1
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Manning MC, Holcomb RE, Payne RW, Stillahn JM, Connolly BD, Katayama DS, Liu H, Matsuura JE, Murphy BM, Henry CS, Crommelin DJA. Stability of Protein Pharmaceuticals: Recent Advances. Pharm Res 2024; 41:1301-1367. [PMID: 38937372 DOI: 10.1007/s11095-024-03726-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2024] [Accepted: 06/03/2024] [Indexed: 06/29/2024]
Abstract
There have been significant advances in the formulation and stabilization of proteins in the liquid state over the past years since our previous review. Our mechanistic understanding of protein-excipient interactions has increased, allowing one to develop formulations in a more rational fashion. The field has moved towards more complex and challenging formulations, such as high concentration formulations to allow for subcutaneous administration and co-formulation. While much of the published work has focused on mAbs, the principles appear to apply to any therapeutic protein, although mAbs clearly have some distinctive features. In this review, we first discuss chemical degradation reactions. This is followed by a section on physical instability issues. Then, more specific topics are addressed: instability induced by interactions with interfaces, predictive methods for physical stability and interplay between chemical and physical instability. The final parts are devoted to discussions how all the above impacts (co-)formulation strategies, in particular for high protein concentration solutions.'
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Affiliation(s)
- Mark Cornell Manning
- Legacy BioDesign LLC, Johnstown, CO, USA.
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA.
| | - Ryan E Holcomb
- Legacy BioDesign LLC, Johnstown, CO, USA
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA
| | - Robert W Payne
- Legacy BioDesign LLC, Johnstown, CO, USA
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA
| | - Joshua M Stillahn
- Legacy BioDesign LLC, Johnstown, CO, USA
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA
| | | | | | | | | | | | - Charles S Henry
- Department of Chemistry, Colorado State University, Fort Collins, CO, USA
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2
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An D, Xu Y. Environmental risk factors provoke new thinking for prevention and treatment of dementia with Lewy bodies. Heliyon 2024; 10:e30175. [PMID: 38707435 PMCID: PMC11068646 DOI: 10.1016/j.heliyon.2024.e30175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 04/09/2024] [Accepted: 04/22/2024] [Indexed: 05/07/2024] Open
Abstract
In recent years, environmental factors have received attention in the pathogenesis of neurodegenerative diseases. Other than genetic factors, the identification of environmental factors and modifiable risk factors may create opportunities to delay the onset or slow the progression of Lewy body disease. Researchers have made significant progress in understanding environmental and modifiable risk factors over the past 30 years. To date, despite the increasing number of articles assessing risk factors for Lewy body disease, few reviews have focused on their role in its onset. In this review, we reviewed the literature investigating the relationship between Lewy body disease and several environmental and other modifiable factors. We found that some air pollutants, exposure to some metals, and infection with some microorganisms may increase the risk of Lewy body disease. Coffee intake and the Mediterranean diet are protective factors. However, it is puzzling that low educational levels and smoking may have some protective effects. In addition, we proposed specific protocols for subsequent research directions on risk factors for neurodegenerative diseases and improved methods. By conducting additional case-control studies, we could explore the role of these factors in the etiopathogenesis of Lewy body disease, establishing a foundation for strategies aimed at preventing and reducing the onset and burden of the disease.
