | - Sebastian K T S Wärmländer
- Department of Biochemistry and Biophysics, Stockholm University, Svante Arrhenius väg 16C, 106 91 Stockholm, Sweden.
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169
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Santos MA, Chand K, Chaves S. Recent progress in multifunctional metal chelators as potential drugs for Alzheimer's disease. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.04.013] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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170
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Hecel A, De Ricco R, Valensin D. Influence of membrane environments and copper ions on the structural features of amyloidogenic proteins correlated to neurodegeneration. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.06.018] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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171
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Pirota V, Dell'Acqua S, Monzani E, Nicolis S, Casella L. Copper-Aβ Peptides and Oxidation of Catecholic Substrates: Reactivity and Endogenous Peptide Damage. Chemistry 2016; 22:16964-16973. [PMID: 27735097 DOI: 10.1002/chem.201603824] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Indexed: 11/08/2022]
Abstract
The oxidative reactivity of copper complexes with Aβ peptides 1-16 and 1-28 (Aβ16 and Aβ28) against dopamine and related catechols under physiological conditions has been investigated in parallel with the competitive oxidative modification undergone by the peptides. It was found that both Aβ16 and Aβ28 markedly increase the oxidative reactivity of copper(II) towards the catechol compounds, up to a molar ratio of about 4:1 of peptide/copper(II). Copper redox cycling during the catalytic activity induces the competitive modification of the peptide at selected amino acid residues. The main modifications consist of oxidation of His13/14 to 2-oxohistidine and Phe19/20 to ortho-tyrosine, and the formation of a covalent His6-catechol adduct. Competition by the endogenous peptide is rather efficient, as approximately one peptide molecule is oxidized every 10 molecules of 4-methylcatechol.
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Affiliation(s)
- Valentina Pirota
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Simone Dell'Acqua
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Enrico Monzani
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Stefania Nicolis
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
| | - Luigi Casella
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, 27100, Pavia, Italy
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172
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Magrì A, Tabbì G, Giuffrida A, Pappalardo G, Satriano C, Naletova I, Nicoletti VG, Attanasio F. Influence of the N-terminus acetylation of Semax, a synthetic analog of ACTH(4-10), on copper(II) and zinc(II) coordination and biological properties. J Inorg Biochem 2016; 164:59-69. [PMID: 27586814 DOI: 10.1016/j.jinorgbio.2016.08.013] [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: 03/31/2016] [Revised: 08/23/2016] [Accepted: 08/25/2016] [Indexed: 10/21/2022]
Abstract
Semax is a heptapeptide (Met-Glu-His-Phe-Pro-Gly-Pro) that encompasses the sequence 4-7 of N-terminal domain of the adrenocorticotropic hormone and a C-terminal Pro-Gly-Pro tripeptide. N-terminal amino group acetylation (Ac-Semax) modulates the chemical and biological properties of parental peptide, modifying the ability of Semax to form complex species with Cu(II) ion. At physiological pH, the main complex species formed by Ac-Semax, [CuLH-2]2-, consists in a distorted CuN3O chromophore with a weak apical interaction of the methionine sulphur. Such a complex differs from the Cu(II)-Semax complex system, which exhibits a CuN4 chromophore. The reduced ligand field affects the [CuLH-2]2- formal redox potential, which is more positive than that of Cu(II)-Semax corresponding species. In the amino-free form, the resulting complex species is redox-stable and unreactive against ascorbic acid, unlike the acetylated form. Semax acetylation did not protect from Cu(II) induced toxicity on a SH-SY5Y neuroblastoma cell line, thus demonstrating the crucial role played by the free NH2 terminus in the cell protection. Since several brain diseases are associated either to Cu(II) or Zn(II) dyshomeostasis, here we characterized also the complex species formed by Zn(II) with Semax and Ac-Semax. Both peptides were able to form Zn(II) complex species with comparable strength. Confocal microscopy imaging confirmed that peptide group acetylation does not affect the Zn(II) influx in neuroblastoma cells. Moreover, a punctuate distribution of Zn(II) within the cells suggests a preferred subcellular localization that might explain the zinc toxic effect. A future perspective can be the use of Ac-Semax as ionophore in antibody drug conjugates to produce a dysmetallostasis in tumor cells.
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Affiliation(s)
- Antonio Magrì
- Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale delle Ricerche (CNR), Via P. Gaifami 18, 95126 Catania, Italy
| | - Giovanni Tabbì
- Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale delle Ricerche (CNR), Via P. Gaifami 18, 95126 Catania, Italy.
| | - Alessandro Giuffrida
- Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale delle Ricerche (CNR), Via P. Gaifami 18, 95126 Catania, Italy
| | - Giuseppe Pappalardo
- Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale delle Ricerche (CNR), Via P. Gaifami 18, 95126 Catania, Italy
| | - Cristina Satriano
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Irina Naletova
- Dipartimento di Scienze Biomediche, Università degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy; Consorzio Interuniversitario C.I.R.C.S.M.B., Via C. Ulpiani 27, 70125 Bari, Italy
| | - Vincenzo G Nicoletti
- Dipartimento di Scienze Biomediche, Università degli Studi di Catania, Viale A. Doria 6, 95125 Catania, Italy
| | - Francesco Attanasio
- Istituto di Biostrutture e Bioimmagini, Consiglio Nazionale delle Ricerche (CNR), Via P. Gaifami 18, 95126 Catania, Italy.
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173
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Girvan P, Miyake T, Teng X, Branch T, Ying L. Kinetics of the Interactions between Copper and Amyloid-β with FAD Mutations and Phosphorylation at the N terminus. Chembiochem 2016; 17:1732-7. [PMID: 27356100 PMCID: PMC5096041 DOI: 10.1002/cbic.201600255] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Indexed: 12/27/2022]
Abstract
Mutations and post‐translational modifications of amyloid‐β (Aβ) peptide in its N terminus have been shown to increase fibril formation, yet the molecular mechanism is not clear. Here we investigated the kinetics of the interactions of copper with two Aβ peptides containing Familial Alzheimer's disease (FAD) mutations (English (H6R) and Tottori (D7N)), as well as with Aβ peptide phosphorylated at serine 8 (pS8). All three peptides bind to copper with a similar rate as the wild‐type (wt). The dissociation rates follow the order pS8>H6R>wt>D7N; the interconversion between the two coordinating species occurs 50 % faster for H6R and pS8, whereas D7N had only a negligible effect. Interestingly, the rate of ternary complex (copper‐bridged heterodimer) formation for the modified peptides was significantly faster than that for wt, thus leading us to propose that FAD and sporadic AD might share a kinetic origin for the enhanced oligomerisation of Aβ.
