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Ekanayake RSK, Streltsov VA, Best SP, Chantler CT. Nanostructure and dynamics of N-truncated copper amyloid-β peptides from advanced X-ray absorption fine structure. IUCRJ 2024; 11:325-346. [PMID: 38602752 PMCID: PMC11067746 DOI: 10.1107/s2052252524001830] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Accepted: 02/26/2024] [Indexed: 04/12/2024]
Abstract
An X-ray absorption spectroscopy (XAS) electrochemical cell was used to collect high-quality XAS measurements of N-truncated Cu:amyloid-β (Cu:Aβ) samples under near-physiological conditions. N-truncated Cu:Aβ peptide complexes contribute to oxidative stress and neurotoxicity in Alzheimer's patients' brains. However, the redox properties of copper in different Aβ peptide sequences are inconsistent. Therefore, the geometry of binding sites for the copper binding in Aβ4-8/12/16 was determined using novel advanced extended X-ray absorption fine structure (EXAFS) analysis. This enables these peptides to perform redox cycles in a manner that might produce toxicity in human brains. Fluorescence XAS measurements were corrected for systematic errors including defective-pixel data, monochromator glitches and dispersion of pixel spectra. Experimental uncertainties at each data point were measured explicitly from the point-wise variance of corrected pixel measurements. The copper-binding environments of Aβ4-8/12/16 were precisely determined by fitting XAS measurements with propagated experimental uncertainties, advanced analysis and hypothesis testing, providing a mechanism to pursue many similarly complex questions in bioscience. The low-temperature XAS measurements here determine that CuII is bound to the first amino acids in the high-affinity amino-terminal copper and nickel (ATCUN) binding motif with an oxygen in a tetragonal pyramid geometry in the Aβ4-8/12/16 peptides. Room-temperature XAS electrochemical-cell measurements observe metal reduction in the Aβ4-16 peptide. Robust investigations of XAS provide structural details of CuII binding with a very different bis-His motif and a water oxygen in a quasi-tetrahedral geometry. Oxidized XAS measurements of Aβ4-12/16 imply that both CuII and CuIII are accommodated in an ATCUN-like binding site. Hypotheses for these CuI, CuII and CuIII geometries were proven and disproven using the novel data and statistical analysis including F tests. Structural parameters were determined with an accuracy some tenfold better than literature claims of past work. A new protocol was also developed using EXAFS data analysis for monitoring radiation damage. This gives a template for advanced analysis of complex biosystems.
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Affiliation(s)
| | - Victor A. Streltsov
- School of Physics, University of Melbourne, Australia
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
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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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De Santis E, Alleva S, Minicozzi V, Morante S, Stellato F. Probing the Dynamic Landscape: From Static to Time-Resolved X-Ray Absorption Spectroscopy to Investigate Copper Redox Chemistry in Neurodegenerative Disorders. Chempluschem 2024:e202300712. [PMID: 38526934 DOI: 10.1002/cplu.202300712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 03/22/2024] [Accepted: 03/25/2024] [Indexed: 03/27/2024]
Abstract
Copper (Cu), with its ability to exist in various oxidation states, notably Cu(I) and Cu(II), plays a crucial role in diverse biological redox reactions. This includes its involvement in pathways associated with oxidative stress in neurodegenerative disorders such as Alzheimer's disease, Parkinson's disease, and Transmissible Spongiform Encephalopathies. This paper offers an overview of X-ray Absorption Spectroscopy (XAS) studies designed to elucidate the interactions between Cu ions and proteins or peptides associated with these neurodegenerative diseases. The emphasis lies on XAS specificity, revealing the local coordination environment, and on its sensitivity to Cu oxidation states. Furthermore, the paper focuses on XAS applications targeting the characterization of intermediate reaction states and explores the opportunities arising from recent advancements in time-resolved XAS at ultrabright synchrotron and Free Electron Laser radiation sources.
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Affiliation(s)
- Emiliano De Santis
- Department of Chemistry-BMC, Uppsala University, Box 576, SE-751 23, Uppsala, Sweden
| | - Stefania Alleva
- Department of Physics, University of Rome, Tor Vergata, Rome, 00133, Italy
- INFN, Rome, Tor Vergata, Rome, 00133, Italy
| | - Velia Minicozzi
- Department of Physics, University of Rome, Tor Vergata, Rome, 00133, Italy
- INFN, Rome, Tor Vergata, Rome, 00133, Italy
| | - Silvia Morante
- Department of Physics, University of Rome, Tor Vergata, Rome, 00133, Italy
- INFN, Rome, Tor Vergata, Rome, 00133, Italy
| | - Francesco Stellato
- Department of Physics, University of Rome, Tor Vergata, Rome, 00133, Italy
- INFN, Rome, Tor Vergata, Rome, 00133, Italy
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4
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Ekanayake RSK, Streltsov VA, Best SP, Chantler CT. Using XAS to monitor radiation damage in real time and post-analysis, and investigation of systematic errors of fluorescence XAS for Cu-bound amyloid-β. J Appl Crystallogr 2024; 57:125-139. [PMID: 38322727 PMCID: PMC10840304 DOI: 10.1107/s1600576723010890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Accepted: 12/20/2023] [Indexed: 02/08/2024] Open
Abstract
X-ray absorption spectroscopy (XAS) is a promising technique for determining structural information from sensitive biological samples, but high-accuracy X-ray absorption fine structure (XAFS) requires corrections of systematic errors in experimental data. Low-temperature XAS and room-temperature X-ray absorption spectro-electrochemical (XAS-EC) measurements of N-truncated amyloid-β samples were collected and corrected for systematic effects such as dead time, detector efficiencies, monochromator glitches, self-absorption, radiation damage and noise at higher wavenumber (k). A new protocol was developed using extended X-ray absorption fine structure (EXAFS) data analysis for monitoring radiation damage in real time and post-analysis. The reliability of the structural determinations and consistency were validated using the XAS measurement experimental uncertainty. The correction of detector pixel efficiencies improved the fitting χ2 by 12%. An improvement of about 2.5% of the structural fitting was obtained after dead-time corrections. Normalization allowed the elimination of 90% of the monochromator glitches. The remaining glitches were manually removed. The dispersion of spectra due to self-absorption was corrected. Standard errors of experimental measurements were propagated from pointwise variance of the spectra after systematic corrections. Calculated uncertainties were used in structural refinements for obtaining precise and reliable values of structural parameters including atomic bond lengths and thermal parameters. This has permitted hypothesis testing.
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Affiliation(s)
| | - Victor A. Streltsov
- School of Physics, University of Melbourne, Australia
- The Florey Institute of Neuroscience and Mental Health, University of Melbourne, Australia
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5
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Falcone E, Nobili G, Okafor M, Proux O, Rossi G, Morante S, Faller P, Stellato F. Chasing the Elusive "In-Between" State of the Copper-Amyloid β Complex by X-ray Absorption through Partial Thermal Relaxation after Photoreduction. Angew Chem Int Ed Engl 2023; 62:e202217791. [PMID: 36869617 DOI: 10.1002/anie.202217791] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2022] [Revised: 03/03/2023] [Accepted: 03/03/2023] [Indexed: 03/05/2023]
Abstract
The redox activity of Cu ions bound to the amyloid-β (Aβ) peptide is implicated as a source of oxidative stress in the context of Alzheimer's disease. In order to explain the efficient redox cycling between CuII -Aβ (distorted square-pyramidal) and CuI -Aβ (digonal) resting states, the existence of a low-populated "in-between" state, prone to bind Cu in both oxidation states, has been postulated. Here, we exploited the partial X-ray induced photoreduction at 10 K, followed by a thermal relaxation at 200 K, to trap and characterize by X-ray Absorption Spectroscopy (XAS) a partially reduced Cu-Aβ1-16 species different from the resting states. Remarkably, the XAS spectrum is well-fitted by a previously proposed model of the "in-between" state, hence providing the first direct spectroscopic characterization of an intermediate state. The present approach could be used to explore and identify the catalytic intermediates of other relevant metal complexes.
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Affiliation(s)
- Enrico Falcone
- Institut de Chimie (UMR 7177), University of Strasbourg, CNRS, 4 Rue Blaise Pascal, 67081, Strasbourg, France
| | - Germano Nobili
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
| | - Michael Okafor
- Institut de Chimie (UMR 7177), University of Strasbourg, CNRS, 4 Rue Blaise Pascal, 67081, Strasbourg, France
| | - Olivier Proux
- Observatoire des Sciences de l'Univers de Grenoble, UMS 832 CNRS-Université Grenoble Alpes, 38041, Grenoble, France
| | - Giancarlo Rossi
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- Centro Fermi, Museo Storico della Fisica e Centro Studi e Ricerche Enrico Fermi, Via Panisperna 89a, 00184, Roma, Italy
| | - Silvia Morante
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
| | - Peter Faller
- Institut de Chimie (UMR 7177), University of Strasbourg, CNRS, 4 Rue Blaise Pascal, 67081, Strasbourg, France
- Institut Universitaire de France (IUF), 1 rue Descartes, 75231, Paris, France
| | - Francesco Stellato
- Università di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
- INFN, Sezione di Roma Tor Vergata, Via della Ricerca Scientifica, 00133, Roma, Italy
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6
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Yi Y, Lim MH. Current understanding of metal-dependent amyloid-β aggregation and toxicity. RSC Chem Biol 2023; 4:121-131. [PMID: 36794021 PMCID: PMC9906324 DOI: 10.1039/d2cb00208f] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2022] [Accepted: 11/22/2022] [Indexed: 11/23/2022] Open
Abstract
The discovery of effective therapeutics targeting amyloid-β (Aβ) aggregates for Alzheimer's disease (AD) has been very challenging, which suggests its complicated etiology associated with multiple pathogenic elements. In AD-affected brains, highly concentrated metals, such as copper and zinc, are found in senile plaques mainly composed of Aβ aggregates. These metal ions are coordinated to Aβ and affect its aggregation and toxicity profiles. In this review, we illustrate the current view on molecular insights into the assembly of Aβ peptides in the absence and presence of metal ions as well as the effect of metal ions on their toxicity.
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Affiliation(s)
- Yelim Yi
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
| | - Mi Hee Lim
- Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST) Daejeon 34141 Republic of Korea
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7
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Interplay of electronic and geometric structure on Cu phenanthroline, bipyridine and derivative complexes, synthesis, characterization, and reactivity towards oxygen. Coord Chem Rev 2023. [DOI: 10.1016/j.ccr.2022.214943] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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8
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Why the Ala-His-His Peptide Is an Appropriate Scaffold to Remove and Redox Silence Copper Ions from the Alzheimer’s-Related Aβ Peptide. Biomolecules 2022; 12:biom12101327. [PMID: 36291536 PMCID: PMC9599918 DOI: 10.3390/biom12101327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2022] [Revised: 09/09/2022] [Accepted: 09/13/2022] [Indexed: 11/17/2022] Open
Abstract
The progressive, neurodegenerative Alzheimer’s disease (AD) is the most widespread dementia. Due to the ageing of the population and the current lack of molecules able to prevent or stop the disease, AD will be even more impactful for society in the future. AD is a multifactorial disease, and, among other factors, metal ions have been regarded as potential therapeutic targets. This is the case for the redox-competent Cu ions involved in the production of reactive oxygen species (ROS) when bound to the Alzheimer-related Aβ peptide, a process that contributes to the overall oxidative stress and inflammation observed in AD. Here, we made use of peptide ligands to stop the Cu(Aβ)-induced ROS production and we showed why the AHH sequence is fully appropriate, while the two parents, AH and AAH, are not. The AHH peptide keeps its beneficial ability against Cu(Aβ)-induced ROS, even in the presence of ZnII-competing ions and other biologically relevant ions. The detailed kinetic mechanism by which AHH could exert its action against Cu(Aβ)-induced ROS is also proposed.
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9
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Lee YJ, Kim H, Kim Y, Cho KH, Hong S, Nam KT, Kim SH, Choi CH, Seo J. Repurposing a peptide antibiotic as a catalyst: a multicopper–daptomycin complex as a cooperative O–O bond formation and activation catalyst. Inorg Chem Front 2022. [DOI: 10.1039/d2qi01440h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A peptide antibiotic, daptomycin, was repurposed to a multicopper catalyst presenting cooperative rate enhancement in O–O bond formation and activation reactions.
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Affiliation(s)
- Yen Jea Lee
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Haesol Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
| | - Yujeong Kim
- Western Seoul Center, Korea Basic Science Institute, Seoul 03759, Republic of Korea
| | - Kang Hee Cho
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Sugyeong Hong
- Western Seoul Center, Korea Basic Science Institute, Seoul 03759, Republic of Korea
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Ki Tae Nam
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
| | - Sun Hee Kim
- Western Seoul Center, Korea Basic Science Institute, Seoul 03759, Republic of Korea
- Department of Chemistry and Nano Science, Ewha Womans University, Seoul 03760, Republic of Korea
| | - Chang Hyuck Choi
- Department of Chemistry, Pohang University of Science and Technology, Pohang 37673, Republic of Korea
| | - Jiwon Seo
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju 61005, Republic of Korea
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10
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Ekanayake RSK, Chantler CT, Sier D, Schalken MJ, Illig AJ, de Jonge MD, Johannessen B, Kappen P, Tran CQ. High-accuracy measurement of mass attenuation coefficients and the imaginary component of the atomic form factor of zinc from 8.51 keV to 11.59 keV, and X-ray absorption fine structure with investigation of zinc theory and nanostructure. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:1492-1503. [PMID: 34475296 DOI: 10.1107/s1600577521005981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Accepted: 06/08/2021] [Indexed: 06/13/2023]
Abstract
High-accuracy X-ray mass attenuation coefficients were measured from the first X-ray Extended Range Technique (XERT)-like experiment at the Australian Synchrotron. Experimentally measured mass attenuation coefficients deviate by ∼50% from the theoretical values near the zinc absorption edge, suggesting that improvements in theoretical tabulations of mass attenuation coefficients are required to bring them into better agreement with experiment. Using these values the imaginary component of the atomic form factor of zinc was determined for all the measured photon energies. The zinc K-edge jump ratio and jump factor are determined and results raise significant questions regarding the definitions of quantities used and best practice for background subtraction prior to X-ray absorption fine-structure (XAFS) analysis. The XAFS analysis shows excellent agreement between the measured and tabulated values and yields bond lengths and nanostructure of zinc with uncertainties of from 0.1% to 0.3% or 0.003 Å to 0.008 Å. Significant variation from the reported crystal structure was observed, suggesting local dynamic motion of the standard crystal lattice. XAFS is sensitive to dynamic correlated motion and in principle is capable of observing local dynamic motion beyond the reach of conventional crystallography. These results for the zinc absorption coefficient, XAFS and structure are the most accurate structural refinements of zinc at room temperature.
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Affiliation(s)
| | | | - Daniel Sier
- School of Physics, University of Melbourne, Australia
| | | | | | | | | | - Peter Kappen
- ANSTO, Australian Synchrotron, Melbourne, Australia
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11
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Oxidase Reactivity of Cu II Bound to N-Truncated Aβ Peptides Promoted by Dopamine. Int J Mol Sci 2021; 22:ijms22105190. [PMID: 34068879 PMCID: PMC8155989 DOI: 10.3390/ijms22105190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2021] [Revised: 05/10/2021] [Accepted: 05/12/2021] [Indexed: 12/18/2022] Open
Abstract
The redox chemistry of copper(II) is strongly modulated by the coordination to amyloid-β peptides and by the stability of the resulting complexes. Amino-terminal copper and nickel binding motifs (ATCUN) identified in truncated Aβ sequences starting with Phe4 show very high affinity for copper(II) ions. Herein, we study the oxidase activity of [Cu–Aβ4−x] and [Cu–Aβ1−x] complexes toward dopamine and other catechols. The results show that the CuII–ATCUN site is not redox-inert; the reduction of the metal is induced by coordination of catechol to the metal and occurs through an inner sphere reaction. The generation of a ternary [CuII–Aβ–catechol] species determines the efficiency of the oxidation, although the reaction rate is ruled by reoxidation of the CuI complex. In addition to the N-terminal coordination site, the two vicinal histidines, His13 and His14, provide a second Cu-binding motif. Catechol oxidation studies together with structural insight from the mixed dinuclear complexes Ni/Cu–Aβ4−x reveal that the His-tandem is able to bind CuII ions independently of the ATCUN site, but the N-terminal metal complexation reduces the conformational mobility of the peptide chain, preventing the binding and oxidative reactivity toward catechol of CuII bound to the secondary site.
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12
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Best SP, Streltsov VA, Chantler CT, Li W, Ash PA, Hayama S, Diaz-Moreno S. Redox state and photoreduction control using X-ray spectroelectrochemical techniques - advances in design and fabrication through additive engineering. JOURNAL OF SYNCHROTRON RADIATION 2021; 28:472-479. [PMID: 33650559 DOI: 10.1107/s1600577520016021] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2020] [Accepted: 12/08/2020] [Indexed: 06/12/2023]
Abstract
The design and performance of an electrochemical cell and solution flow system optimized for the collection of X-ray absorption spectra from solutions of species sensitive to photodamage is described. A combination of 3D CAD and 3D printing techniques facilitates highly optimized design with low unit cost and short production time. Precise control of the solution flow is critical to both minimizing the volume of solution needed and minimizing the photodamage that occurs during data acquisition. The details of an integrated four-syringe stepper-motor-driven pump and associated software are described. It is shown that combined electrochemical and flow control can allow repeated measurement of a defined volume of solution, 100 µl, of samples sensitive to photoreduction without significant change to the X-ray absorption near-edge structure and is demonstrated by measurements of copper(II) complexes. The flow in situ electrochemical cell allows the collection of high-quality X-ray spectral measurements both in the near-edge region and over an extended energy region as is needed for structural analysis from solution samples. This approach provides control over photodamage at a level at least comparable with that achieved using cryogenic techniques and at the same time eliminates problems associated with interference due to Bragg peaks.
