1
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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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Falcone E, Hureau C. Redox processes in Cu-binding proteins: the "in-between" states in intrinsically disordered peptides. Chem Soc Rev 2023; 52:6595-6600. [PMID: 37701947 PMCID: PMC10544051 DOI: 10.1039/d3cs00443k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2023] [Indexed: 09/14/2023]
Abstract
We report on a concept that some of us first described a decade ago for pure electron transfer [V. Balland, C. Hureau and J.-M. Savéant, Proc. Natl. Acad. Sci. U. S. A., 2010, 107, 17113]. In the present viewpoint, based on more recent results, we refine and extend this "in-between state" concept to explain the formation of reactive oxygen species by copper ions bound to the amyloid-β (Aβ) peptide involved in Alzheimer's disease. In such intrinsically disordered peptides, the Cu coordination is versatile due to the lack of stable folding and the presence of multiple possible binding anchors. Hence, the Cu(I) and Cu(II) ions do impose their favoured sites, with Cu(I) bound in a linear fashion between two His residues and Cu(II) in a square-based pyramid bound to Asp1 amine and carbonyl groups and two His residues in the equatorial plane. Hence a direct electron transfer is prevented and alternatively an in-between state (IBS) mechanism applies, whose description and analysis with respect to other electron transfer processes is the topic of the present viewpoint.
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Affiliation(s)
- Enrico Falcone
- Institut de Chimie (UMR 7177), Université de Strasbourg, CNRS, Strasbourg, France
- School of Chemistry, University of Nottingham, Nottingham, UK
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3
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Moyano P, Sola E, Naval MV, Guerra-Menéndez L, Fernández MDLC, del Pino J. Neurodegenerative Proteinopathies Induced by Environmental Pollutants: Heat Shock Proteins and Proteasome as Promising Therapeutic Tools. Pharmaceutics 2023; 15:2048. [PMID: 37631262 PMCID: PMC10458078 DOI: 10.3390/pharmaceutics15082048] [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: 06/29/2023] [Revised: 07/19/2023] [Accepted: 07/25/2023] [Indexed: 08/27/2023] Open
Abstract
Environmental pollutants' (EPs) amount and diversity have increased in recent years due to anthropogenic activity. Several neurodegenerative diseases (NDs) are theorized to be related to EPs, as their incidence has increased in a similar way to human EPs exposure and they reproduce the main ND hallmarks. EPs induce several neurotoxic effects, including accumulation and gradual deposition of misfolded toxic proteins, producing neuronal malfunction and cell death. Cells possess different mechanisms to eliminate these toxic proteins, including heat shock proteins (HSPs) and the proteasome system. The accumulation and deleterious effects of toxic proteins are induced through HSPs and disruption of proteasome proteins' homeostatic function by exposure to EPs. A therapeutic approach has been proposed to reduce accumulation of toxic proteins through treatment with recombinant HSPs/proteasome or the use of compounds that increase their expression or activity. Our aim is to review the current literature on NDs related to EP exposure and their relationship with the disruption of the proteasome system and HSPs, as well as to discuss the toxic effects of dysfunction of HSPs and proteasome and the contradictory effects described in the literature. Lastly, we cover the therapeutic use of developed drugs and recombinant proteasome/HSPs to eliminate toxic proteins and prevent/treat EP-induced neurodegeneration.