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Affiliation(s)
- Dinghao An
- Department of Neurology, Nanjing Drum Tower Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Nanjing, China
- Department of Neurology, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China
| | - Yun Xu
- Department of Neurology, Nanjing Drum Tower Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Nanjing, China
- Department of Neurology, Nanjing Drum Tower Hospital, Affiliated Hospital of Medical School, Nanjing University, Nanjing, China
- State Key Laboratory of Pharmaceutical Biotechnology and Institute of Translational Medicine for Brain Critical Diseases, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory for Molecular Medicine, Medical School of Nanjing University, Nanjing, China
- Nanjing Neurology Clinical Medical Center, Nanjing, China
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3
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Sulatsky MI, Stepanenko OV, Stepanenko OV, Povarova OI, Kuznetsova IM, Turoverov KK, Sulatskaya AI. Broken but not beaten: Challenge of reducing the amyloids pathogenicity by degradation. J Adv Res 2024:S2090-1232(24)00161-9. [PMID: 38642804 DOI: 10.1016/j.jare.2024.04.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2024] [Revised: 04/17/2024] [Accepted: 04/17/2024] [Indexed: 04/22/2024] Open
Abstract
BACKGROUND The accumulation of ordered protein aggregates, amyloid fibrils, accompanies various neurodegenerative diseases (such as Parkinson's, Huntington's, Alzheimer's, etc.) and causes a wide range of systemic and local amyloidoses (such as insulin, hemodialysis amyloidosis, etc.). Such pathologies are usually diagnosed when the disease is already irreversible and a large amount of amyloid plaques have accumulated. In recent years, new drugs aimed at reducing amyloid levels have been actively developed. However, although clinical trials have demonstrated a reduction in amyloid plaque size with these drugs, their effect on disease progression has been controversial and associated with significant side effects, the reasons of which are not fully understood. AIM OF REVIEW The purpose of this review is to summarize extensive array of data on the effect of exogenous and endogenous factors (physico-mechanical effects, chemical effects of low molecular weight compounds, macromolecules and their complexes) on the structure and pathogenicity of mature amyloids for proposing future directions of the development of effective and safe anti-amyloid therapeutics. KEY SCIENTIFIC CONCEPTS OF REVIEW Our analysis show that destruction of amyloids is in most cases incomplete and degradation products often retain the properties of amyloids (including high and sometimes higher than fibrils, cytotoxicity), accelerate amyloidogenesis and promote the propagation of amyloids between cells. Probably, the appearance of protein aggregates, polymorphic in structure and properties (such as amorphous aggregates, fibril fragments, amyloid oligomers, etc.), formed because of uncontrolled degradation of amyloids, may be one of the reasons for the ambiguous effectiveness and serious side effects of the anti-amyloid drugs. This means that all medications that are supposed to be used both for degradation and slow down the fibrillogenesis must first be tested on mature fibrils: the mechanism of drug action and cytotoxic, seeding, and infectious activity of the degradation products must be analyzed.
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Affiliation(s)
- Maksim I Sulatsky
- Laboratory of Cell Morphology, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 St. Petersburg, Russia
| | - Olga V Stepanenko
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 St. Petersburg, Russia
| | - Olesya V Stepanenko
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 St. Petersburg, Russia
| | - Olga I Povarova
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 St. Petersburg, Russia
| | - Irina M Kuznetsova
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 St. Petersburg, Russia
| | - Konstantin K Turoverov
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 St. Petersburg, Russia
| | - Anna I Sulatskaya
- Laboratory of Structural Dynamics, Stability and Folding of Proteins, Institute of Cytology of the Russian Academy of Sciences, 4 Tikhoretsky ave., 194064 St. Petersburg, Russia.
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4
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Sari L, Bali S, Joachimiak LA, Lin MM. Hairpin trimer transition state of amyloid fibril. Nat Commun 2024; 15:2756. [PMID: 38553453 PMCID: PMC10980705 DOI: 10.1038/s41467-024-46446-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 02/28/2024] [Indexed: 04/02/2024] Open
Abstract
Protein fibril self-assembly is a universal transition implicated in neurodegenerative diseases. Although fibril structure/growth are well characterized, fibril nucleation is poorly understood. Here, we use a computational-experimental approach to resolve fibril nucleation. We show that monomer hairpin content quantified from molecular dynamics simulations is predictive of experimental fibril formation kinetics across a tau motif mutant library. Hairpin trimers are predicted to be fibril transition states; one hairpin spontaneously converts into the cross-beta conformation, templating subsequent fibril growth. We designed a disulfide-linked dimer mimicking the transition state that catalyzes fibril formation, measured by ThT fluorescence and TEM, of wild-type motif - which does not normally fibrillize. A dimer compatible with extended conformations but not the transition-state fails to nucleate fibril at any concentration. Tau repeat domain simulations show how long-range interactions sequester this motif in a mutation-dependent manner. This work implies that different fibril morphologies could arise from disease-dependent hairpin seeding from different loci.
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Affiliation(s)
- Levent Sari
- Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA
- Lyda Hill Department of Bioinformatics, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Sofia Bali
- Molecular Biophysics Graduate Program, University of Texas Southwestern Medical Center, Dallas, TX, USA
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Lukasz A Joachimiak
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA
- Department of Biochemistry, University of Texas Southwestern Medical Center, Dallas, TX, USA
| | - Milo M Lin
- Green Center for Systems Biology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
- Lyda Hill Department of Bioinformatics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
- Center for Alzheimer's and Neurodegenerative Diseases, Peter O'Donnell Jr. Brain Institute, University of Texas Southwestern Medical Center, Dallas, TX, USA.