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Affiliation(s)
- Paul Girvan
- Institute of Chemical Biology, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.,Department of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Toru Miyake
- Molecular Medicine, National Heart and Lung Institute, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.,Faculty of Medicine, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo, Tokyo, 113-0034, Japan
| | - Xiangyu Teng
- Institute of Chemical Biology, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.,Department of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Thomas Branch
- Institute of Chemical Biology, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.,Department of Chemistry, Imperial College London, Exhibition Road, London, SW7 2AZ, UK
| | - Liming Ying
- Molecular Medicine, National Heart and Lung Institute, Imperial College London, Exhibition Road, London, SW7 2AZ, UK. .,Institute of Chemical Biology, Imperial College London, Exhibition Road, London, SW7 2AZ, UK.
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174
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Gaisin Z, Gellerman G, Meyerstein D. Penta-glycine copper(II) complexes in slightly alkaline solutions. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.05.055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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175
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Amyloid-β containing isoaspartate 7 as potential biomarker and drug target in Alzheimer's disease. MENDELEEV COMMUNICATIONS 2016. [DOI: 10.1016/j.mencom.2016.07.001] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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176
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Tsvetkov PO, Cheglakov IB, Ovsepyan AA, Mediannikov OY, Morozov AO, Telegin GB, Kozin SA. Peripherally Applied Synthetic Tetrapeptides HAEE and RADD Slow Down the Development of Cerebral β-Amyloidosis in AβPP/PS1 Transgenic Mice. J Alzheimers Dis 2016; 46:849-53. [PMID: 26402624 DOI: 10.3233/jad-150031] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Two tetrapeptides, HAEE and RADD, which are ionic-complementary to the primary zinc recognition site of amyloid-β (Aβ), have been reported to inhibit zinc-induced dimerization of the Aβ metal-binding domain and slow Aβ aggregation in vitro. In the present study, we investigate the impact of HAEE and RADD on the development of cerebral β-amyloidosis in a mouse model of Alzheimer's disease. We have found chronic intravenous administration of each peptide results in significant decrease of amyloid plaque burden in the treated mice.
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Affiliation(s)
- Philipp O Tsvetkov
- Aix-Marseille Université, Inserm, CRO2 UMR_S 911, Faculté de Pharmacie, Marseille, France.,The Institute of General Pathology and Pathophysiology, Moscow, Russia
| | - Ivan B Cheglakov
- Branch of Shemyakin and Ovchinnikov Institute of bioorganic chemistry of Russian academy of sciences, Pushchino, Russia
| | - Armen A Ovsepyan
- Branch of Shemyakin and Ovchinnikov Institute of bioorganic chemistry of Russian academy of sciences, Pushchino, Russia
| | | | | | - Georgy B Telegin
- Branch of Shemyakin and Ovchinnikov Institute of bioorganic chemistry of Russian academy of sciences, Pushchino, Russia
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177
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Kepp KP. Alzheimer's disease due to loss of function: A new synthesis of the available data. Prog Neurobiol 2016; 143:36-60. [PMID: 27327400 DOI: 10.1016/j.pneurobio.2016.06.004] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2016] [Revised: 06/10/2016] [Accepted: 06/11/2016] [Indexed: 12/11/2022]
Abstract
Alzheimer's Disease (AD) is a highly complex disease involving a broad range of clinical, cellular, and biochemical manifestations that are currently not understood in combination. This has led to many views of AD, e.g. the amyloid, tau, presenilin, oxidative stress, and metal hypotheses. The amyloid hypothesis has dominated the field with its assumption that buildup of pathogenic β-amyloid (Aβ) peptide causes disease. This paradigm has been criticized, yet most data suggest that Aβ plays a key role in the disease. Here, a new loss-of-function hypothesis is synthesized that accounts for the anomalies of the amyloid hypothesis, e.g. the curious pathogenicity of the Aβ42/Aβ40 ratio, the loss of Aβ caused by presenilin mutation, the mixed phenotypes of APP mutations, the poor clinical-biochemical correlations for genetic variant carriers, and the failure of Aβ reducing drugs. The amyloid-loss view accounts for recent findings on the structure and chemical features of Aβ variants and their coupling to human patient data. The lost normal function of APP/Aβ is argued to be metal transport across neuronal membranes, a view with no apparent anomalies and substantially more explanatory power than the gain-of-function amyloid hypothesis. In the loss-of-function scenario, the central event of Aβ aggregation is interpreted as a loss of soluble, functional monomer Aβ rather than toxic overload of oligomers. Accordingly, new research models and treatment strategies should focus on remediation of the functional amyloid balance, rather than strict containment of Aβ, which, for reasons rationalized in this review, has failed clinically.
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Affiliation(s)
- Kasper P Kepp
- Technical University of Denmark, DTU Chemistry, DK-2800 Kongens Lyngby, Denmark.