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Affiliation(s)
- Stephen Peter Best
- School of Chemistry, The University of Melbourne, Parkville, Melbourne, Victoria 3010, Australia
| | - Victor A Streltsov
- Florey Department of Neuroscience and Mental Health, The University of Melbourne, Melbourne, Victoria 3010, Australia
| | | | - Wangzhe Li
- Department of Chemistry, University of Oxford, Oxford OX1 3QR, United Kingdom
| | - Philip A Ash
- Department of Chemistry, University of Leicester, Leicester LE1 7RH, United Kingdom
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13
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de Jesus JR, Arruda MAZ. Unravelling neurological disorders through metallomics-based approaches. Metallomics 2020; 12:1878-1896. [PMID: 33237082 DOI: 10.1039/d0mt00234h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Understanding the biological process involving metals and biomolecules in the brain is essential for establishing the origin of neurological disorders, such as neurodegenerative and psychiatric diseases. From this perspective, this critical review presents recent advances in this topic, showing possible mechanisms involving the disruption of metal homeostasis and the pathogenesis of neurological disorders. We also discuss the main challenges observed in metallomics studies associated with neurological disorders, including those related to sample preparation and analyte quantification.
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14
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Esmieu C, Ferrand G, Borghesani V, Hureau C. Impact of N-Truncated Aβ Peptides on Cu- and Cu(Aβ)-Generated ROS: Cu I Matters! Chemistry 2020; 27:1777-1786. [PMID: 33058356 DOI: 10.1002/chem.202003949] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Revised: 10/07/2020] [Indexed: 12/15/2022]
Abstract
In vitro Cu(Aβ1-x )-induced ROS production has been extensively studied. Conversely, the ability of N-truncated isoforms of Aβ to alter the Cu-induced ROS production has been overlooked, even though they are main constituents of amyloid plaques found in the human brain. N-Truncated peptides at the positions 4 and 11 (Aβ4-x and Aβ11-x ) contain an amino-terminal copper and nickel (ATCUN) binding motif (H2 N-Xxx-Zzz-His) that confer them different coordination sites and higher affinities for CuII compared to the Aβ1-x peptide. It has further been proposed that the role of Aβ4-x peptide is to quench CuII toxicity in the brain. However, the role of CuI coordination has not been investigated to date. In contrast to CuII , CuI coordination is expected to be the same for N-truncated and N-intact peptides. Herein, we report in-depth characterizations and ROS production studies of Cu (CuI and CuII ) complexes of the Aβ4-16 and Aβ11-16 N-truncated peptides. Our findings show that the N-truncated peptides do produce ROS when CuI is present in the medium, albeit to a lesser extent than the unmodified counterpart. In addition, when used as competitor ligands (i.e., in the presence of Aβ1-16 ), the N-truncated peptides are not able to fully preclude Cu(Aβ1-16 )-induced ROS production.
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Affiliation(s)
- Charlène Esmieu
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France
| | - Guillaume Ferrand
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France.,UPS, INPT, University of Toulouse, 31077, Toulouse Cedex 4, France
| | - Valentina Borghesani
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France.,UPS, INPT, University of Toulouse, 31077, Toulouse Cedex 4, France.,current address: School of Chemistry, University of Birmingham, Edgbaston, B15 2TT, UK
| | - Christelle Hureau
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099 31077, Toulouse Cedex 4, France.,UPS, INPT, University of Toulouse, 31077, Toulouse Cedex 4, France
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15
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Kotuniak R, Strampraad MJF, Bossak‐Ahmad K, Wawrzyniak UE, Ufnalska I, Hagedoorn P, Bal W. Key Intermediate Species Reveal the Copper(II)-Exchange Pathway in Biorelevant ATCUN/NTS Complexes. Angew Chem Int Ed Engl 2020; 59:11234-11239. [PMID: 32267054 PMCID: PMC7383912 DOI: 10.1002/anie.202004264] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Indexed: 01/31/2023]
Abstract
The amino-terminal copper and nickel/N-terminal site (ATCUN/NTS) present in proteins and bioactive peptides exhibits high affinity towards CuII ions and have been implicated in human copper physiology. Little is known, however, about the rate and exact mechanism of formation of such complexes. We used the stopped-flow and microsecond freeze-hyperquenching (MHQ) techniques supported by steady-state spectroscopic and electrochemical data to demonstrate the formation of partially coordinated intermediate CuII complexes formed by glycyl-glycyl-histidine (GGH) peptide, the simplest ATCUN/NTS model. One of these novel intermediates, characterized by two-nitrogen coordination, t1/2 ≈100 ms at pH 6.0 and the ability to maintain the CuII /CuI redox pair is the best candidate for the long-sought reactive species in extracellular copper transport.
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Affiliation(s)
- Radosław Kotuniak
- Department of BiophysicsInstitute of Biochemistry and Biophysics Polish Academy of SciencesPawińskiego 5a02-106WarsawPoland
| | - Marc J. F. Strampraad
- Department of BiotechnologyDelft University of TechnologyVan der Maasweg 92629HZDelftThe Netherlands
| | - Karolina Bossak‐Ahmad
- Department of BiophysicsInstitute of Biochemistry and Biophysics Polish Academy of SciencesPawińskiego 5a02-106WarsawPoland
| | - Urszula E. Wawrzyniak
- Chair of Medical BiotechnologyFaculty of ChemistryWarsaw University of TechnologyNoakowskiego 300-664WarsawPoland
| | - Iwona Ufnalska
- Chair of Medical BiotechnologyFaculty of ChemistryWarsaw University of TechnologyNoakowskiego 300-664WarsawPoland
| | - Peter‐Leon Hagedoorn
- Department of BiotechnologyDelft University of TechnologyVan der Maasweg 92629HZDelftThe Netherlands
| | - Wojciech Bal
- Department of BiophysicsInstitute of Biochemistry and Biophysics Polish Academy of SciencesPawińskiego 5a02-106WarsawPoland
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Kotuniak R, Strampraad MJF, Bossak‐Ahmad K, Wawrzyniak UE, Ufnalska I, Hagedoorn P, Bal W. Key Intermediate Species Reveal the Copper(II)‐Exchange Pathway in Biorelevant ATCUN/NTS Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004264] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Radosław Kotuniak
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Marc J. F. Strampraad
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Karolina Bossak‐Ahmad
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
| | - Urszula E. Wawrzyniak
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Ufnalska
- Chair of Medical Biotechnology Faculty of Chemistry Warsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Peter‐Leon Hagedoorn
- Department of Biotechnology Delft University of Technology Van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Wojciech Bal
- Department of Biophysics Institute of Biochemistry and Biophysics Polish Academy of Sciences Pawińskiego 5a 02-106 Warsaw Poland
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Huo G, Chen W, Wang J, Chu X, Xu W, Li B, Zhang Y, Xu B, Zhou X. His18 promotes reactive oxidative stress production in copper-ion mediated human islet amyloid polypeptide aggregation. RSC Adv 2020; 10:5566-5571. [PMID: 35497413 PMCID: PMC9049296 DOI: 10.1039/c9ra09943c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 01/23/2020] [Indexed: 01/20/2023] Open
Abstract
Copper ions play a critical role in human islet amyloid polypeptide (hIAPP) aggregation, which has been found in more than 90% of patients with type-2 diabetes (T2D). The role of Cu(ii) in the cell cytotoxicity with hIAPP has been explored in two aspects: inhibiting the formation of fibrillar structures and stimulating the generation of reactive oxygen species (ROS). In this work, we carried out spectroscopic studies of Cu(ii) interacting with several hIAPP fragments and their variants as well. Electron paramagnetic resonance (EPR) measurements and Amplex Red analysis showed that the amount of H2O2 generated in hIAPP(11-28) solution co-incubated with Cu(ii) was remarkably more than hIAPP(1-11) and hIAPP(28-37). Furthermore, the H2O2 level was seriously reduced when His18 of hIAPP(11-28) was replaced by Arg(R) or Ser(S), indicating that His18 is the key residue of Cu(ii) binding to hIAPP(11-28) to promote H2O2 generation. This is likely because the donation of electrons from the peptide to Cu(ii) ions would result in the formation of the redox-active complexes, which could stimulate the formation of H2O2. Overall, this study provides further insight into the molecular mechanism of Cu(ii) induced ROS generation. His18 promotes H2O2 production in copper-ion mediated hIAPP aggregation.![]()
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Affiliation(s)
- Gengyang Huo
- School of Physics Science and Technology
- Ningbo University
- China
| | - Wenyong Chen
- School of Physics Science and Technology
- Ningbo University
- China
| | - Jianhua Wang
- School of Physics Science and Technology
- Ningbo University
- China
| | - Xinxing Chu
- School of Physics Science and Technology
- Ningbo University
- China
- Shanghai Advanced Research Institute
- Chinese Academy of Sciences
| | - Wei Xu
- School of Physics Science and Technology
- Ningbo University
- China
| | - Bin Li
- Shanghai Advanced Research Institute
- Chinese Academy of Sciences
- China
| | - Yi Zhang
- Shanghai Advanced Research Institute
- Chinese Academy of Sciences
- China
| | - Binqian Xu
- Single Molecule Study Laboratory
- College of Engineering
- University of Georgia
- Athens
- USA
| | - Xingfei Zhou
- School of Physics Science and Technology
- Ningbo University
- China
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18
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Kepp KP, Squitti R. Copper imbalance in Alzheimer’s disease: Convergence of the chemistry and the clinic. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.06.018] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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Stefaniak E, Płonka D, Drew SC, Bossak-Ahmad K, Haas KL, Pushie MJ, Faller P, Wezynfeld NE, Bal W. The N-terminal 14-mer model peptide of human Ctr1 can collect Cu(ii) from albumin. Implications for copper uptake by Ctr1. Metallomics 2019; 10:1723-1727. [PMID: 30489586 DOI: 10.1039/c8mt00274f] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Human cells acquire copper primarily via the copper transporter 1 protein, hCtr1. We demonstrate that at extracellular pH 7.4 CuII is bound to the model peptide hCtr11-14via an ATCUN motif and such complexes are strong enough to collect CuII from albumin, supporting the potential physiological role of CuII binding to hCtr1.
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Affiliation(s)
- Ewelina Stefaniak
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawińskiego 5a, 02-106 Warsaw, Poland.
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Stefaniak E, Bal W. Cu II Binding Properties of N-Truncated Aβ Peptides: In Search of Biological Function. Inorg Chem 2019; 58:13561-13577. [PMID: 31304745 DOI: 10.1021/acs.inorgchem.9b01399] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
As life expectancy increases, the number of people affected by progressive and irreversible dementia, Alzheimer's Disease (AD), is predicted to grow. No drug designs seem to be working in humans, apparently because the origins of AD have not been identified. Invoking amyloid cascade, metal ions, and ROS production hypothesis of AD, herein we share our point of view on Cu(II) binding properties of Aβ4-x, the most prevalent N-truncated Aβ peptide, currently known as the main constituent of amyloid plaques. The capability of Aβ4-x to rapidly take over copper from previously tested Aβ1-x peptides and form highly stable complexes, redox unreactive and resistant to copper exchange reactions, prompted us to propose physiological roles for these peptides. We discuss the new findings on the reactivity of Cu(II)Aβ4-x with coexisting biomolecules in the context of synaptic cleft; we suggest that the role of Aβ4-x peptides is to quench Cu(II) toxicity in the brain and maintain neurotransmission.
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Affiliation(s)
- Ewelina Stefaniak
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences , Pawińskiego 5a , 02-106 Warsaw , Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences , Pawińskiego 5a , 02-106 Warsaw , Poland
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21
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Tabbì G, Magrì A, Rizzarelli E. The copper(II) binding centres of carbonic anhydrase are differently affected by reductants that ensure the redox intracellular environment. J Inorg Biochem 2019; 199:110759. [PMID: 31299377 DOI: 10.1016/j.jinorgbio.2019.110759] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/18/2019] [Accepted: 07/01/2019] [Indexed: 01/25/2023]
Abstract
Copper is involved in several biological processes. The static and labile copper pools are controlled by means of a network of influx and efflux transporters, storage proteins, chaperones, transcription factors and small molecules as glutathione (GSH), which contributes to the cell reducing environment. To follow the fate of intracellular copper labile pool, a variant of human apocarbonic anhydrase has been proposed as fluorescent probe to monitor cytoplasmic Cu2+. Aware that in this cellular compartment copper ion is present as Cu+, electron spin resonance technique (ESR) was used to ascertain whether (bovine or human) carbonic anhydrase (CA) was able to accommodate Cu+ in the same sites occupied by Cu2+, in the presence of naturally occurring reducing agents such as ascorbate and GSH. Our ESR results on Cu2+ complexes with CA allow for a complete characterization of the two metal binding sites of the protein in solution. The use of the reported affinity constants of zinc in the catalytic site and of Cu2+ in the peripheral and catalytic site, allow us to obtain the speciation of copper species mimicking the spectroscopic study conditions. The different Cu2+ coordination features in the catalytic and the peripheral (the N-terminus cleft mouth) binding sites influence the chemical reduction effect of the two main naturally occurring reductants. Ascorbate reversibly reduces the Cu2+ complex with CA, while glutathione irreversibly induces the formation of Cu2+ complex with its oxidized form (GSSG). Our results questioned the use of CA as intracellular Cu2+ sensor. Furthermore, translating these findings to intracellular environment, the conversion of GSH in GSSG can significantly alter the metallostasis.
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Affiliation(s)
- Giovanni Tabbì
- Institute of Crystallography, National Council of Research, CNR, S.S. Catania, via P. Gaifami 18, Catania, Italy
| | - Antonio Magrì
- Institute of Crystallography, National Council of Research, CNR, S.S. Catania, via P. Gaifami 18, Catania, Italy
| | - Enrico Rizzarelli
- Institute of Crystallography, National Council of Research, CNR, S.S. Catania, via P. Gaifami 18, Catania, Italy; Department of Chemical Sciences, University of Catania, Viale A. Doria 6, Catania, Italy; Consorzio Interuniversitario per la Ricerca dei Metalli nei Sistemi Biologici, Via Ulpiani 27, Bari, Italy.
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Stellato F, Chiaraluce R, Consalvi V, De Santis E, La Penna G, Proux O, Rossi G, Morante S. Dealing with Cu reduction in X-ray absorption spectroscopy experiments. Metallomics 2019; 11:1401-1410. [DOI: 10.1039/c9mt00110g] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We prove in the exemplary case of the Cu(ii) amyloid-β peptide complex that, at cryogenic temperatures, the time needed for collecting a good quality spectrum is significantly shorter than the time after which structural damage becomes appreciable.
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Affiliation(s)
| | - Roberta Chiaraluce
- Dipartimento di Scienze Biochimiche “A. Rossi Fanelli” Sapienza Universitá di Roma
- 00185 Roma
- Italy
| | - Valerio Consalvi
- Dipartimento di Scienze Biochimiche “A. Rossi Fanelli” Sapienza Universitá di Roma
- 00185 Roma
- Italy
| | | | - Giovanni La Penna
- INFN
- Sezione di Roma Tor Vergata
- 00133 Roma
- Italy
- CNR – Institute for Chemistry of Organometallic Compounds
| | - Olivier Proux
- Observatoire des Sciences de l'Univers de Grenoble
- 38400 Saint Martin d'Hères (Grenoble)
- France
| | - Giancarlo Rossi
- Dipartimento di Fisica
- Universitá di Roma Tor Vergata
- 00133 Roma
- Italy
- INFN
| | - Silvia Morante
- Dipartimento di Fisica
- Universitá di Roma Tor Vergata
- 00133 Roma
- Italy
- INFN
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Bossak-Ahmad K, Mital M, Płonka D, Drew SC, Bal W. Oligopeptides Generated by Neprilysin Degradation of β-Amyloid Have the Highest Cu(II) Affinity in the Whole Aβ Family. Inorg Chem 2018; 58:932-943. [PMID: 30582328 DOI: 10.1021/acs.inorgchem.8b03051] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The catabolism of β-amyloid (Aβ) is carried out by numerous endopeptidases including neprilysin, which hydrolyzes peptide bonds preceding positions 4, 10, and 12 to yield Aβ4-9 and a minor Aβ12- x species. Alternative processing of the amyloid precursor protein by β-secretase also generates the Aβ11- x species. All these peptides contain a Xxx-Yyy-His sequence, also known as an ATCUN or NTS motif, making them strong chelators of Cu(II) ions. We synthesized the corresponding peptides, Phe-Arg-His-Asp-Ser-Gly-OH (Aβ4-9), Glu-Val-His-His-Gln-Lys-am (Aβ11-16), Val-His-His-Gln-Lys-am (Aβ12-16), and pGlu-Val-His-His-Gln-Lys-am (pAβ11-16), and investigated their Cu(II) binding properties using potentiometry, and UV-vis, circular dichroism, and electron paramagnetic resonance spectroscopies. We found that the three peptides with unmodified N-termini formed square-planar Cu(II) complexes at pH 7.4 with analogous geometries but significantly varied Kd values of 6.6 fM (Aβ4-9), 9.5 fM (Aβ12-16), and 1.8 pM (Aβ11-16). Cyclization of the N-terminal Glu11 residue to the pyroglutamate species pAβ11-16 dramatically reduced the affinity (5.8 nM). The Cu(II) affinities of Aβ4-9 and Aβ12-16 are the highest among the Cu(II) complexes of Aβ peptides. Using fluorescence spectroscopy, we demonstrated that the Cu(II) exchange between the Phe-Arg-His and Val-His-His motifs is very slow, on the order of days. These results are discussed in terms of the relevance of Aβ4-9, a major Cu(II) binding Aβ fragment generated by neprilysin, as a possible Cu(II) carrier in the brain.
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Affiliation(s)
- Karolina Bossak-Ahmad
- Institute of Biochemistry and Biophysics , Polish Academy of Sciences , 02-106 Warsaw , Poland
| | - Mariusz Mital
- Institute of Biochemistry and Biophysics , Polish Academy of Sciences , 02-106 Warsaw , Poland
| | - Dawid Płonka
- Institute of Biochemistry and Biophysics , Polish Academy of Sciences , 02-106 Warsaw , Poland
| | - Simon C Drew
- Institute of Biochemistry and Biophysics , Polish Academy of Sciences , 02-106 Warsaw , Poland
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics , Polish Academy of Sciences , 02-106 Warsaw , Poland
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