- Department of Biophysics, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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5
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Galkin M, Priss A, Kyriukha Y, Shvadchak V. Navigating α-Synuclein Aggregation Inhibition: Methods, Mechanisms, and Molecular Targets. CHEM REC 2024; 24:e202300282. [PMID: 37919046 DOI: 10.1002/tcr.202300282] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 10/08/2023] [Indexed: 11/04/2023]
Abstract
Parkinson's disease is a yet incurable, age-related neurodegenerative disorder characterized by the aggregation of small neuronal protein α-synuclein into amyloid fibrils. Inhibition of this process is a prospective strategy for developing a disease-modifying treatment. We overview here small molecule, peptide, and protein inhibitors of α-synuclein fibrillization reported to date. Special attention was paid to the specificity of inhibitors and critical analysis of their action mechanisms. Namely, the importance of oxidation of polyphenols and cross-linking of α-synuclein into inhibitory dimers was highlighted. We also compared strategies of targeting monomeric, oligomeric, and fibrillar α-synuclein species, thoroughly discussed the strong and weak sides of different approaches to testing the inhibitors.
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Affiliation(s)
- Maksym Galkin
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Anastasiia Priss
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Yevhenii Kyriukha
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Saint Louis, Missouri, 63110, United States
| | - Volodymyr Shvadchak
- Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
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6
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Heid LF, Kupreichyk T, Schützmann MP, Schneider W, Stoldt M, Hoyer W. Nucleation of α-Synuclein Amyloid Fibrils Induced by Cross-Interaction with β-Hairpin Peptides Derived from Immunoglobulin Light Chains. Int J Mol Sci 2023; 24:16132. [PMID: 38003322 PMCID: PMC10671648 DOI: 10.3390/ijms242216132] [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: 09/15/2023] [Revised: 10/30/2023] [Accepted: 11/07/2023] [Indexed: 11/26/2023] Open
Abstract
Heterologous interactions between different amyloid-forming proteins, also called cross-interactions, may have a critical impact on disease-related amyloid formation. β-hairpin conformers of amyloid-forming proteins have been shown to affect homologous interactions in the amyloid self-assembly process. Here, we applied two β-hairpin-forming peptides derived from immunoglobulin light chains as models to test how heterologous β-hairpins modulate the fibril formation of Parkinson's disease-associated protein α-synuclein (αSyn). The peptides SMAhp and LENhp comprise β-strands C and C' of the κ4 antibodies SMA and LEN, which are associated with light chain amyloidosis and multiple myeloma, respectively. SMAhp and LENhp bind with high affinity to the β-hairpin-binding protein β-wrapin AS10 according to isothermal titration calorimetry and NMR spectroscopy. The addition of SMAhp and LENhp affects the kinetics of αSyn aggregation monitored by Thioflavin T (ThT) fluorescence, with the effect depending on assay conditions, salt concentration, and the applied β-hairpin peptide. In the absence of agitation, substoichiometric concentrations of the hairpin peptides strongly reduce the lag time of αSyn aggregation, suggesting that they support the nucleation of αSyn amyloid fibrils. The effect is also observed for the aggregation of αSyn fragments lacking the N-terminus or the C-terminus, indicating that the promotion of nucleation involves the interaction of hairpin peptides with the hydrophobic non-amyloid-β component (NAC) region.