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178
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Boopathi S, Kolandaivel P. Fe(2+) binding on amyloid β-peptide promotes aggregation. Proteins 2016; 84:1257-74. [PMID: 27214008 DOI: 10.1002/prot.25075] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Revised: 04/29/2016] [Accepted: 05/08/2016] [Indexed: 01/26/2023]
Abstract
The metal ions Zn(2+) , Cu(2+) , and Fe(2+) play a significant role in the aggregation mechanism of Aβ peptides. However, the nature of binding between metal and peptide has remained elusive; the detailed information on this from the experimental study is very difficult. Density functional theory (dft) (M06-2X/6-311++G (2df,2pd) +LANL2DZ) has employed to determine the force field resulting due to metal and histidine interaction. We performed 200 ns molecular dynamics (MD) simulation on Aβ1-42 -Zn(2+) , Aβ1-42 -Cu(2+) , and Aβ1-42 -Fe(2+) systems in explicit water with different combination of coordinating residues including the three Histidine residues in the N-terminal. The present investigation, the Aβ1-42 -Zn(2+) system possess three turn conformations separated by coil structure. Zn(2+) binding caused the loss of the helical structure of N-terminal residues which transformed into the S-shaped conformation. Zn(2+) has reduced the coil and increases the turn content of the peptide compared with experimental study. On the other hand, the Cu(2+) binds with peptide, β sheet formation is observed at the N-terminal residues of the peptide. Fe(2+) binding is to promote the formation of Glu22-Lys28 salt-bridge which stabilized the turn conformation in the Phe19-Gly25 residues, subsequently β sheets were observed at His13-Lys18 and Gly29-Gly37 residues. The turn conformation facilitates the β sheets are arranged in parallel by enhancing the hydrophobic contact between Gly25 and Met35, Lys16 and Met35, Leu17 and Leu34, Val18 and Leu34 residues. The Fe(2+) binding reduced the helix structure and increases the β sheet content in the peptide, which suggested, Fe(2+) promotes the oligomerization by enhancing the peptide-peptide interaction. Proteins 2016; 84:1257-1274. © 2016 Wiley Periodicals, Inc.
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179
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Rezaei-Ghaleh N, Kumar S, Walter J, Zweckstetter M. Phosphorylation Interferes with Maturation of Amyloid-β Fibrillar Structure in the N Terminus. J Biol Chem 2016; 291:16059-67. [PMID: 27252381 DOI: 10.1074/jbc.m116.728956] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2016] [Indexed: 11/06/2022] Open
Abstract
Neurodegeneration is characterized by the ubiquitous presence of modifications in protein deposits. Despite their potential significance in the initiation and progression of neurodegenerative diseases, the effects of posttranslational modifications on the molecular properties of protein aggregates are largely unknown. Here, we study the Alzheimer disease-related amyloid-β (Aβ) peptide and investigate how phosphorylation at serine 8 affects the structure of Aβ aggregates. Serine 8 is shown to be located in a region of high conformational flexibility in monomeric Aβ, which upon phosphorylation undergoes changes in local conformational dynamics. Using hydrogen-deuterium exchange NMR and fluorescence quenching techniques, we demonstrate that Aβ phosphorylation at serine 8 causes structural changes in the N-terminal region of Aβ aggregates in favor of less compact conformations. Structural changes induced by serine 8 phosphorylation can provide a mechanistic link between phosphorylation and other biological events that involve the N-terminal region of Aβ aggregates. Our data therefore support an important role of posttranslational modifications in the structural polymorphism of amyloid aggregates and their modulatory effect on neurodegeneration.
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Affiliation(s)
- Nasrollah Rezaei-Ghaleh
- From the German Center for Neurodegenerative Diseases (DZNE), Von-Siebold-Strasse 3a, 37075 Göttingen, Germany, Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany,
| | - Sathish Kumar
- Department of Neurology, University of Bonn, 53127 Bonn, Germany, and
| | - Jochen Walter
- Department of Neurology, University of Bonn, 53127 Bonn, Germany, and
| | - Markus Zweckstetter
- From the German Center for Neurodegenerative Diseases (DZNE), Von-Siebold-Strasse 3a, 37075 Göttingen, Germany, Department for NMR-based Structural Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany, Department of Neurology, University Medical Center, University of Göttingen, Göttingen, Waldweg 33, 37073 Göttingen, Germany
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180
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High-resolution analytical imaging and electron holography of magnetite particles in amyloid cores of Alzheimer's disease. Sci Rep 2016; 6:24873. [PMID: 27121137 PMCID: PMC4848473 DOI: 10.1038/srep24873] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Accepted: 03/31/2016] [Indexed: 12/20/2022] Open
Abstract
Abnormal accumulation of brain metals is a key feature of Alzheimer’s disease (AD). Formation of amyloid-β plaque cores (APC) is related to interactions with biometals, especially Fe, Cu and Zn, but their particular structural associations and roles remain unclear. Using an integrative set of advanced transmission electron microscopy (TEM) techniques, including spherical aberration-corrected scanning transmission electron microscopy (Cs-STEM), nano-beam electron diffraction, electron holography and analytical spectroscopy techniques (EDX and EELS), we demonstrate that Fe in APC is present as iron oxide (Fe3O4) magnetite nanoparticles. Here we show that Fe was accumulated primarily as nanostructured particles within APC, whereas Cu and Zn were distributed through the amyloid fibers. Remarkably, these highly organized crystalline magnetite nanostructures directly bound into fibrillar Aβ showed characteristic superparamagnetic responses with saturated magnetization with circular contours, as observed for the first time by off-axis electron holography of nanometer scale particles.
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181
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Istrate AN, Kozin SA, Zhokhov SS, Mantsyzov AB, Kechko OI, Pastore A, Makarov AA, Polshakov VI. Interplay of histidine residues of the Alzheimer's disease Aβ peptide governs its Zn-induced oligomerization. Sci Rep 2016; 6:21734. [PMID: 26898943 PMCID: PMC4761979 DOI: 10.1038/srep21734] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Accepted: 01/29/2016] [Indexed: 12/18/2022] Open
Abstract
Conformational changes of Aβ peptide result in its transformation from native monomeric state to the toxic soluble dimers, oligomers and insoluble aggregates that are hallmarks of Alzheimer's disease (AD). Interactions of zinc ions with Aβ are mediated by the N-terminal Aβ(1-16) domain and appear to play a key role in AD progression. There is a range of results indicating that these interactions trigger the Aβ plaque formation. We have determined structure and functional characteristics of the metal binding domains derived from several Aβ variants and found that their zinc-induced oligomerization is governed by conformational changes in the minimal zinc binding site 6HDSGYEVHH14. The residue H6 and segment 11EVHH14, which are part of this site are crucial for formation of the two zinc-mediated interaction interfaces in Aβ. These structural determinants can be considered as promising targets for rational design of the AD-modifying drugs aimed at blocking pathological Aβ aggregation.
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Affiliation(s)
- Andrey N Istrate
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991, Moscow, Russia
| | - Sergey A Kozin
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991, Moscow, Russia
| | - Sergey S Zhokhov
- Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia
| | - Alexey B Mantsyzov
- Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia
| | - Olga I Kechko
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991, Moscow, Russia
| | | | - Alexander A Makarov
- Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, 119991, Moscow, Russia
| | - Vladimir I Polshakov
- Faculty of Fundamental Medicine, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia
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182
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Ghosh C, Mukherjee S, Seal M, Dey SG. Peroxidase to Cytochrome b Type Transition in the Active Site of Heme-Bound Amyloid β Peptides Relevant to Alzheimer’s Disease. Inorg Chem 2016; 55:1748-57. [DOI: 10.1021/acs.inorgchem.5b02683] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Chandradeep Ghosh
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Soumya Mukherjee
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Manas Seal
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - Somdatta Ghosh Dey
- Department of Inorganic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
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183
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Porter MR, Zaleski JM. The role of ligand covalency in the selective activation of metalloenediynes for Bergman cyclization. Polyhedron 2016; 103:187-195. [PMID: 28931964 PMCID: PMC5602562 DOI: 10.1016/j.poly.2015.10.041] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
One of the key concerns with the development of radical-generating reactive therapeutics is the ability to control the activation event within a biological environment. To that end, a series of quinoline-metal-loenediynes of the form M(QuiED)·2Cl (M = Cu(II), Fe(II), Mg(II), or Zn(II)) and their independently synthesized cyclized analogs have been prepared in an effort to elucidate Bergman cyclization (BC) reactivity differences in solution. HRMS(ESI) establishes a solution stoichiometry of 1:1 metal to ligand with coordination of one chloride counter ion to the metal center. EPR spectroscopy of Cu(QuiED)·2Cl and Cu (QuiBD)·2Cl denotes an axially-elongated tetragonal octahedron (g║ > g⊥ > 2.0023) with a dx2-y2 ground state, while the electronic absorption spectrum reveals a pπ Cl→Cu(II) LMCT feature at 19,000 cm -1, indicating a solution structure with three nitrogens and a chloride in the equatorial plane with the remaining quinoline nitrogen and solvent in the axial positions. Investigations into the BC activity reveal formation of the cyclized product from the Cu(II) and Fe(II) complexes after 12 h at 45 °C in solution, while no product is observed for the Mg(II) or Zn(II) complexes under identical conditions. The basis of this reactivity difference has been found to be a steric effect leading to metal-ligand bond elongation and thus, a retardation of solution reactivity. These results demonstrate how careful consideration of ligand and complex structure may allow for a degree of control and selective activation of these reactive agents.
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Affiliation(s)
- Meghan R. Porter
- Department of Chemistry, Indiana University, Bloomington, IN 47405, United States
| | - Jeffrey M. Zaleski
- Department of Chemistry, Indiana University, Bloomington, IN 47405, United States
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184
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Yang T, Yang L, Zhang C, Wang Y, Ma X, Wang K, Luo J, Yao C, Wang X, Wang X. A copper–amyloid-β targeted fluorescent chelator as a potential theranostic agent for Alzheimer's disease. Inorg Chem Front 2016. [DOI: 10.1039/c6qi00268d] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A fluorescent chelator is able to specifically target and attenuate Cu2+–Aβ aggregates in the brain of mice with Alzheimer's disease, which can be visualized by fluorescence imaging of the chelator.
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Affiliation(s)
- Tao Yang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Liu Yang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Changli Zhang
- Department of Chemistry
- Nanjing Xiaozhuang College
- Nanjing
- P. R. China
| | - Yanqing Wang
- Institute of Applied Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224002
- P. R. China
| | - Xiang Ma
- State Key Laboratory of Coordination Chemistry
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Kun Wang
- State Key Laboratory of Coordination Chemistry
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Jian Luo
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Cheng Yao
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Xiaoyong Wang
- State Key Laboratory of Pharmaceutical Biotechnology
- School of Life Sciences; State Key Laboratory of Analytical Chemistry for Life Science
- Nanjing University
- Nanjing
- P. R. China
| | - Xiaohui Wang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
- State Key Laboratory of Coordination Chemistry
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185
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Balamurugan R, Chang WI, Zhang Y, Fitriyani S, Liu JH. A turn-on fluorescence chemosensor based on a tripodal amine [tris(pyrrolyl-α-methyl)amine]-rhodamine conjugate for the selective detection of zinc ions. Analyst 2016; 141:5456-62. [DOI: 10.1039/c6an00486e] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A tris(pyrrolyl-α-methyl)amine (H3tpa) and rhodamine-based conjugate (PR) served as a sensor for the selective detection of Zn2+and their application of imaging living cells were studied.
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Affiliation(s)
- Rathinam Balamurugan
- Department of Chemical Engineering
- National Cheng Kung University
- Tainan 70101
- Republic of China
| | - Wen-I Chang
- Department of Chemical Engineering
- National Cheng Kung University
- Tainan 70101
- Republic of China
| | - Yandison Zhang
- Department of Chemical Engineering
- National Cheng Kung University
- Tainan 70101
- Republic of China
| | - Sri Fitriyani
- Department of Chemical Engineering
- National Cheng Kung University
- Tainan 70101
- Republic of China
| | - Jui-Hsiang Liu
- Department of Chemical Engineering
- National Cheng Kung University
- Tainan 70101
- Republic of China
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186
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Yang T, Wang X, Zhang C, Ma X, Wang K, Wang Y, Luo J, Yang L, Yao C, Wang X. Specific self-monitoring of metal-associated amyloid-β peptide disaggregation by a fluorescent chelator. Chem Commun (Camb) 2016; 52:2245-8. [DOI: 10.1039/c5cc08898d] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
A dual-functional fluorescent chelator can specifically target and disassemble metal-associated Aβ aggregates and simultaneously self-monitor the disaggregation by fluorescence in brain homogenates of mice with Alzheimer's disease.
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Affiliation(s)
- Tao Yang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Xiaohui Wang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
- State Key Laboratory of Coordination Chemistry
| | - Changli Zhang
- Department of Chemistry
- Nanjing Xiaozhuang College
- Nanjing
- P. R. China
| | - Xiang Ma
- State Key Laboratory of Coordination Chemistry
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Kun Wang
- State Key Laboratory of Coordination Chemistry
- Nanjing University
- Nanjing 210093
- P. R. China
| | - Yanqing Wang
- School of Chemistry and Chemical Engineering
- Yancheng Teachers University
- Yancheng 224002
- P. R. China
| | - Jian Luo
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Liu Yang
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Cheng Yao
- College of Chemistry and Molecular Engineering
- Nanjing Tech University
- Nanjing 211816
- P. R. China
| | - Xiaoyong Wang
- State Key Laboratory of Pharmaceutical Biotechnology
- School of Life Sciences
- State Key Laboratory of Analytical Chemistry for Life Science
- Nanjing University
- Nanjing
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187
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Di Natale G, Sinopoli A, Grenács Á, Sanna D, Sóvágó I, Pappalardo G. Copper(ii) coordination properties of the Aβ(1–16)2 peptidomimetic: experimental evidence of intermolecular macrochelate complex species in the Aβ dimer. NEW J CHEM 2016. [DOI: 10.1039/c6nj02354a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The coordination features of the copper(ii) complexes with a Aβ(1–16)2 dimeric model are reported for the first time.
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Affiliation(s)
| | - Alessandro Sinopoli
- PhD Program in Translational Biomedicine
- University of Catania
- 95125 Catania
- Italy
| | - Ágnes Grenács
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Hungary
| | - Daniele Sanna
- CNR Institute of Biomolecular Chemistry
- 07040 Sassari
- Italy
| | - Imre Sóvágó
- Department of Inorganic and Analytical Chemistry
- University of Debrecen
- Hungary
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188
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Torres JB, Andreozzi EM, Dunn JT, Siddique M, Szanda I, Howlett DR, Sunassee K, Blowera PJ. PET Imaging of Copper Trafficking in a Mouse Model of Alzheimer Disease. J Nucl Med 2016; 57:109-14. [PMID: 26449834 PMCID: PMC6207347 DOI: 10.2967/jnumed.115.162370] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2015] [Accepted: 09/28/2015] [Indexed: 01/23/2023] Open
Abstract
UNLABELLED Alzheimer disease (AD) is a fatal neurodegenerative disorder characterized by progressive neuronal loss and cognitive decline. The lack of reliable and objective diagnostic markers for AD hampers early disease detection and treatment. Growing evidence supports the existence of a dysregulation in brain copper trafficking in AD. The aim of this study was to investigate brain copper trafficking in a transgenic mouse model of AD by PET imaging with (64)Cu, to determine its potential as a diagnostic biomarker of the disorder. METHODS Brain copper trafficking was evaluated in 6- to 8-mo-old TASTPM transgenic mice and age-matched wild-type controls using the (64)Cu bis(thiosemicarbazone) complex (64)Cu-GTSM (glyoxalbis(N(4)-methyl-3-thiosemicarbazonato) copper(II)), which crosses the blood-brain barrier and releases (64)Cu bioreductively into cells. Animals were intravenously injected with (64)Cu-GTSM and imaged at 0-30 min and 24-25 h after injection. The images were analyzed by atlas-based quantification and texture analysis. Regional distribution of (64)Cu in the brain 24 h after injection was also evaluated via ex vivo autoradiography and compared with amyloid-β plaque deposition in TASTPM mice. RESULTS Compared with controls, in TASTPM mice PET image analysis demonstrated significantly increased (by a factor of ~1.3) brain concentration of (64)Cu at 30 min (P < 0.01) and 24 h (P < 0.05) after injection of the tracer and faster (by a factor of ~5) (64)Cu clearance from the brain (P < 0.01). Atlas-based quantification and texture analysis revealed significant differences in regional brain uptake of (64)Cu and PET image heterogeneity between the 2 groups of mice. Ex vivo autoradiography showed that regional brain distribution of (64)Cu at 24 h after injection did not correlate with amyloid-β plaque distribution in TASTPM mice. CONCLUSION The trafficking of (64)Cu in the brain after administration of (64)Cu-GTSM is significantly altered by AD-like pathology in the TASTPM mouse model, suggesting that (64)Cu-GTSM PET imaging warrants clinical evaluation as a diagnostic tool for AD and possibly other neurodegenerative disorders.
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Affiliation(s)
- Julia Baguña Torres
- King’s College London, Division of Imaging Sciences and Biomedical Engineering, St. Thomas’ Hospital, London, SE1 7EH, UK
| | - Erica M. Andreozzi
- King’s College London, Division of Imaging Sciences and Biomedical Engineering, St. Thomas’ Hospital, London, SE1 7EH, UK
| | - Joel T. Dunn
- King’s College London, Division of Imaging Sciences and Biomedical Engineering, St. Thomas’ Hospital, London, SE1 7EH, UK
| | - Muhammad Siddique
- King’s College London, Division of Imaging Sciences and Biomedical Engineering, St. Thomas’ Hospital, London, SE1 7EH, UK
| | - Istvan Szanda
- King’s College London, Division of Imaging Sciences and Biomedical Engineering, St. Thomas’ Hospital, London, SE1 7EH, UK
| | - David R. Howlett
- King’s College London, Wolfson Centre for Age-Related Diseases, Hodgkin Building, Guy’s Campus, London, SE1 1UL, UK
| | - Kavitha Sunassee
- King’s College London, Division of Imaging Sciences and Biomedical Engineering, St. Thomas’ Hospital, London, SE1 7EH, UK
| | - Philip J. Blowera
- King’s College London, Division of Imaging Sciences and Biomedical Engineering, St. Thomas’ Hospital, London, SE1 7EH, UK
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189
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Molecular Magnetic Resonance Imaging Probes Based on Ln3+ Complexes. ADVANCES IN INORGANIC CHEMISTRY 2016. [DOI: 10.1016/bs.adioch.2015.09.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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190
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Jiang L, Zhang M, Tang L, Weng Q, Shen Y, Hu Y, Sheng R. Identification of 2-subsituted benzothiazole derivatives as triple-functional agents with potential for AD therapy. RSC Adv 2016. [DOI: 10.1039/c5ra25788c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
A series of 2-subsituted benzothiazole derivatives were designed and synthesized as MDTLs for potential AD therapy.
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Affiliation(s)
- Liu Jiang
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou 310058
- China
| | - Minkui Zhang
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou 310058
- China
| | - Li Tang
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou 310058
- China
| | - Qinjie Weng
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou 310058
- China
| | - Yanhong Shen
- College of Chemistry and Environmental Science
- Anyang Institute of Technology
- Anyang 455000
- China
| | - Yongzhou Hu
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou 310058
- China
| | - Rong Sheng
- College of Pharmaceutical Sciences
- Zhejiang University
- Hangzhou 310058
- China
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191
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Hevroni BL, Major DT, Dixit M, Mhashal AR, Das S, Fischer B. Nucleoside-2′,3′/3′,5′-bis(thio)phosphate antioxidants are also capable of disassembly of amyloid beta42-Zn(ii)/Cu(ii) aggregates via Zn(ii)/Cu(ii)-chelation. Org Biomol Chem 2016; 14:4640-53. [DOI: 10.1039/c6ob00613b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Nucleoside-2′,3′/3′,5′-bis(thio)phosphate antioxidants were identified as efficient agents of disassembly of Aβ42-Zn(ii)/Cu(ii) aggregates by M(ii)-chelation, thus making promising scaffolds for new Alzheimer's disease therapeutics.
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Affiliation(s)
| | - Dan Thomas Major
- Lise Meitner-Minerva Center of Computational Quantum Chemistry
- Bar-Ilan University
- Ramat-Gan 52900
- Israel
| | - Mudit Dixit
- Lise Meitner-Minerva Center of Computational Quantum Chemistry
- Bar-Ilan University
- Ramat-Gan 52900
- Israel
| | - Anil Ranu Mhashal
- Lise Meitner-Minerva Center of Computational Quantum Chemistry
- Bar-Ilan University
- Ramat-Gan 52900
- Israel
| | - Susanta Das
- Lise Meitner-Minerva Center of Computational Quantum Chemistry
- Bar-Ilan University
- Ramat-Gan 52900
- Israel
| | - Bilha Fischer
- Department of Chemistry
- Bar-Ilan University
- Ramat-Gan 52900
- Israel
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192
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Singh SK, Srivastav S, Yadav AK, Srikrishna S, Perry G. Overview of Alzheimer's Disease and Some Therapeutic Approaches Targeting Aβ by Using Several Synthetic and Herbal Compounds. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2016:7361613. [PMID: 27034741 PMCID: PMC4807045 DOI: 10.1155/2016/7361613] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2015] [Accepted: 11/05/2015] [Indexed: 01/10/2023]
Abstract
Alzheimer's disease (AD) is a complex age-related neurodegenerative disease. In this review, we carefully detail amyloid-β metabolism and its role in AD. We also consider the various genetic animal models used to evaluate therapeutics. Finally, we consider the role of synthetic and plant-based compounds in therapeutics.
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Affiliation(s)
- Sandeep Kumar Singh
- Department of Biochemistry, Faculty of Science, Banaras Hindu University, Varanasi 221 005, India
| | - Saurabh Srivastav
- Department of Biochemistry, Faculty of Science, Banaras Hindu University, Varanasi 221 005, India
| | - Amarish Kumar Yadav
- Department of Biochemistry, Faculty of Science, Banaras Hindu University, Varanasi 221 005, India
| | - Saripella Srikrishna
- Department of Biochemistry, Faculty of Science, Banaras Hindu University, Varanasi 221 005, India
| | - George Perry
- Department of Biology, The University of Texas at San Antonio, San Antonio, TX 78249, USA
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193
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On the generation of OH(·) radical species from H2O2 by Cu(I) amyloid beta peptide model complexes: a DFT investigation. J Biol Inorg Chem 2015; 21:197-212. [PMID: 26711660 DOI: 10.1007/s00775-015-1322-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 12/08/2015] [Indexed: 12/27/2022]
Abstract
According to different studies, the interaction between amyloid β-peptide (Aβ) and copper ions could yield radical oxygen species production, in particular the highly toxic hydroxyl radical OH(·) that is suspected to contribute to Alzheimer's disease pathogenesis. Despite intensive experimental and computational studies, the nature of the interaction between copper and Aβ peptide, as well as the redox reactivity of the system, are still matter of debate. It was proposed that in Cu(II) → Cu(I) reduction the complex Cu(II)-Aβ could follow a multi-step conformational change with redox active intermediates that may be responsible for OH(·) radical production from H2O2 through a Fenton-like process. The purpose of this work is to evaluate, using ab initio Density Functional Theory computations, the reactivity of different Cu(I)-Aβ coordination modes proposed in the literature, in terms of OH(·) production. For each coordination model, we considered the corresponding H2O2 adduct and performed a potential energy surface scan along the reaction coordinate of O-O bond dissociation of the peroxide, resulting in the production of OH(·) radical, obtaining reaction profiles for the evaluation of the energetic of the process. This procedure allowed us to confirm the hypothesis according to which the most populated Cu(I)-Aβ two-histidine coordination is not able to perform efficiently H2O2 reduction, while a less populated three-coordinated form would be responsible for the OH(·) production. We show that coordination modes featuring a third nitrogen containing electron-donor ligand (an imidazole ring of an histidine residue is slightly favored over the N-terminal amine group) are more active towards H2O2 reduction.