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Affiliation(s)
- Paula Moyano
- Department of Pharmacology and Toxicology, Veterinary School, Complutense University of Madrid, 28040 Madrid, Spain;
| | - Emma Sola
- Department of Pharmacology and Toxicology, Veterinary School, Complutense University of Madrid, 28040 Madrid, Spain;
| | - María Victoria Naval
- Department of Pharmacology, Pharmacognosy and Bothanic, Pharmacy School, Complutense University of Madrid, 28041 Madrid, Spain
| | - Lucia Guerra-Menéndez
- Department of Physiology, Medicine School, San Pablo CEU University, 28003 Madrid, Spain
| | - Maria De la Cabeza Fernández
- Department of Chemistry and Pharmaceutical Sciences, Pharmacy School, Complutense University of Madrid, 28041 Madrid, Spain
| | - Javier del Pino
- Department of Pharmacology and Toxicology, Veterinary School, Complutense University of Madrid, 28040 Madrid, Spain;
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4
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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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5
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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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6
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Bacchella C, Dell'Acqua S, Nicolis S, Monzani E, Casella L. The reactivity of copper complexes with neuronal peptides promoted by catecholamines and its impact on neurodegeneration. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2022.214756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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7
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Arrigoni F, Di Carlo C, Rovetta A, De Gioia L, Zampella G, Bertini L. Superoxide reduction by Cu‐Amyloid Beta peptide complexes. A Density Functional Theory study. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Federica Arrigoni
- Università degli Studi di Milano-Bicocca: Universita degli Studi di Milano-Bicocca Biotecnology and Biosciences ITALY
| | - Chiara Di Carlo
- Università degli Studi di Milano-Bicocca: Universita degli Studi di Milano-Bicocca Biotecnology and Biosciences ITALY
| | - Alberto Rovetta
- University of Milano–Bicocca University Library: Universita degli Studi di Milano-Bicocca Biotecnology and Biosciences ITALY
| | - Luca De Gioia
- University of Milan–Bicocca: Universita degli Studi di Milano-Bicocca Biotecnology and Biosciences ITALY
| | - Giuseppe Zampella
- University of Milan–Bicocca: Universita degli Studi di Milano-Bicocca Biotecnology and Biosciences ITALY
| | - Luca Bertini
- Universita' degli studi di MIlano-Bicocca Biotecnologie e Bioscienze Piazza della Scienza 2 20127 Milano ITALY
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8
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Arrigoni F, Rovaletti A, Bertini L, Breglia R, De Gioia L, Greco C, Vertemara J, Zampella G, Fantucci P. Investigations of the electronic-molecular structure of bio-inorganic systems using modern methods of quantum chemistry. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2021.120728] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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9
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Kalita S, Kalita S, Kawa AH, Shill S, Gupta A, Kumar S, Mandal B. Copper Chelating Cyclic Peptidomimetic Inhibits Aβ Fibrillogenesis. RSC Med Chem 2022; 13:761-774. [PMID: 35814930 PMCID: PMC9215124 DOI: 10.1039/d2md00019a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Accepted: 05/09/2022] [Indexed: 11/21/2022] Open
Abstract
Misfolding of amyloid- peptide (A) and its subsequent aggregation into toxic oligomers is one of the leading causes of Alzheimer's disease (AD). As a therapeutic approach, cyclic peptides have been...
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10
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Gupta MK, Jena CK, Balachandra C, Sharma NK. Unusual Pseudopeptides: Syntheses and Structural Analyses of Ethylenediprolyl Peptides and Their Metal Complexes with Cu(II) Ion. J Org Chem 2021; 86:16327-16336. [PMID: 34783560 DOI: 10.1021/acs.joc.1c01676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthetic unnatural amino acids and their peptides as peptidomimetics have shown remarkable structural and functional properties. In the repertoire of synthetic peptides, pseudopeptides have emerged as attractive small peptidomimetics that are capable of forming the characteristic secondary structures in the solid/solution phase, as in natural peptides. This report describes the synthesis and structural analyses of novel pseudopeptides as ethylenediprolyl (etpro) tetra/hexapeptides, comprising a chiral diaminedicarboxylate scaffold. Their NMR and CD spectral analyses strongly support the formation of the β-turn-type structures in organic solvents (ACN/MeOH). Further, the single-crystal X-ray studies of tetrapseudopeptide confirm the formation of a unique self-assembly structure as β-strand type in the solid state through hydrogen bonding. Importantly, their diamine moiety influences the formation of Cu-complexes with Cu(II) ions. A tetrapseudopeptide monocarboxylate-Cu(II) complex forms the single crystal that is studied by the single-crystal X-ray diffractometer. The crystal structure of the tetrapseudopeptide-Cu(II) complex confirms the formation of the distorted square planar geometry structure, almost like the amyloid β(Aβ)-peptide-Cu(II) complex structural geometry. Hence, these etpro-pseudopeptides are emerging peptidomimatics that form β-turn types of structures and metal complexes mainly with Cu(II) ions. These molecules could be considered for the development of peptide-based catalysts and peptide-based therapeutic drug candidates.
