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de Oliveira Silva YR, Zheng D, Peters SC, Fisher OS. Stabilization of a Cu-binding site by a highly conserved tryptophan residue. J Inorg Biochem 2024; 253:112501. [PMID: 38342077 DOI: 10.1016/j.jinorgbio.2024.112501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2023] [Revised: 01/31/2024] [Accepted: 02/01/2024] [Indexed: 02/13/2024]
Abstract
Copper serves as an essential cofactor for nearly all living organisms. There are still many gaps remaining in our knowledge of how Gram-positive bacteria import copper and maintain homeostasis. To obtain a better understanding of how these processes work, here we focus on the ycnKJI operon responsible for regulating copper levels in the Gram-positive bacterium Bacillus subtilis. This operon encodes three Cu-related proteins: a copper-dependent transcriptional repressor (YcnK), a putative copper importer (YcnJ), and a copper-binding protein of unknown function (YcnI). We previously found that YcnI's extracellular Domain of Unknown Function 1775 (DUF1775) houses a monohistidine brace motif that coordinates a single Cu(II) ion. The Cu(II) binding site includes a highly conserved tryptophan residue. Here, we investigate the role of that tryptophan and the ability of the protein to interact with other oxidation states of Cu. We find that YcnI exhibits strong preference for binding Cu in the oxidized Cu(II) state, and that the conserved tryptophan residue is not essential for the interaction. We determine the structure of a tryptophan variant to 1.95 Å resolution that indicates that the tryptophan is needed to stabilize the metal binding interaction, and find that this variant has weaker affinity for Cu(II) than the wild-type protein. Together, these data provide further insights into the DUF1775 domain family and reveal the role of the conserved tryptophan residue.
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Affiliation(s)
| | - Dia Zheng
- Department of Chemistry, Lehigh University, 6 E Packer Ave, Bethlehem, PA 18015, USA
| | - Stephen C Peters
- Department of Earth and Environmental Sciences, Lehigh University, 1 W Packer Ave, Bethlehem, PA 18015, USA
| | - Oriana S Fisher
- Department of Chemistry, Lehigh University, 6 E Packer Ave, Bethlehem, PA 18015, USA.
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2
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Strausbaugh Hjelmstad A, Pushie MJ, Ruth K, Escobedo M, Kuter K, Haas KL. Investigating Cu(I) binding to model peptides of N-terminal Aβ isoforms. J Inorg Biochem 2024; 253:112480. [PMID: 38309203 DOI: 10.1016/j.jinorgbio.2024.112480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 12/10/2023] [Accepted: 01/02/2024] [Indexed: 02/05/2024]
Abstract
Amyloid beta (Aβ) peptides and copper (Cu) ions are each involved in critical biological processes including antimicrobial activity, regulation of synaptic function, angiogenesis, and others. Aβ binds to Cu and may play a role in Cu trafficking. Aβ peptides exist in isoforms that vary at their C-and N-termini; variation at the N-terminal sequence affects Cu binding affinity, structure, and redox activity by providing different sets of coordinating groups to the metal ion. Several N-terminal isoforms have been detected in human brain tissues including Aβ1-40/42, Aβ3-42, pEAβ3-42, Aβ4-42, Aβ11-40 and pEAβ11-40 (where pE denotes an N-terminal pyroglutamic acid). Several previous works have individually investigated the affinity and structure of Cu(I) bound to some of these isoforms' metal binding domains. However, the disparately reported values are apparent constants collected under different sets of conditions, and thus an integrated comparison cannot be made. The work presented here provides the Cu(I) coordination structure and binding affinities of these six biologically relevant Aβ isoforms determined in parallel using model peptides of the Aβ metal binding domains (Aβ1-16, Aβ3-16, pEAβ3-16, Aβ4-16, Aβ11-16 and pEAβ11-16). The binding affinities of Cu(I)-Aβ complexes were measured using solution competition with ferrozine (Fz) and bicinchoninic acid (BCA), two colorimetric Cu(I) indicators in common use. The Cu(I) coordination structures were characterized by X-ray absorption spectroscopy. The data presented here facilitate comparison of the isoforms' Cu-binding interactions and contribute to our understanding of the role of Aβ peptides as copper chelators in healthy and diseased brains.