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Affiliation(s)
- Laetitia F. Heid
- Institut für Physikalische Biologie, Heinrich Heine University Düsseldorf, 40204 Düsseldorf, Germany
| | - Tatsiana Kupreichyk
- Institut für Physikalische Biologie, Heinrich Heine University Düsseldorf, 40204 Düsseldorf, Germany
- Institute of Biological Information Processing (IBI-7) and JuStruct, Jülich Center for Structural Biology, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Marie P. Schützmann
- Institut für Physikalische Biologie, Heinrich Heine University Düsseldorf, 40204 Düsseldorf, Germany
| | - Walfried Schneider
- Institut für Physikalische Biologie, Heinrich Heine University Düsseldorf, 40204 Düsseldorf, Germany
| | - Matthias Stoldt
- Institute of Biological Information Processing (IBI-7) and JuStruct, Jülich Center for Structural Biology, Forschungszentrum Jülich, 52425 Jülich, Germany
| | - Wolfgang Hoyer
- Institut für Physikalische Biologie, Heinrich Heine University Düsseldorf, 40204 Düsseldorf, Germany
- Institute of Biological Information Processing (IBI-7) and JuStruct, Jülich Center for Structural Biology, Forschungszentrum Jülich, 52425 Jülich, Germany
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7
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Pancoe SX, Wang YJ, Shimogawa M, Perez RM, Giannakoulias S, Petersson EJ. Effects of Mutations and Post-Translational Modifications on α-Synuclein In Vitro Aggregation. J Mol Biol 2022; 434:167859. [PMID: 36270580 PMCID: PMC9922159 DOI: 10.1016/j.jmb.2022.167859] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 10/10/2022] [Accepted: 10/11/2022] [Indexed: 11/06/2022]
Abstract
Fibrillar aggregates of the α-synuclein (αS) protein are the hallmark of Parkinson's Disease and related neurodegenerative disorders. Characterization of the effects of mutations and post-translational modifications (PTMs) on the αS aggregation rate can provide insight into the mechanism of fibril formation, which remains elusive in spite of intense study. A comprehensive collection (375 examples) of mutant and PTM aggregation rate data measured using the fluorescent probe thioflavin T is presented, as well as a summary of the effects of fluorescent labeling on αS aggregation (20 examples). A curated set of 131 single mutant de novo aggregation experiments are normalized to wild type controls and analyzed in terms of structural data for the monomer and fibrillar forms of αS. These tabulated data serve as a resource to the community to help in interpretation of aggregation experiments and to potentially be used as inputs for computational models of aggregation.
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Affiliation(s)
- Samantha X Pancoe
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Yanxin J Wang
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Marie Shimogawa
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Ryann M Perez
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - Sam Giannakoulias
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA
| | - E James Petersson
- Department of Chemistry, University of Pennsylvania, 231 South 34th Street, Philadelphia, PA 19104, USA.
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8
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Jayan J, Roshi H, Ashraf FFP, Nair PG, Vijayakumar A, Nair AS, Pappachen LK, Abdelgawad MA, Parambi DGT, Aleya L, Mathew B. Effects of radiation exposure on brain health: a state of the art and new challenges. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:87068-87081. [PMID: 36308656 DOI: 10.1007/s11356-022-23703-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2021] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Good brain health refers to a condition in which a person may fully realize their talents and improve their psychological, emotional, cognitive, and behavioral functioning to cope with life's challenges. Various causes of CNS diseases are now being investigated. Radiation is one of the factors that affects the brain and causes a variety of problems. The emission or transmission of energy in the form of waves or particles via space or a material medium is known as radiation. Particle beams and electromagnetic waves are two types of ionizing radiation that have the potential to ionize atoms in a material (separating them into positively charged ions and negatively charged electrons). Radiation to the CNS can induce delayed puberty, which can lead to hyperprolactinemia, and the hypothalamic-pituitary axis can lead to gonadotropin deficit if the hypothalamic-pituitary axis is involved in the radiation field. Ionizing radiation is the most common kind of radiation. Here, we focus on the different effects of radiation on brain health. In this article, we will look at a variety of CNS diseases and how radiation affects each one, as well as how it affects the brain's numerous processes.
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Affiliation(s)
- Jayalakshmi Jayan
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India
| | - Harsha Roshi
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India
| | - Fathima Farzana Perumbilly Ashraf
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India
| | - Parvathy G Nair
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India
| | - Aparna Vijayakumar
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India
| | - Aathira Sujathan Nair
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India
| | - Leena K Pappachen
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India.
| | - Mohamed A Abdelgawad
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jouf University, Sakaka, 2014, Al Jouf, Saudi Arabia
| | - Della Grace Thomas Parambi
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jouf University, Sakaka, 2014, Al Jouf, Saudi Arabia
| | - Lotfi Aleya
- Laboratoire Chrono-Environment, Universite de Bourgogne Franche-Comte, CNRS6249, Besancon, France
| | - Bijo Mathew
- Department of Pharmaceutical Chemistry, Amrita School of Pharmacy, AIMS Health Sciences Campus, Amrita Vishwa Vidyapeetham, Kochi, 682 041, India.