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Affiliation(s)
- Manish K Gupta
- National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni Campus, Bhubaneswar 752050, India.,Homi Bhabha National Institute (HBNI), Mumbai 400094, India
| | - Chinmay K Jena
- National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni Campus, Bhubaneswar 752050, India.,Homi Bhabha National Institute (HBNI), Mumbai 400094, India
| | - Chenikkayala Balachandra
- National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni Campus, Bhubaneswar 752050, India.,Homi Bhabha National Institute (HBNI), Mumbai 400094, India
| | - Nagendra K Sharma
- National Institute of Science Education and Research (NISER)-Bhubaneswar, Jatni Campus, Bhubaneswar 752050, India.,Homi Bhabha National Institute (HBNI), Mumbai 400094, India
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11
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Iglesias‐Juez A, Chiarello GL, Patience GS, Guerrero‐Pérez MO. Experimental methods in chemical engineering:
X
‐ray absorption spectroscopy—
XAS
,
XANES
,
EXAFS. CAN J CHEM ENG 2021. [DOI: 10.1002/cjce.24291] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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12
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La Mendola D, Arena G, Pietropaolo A, Satriano C, Rizzarelli E. Metal ion coordination in peptide fragments of neurotrophins: A crucial step for understanding the role and signaling of these proteins in the brain. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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13
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Bacchella C, Dell'Acqua S, Nicolis S, Monzani E, Casella L. A Cu-bis(imidazole) Substrate Intermediate Is the Catalytically Competent Center for Catechol Oxidase Activity of Copper Amyloid-β. Inorg Chem 2021; 60:606-613. [PMID: 33405903 PMCID: PMC8023651 DOI: 10.1021/acs.inorgchem.0c02243] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
![]()
Interaction
of copper ions with Aβ peptides alters the redox
activity of the metal ion and can be associated with neurodegeneration.
Many studies deal with the characterization of the copper binding
mode responsible for the reactivity. Oxidation experiments of dopamine
and related catechols by copper(II) complexes with the N-terminal
amyloid-β peptides Aβ16 and Aβ9, and the Aβ16[H6A] and Aβ16[H13A]
mutant forms, both in their free amine and N-acetylated forms show
that efficient reactivity requires the oxygenation of a CuI-bis(imidazole) complex with a bound substrate. Therefore, the active
intermediate for catechol oxidation differs from the proposed “in-between
state” for the catalytic oxidation of ascorbate. During the
catechol oxidation process, hydrogen peroxide and superoxide anion
are formed but give only a minor contribution to the reaction. The redox cycling of copper bound to
amyloid-β peptide
requires the generation of a Cu(I)-Aβ-catecholate complex. When
copper(II) is confined in the N-terminal portion, its reduction is
slow and causes a shift toward a bis-His coordination environment.
The addition of catechol to the Cu(I)-bis(imidazole) complex results
in a faster reaction with dioxygen. The reactive species for catechol
oxidation does not correspond to the proposed “in-between state”
for ascorbate oxidation.
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Affiliation(s)
- Chiara Bacchella
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, Pavia 27100, Italy
| | - Simone Dell'Acqua
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, Pavia 27100, Italy
| | - Stefania Nicolis
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, Pavia 27100, Italy
| | - Enrico Monzani
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, Pavia 27100, Italy
| | - Luigi Casella
- Dipartimento di Chimica, Università di Pavia, Via Taramelli 12, Pavia 27100, Italy
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14
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Lakey-Beitia J, Burillo AM, Penna GL, Hegde ML, Rao K. Polyphenols as Potential Metal Chelation Compounds Against Alzheimer's Disease. J Alzheimers Dis 2021; 82:S335-S357. [PMID: 32568200 PMCID: PMC7809605 DOI: 10.3233/jad-200185] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Alzheimer's disease (AD) is the most common neurodegenerative disease affecting more than 50 million people worldwide. The pathology of this multifactorial disease is primarily characterized by the formation of amyloid-β (Aβ) aggregates; however, other etiological factors including metal dyshomeostasis, specifically copper (Cu), zinc (Zn), and iron (Fe), play critical role in disease progression. Because these transition metal ions are important for cellular function, their imbalance can cause oxidative stress that leads to cellular death and eventual cognitive decay. Importantly, these transition metal ions can interact with the amyloid-β protein precursor (AβPP) and Aβ42 peptide, affecting Aβ aggregation and increasing its neurotoxicity. Considering how metal dyshomeostasis may substantially contribute to AD, this review discusses polyphenols and the underlying chemical principles that may enable them to act as natural chelators. Furthermore, polyphenols have various therapeutic effects, including antioxidant activity, metal chelation, mitochondrial function, and anti-amyloidogenic activity. These combined therapeutic effects of polyphenols make them strong candidates for a moderate chelation-based therapy for AD.