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Affiliation(s)
| | - M Jake Pushie
- Department of Surgery, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada
| | - Kaylee Ruth
- Department of Chemistry, Duke University, Durham, NC 27708, USA
| | - Maria Escobedo
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, USA
| | - Kristin Kuter
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, USA
| | - Kathryn L Haas
- Department of Chemistry, Duke University, Durham, NC 27708, USA.
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3
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Schulte NB, Pushie MJ, Martinez A, Sendzik M, Escobedo M, Kuter K, Haas KL. Exploration of the Potential Role of Serum Albumin in the Delivery of Cu(I) to Ctr1. Inorg Chem 2023; 62:4021-4034. [PMID: 36826341 DOI: 10.1021/acs.inorgchem.2c03753] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023]
Abstract
Human serum albumin (HSA) is the major copper (Cu) carrier in blood. The majority of previous studies that have investigated Cu interactions with HSA have focused primarily on the Cu(II) oxidation state. Yet, cellular Cu uptake by the human copper transport protein (Ctr1), a plasma membrane-embedded protein responsible for Cu uptake into cells, requires Cu(I). Recent in vitro work has determined that reducing agents, such as the ascorbate present in blood, are sufficient to reduce the Cu(II)HSA complex to form Cu(I)HSA and that Cu(I) is bound to HSA with pM affinity. The biological accessibility of Cu(I)HSA suggests that HSA-bound Cu(I) may be an unappreciated form of Cu cargo and a key player in extracellular Cu trafficking. To better understand Cu trafficking by HSA, we sought to investigate the exchange of Cu(I) from HSA to a model peptide of the Cu-binding ectodomain of Ctr1. In this study, we used X-ray absorption near-edge spectroscopy to show that Cu(I) becomes more highly coordinated as increasing amounts of the Ctr1-14 model peptide are added to a solution of Cu(I)HSA. Extended X-ray absorption fine structure (EXAFS) spectroscopy was used to further characterize the interaction of Cu(I)HSA with Ctr1-14 by determining the ligands coordinating Cu(I) and their bond lengths. The EXAFS data support that some Cu(I) likely undergoes complete transfer from HSA to Ctr1-14. This finding of HSA interacting with and releasing Cu(I) to an ectodomain model peptide of Ctr1 suggests a mechanism by which HSA delivers Cu(I) to cells under physiological conditions.
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Affiliation(s)
- Natalie B Schulte
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
| | - M Jake Pushie
- Department of Surgery, University of Saskatchewan, Saskatoon, Saskatchewan S7N 5E5, Canada
| | - Ana Martinez
- Department of Chemistry and Physics, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Madison Sendzik
- Department of Chemistry and Physics, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Maria Escobedo
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Kristin Kuter
- Department of Mathematics and Computer Science, Saint Mary's College, Notre Dame, Indiana 46556, United States
| | - Kathryn L Haas
- Department of Chemistry, Duke University, Durham, North Carolina 27708, United States
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4
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Bacterial Transcriptional Regulators: A Road Map for Functional, Structural, and Biophysical Characterization. Int J Mol Sci 2022; 23:ijms23042179. [PMID: 35216300 PMCID: PMC8879271 DOI: 10.3390/ijms23042179] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 02/11/2022] [Accepted: 02/11/2022] [Indexed: 12/12/2022] Open
Abstract
The different niches through which bacteria move during their life cycle require a fast response to the many environmental queues they encounter. The sensing of these stimuli and their correct response is driven primarily by transcriptional regulators. This kind of protein is involved in sensing a wide array of chemical species, a process that ultimately leads to the regulation of gene transcription. The allosteric-coupling mechanism of sensing and regulation is a central aspect of biological systems and has become an important field of research during the last decades. In this review, we summarize the state-of-the-art techniques applied to unravel these complex mechanisms. We introduce a roadmap that may serve for experimental design, depending on the answers we seek and the initial information we have about the system of study. We also provide information on databases containing available structural information on each family of transcriptional regulators. Finally, we discuss the recent results of research about the allosteric mechanisms of sensing and regulation involving many transcriptional regulators of interest, highlighting multipronged strategies and novel experimental techniques. The aim of the experiments discussed here was to provide a better understanding at a molecular level of how bacteria adapt to the different environmental threats they face.
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5
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Metsla K, Kirss S, Laks K, Sildnik G, Palgi M, Palumaa T, Tõugu V, Palumaa P. α-Lipoic Acid Has the Potential to Normalize Copper Metabolism, Which Is Dysregulated in Alzheimer's Disease. J Alzheimers Dis 2021; 85:715-728. [PMID: 34864665 DOI: 10.3233/jad-215026] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Alzheimer's disease (AD) is an age-dependent progressive neurodegenerative disorder and the most common cause of dementia. The treatment and prevention of AD present immense yet unmet needs. One of the hallmarks of AD is the formation of extracellular amyloid plaques in the brain, composed of amyloid-β (Aβ) peptides. Besides major amyloid-targeting approach there is the necessity to focus also on alternative therapeutic strategies. One factor contributing to the development of AD is dysregulated copper metabolism, reflected in the intracellular copper deficit and excess of extracellular copper. OBJECTIVE In the current study, we follow the widely accepted hypothesis that the normalization of copper metabolism leads to the prevention or slowing of the disease and search for new copper-regulating ligands. METHODS We used cell culture, ICP MS, and Drosophila melanogaster models of AD. RESULTS We demonstrate that the natural intracellular copper chelator, α-lipoic acid (LA) translocates copper from extracellular to intracellular space in an SH-SY5Y-based neuronal cell model and is thus suitable to alleviate the intracellular copper deficit characteristic of AD neurons. Furthermore, we show that supplementation with LA protects the Drosophila melanogaster models of AD from developing AD phenotype by improving locomotor activity of fruit fly with overexpression of human Aβ with Iowa mutation in the fly brain. In addition, LA slightly weakens copper-induced smooth eye phenotype when amyloid-β protein precursor (AβPP) and beta-site AβPP cleaving enzyme 1 (BACE1) are overexpressed in eye photoreceptor cells. CONCLUSION Collectively, these results provide evidence that LA has the potential to normalize copper metabolism in AD.
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Affiliation(s)
- Kristel Metsla
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
| | - Sigrid Kirss
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
| | - Katrina Laks
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
| | - Gertrud Sildnik
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
| | - Mari Palgi
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
| | - Teele Palumaa
- East Tallinn Central Hospital Eye Clinic, Tallinn, Estonia
| | - Vello Tõugu
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
| | - Peep Palumaa
- Department of Chemistry and Biotechnology, Tallinn University of Technology, Tallinn, Estonia
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6
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Principles and practice of determining metal-protein affinities. Biochem J 2021; 478:1085-1116. [PMID: 33710331 PMCID: PMC7959690 DOI: 10.1042/bcj20200838] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/05/2021] [Accepted: 02/11/2021] [Indexed: 01/02/2023]
Abstract
Metal ions play many critical roles in biology, as structural and catalytic cofactors, and as cell regulatory and signalling elements. The metal–protein affinity, expressed conveniently by the metal dissociation constant, KD, describes the thermodynamic strength of a metal–protein interaction and is a key parameter that can be used, for example, to understand how proteins may acquire metals in a cell and to identify dynamic elements (e.g. cofactor binding, changing metal availabilities) which regulate protein metalation in vivo. Here, we outline the fundamental principles and practical considerations that are key to the reliable quantification of metal–protein affinities. We review a selection of spectroscopic probes which can be used to determine protein affinities for essential biological transition metals (including Mn(II), Fe(II), Co(II), Ni(II), Cu(I), Cu(II) and Zn(II)) and, using selected examples, demonstrate how rational probe selection combined with prudent experimental design can be applied to determine accurate KD values.
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7
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Calculating metalation in cells reveals CobW acquires Co II for vitamin B 12 biosynthesis while related proteins prefer Zn II. Nat Commun 2021; 12:1195. [PMID: 33608553 PMCID: PMC7895991 DOI: 10.1038/s41467-021-21479-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2020] [Accepted: 01/25/2021] [Indexed: 02/01/2023] Open
Abstract
Protein metal-occupancy (metalation) in vivo has been elusive. To address this challenge, the available free energies of metals have recently been determined from the responses of metal sensors. Here, we use these free energy values to develop a metalation-calculator which accounts for inter-metal competition and changing metal-availabilities inside cells. We use the calculator to understand the function and mechanism of GTPase CobW, a predicted CoII-chaperone for vitamin B12. Upon binding nucleotide (GTP) and MgII, CobW assembles a high-affinity site that can obtain CoII or ZnII from the intracellular milieu. In idealised cells with sensors at the mid-points of their responses, competition within the cytosol enables CoII to outcompete ZnII for binding CobW. Thus, CoII is the cognate metal. However, after growth in different [CoII], CoII-occupancy ranges from 10 to 97% which matches CobW-dependent B12 synthesis. The calculator also reveals that related GTPases with comparable ZnII affinities to CobW, preferentially acquire ZnII due to their relatively weaker CoII affinities. The calculator is made available here for use with other proteins.
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8
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Osman D, Cooke A, Young TR, Deery E, Robinson NJ, Warren MJ. The requirement for cobalt in vitamin B 12: A paradigm for protein metalation. BIOCHIMICA ET BIOPHYSICA ACTA. MOLECULAR CELL RESEARCH 2021; 1868:118896. [PMID: 33096143 PMCID: PMC7689651 DOI: 10.1016/j.bbamcr.2020.118896] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 10/13/2020] [Accepted: 10/14/2020] [Indexed: 12/20/2022]
Abstract
Vitamin B12, cobalamin, is a cobalt-containing ring-contracted modified tetrapyrrole that represents one of the most complex small molecules made by nature. In prokaryotes it is utilised as a cofactor, coenzyme, light sensor and gene regulator yet has a restricted role in assisting only two enzymes within specific eukaryotes including mammals. This deployment disparity is reflected in another unique attribute of vitamin B12 in that its biosynthesis is limited to only certain prokaryotes, with synthesisers pivotal in establishing mutualistic microbial communities. The core component of cobalamin is the corrin macrocycle that acts as the main ligand for the cobalt. Within this review we investigate why cobalt is paired specifically with the corrin ring, how cobalt is inserted during the biosynthetic process, how cobalt is made available within the cell and explore the cellular control of cobalt and cobalamin levels. The partitioning of cobalt for cobalamin biosynthesis exemplifies how cells assist metalation.
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Affiliation(s)
- Deenah Osman
- Department of Biosciences, Durham University, Durham DH1 3LE, UK; Department of Chemistry, Durham University, Durham DH1 3LE, UK.
| | - Anastasia Cooke
- School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK.
| | - Tessa R Young
- Department of Biosciences, Durham University, Durham DH1 3LE, UK; Department of Chemistry, Durham University, Durham DH1 3LE, UK.
| | - Evelyne Deery
- School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK.
| | - Nigel J Robinson
- Department of Biosciences, Durham University, Durham DH1 3LE, UK; Department of Chemistry, Durham University, Durham DH1 3LE, UK.
| | - Martin J Warren
- School of Biosciences, University of Kent, Canterbury, Kent CT2 7NJ, UK; Quadram Institute Bioscience, Norwich Research Park, Norwich NR4 7UQ, UK; Biomedical Research Centre, University of East Anglia, Norwich NR4 7TJ, UK.
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9
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Arias-Olivares D, Wieduwilt EK, Contreras-García J, Genoni A. NCI-ELMO: A New Method To Quickly and Accurately Detect Noncovalent Interactions in Biosystems. J Chem Theory Comput 2019; 15:6456-6470. [DOI: 10.1021/acs.jctc.9b00658] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- David Arias-Olivares
- Doctorado en Fisicoquímica Molecular, Facultad de Ciencias Exactas, Universidad Andrés Bello, Ave. Republica 275, Santiago, Chile
- Sorbonne Université & CNRS, Laboratoire de Chimie Théorique, UMR CNRS 7616, 4 Place Jussieu, F-75005 Paris, France
| | - Erna K. Wieduwilt
- Université de Lorraine & CNRS, Laboratoire de Physique et Chimie Théoriques, UMR CNRS 7019, 1 Boulevard Arago, F-57078 Metz, France
| | - Julia Contreras-García
- Sorbonne Université & CNRS, Laboratoire de Chimie Théorique, UMR CNRS 7616, 4 Place Jussieu, F-75005 Paris, France
| | - Alessandro Genoni
- Université de Lorraine & CNRS, Laboratoire de Physique et Chimie Théoriques, UMR CNRS 7019, 1 Boulevard Arago, F-57078 Metz, France
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10
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Exploring the role of the various methionine residues in the Escherichia coli CusB adapter protein. PLoS One 2019; 14:e0219337. [PMID: 31465444 PMCID: PMC6715271 DOI: 10.1371/journal.pone.0219337] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 08/15/2019] [Indexed: 11/29/2022] Open
Abstract
The dissemination of resistant pathogenic microbes has become one of the most challenging problems that modern medicine has faced. Developing novel drugs based on new molecular targets that previously were not targeted, is therefore the highest priority in antibiotics research. One approach that has been recently suggested is to inhibit copper transporters in prokaryotic systems. Copper is required for many biological pathways, but sometimes it can harm the cell. Pathogenic systems have a highly sophisticated copper-regulation network; therefore, a better understanding of how this network operates at the molecular level should assist in developing the next generation of antibiotics. The CusB protein is part of the CusCBA periplasmic Cu(I) efflux system in Gram-negative bacteria, and was recently reported to play a key role in the functioning of the whole CusCBA system, in which conformational changes as well as the assembly/disassembly process control the opening of the transporter. More knowledge of the underlying mechanism is needed to attain a full understanding of CusB functioning, which is associated with targeting specific and crucial residues in CusB. Here, we combine in-vitro structural measurements, which use EPR spectroscopy and UV-Vis measurements, with cell experiments to explore the role of the various methionine residues in CusB. We targeted two methionine residues (M227 and M241) that are essential for the proper functioning of CusB.
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11
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August A, Schmidt N, Klingler J, Baumkötter F, Lechner M, Klement J, Eggert S, Vargas C, Wild K, Keller S, Kins S. Copper and zinc ions govern the trans‐directed dimerization of APP family members in multiple ways. J Neurochem 2019; 151:626-641. [DOI: 10.1111/jnc.14716] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Revised: 04/29/2019] [Accepted: 04/29/2019] [Indexed: 12/21/2022]
Affiliation(s)
- Alexander August
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Nadine Schmidt
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Johannes Klingler
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Frederik Baumkötter
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Marius Lechner
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Jessica Klement
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Simone Eggert
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Carolyn Vargas
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Klemens Wild
- Heidelberg University Biochemistry Center (BZH) University of Heidelberg Heidelberg Germany
| | - Sandro Keller
- Molecular Biophysics Technische Universität Kaiserslautern (TUK) Kaiserslautern Germany
| | - Stefan Kins
- Division of Human Biology and Human GeneticsTechnische Universität Kaiserslautern (TUK) Kaiserslautern Germany
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12
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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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13
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Morgan MT, Yang B, Harankhedkar S, Nabatilan A, Bourassa D, McCallum AM, Sun F, Wu R, Forest CR, Fahrni CJ. Stabilization of Aliphatic Phosphines by Auxiliary Phosphine Sulfides Offers Zeptomolar Affinity and Unprecedented Selectivity for Probing Biological Cu I. Angew Chem Int Ed Engl 2018; 57:9711-9715. [PMID: 29885022 PMCID: PMC6105516 DOI: 10.1002/anie.201804072] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Revised: 06/01/2018] [Indexed: 01/06/2023]
Abstract
Full elucidation of the functions and homeostatic pathways of biological copper requires tools that can selectively recognize and manipulate this trace nutrient within living cells and tissues, where it exists primarily as CuI . Buffered at attomolar concentrations, intracellular CuI is, however, not readily accessible to commonly employed amine and thioether-based chelators. Herein, we reveal a chelator design strategy in which phosphine sulfides aid in CuI coordination while simultaneously stabilizing aliphatic phosphine donors, producing a charge-neutral ligand with low-zeptomolar dissociation constant and 1017 -fold selectivity for CuI over ZnII , FeII , and MnII . As illustrated by reversing ATP7A trafficking in cells and blocking long-term potentiation of neurons in mouse hippocampal brain tissue, the ligand is capable of intercepting copper-dependent processes. The phosphine sulfide-stabilized phosphine (PSP) design approach, which confers resistance towards protonation, dioxygen, and disulfides, could be readily expanded towards ligands and probes with tailored properties for exploring CuI in a broad range of biological systems.
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Affiliation(s)
- M. Thomas Morgan
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
| | - Bo Yang
- Prof. Dr. C.R. Forest, Dr. B. Yang G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology 315 Ferst Drive, Atlanta, GA 30332, USA,
| | - Shefali Harankhedkar
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
| | - Arielle Nabatilan
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
| | - Daisy Bourassa
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
| | - Adam M. McCallum
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
| | - Fangxu Sun
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
| | - Ronghu Wu
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
| | - Craig R. Forest
- Prof. Dr. C.R. Forest, Dr. B. Yang G. W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology 315 Ferst Drive, Atlanta, GA 30332, USA,
| | - Christoph J. Fahrni
- Prof. Dr. C.J. Fahrni, Prof. Dr. R. Wu, Dr. M.T. Morgan, Dr. S Harankhedkar, A. Nabatilan, Dr. D. Bourassa, Dr. A.M. McCallum, F. Sun School of Chemistry and Biochemistry, Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology 901 Atlantic Drive, Atlanta, GA 30332, USA,
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14
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Morgan MT, Yang B, Harankhedkar S, Nabatilan A, Bourassa D, McCallum AM, Sun F, Wu R, Forest CR, Fahrni CJ. Stabilization of Aliphatic Phosphines by Auxiliary Phosphine Sulfides Offers Zeptomolar Affinity and Unprecedented Selectivity for Probing Biological Cu
I. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804072] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- M. Thomas Morgan
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
| | - Bo Yang
- G. W. Woodruff School of Mechanical Engineering Georgia Institute of Technology 315 Ferst Drive Atlanta GA 30332 USA
| | - Shefali Harankhedkar
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
| | - Arielle Nabatilan
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
| | - Daisy Bourassa
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
| | - Adam M. McCallum
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
| | - Fangxu Sun
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
| | - Ronghu Wu
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
| | - Craig R. Forest
- G. W. Woodruff School of Mechanical Engineering Georgia Institute of Technology 315 Ferst Drive Atlanta GA 30332 USA
| | - Christoph J. Fahrni
- School of Chemistry and Biochemistry Petit Institute for Bioengineering and Bioscience Georgia Institute of Technology 901 Atlantic Drive Atlanta GA 30332 USA
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15
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Young TR, Pukala TL, Cappai R, Wedd AG, Xiao Z. The Human Amyloid Precursor Protein Binds Copper Ions Dominated by a Picomolar-Affinity Site in the Helix-Rich E2 Domain. Biochemistry 2018; 57:4165-4176. [DOI: 10.1021/acs.biochem.8b00572] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Tessa R. Young
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Tara L. Pukala
- Discipline of Chemistry, The University of Adelaide, Adelaide, SA 5005, Australia
| | - Roberto Cappai
- Department of Pharmacology and Therapeutics, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Anthony G. Wedd
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria 3010, Australia
- Melbourne Dementia Research Centre, Florey Institute of Neuroscience and Mental Health, The University of Melbourne, Parkville, Victoria 3052, Australia
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