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9
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Docherty J, Leheste JR, Mancini J, Yao S. Preliminary Effects of Osteopathic Manipulative Medicine on Reactive Oxygen Species in Parkinson’s Disease: A Randomized Controlled Pilot Study. Cureus 2022; 14:e31504. [DOI: 10.7759/cureus.31504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/13/2022] [Indexed: 11/16/2022] Open
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10
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Buell AK. Stability matters, too - the thermodynamics of amyloid fibril formation. Chem Sci 2022; 13:10177-10192. [PMID: 36277637 PMCID: PMC9473512 DOI: 10.1039/d1sc06782f] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2021] [Accepted: 01/30/2022] [Indexed: 12/26/2022] Open
Abstract
Amyloid fibrils are supramolecular homopolymers of proteins that play important roles in biological functions and disease. These objects have received an exponential increase in attention during the last few decades, due to their role in the aetiology of a range of severe disorders, most notably some of a neurodegenerative nature. While an overwhelming number of experimental studies exist that investigate how, and how fast, amyloid fibrils form and how their formation can be inhibited, a much more limited body of experimental work attempts to answer the question as to why these types of structures form (i.e. the thermodynamic driving force) and how stable they actually are. In this review, I attempt to give an overview of the types of experiments that have been performed to-date to answer these questions, and to summarise our current understanding of amyloid thermodynamics.
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Affiliation(s)
- Alexander K Buell
- Technical University of Denmark, Department of Biotechnology and Biomedicine Søltofts Plads, Building 227 2800 Kgs. Lyngby Denmark
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11
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Sahin C, Østerlund EC, Österlund N, Costeira-Paulo J, Pedersen JN, Christiansen G, Nielsen J, Grønnemose AL, Amstrup SK, Tiwari MK, Rao RSP, Bjerrum MJ, Ilag LL, Davies MJ, Marklund EG, Pedersen JS, Landreh M, Møller IM, Jørgensen TJD, Otzen DE. Structural Basis for Dityrosine-Mediated Inhibition of α-Synuclein Fibrillization. J Am Chem Soc 2022; 144:11949-11954. [PMID: 35749730 PMCID: PMC9284551 DOI: 10.1021/jacs.2c03607] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
α-Synuclein
(α-Syn) is an intrinsically disordered
protein which self-assembles into highly organized β-sheet structures
that accumulate in plaques in brains of Parkinson’s disease
patients. Oxidative stress influences α-Syn structure and self-assembly;
however, the basis for this remains unclear. Here we characterize
the chemical and physical effects of mild oxidation on monomeric α-Syn
and its aggregation. Using a combination of biophysical methods, small-angle
X-ray scattering, and native ion mobility mass spectrometry, we find
that oxidation leads to formation of intramolecular dityrosine cross-linkages
and a compaction of the α-Syn monomer by a factor of √2.
Oxidation-induced compaction is shown to inhibit ordered self-assembly
and amyloid formation by steric hindrance, suggesting an important
role of mild oxidation in preventing amyloid formation.
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Affiliation(s)
- Cagla Sahin
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.,Department of Molecular Biology and Genetics, Aarhus University, Universitetsbyen 81, DK-8000 Aarhus C, Denmark
| | - Eva Christina Østerlund
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Nicklas Österlund
- Department of Biochemistry and Biophysics, Stockholm University, SE-114 18 Stockholm, Sweden
| | - Joana Costeira-Paulo
- Department of Chemistry - BMC, BMC - Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| | - Jannik Nedergaard Pedersen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Gunna Christiansen
- Department of Health Science and Technology, Medical Microbiology and Immunology, Aalborg University, Fredrik Bajers Vej 3b, DK-9220 Aalborg Ø, Denmark
| | - Janni Nielsen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Anne Louise Grønnemose
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.,Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Søren Kirk Amstrup
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.,Department of Molecular Biology and Genetics, Aarhus University, Universitetsbyen 81, DK-8000 Aarhus C, Denmark
| | - Manish K Tiwari
- Department Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - R Shyama Prasad Rao
- Biostatistics and Bioinformatics Division, Yenepoya Research Center, Yenepoya University, Mangaluru-575018, Karnataka, India
| | - Morten Jannik Bjerrum
- Department Chemistry, University of Copenhagen, Universitetsparken 5, DK-2100 Copenhagen Ø, Denmark
| | - Leopold L Ilag
- Department of Materials and Environmental Chemistry, Stockholm University, SE-114 18 Stockholm, Sweden
| | - Michael J Davies
- Department of Biomedical Sciences, University of Copenhagen, Blegdamsvej 3B, DK-2200 Copenhagen N, Denmark
| | - Erik G Marklund
- Department of Chemistry - BMC, BMC - Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| | - Jan Skov Pedersen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.,Department of Chemistry, Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark
| | - Michael Landreh
- Department of Microbiology, Tumor and Cell Biology, Karolinska Institutet, Solnavägen 9, SE-171 65 Solna, Sweden
| | - Ian Max Møller
- Department of Molecular Biology and Genetics, Aarhus University, Forsøgsvej 1, DK-4200 Slagelse, Denmark
| | - Thomas J D Jørgensen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, Denmark
| | - Daniel Erik Otzen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000 Aarhus C, Denmark.,Department of Molecular Biology and Genetics, Aarhus University, Universitetsbyen 81, DK-8000 Aarhus C, Denmark
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12
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Kumar H, Udgaonkar JB. Elongation of Fibrils Formed by a Tau Fragment is Inhibited by a Transient Dimeric Intermediate. J Phys Chem B 2022; 126:3385-3397. [PMID: 35503811 DOI: 10.1021/acs.jpcb.1c10752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The formation and propagation of aggregates of the tau protein in the brain are associated with the tauopathy group of neurodegenerative diseases. Different tauopathies have been shown to be associated with structurally distinct aggregates of tau. However, the mechanism by which different structural folds arise remains poorly understood. In this study of fibril formation by the fragment tau-K18 of tau, it is shown that the Lys 280 → Glu mutation in the variant tau-K18 K280E forms fibrils that are morphologically distinct from those formed by wild-type (wt) tau-K18. The mutant fibrils appear to have two protofilaments twisted around each other, whereas the wt fibrils are straight and appear to have a single protofilament. Modeling the kinetics of seeded aggregation, using a simple Michaelis-Menten-like mechanism, reveals that the two morphologically distinct fibrils are elongated with different catalytic efficiencies. Surprisingly, when the elongation of monomeric tau-K18 is seeded with tau-K18 K280E fibrils, it is seen to be inhibited at high monomer concentrations. Such inhibition is not seen when elongation is seeded with tau-K18 fibrils. The mechanism of inhibition is shown to be describable as uncompetitive inhibition, in which a transient dimeric form of tau-K18 acts as an uncompetitive inhibitor. Importantly, a dimeric form of tau-K18 is seen to be populated to a detectable extent early during aggregation. A covalently linked tau dimer, with an inter-molecular disulphide linkage, is shown to be capable of acting as an inhibitor. In summary, a quantitative kinetic approach has provided an understanding of how the formation of distinct structural folds of tau fibrils can be modulated by mutation and how the elongation of one fibril type, but not the other, is inhibited by a transiently formed dimer.
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Affiliation(s)
- Harish Kumar
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru 560065, India
| | - Jayant B Udgaonkar
- National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru 560065, India.,Indian Institute of Science Education and Research, Pune 411008, India
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13
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Freibert SA, Boniecki MT, Stümpfig C, Schulz V, Krapoth N, Winge DR, Mühlenhoff U, Stehling O, Cygler M, Lill R. N-terminal tyrosine of ISCU2 triggers [2Fe-2S] cluster synthesis by ISCU2 dimerization. Nat Commun 2021; 12:6902. [PMID: 34824239 PMCID: PMC8617193 DOI: 10.1038/s41467-021-27122-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Accepted: 11/03/2021] [Indexed: 12/03/2022] Open
Abstract
Synthesis of iron-sulfur (Fe/S) clusters in living cells requires scaffold proteins for both facile synthesis and subsequent transfer of clusters to target apoproteins. The human mitochondrial ISCU2 scaffold protein is part of the core ISC (iron-sulfur cluster assembly) complex that synthesizes a bridging [2Fe-2S] cluster on dimeric ISCU2. Initial iron and sulfur loading onto monomeric ISCU2 have been elucidated biochemically, yet subsequent [2Fe-2S] cluster formation and dimerization of ISCU2 is mechanistically ill-defined. Our structural, biochemical and cell biological experiments now identify a crucial function of the universally conserved N-terminal Tyr35 of ISCU2 for these late reactions. Mixing two, per se non-functional ISCU2 mutant proteins with oppositely charged Asp35 and Lys35 residues, both bound to different cysteine desulfurase complexes NFS1-ISD11-ACP, restores wild-type ISCU2 maturation demonstrating that ionic forces can replace native Tyr-Tyr interactions during dimerization-induced [2Fe-2S] cluster formation. Our studies define the essential mechanistic role of Tyr35 in the reaction cycle of de novo mitochondrial [2Fe-2S] cluster synthesis. [2Fe-2S] protein cofactors are essential for life and are synthesized on ISCU2 scaffolds. Here, the authors show that hydrophobic interaction of two conserved N-terminal tyrosines induces ISCU2 dimerization and concomitant [2Fe-2S] cluster synthesis.