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Affiliation(s)
- Johant Lakey-Beitia
- Centre for Biodiversity and Drug Discovery, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Clayton, City of Knowledge, Panama
| | - Andrea M. Burillo
- Centre for Biodiversity and Drug Discovery, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Clayton, City of Knowledge, Panama
| | - Giovanni La Penna
- National Research Council, Institute of Chemistry of Organometallic Compounds, Sesto Fiorentino (FI), Italy
| | - Muralidhar L. Hegde
- Department of Radiation Oncology, Houston Methodist Research Institute, Houston, TX, USA
- Department of Neurosurgery, Center for Neuroregeneration, Houston Methodist Research Institute, Houston, TX, USA
- Weill Medical College of Cornell University, New York, NY, USA
| | - K.S. Rao
- Centre for Neuroscience, Instituto de Investigaciones Científicas y Servicios de Alta Tecnología (INDICASAT AIP), Clayton, City of Knowledge, Panama
- Zhongke Jianlan Medical Institute, Hangzhou, Republic of China
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15
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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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16
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Mital M, Szutkowski K, Bossak-Ahmad K, Skrobecki P, Drew SC, Poznański J, Zhukov I, Frączyk T, Bal W. The Palladium(II) Complex of A β4-16 as Suitable Model for Structural Studies of Biorelevant Copper(II) Complexes of N-Truncated Beta-Amyloids. Int J Mol Sci 2020; 21:E9200. [PMID: 33276669 PMCID: PMC7731285 DOI: 10.3390/ijms21239200] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Revised: 11/26/2020] [Accepted: 11/30/2020] [Indexed: 11/16/2022] Open
Abstract
The Aβ4-42 peptide is a major beta-amyloid species in the human brain, forming toxic aggregates related to Alzheimer's Disease. It also strongly chelates Cu(II) at the N-terminal Phe-Arg-His ATCUN motif, as demonstrated in Aβ4-16 and Aβ4-9 model peptides. The resulting complex resists ROS generation and exchange processes and may help protect synapses from copper-related oxidative damage. Structural characterization of Cu(II)Aβ4-x complexes by NMR would help elucidate their biological function, but is precluded by Cu(II) paramagneticism. Instead we used an isostructural diamagnetic Pd(II)-Aβ4-16 complex as a model. To avoid a kinetic trapping of Pd(II) in an inappropriate transient structure, we designed an appropriate pH-dependent synthetic procedure for ATCUN Pd(II)Aβ4-16, controlled by CD, fluorescence and ESI-MS. Its assignments and structure at pH 6.5 were obtained by TOCSY, NOESY, ROESY, 1H-13C HSQC and 1H-15N HSQC NMR experiments, for natural abundance 13C and 15N isotopes, aided by corresponding experiments for Pd(II)-Phe-Arg-His. The square-planar Pd(II)-ATCUN coordination was confirmed, with the rest of the peptide mostly unstructured. The diffusion rates of Aβ4-16, Pd(II)-Aβ4-16 and their mixture determined using PGSE-NMR experiment suggested that the Pd(II) complex forms a supramolecular assembly with the apopeptide. These results confirm that Pd(II) substitution enables NMR studies of structural aspects of Cu(II)-Aβ complexes.
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Affiliation(s)
- Mariusz Mital
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
| | - Kosma Szutkowski
- NanoBioMedical Centre, Adam Mickiewicz University, 61-614 Poznań, Poland;
| | - Karolina Bossak-Ahmad
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
| | - Piotr Skrobecki
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
| | - Simon C. Drew
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
| | - Jarosław Poznański
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
| | - Igor Zhukov
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
| | - Tomasz Frączyk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
| | - Wojciech Bal
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106 Warszawa, Poland; (M.M.); (K.B.-A.); (P.S.); (S.C.D.); (J.P.)
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17
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Talukdar R. Rapid access to 3-acyl indoles using ethyl acetate/triflic acid couple as the acylium donor and Cu(OAc) 2 catalysed aerial oxidation of indole benzoins. Org Biomol Chem 2020; 18:8876-8880. [PMID: 33103169 DOI: 10.1039/d0ob01977a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Esters are potential acyl donors but are relatively unexplored for that purpose. A facile installation of acyl groups at the C-3 position of indoles under triflic acid catalysed conditions with easily available and cheap esters as new acylating agents is described herein. Furthermore, heterocycles like N-protected pyrrole, furan and thiophene were also suitable substrates for similar C-2 acylation. Analogous C-3 benzoylated products of indole were obtained, albeit in lower yields, by using methyl benzoate as a benzoyl donor. The benzoylated products were synthesised in much better yields via a copper(ii) catalysed aerial oxidation of indole containing benzoins.
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Affiliation(s)
- Ranadeep Talukdar
- Molecular Synthesis and Drug Discovery Laboratory, Centre of Biomedical Research, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow-226014, India.
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18
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The Role of Exosomal microRNAs and Oxidative Stress in Neurodegenerative Diseases. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:3232869. [PMID: 33193999 PMCID: PMC7641266 DOI: 10.1155/2020/3232869] [Citation(s) in RCA: 71] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 09/28/2020] [Accepted: 10/05/2020] [Indexed: 12/11/2022]
Abstract
Neurodegenerative diseases including Alzheimer's disease and Parkinson's disease are aging-associated diseases with irreversible damage of brain tissue. Oxidative stress is commonly detected in neurodegenerative diseases and related to neuronal injury and pathological progress. Exosome, one of the extracellular vesicles, is demonstrated to carry microRNAs (miRNAs) and build up a cell-cell communication in neurons. Recent research has found that exosomal miRNAs regulate the activity of multiple physiological pathways, including the oxidative stress response, in neurodegenerative diseases. Here, we review the role of exosomal miRNAs and oxidative stress in neurodegenerative diseases. Firstly, we explore the relationship between oxidative stress and neurodegenerative diseases. Secondly, we introduce the characteristics of exosomes and roles of exosome-related miRNAs. Thirdly, we summarized the crosstalk between exosomal miRNAs and oxidative stress in neurodegenerative diseases. Fourthly, we discuss the potential of exosomes to be a biomarker in neurodegenerative diseases. Finally, we summarize the advantages of exosome-based delivery and present situation of research on exosome-based delivery of therapeutic miRNA. Our work is aimed at probing and reinforcing the recognition of the pathomechanism of neurodegenerative diseases and providing the basis for novel strategies of clinical diagnosis and treatment.
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19
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Arrigoni F, Rizza F, Tisi R, De Gioia L, Zampella G, Bertini L. On the propagation of the OH radical produced by Cu-amyloid beta peptide model complexes. Insight from molecular modelling. Metallomics 2020; 12:1765-1780. [PMID: 33052996 DOI: 10.1039/d0mt00113a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Oxidative stress and metal dyshomeostasis are considered as crucial factors in the pathogenesis of Alzheimer's disease (AD). Indeed, transition metal ions such as Cu(ii) can generate Reactive Oxygen Species (ROS) via O2 Fenton-like reduction, catalyzed by Cu(ii) coordinated to the Amyloid beta (Aβ) peptide. Despite intensive effort, the mechanisms of ROS-induced molecular damage remain poorly understood. In the present paper, we investigate on the basis of molecular modelling computations the mechanism of OH radical propagation toward the Aβ peptide, starting from the end-product of OH radical generation by Cu(ii)·Aβ. We evaluate (i) the OH oxidative capacity, as well as the energetics of the possible Aβ oxidation target residues, by quantum chemistry Density Functional Theory (DFT) on coordination models of Cu(ii)/OH/Aβ and (ii) the motion of the OH˙ approaching the Aβ target residues by classical Molecular Dynamics (MD) on the full peptide Cu(ii)/OH/Aβ(1-16). The results show that the oxidative capacity of OH coordinated Cu(ii)Aβ is significantly lower than that of the free OH radical and that propagation toward Aβ Asp and His residues is favoured over Tyr residues. These results are discussed on the basis of the recent literature on in vitro Aβ metal-catalyzed oxidation and on the possible implications for the AD oxidative stress mechanism.
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Affiliation(s)
- Federica Arrigoni
- Department of Biotechnologies and Biosciences, University of Milano-Bicocca, Piazza della Scienza 2, 20126 Milan, Italy.
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20
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Roy R, Pradhan K, Khan J, Das G, Mukherjee N, Das D, Ghosh S. Human Serum Albumin-Inspired Glycopeptide-Based Multifunctional Inhibitor of Amyloid-β Toxicity. ACS OMEGA 2020; 5:18628-18641. [PMID: 32775865 PMCID: PMC7407538 DOI: 10.1021/acsomega.0c01028] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Accepted: 05/19/2020] [Indexed: 05/07/2023]
Abstract
In Alzheimer's disease (AD), insoluble Aβ42 peptide fragments self-aggregate and form oligomers and fibrils in the brain, causing neurotoxicity. Further, the presence of redox-active metal ions such as Cu2+ enhances the aggregation process through chelation with these Aβ42 aggregates as well as generation of Aβ42-mediated reactive oxygen species (ROS). Herein, we have adopted a bioinspired strategy to design and develop a multifunctional glycopeptide hybrid molecule (Glupep), which can serve as a potential AD therapeutic. This molecule consists of a natural metal-chelating tetrapeptide motif of human serum albumin (HSA), a β-sheet breaker peptide, and a sugar moiety for better bioavailability. We performed different biophysical and docking experiments, which revealed that Glupep not only associates with Aβ42 but also prevents its self-aggregation to form toxic oligomers and fibrils. Moreover, Glupep was also shown to sequester out Cu2+ from the Aβ-Cu2+ complex, reducing the ROS formation and toxicity. Besides, this study also revealed that Glupep could protect PC12-derived neurons from Aβ-Cu2+-mediated toxicity by reducing intracellular ROS generation and stabilizing the mitochondrial membrane potential. All these exciting features show Glupep to be a potent inhibitor of Aβ42-mediated multifaceted toxicity and a prospective therapeutic lead for AD.
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Affiliation(s)
- Rajsekhar Roy
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
| | - Krishnangsu Pradhan
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, WB, India
| | - Juhee Khan
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, WB, India
| | - Gaurav Das
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, WB, India
| | - Nabanita Mukherjee
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
| | - Durba Das
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
| | - Surajit Ghosh
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, WB, India
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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21
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Pradhan K, Das G, Kar C, Mukherjee N, Khan J, Mahata T, Barman S, Ghosh S. Rhodamine-Based Metal Chelator: A Potent Inhibitor of Metal-Catalyzed Amyloid Toxicity. ACS OMEGA 2020; 5:18958-18967. [PMID: 32775897 PMCID: PMC7408195 DOI: 10.1021/acsomega.0c02235] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 06/19/2020] [Indexed: 05/28/2023]
Abstract
Alzheimer's disease (AD) exhibits a multitude of syndromes which add up to its complex nature. In AD, amyloid plaques are deposited along with abnormal accumulation of transition-metal ions. These transition-metal ions are redox-active and help to induce the formation of various polymorphic forms of amyloid-β. Amyloid oligomeric and fibrillar aggregates are the main cause for neuronal toxicity. Another reason for neuronal toxicity arises from generation of reactive oxygen species (ROS) catalyzed by redox-active metal ions through Fenton's reaction. In this direction, an Aβ inhibitor possessing the metal chelation property will be the most promising approach against multifaceted AD. Herein, a rhodamine-B-based compound (Rh-BT) has been designed and synthesized. Rhodamine was attached with benzothiazole as a recognition unit for amyloid-β aggregates. The molecule can effectively capture redox metal ions from the Aβ-Cu2+ complex as well as inhibit Aβ self-assembly such as toxic oligomeric and fibrillar aggregates. Various biophysical assays show that Rh-BT interacts with the Aβ peptide, is capable of decreasing metal-induced ROS generation, and inhibits Aβ-Cu2+-induced cytotoxicity. All these results support the multifunctional nature of Rh-BT, which has an Aβ-specific recognition unit. In addition to the above properties, Rh-BT also exhibits good serum stability in vivo and blood-brain barrier permeability. Therefore, Rh-BT can be considered as a potent multifunctional therapeutic for the treatment of AD.
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Affiliation(s)
- Krishnangsu Pradhan
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Gaurav Das
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Chirantan Kar
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Nabanita Mukherjee
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
| | - Juhee Khan
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Tanushree Mahata
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Surajit Barman
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
| | - Surajit Ghosh
- Organic
and Medicinal Chemistry and Structural Biology and Bioinformatics
Division, CSIR-Indian Institute of Chemical
Biology, 4, Raja S. C. Mullick Road, Jadavpur, Kolkata 700 032, West Bengal, India
- Department
of Bioscience & Bioengineering, Indian
Institute of Technology Jodhpur, NH 65, Surpura Bypass Road, Karwar, Rajasthan 342037, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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22
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Mechanistic approaches for chemically modifying the coordination sphere of copper-amyloid-β complexes. Proc Natl Acad Sci U S A 2020; 117:5160-5167. [PMID: 32102914 DOI: 10.1073/pnas.1916944117] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Neurotoxic implications of the interactions between Cu(I/II) and amyloid-β (Aβ) indicate a connection between amyloid cascade hypothesis and metal ion hypothesis with respect to the neurodegeneration associated with Alzheimer's disease (AD). Herein, we report a mechanistic strategy for modifying the first coordination sphere of Cu(II) bound to Aβ utilizing a rationally designed peptide modifier, L1. Upon reacting with L1, a metal-binding histidine (His) residue, His14, in Cu(II)-Aβ was modified through either covalent adduct formation, oxidation, or both. Consequently, the reactivity of L1 with Cu(II)-Aβ was able to disrupt binding of Cu(II) to Aβ and result in chemically modified Aβ with altered aggregation and toxicity profiles. Our molecular-level mechanistic studies revealed that such L1-mediated modifications toward Cu(II)-Aβ could stem from the molecule's ability to 1) interact with Cu(II)-Aβ and 2) foster copper-O2 chemistry. Collectively, our work demonstrates the development of an effective approach to modify Cu(II)-Aβ at a metal-binding amino acid residue and consequently alter Aβ's coordination to copper, aggregation, and toxicity, supplemented with an in-depth mechanistic perspective regarding such reactivity.
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23
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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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24
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De Gregorio G, Biasotto F, Hecel A, Luczkowski M, Kozlowski H, Valensin D. Structural analysis of copper(I) interaction with amyloid β peptide. J Inorg Biochem 2019; 195:31-38. [DOI: 10.1016/j.jinorgbio.2019.03.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 03/04/2019] [Accepted: 03/05/2019] [Indexed: 12/01/2022]
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25
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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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26
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La Penna G, Li MS. Computational models explain how copper binding to amyloid-β peptide oligomers enhances oxidative pathways. Phys Chem Chem Phys 2019; 21:8774-8784. [DOI: 10.1039/c9cp00293f] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Amyloid-β (Aβ) peptides are intrinsically disordered peptides and their aggregation is the major hallmark of Alzheimer's disease (AD) development.
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Affiliation(s)
- Giovanni La Penna
- National Research Council of Italy (CNR)
- Institute for Chemistry of Organometallic Compounds (ICCOM)
- via Madonna del Piano 10
- 50019 Sesto Fiorentino
- Firenze
| | - Mai Suan Li
- Institute of Physics
- Polish Academy of Sciences
- Al. Lotnikow 32/46
- 02-668 Warsaw
- Poland
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