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194
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Muthuraj B, Layek S, Balaji SN, Trivedi V, Iyer PK. Multiple function fluorescein probe performs metal chelation, disaggregation, and modulation of aggregated Aβ and Aβ-Cu complex. ACS Chem Neurosci 2015; 6:1880-91. [PMID: 26332658 DOI: 10.1021/acschemneuro.5b00205] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
An exceptional probe comprising indole-3-carboxaldehyde fluorescein hydrazone (FI) performs multiple tasks, namely, disaggregating amyloid β (Aβ) aggregates in different biomarker environments such as cerebrospinal fluid (CSF), Aβ1-40 fibrils, β-amyloid lysozyme aggregates (LA), and U87 MG human astrocyte cells. Additionally, the probe FI binds with Cu(2+) ions selectively, disrupts the Aβ aggregates that vary from few nanometers to micrometers, and prevents their reaggregation, thereby performing disaggregation and modulation of amyloid-β in the presence as well as absence of Cu(2+) ion. The excellent selectivity of probe FI for Cu(2+) was effectively utilized to modulate the assembly of metal-induced Aβ aggregates by metal chelation with the "turn-on" fluorescence via spirolactam ring opening of FI as well as the metal-free Aβ fibrils by noncovalent interactions. These results confirm that FI has exceptional ability to perform multifaceted tasks such as metal chelation in intracellular conditions using Aβ lysozyme aggregates in cellular environments by the disruption of β-sheet rich Aβ fibrils into disaggregated forms. Subsequently, it was confirmed that FI had the ability to cross the blood-brain barrier and it also modulated the metal induced Aβ fibrils in cellular environments by "turn-on" fluorescence, which are the most vital properties of a probe or a therapeutic agent. Furthermore, the morphology changes were examined by atomic force microscopy (AFM), polarizable optical microscopy (POM), fluorescence microscopy, and dynamic light scattering (DLS) studies. These results provide very valuable clues on the Aβ (CSF Aβ fibrils, Aβ1-40 fibrils, β-amyloid lysozyme aggregates) disaggregation behavior via in vitro studies, which constitute the first insights into intracellular disaggregation of Aβ by "turn-on" method thereby influencing amyloidogenesis.
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Affiliation(s)
- B. Muthuraj
- Department of Chemistry, and ‡Department of Biosciences
and Bioengineering, Indian Institute of Technology Guwahati-781039, Assam, India
| | - Sourav Layek
- Department of Chemistry, and ‡Department of Biosciences
and Bioengineering, Indian Institute of Technology Guwahati-781039, Assam, India
| | - S. N. Balaji
- Department of Chemistry, and ‡Department of Biosciences
and Bioengineering, Indian Institute of Technology Guwahati-781039, Assam, India
| | - Vishal Trivedi
- Department of Chemistry, and ‡Department of Biosciences
and Bioengineering, Indian Institute of Technology Guwahati-781039, Assam, India
| | - Parameswar Krishnan Iyer
- Department of Chemistry, and ‡Department of Biosciences
and Bioengineering, Indian Institute of Technology Guwahati-781039, Assam, India
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195
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Hane FT, Drolle E, Leonenko Z. Amyloid-β (1-40) restores adhesion properties of pulmonary surfactant, counteracting the effect of cholesterol. Phys Chem Chem Phys 2015; 16:15430-6. [PMID: 24947303 DOI: 10.1039/c4cp00040d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A pulmonary surfactant (PS) is a thin lipid-protein film covering the surface of the lung alveoli at the air/liquid interface. The primary purpose of a PS is to control the surface tension of the air/liquid interface and to reduce the work of breathing. High levels of cholesterol in a PS are associated with life-threatening acute respiratory distress syndrome (ARDS) and acute lung injury (ALI). Finding therapeutics to counteract the effect of cholesterol in a PS is a matter of contemporary research. In our earlier work, we showed that the addition of amyloid-β (1-40) (Aβ40), the protein implicated in Alzheimer's disease, can reverse the detrimental effects of cholesterol in surfactants by improving multilayer formation and restoring PS surface active properties. We hypothesized that this phenomenon was due to Aβ40 improving adhesion properties of a surfactant. In this work we used atomic force spectroscopy to demonstrate that Aβ40 counteracts the adhesive properties of a PS compromised by high levels of cholesterol in a PS and helps to restore the functionality of a PS.
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Affiliation(s)
- F T Hane
- Department of Biology, University of Waterloo, 200 University Ave, Waterloo, ON N2L 3G1, Canada
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196
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Borutaite V, Morkuniene R, Valincius G. Beta-amyloid oligomers: recent developments. Biomol Concepts 2015; 2:211-22. [PMID: 25962030 DOI: 10.1515/bmc.2011.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2011] [Accepted: 05/09/2011] [Indexed: 01/01/2023] Open
Abstract
Recent studies point to a critical role of soluble β-amyloid oligomers in the pathogenesis of one of the most common neurodegenerative diseases, Alzheimer's disease (AD). Beta-amyloid peptides are cleavage products of a ubiquitously expressed protein, the amyloid precursor protein. Early studies suggested that accumulation of extracellular β-amyloid aggregates are the most toxic species causing synaptic dysfunction and neuronal loss in particular regions of the brain (neurobiological features underlying cognitive decline of the AD patients). In recent years, a shift of pardigm occurred, and now there is accumulating evidence that soluble oligomeric forms of the peptide are the most toxic to neuronal cells. In this review, we discuss recent findings on the toxic effects of amyloid-β oligomers, their physico-chemical properties and the possible pathways of their formation in vitro and in vivo.
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197
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Pietropaolo A, Satriano C, Strano G, La Mendola D, Rizzarelli E. Different zinc(II) complex species and binding modes at Aβ N-terminus drive distinct long range cross-talks in the Aβ monomers. J Inorg Biochem 2015; 153:367-376. [PMID: 26298865 DOI: 10.1016/j.jinorgbio.2015.08.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Revised: 07/24/2015] [Accepted: 08/05/2015] [Indexed: 10/23/2022]
Abstract
The present study addresses the reconstruction of the free-energy landscapes of amyloid-beta1-42 (Aβ42) coordinated respectively with one and two zinc ions, to scrutinize whether different Aβ-zinc complex species, i.e., mononuclear and dinuclear metal complexes, induce different Aβ conformation features. We found a subtle switch of intramolecular interactions, depending both on the zinc coordination environment and on the peptide to zinc stoichiometric ratio. On the one side, hairpin-like structures are predominant in mononuclear complexes, where a salt-bridge that involves Lys28-Glu22 and Lys16-Asp23 is stabilized. On the other side, elongated conformations are instead stabilized in the dinuclear zinc complexes. Experimental studies of atomic force microscopy as well as of zinc-Aβ complex species distribution diagrams provide evidence that the theoretical calculations can be rationalized in terms of the correlation between the increased amount of amorphous aggregates and the Aβ/Zn(2+) ratio.
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Affiliation(s)
- Adriana Pietropaolo
- Dipartimento di Scienze della Salute, Università di Catanzaro, Viale Europa, 88100 Catanzaro, Italy
| | - Cristina Satriano
- Dipartimento di Scienze Chimiche, Università degli Studi di Catania, viale Andrea Doria, 6, 95125 Catania, Italy
| | - Gaetano Strano
- Fondazione RI.MED, Via Bandiera 11, 90133 Palermo, Italy
| | - Diego La Mendola
- Dipartimento di Farmacia, Università di Pisa, via Bonanno Pisano, 6, 56126 Pisa, Italy
| | - Enrico Rizzarelli
- Istituto di Biostrutture e Bioimagini-Consiglio Nazionale delle Ricerche (IBB-CNR), Via Paolo Gaifami, 18, 95126 Catania, Italy.
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198
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Fragoso A, Carvalho T, Rousselot-Pailley P, Correia dos Santos MM, Delgado R, Iranzo O. Effect of the Peptidic Scaffold in Copper(II) Coordination and the Redox Properties of Short Histidine-Containing Peptides. Chemistry 2015; 21:13100-11. [DOI: 10.1002/chem.201501715] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2015] [Indexed: 01/07/2023]
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199
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Liao Q, Kamerlin SCL, Strodel B. Development and Application of a Nonbonded Cu(2+) Model That Includes the Jahn-Teller Effect. J Phys Chem Lett 2015; 6:2657-62. [PMID: 26167255 PMCID: PMC4493862 DOI: 10.1021/acs.jpclett.5b01122] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Accepted: 06/18/2015] [Indexed: 05/26/2023]
Abstract
Metal ions are both ubiquitous to and crucial in biology. In classical simulations, they are typically described as simple van der Waals spheres, making it difficult to provide reliable force field descriptions for them. An alternative is given by nonbonded dummy models, in which the central metal atom is surrounded by dummy particles that each carry a partial charge. While such dummy models already exist for other metal ions, none is available yet for Cu(2+) because of the challenge to reproduce the Jahn-Teller distortion. This challenge is addressed in the current study, where, for the first time, a dummy model including a Jahn-Teller effect is developed for Cu(2+). We successfully validate its usefulness by studying metal binding in two biological systems: the amyloid-β peptide and the mixed-metal enzyme superoxide dismutase. We believe that our parameters will be of significant value for the computational study of Cu(2+)-dependent biological systems using classical models.
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Affiliation(s)
- Qinghua Liao
- Institute of Complex
Systems: Structural Biochemistry, Forschungszentrum Jülich, 52425 Jülich, Germany
| | | | - Birgit Strodel
- Institute of Complex
Systems: Structural Biochemistry, Forschungszentrum Jülich, 52425 Jülich, Germany
- Institute
of Theoretical and Computational Chemistry, Heinrich Heine University Düsseldorf, Universitätsstrasse 1, 40225 Düsseldorf, Germany
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200
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Xu L, Shan S, Chen Y, Wang X, Nussinov R, Ma B. Coupling of Zinc-Binding and Secondary Structure in Nonfibrillar Aβ40 Peptide Oligomerization. J Chem Inf Model 2015; 55:1218-30. [PMID: 26017140 PMCID: PMC6407634 DOI: 10.1021/acs.jcim.5b00063] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Nonfibrillar neurotoxic amyloid β (Aβ) oligomer structures are typically rich in β-sheets, which could be promoted by metal ions like Zn(2+). Here, using molecular dynamics (MD) simulations, we systematically examined combinations of Aβ40 peptide conformations and Zn(2+) binding modes to probe the effects of secondary structure on Aβ dimerization energies and kinetics. We found that random conformations do not contribute to dimerization either thermodynamically or kinetically. Zn(2+) couples with preformed secondary structures (α-helix and β-hairpin) to speed dimerization and stabilize the resulting dimer. Partial α-helices increase the dimerization speed, and dimers with α-helix rich conformations have the lowest energy. When Zn(2+) coordinates with residues D1, H6, H13, and H14, Aβ40 β-hairpin monomers have the fastest dimerization speed. Dimers with experimentally observed zinc coordination (E11, H6, H13, and H14) form with slower rate but have lower energy. Zn(2+) cannot stabilize fibril-like β-arch dimers. However, Zn(2+)-bound β-arch tetramers have the lowest energy. Collectively, zinc-stabilized β-hairpin oligomers could be important in the nucleation-polymerization of cross-β structures. Our results are consistent with experimental findings that α-helix to β-structural transition should accompany Aβ aggregation in the presence of zinc ions and that Zn(2+) stabilizes nonfibrillar Aβ oligomers and, thus, inhibits formation of less toxic Aβ fibrils.
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Affiliation(s)
- Liang Xu
- School of Chemistry, Dalian University of Technology, Dalian, China
| | - Shengsheng Shan
- School of Chemistry, Dalian University of Technology, Dalian, China
| | - Yonggang Chen
- Network and Information Center, Dalian University of Technology, Dalian, China
| | - Xiaojuan Wang
- School of Chemical Machinery, Dalian University of Technology, Dalian, China
| | - Ruth Nussinov
- Sackler Inst. of Molecular Medicine Department of Human Genetics and Molecular Medicine Sackler School of Medicine, Tel Aviv University, Tel Aviv 69978, Israel
- Basic Science Program, Leidos Biomedical Research, Inc. Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland 21702
| | - Buyong Ma
- Basic Science Program, Leidos Biomedical Research, Inc. Cancer and Inflammation Program, National Cancer Institute, Frederick, Maryland 21702
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