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Affiliation(s)
- Sven-A Freibert
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany.,Core Facility 'Protein Biochemistry and Spectroscopy', Karl-von-Frisch-Str. 14, 35032, Marburg, Germany
| | - Michal T Boniecki
- Department of Biochemistry, Microbiology & Immunology, University of Saskatchewan, 107 Wiggins Rd, Saskatoon, SK, S7N 5E5, Canada
| | - Claudia Stümpfig
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany
| | - Vinzent Schulz
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany
| | - Nils Krapoth
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany
| | - Dennis R Winge
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany.,Department of Medicine, University of Utah Health Sciences Center, Salt Lake City, UT, USA
| | - Ulrich Mühlenhoff
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany
| | - Oliver Stehling
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany.,Core Facility 'Protein Biochemistry and Spectroscopy', Karl-von-Frisch-Str. 14, 35032, Marburg, Germany
| | - Miroslaw Cygler
- Department of Biochemistry, Microbiology & Immunology, University of Saskatchewan, 107 Wiggins Rd, Saskatoon, SK, S7N 5E5, Canada.
| | - Roland Lill
- Institut für Zytobiologie im Zentrum SYNMIKRO, Philipps-Universität Marburg, Karl-von-Frisch-Str. 14, 35032, Marburg, Germany. .,Core Facility 'Protein Biochemistry and Spectroscopy', Karl-von-Frisch-Str. 14, 35032, Marburg, Germany. .,LOEWE Zentrum für Synthetische Mikrobiologie SynMikro, Hans-Meerwein-Str., 35043, Marburg, Germany.
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14
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Galkin M, Priss A, Topcheva O, Yushchenko DA, Shvadchak VV. FRET-based assay for intracellular evaluation of α-synuclein aggregation inhibitors. J Neurochem 2021; 159:901-912. [PMID: 34687236 DOI: 10.1111/jnc.15528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 10/07/2021] [Accepted: 10/07/2021] [Indexed: 01/01/2023]
Abstract
Aggregation of small neuronal protein α-synuclein (αSyn) in amyloid fibrils is considered to be one of the main causes of Parkinson's disease. Inhibition of this aggregation is a promising approach for disease treatment. Dozens of compounds able to inhibit αSyn fibrillization in solution were developed during the last decade. However, the applicability of most of them in the cellular environment was not established because of the absence of a suitable cell-based assay. In this work, we developed an assay for testing αSyn aggregation inhibitors in cells that is based on fluorescence resonance energy transfer (FRET) between labeled αSyn molecules in fibrils. The assay directly reports the amount of fibrillized αSyn and is more reliable than the assays based on cell viability. Moreover, we showed that cell viability decline does not always correlate with the amount of misfolded αSyn. The developed FRET-based assay does not interfere with the aggregation process and is suitable for high-throughput testing of αSyn aggregation inhibitors. Its application can sort out non-specific inhibitors and thus significantly facilitate the development of drugs for Parkinson`s disease.
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Affiliation(s)
- Maksym Galkin
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Faculty of Science, Department of Biochemistry, Charles University, Prague, Czech Republic
| | - Anastasiia Priss
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Faculty of Science, Department of Biochemistry, Charles University, Prague, Czech Republic
| | - Oleksandra Topcheva
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Dmytro A Yushchenko
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Miltenyi Biotec GmbH, Bergisch Gladbach, Germany
| | - Volodymyr V Shvadchak
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic.,Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
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15
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Behl T, Kaur G, Sehgal A, Zengin G, Singh S, Ahmadi A, Bungau S. