101
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Affiliation(s)
- Jason Rihel
- Department of Cell and Developmental Biology, University College, London, London, UK.
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102
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Grüter A, Hoffmann M, Müller R, Wohland T, Jung G. A high-affinity fluorescence probe for copper(II) ions and its application in fluorescence lifetime correlation spectroscopy. Anal Bioanal Chem 2019; 411:3229-3240. [PMID: 31025181 DOI: 10.1007/s00216-019-01798-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/21/2019] [Accepted: 03/21/2019] [Indexed: 10/26/2022]
Abstract
Copper is one of the most important transition metals in many organisms where it catalyzes a manifold of different processes. As a result of copper's redox activity, organisms have to avoid unbound ions, and a dysfunctional copper homeostasis may lead to multifarious pathological processes in cells with very severe ramifications for the affected organisms. In many neurodegenerative diseases, however, the exact role of copper ions is still not completely clarified. In this work, a high-affinity and highly selective copper probe molecule, based on the naturally occurring tetrapeptide DAHK is synthesized. The sensor (log KD = - 12.8 ± 0.1) is tagged with a fluorescent BODIPY dye whose fluorescence lifetime distinctly decreases from 5.8 ns ± 0.2 ns to 0.4 ns ± 0.1 ns on binding to copper(II) cations. It is shown by using fluorescence lifetime correlation spectroscopy that the concentration of both probe and probe-copper complex can be simultaneously measured even at nanomolar concentration levels. This work presents a possible starting point for a new type of probe and method for future in vivo studies to further reveal the exact role of copper ions in organisms. Graphical abstract.
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Affiliation(s)
- Andreas Grüter
- Department of Biophysical Chemistry, Saarland University, Campus B2 2, 66123, Saarbrücken, Germany
| | - Michael Hoffmann
- Department of Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Center for Infection Research, Saarland University, Campus E8 1, 66123, Saarbrücken, Germany
| | - Rolf Müller
- Department of Microbial Natural Products, Helmholtz Institute for Pharmaceutical Research Saarland, Helmholtz Center for Infection Research, Saarland University, Campus E8 1, 66123, Saarbrücken, Germany
| | - Thorsten Wohland
- Department of Chemistry, National University of Singapore, Singapore, 117543, Singapore.,Department of Biological Sciences, Center for Bio-Imaging Sciences, National University of Singapore, Singapore, 117557, Singapore
| | - Gregor Jung
- Department of Biophysical Chemistry, Saarland University, Campus B2 2, 66123, Saarbrücken, Germany.
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103
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Abeyawardhane DL, Heitger DR, Fernández RD, Forney AK, Lucas HR. C-Terminal Cu II Coordination to α-Synuclein Enhances Aggregation. ACS Chem Neurosci 2019; 10:1402-1410. [PMID: 30384594 DOI: 10.1021/acschemneuro.8b00448] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
The structurally dynamic amyloidogenic protein α-synuclein (αS) is universally recognized as a key player in Parkinson's disease (PD). Copper, which acts as a neuronal signaling agent, is also an effector of αS structure, aggregation, and localization in vivo. In humans, αS is known to carry an acetyl group on the starting methionine residue, capping the N-terminal free amine which was a known high-affinity CuII binding site. We now report the first detailed characterization data using electron paramagnetic resonance (EPR) spectroscopy to describe the CuII coordination modes of N-terminally acetylated αS (NAcαS). Through use of EPR hyperfine structure analyses and the Peisach-Blumberg correlation, an N3O1 binding mode was established that involves the single histidine residue at position 50 and a lower population of a second CuII-binding mode that may involve a C-terminal contribution. We additionally generated an N-terminally acetylated disease-relevant variant, NAcH50Q, that promotes a shift in the CuII binding site to the C-terminus of the protein. Moreover, fibrillar NAcH50Q-CuII exhibits enhanced parallel β-sheet character and increased hydrophobic surface area compared to NAcαS-CuII and to both protein variants that lack a coordinated cupric ion. The results presented herein demonstrate the differential impact of distinct CuII binding sites within NAcαS, revealing that C-terminal CuII binding exacerbates the structural consequences of the H50Q missense mutation. Likewise, the global structural modifications that result from N-terminal capping augment the properties of CuII coordination. Hence, consideration of the effect of CuII on NAcαS and NAcH50Q misfolding may shed light on the extrinsic or environmental factors that influence PD pathology.
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Affiliation(s)
| | - Denver R. Heitger
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Ricardo D. Fernández
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Ashley K. Forney
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Heather R. Lucas
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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104
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Karginova O, Weekley CM, Raoul A, Alsayed A, Wu T, Lee SSY, He C, Olopade OI. Inhibition of Copper Transport Induces Apoptosis in Triple-Negative Breast Cancer Cells and Suppresses Tumor Angiogenesis. Mol Cancer Ther 2019; 18:873-885. [PMID: 30824611 DOI: 10.1158/1535-7163.mct-18-0667] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Revised: 12/18/2018] [Accepted: 02/22/2019] [Indexed: 11/16/2022]
Abstract
Treatment of advanced breast cancer remains challenging. Copper and some of the copper-dependent proteins are emerging therapeutic targets because they are essential for cell proliferation and survival, and have been shown to stimulate angiogenesis and metastasis. Here, we show that DCAC50, a recently developed small-molecule inhibitor of the intracellular copper chaperones, ATOX1 and CCS, reduces cell proliferation and elevates oxidative stress, triggering apoptosis in a panel of triple-negative breast cancer (TNBC) cells. Inhibition of ATOX1 activity with DCAC50 disrupts copper homeostasis, leading to increased copper levels, altered spatial copper redistribution, and accumulation of ATP7B to the cellular perinuclear region. The extent and impact of this disruption to copper homeostasis vary across cell lines and correlate with cellular baseline copper and glutathione levels. Ultimately, treatment with DCAC50 attenuates tumor growth and suppresses angiogenesis in a xenograft mouse model, and prevents endothelial cell network formation in vitro Co-treatment with paclitaxel and DCAC50 enhances cytotoxicity in TNBC and results in favorable dose reduction of both drugs. These data demonstrate that inhibition of intracellular copper transport targets tumor cells and the tumor microenvironment, and is a promising approach to treat breast cancer.
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Affiliation(s)
- Olga Karginova
- Department of Medicine, Section of Hematology/Oncology, The University of Chicago, Chicago, Illinois
| | - Claire M Weekley
- Department of Chemistry, Institute for Biophysical Dynamics and Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois.,Department of Biochemistry and Molecular Biology, Institute for Biophysical Dynamics and Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois
| | - Akila Raoul
- Department of Medicine, Section of Hematology/Oncology, The University of Chicago, Chicago, Illinois
| | - Alhareth Alsayed
- Department of Medicine, Section of Hematology/Oncology, The University of Chicago, Chicago, Illinois
| | - Tong Wu
- Department of Chemistry, Institute for Biophysical Dynamics and Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois.,Department of Biochemistry and Molecular Biology, Institute for Biophysical Dynamics and Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois
| | - Steve Seung-Young Lee
- Department of Molecular Genetics and Cell Biology, The University of Chicago, Chicago, Illinois
| | - Chuan He
- Department of Chemistry, Institute for Biophysical Dynamics and Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois.,Department of Biochemistry and Molecular Biology, Institute for Biophysical Dynamics and Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois
| | - Olufunmilayo I Olopade
- Department of Medicine, Section of Hematology/Oncology, The University of Chicago, Chicago, Illinois. .,Center for Clinical Cancer Genetics, The University of Chicago, Chicago, Illinois
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105
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Abeyawardhane DL, Fernández RD, Heitger DR, Crozier MK, Wolver JC, Lucas HR. Copper Induced Radical Dimerization of α-Synuclein Requires Histidine. J Am Chem Soc 2018; 140:17086-17094. [DOI: 10.1021/jacs.8b08947] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | - Ricardo D. Fernández
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Denver R. Heitger
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Madeleine K. Crozier
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Julia C. Wolver
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Heather R. Lucas
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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106
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Rakshit A, Khatua K, Shanbhag V, Comba P, Datta A. Cu 2+ selective chelators relieve copper-induced oxidative stress in vivo. Chem Sci 2018; 9:7916-7930. [PMID: 30450181 PMCID: PMC6202919 DOI: 10.1039/c8sc04041a] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 09/29/2018] [Indexed: 02/06/2023] Open
Abstract
Copper ions are essential for biological function yet are severely detrimental when present in excess. At the molecular level, copper ions catalyze the production of hydroxyl radicals that can irreversibly alter essential bio-molecules. Hence, selective copper chelators that can remove excess copper ions and alleviate oxidative stress will help assuage copper-overload diseases. However, most currently available chelators are non-specific leading to multiple undesirable side-effects. The challenge is to build chelators that can bind to copper ions with high affinity but leave the levels of essential metal ions unaltered. Here we report the design and development of redox-state selective Cu ion chelators that have 108 times higher conditional stability constants toward Cu2+ compared to both Cu+ and other biologically relevant metal ions. This unique selectivity allows the specific removal of Cu2+ ions that would be available only under pathophysiological metal overload and oxidative stress conditions and provides access to effective removal of the aberrant redox-cycling Cu ion pool without affecting the essential non-redox cycling Cu+ labile pool. We have shown that the chelators provide distinct protection against copper-induced oxidative stress in vitro and in live cells via selective Cu2+ ion chelation. Notably, the chelators afford significant reduction in Cu-induced oxidative damage in Atp7a-/- Menkes disease model cells that have endogenously high levels of Cu ions. Finally, in vivo testing of our chelators in a live zebrafish larval model demonstrate their protective properties against copper-induced oxidative stress.
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Affiliation(s)
- Ananya Rakshit
- Department of Chemical Sciences , Tata Institute of Fundamental Research , 1 Homi Bhabha Road, Colaba , Mumbai-400005 , India .
| | - Kaustav Khatua
- Department of Chemical Sciences , Tata Institute of Fundamental Research , 1 Homi Bhabha Road, Colaba , Mumbai-400005 , India .
| | - Vinit Shanbhag
- Department of Biochemistry , Christopher S. Bond Life Science Center , University of Missouri , Columbia , USA
| | - Peter Comba
- Universität Heidelberg , Anorganisch-Chemisches Institut , Interdisciplinary Center for Scientific Computing , INF 270 , D-69120 Heidelberg , Germany
| | - Ankona Datta
- Department of Chemical Sciences , Tata Institute of Fundamental Research , 1 Homi Bhabha Road, Colaba , Mumbai-400005 , India .
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107
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Puchkova LV, Babich PS, Zatulovskaia YA, Ilyechova EY, Di Sole F. Copper Metabolism of Newborns Is Adapted to Milk Ceruloplasmin as a Nutritive Source of Copper: Overview of the Current Data. Nutrients 2018; 10:E1591. [PMID: 30380720 PMCID: PMC6266612 DOI: 10.3390/nu10111591] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 10/17/2018] [Accepted: 10/26/2018] [Indexed: 12/19/2022] Open
Abstract
Copper, which can potentially be a highly toxic agent, is an essential nutrient due to its role as a cofactor for cuproenzymes and its participation in signaling pathways. In mammals, the liver is a central organ that controls copper turnover throughout the body, including copper absorption, distribution, and excretion. In ontogenesis, there are two types of copper metabolism, embryonic and adult, which maintain the balance of copper in each of these periods of life, respectively. In the liver cells, these types of metabolism are characterized by the specific expression patterns and activity levels of the genes encoding ceruloplasmin, which is the main extracellular ferroxidase and copper transporter, and the proteins mediating ceruloplasmin metalation. In newborns, the molecular genetic mechanisms responsible for copper homeostasis and the ontogenetic switch from embryonic to adult copper metabolism are highly adapted to milk ceruloplasmin as a dietary source of copper. In the mammary gland cells, the level of ceruloplasmin gene expression and the alternative splicing of its pre-mRNA govern the amount of ceruloplasmin in the milk, and thus, the amount of copper absorbed by a newborn is controlled. In newborns, the absorption, distribution, and accumulation of copper are adapted to milk ceruloplasmin. If newborns are not breast-fed in the early stages of postnatal development, they do not have this natural control ensuring alimentary copper balance in the body. Although there is still much to be learned about the neonatal consequences of having an imbalance of copper in the mother/newborn system, the time to pay attention to this problem has arrived because the neonatal misbalance of copper may provoke the development of copper-related disorders.
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Affiliation(s)
- Ludmila V Puchkova
- Laboratory of Trace Elements Metabolism, ITMO University, Kronverksky av., 49, 197101 St.-Petersburg, Russia.
- Department of Molecular Genetics, Research Institute of Experimental Medicine, Acad. Pavlov str., 12, 197376 St.-Petersburg, Russia.
- Department of Biophysics, Peter the Great St. Petersburg Polytechnic University, Politekhnicheskaya str., 29, 195251 St.-Petersburg, Russia.
| | - Polina S Babich
- Department of Zoology, Herzen State Pedagogical University of Russia, Kazanskaya str., 6, 191186 St.-Petersburg, Russia.
| | - Yulia A Zatulovskaia
- Department of Neurosurgery, Stanford University School of Medicine, Stanford, CA 94305, USA.
| | - Ekaterina Y Ilyechova
- Laboratory of Trace Elements Metabolism, ITMO University, Kronverksky av., 49, 197101 St.-Petersburg, Russia.
| | - Francesca Di Sole
- Department of Physiology and Pharmacology, Des Moines University, Des Moines, IA 50312, USA.
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108
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Kardos J, Héja L, Simon Á, Jablonkai I, Kovács R, Jemnitz K. Copper signalling: causes and consequences. Cell Commun Signal 2018; 16:71. [PMID: 30348177 PMCID: PMC6198518 DOI: 10.1186/s12964-018-0277-3] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2018] [Accepted: 09/24/2018] [Indexed: 12/18/2022] Open
Abstract
Copper-containing enzymes perform fundamental functions by activating dioxygen (O2) and therefore allowing chemical energy-transfer for aerobic metabolism. The copper-dependence of O2 transport, metabolism and production of signalling molecules are supported by molecular systems that regulate and preserve tightly-bound static and weakly-bound dynamic cellular copper pools. Disruption of the reducing intracellular environment, characterized by glutathione shortage and ambient Cu(II) abundance drives oxidative stress and interferes with the bidirectional, copper-dependent communication between neurons and astrocytes, eventually leading to various brain disease forms. A deeper understanding of of the regulatory effects of copper on neuro-glia coupling via polyamine metabolism may reveal novel copper signalling functions and new directions for therapeutic intervention in brain disorders associated with aberrant copper metabolism.
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Affiliation(s)
- Julianna Kardos
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - László Héja
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - Ágnes Simon
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - István Jablonkai
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
| | - Richard Kovács
- Institute of Neurophysiology, Charité-Universitätsmedizin, Berlin, Germany
| | - Katalin Jemnitz
- Functional Pharmacology Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, Budapest, 1117 Hungary
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109
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Endocytosis of G Protein-Coupled Receptors and Their Ligands: Is There a Role in Metal Trafficking? Cell Biochem Biophys 2018; 76:329-337. [PMID: 30022374 DOI: 10.1007/s12013-018-0850-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2018] [Accepted: 07/03/2018] [Indexed: 12/22/2022]
Abstract
The prevalence of metal dysregulation in many neurodegenerative and neurocognitive disorders has compelled many studying such diseases to investigate the mechanisms underlying metal regulation in the central nervous system. Metal homoeostasis is often complex, with sophisticated, multilayered pathways in operation. G protein-coupled receptors are omnipresent on cell membranes and have intriguing mechanisms of endocytosis and trafficking that may be useful in metal homoeostasis. Indeed, many receptors and/or their cognate ligands are able to bind metals, and in many cases metals are considered to have neuromodulatory roles as a result of receptor binding. In this mini-review, we outline the structural and functional aspects of G protein-coupled receptors with a focus on the mechanisms leading to endocytosis and cellular trafficking. We further highlight how this may help in the trafficking of metal ions, notably copper.
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110
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Guengerich FP. Introduction to Metals in Biology 2018: Copper homeostasis and utilization in redox enzymes. J Biol Chem 2018; 293:4603-4605. [PMID: 29425098 DOI: 10.1074/jbc.tm118.002255] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
This 11th Thematic Metals in Biology Thematic Series deals with copper, a transition metal with a prominent role in biochemistry. Copper is a very versatile element, and both deficiencies and excesses can be problematic. The five Minireviews in this series deal with several aspects of copper homeostasis in microorganisms and mammals and the role of this metal in two enzymes, copper-only superoxide dismutase and cytochrome c oxidase.
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Affiliation(s)
- F Peter Guengerich
- Department of Biochemistry, Vanderbilt University School of Medicine, Nashville, Tennessee 37232-0146.
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111
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Mustafa SK, AlSharif MA. Copper (Cu) an Essential Redox-Active Transition Metal in Living System—A Review Article. ACTA ACUST UNITED AC 2018. [DOI: 10.4236/ajac.2018.91002] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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112
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Balsano C, Porcu C, Sideri S. Is copper a new target to counteract the progression of chronic diseases? Metallomics 2018; 10:1712-1722. [DOI: 10.1039/c8mt00219c] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In this review, we highlight the importance of a Cu imbalance in the pathogenesis of several chronic inflammatory diseases.
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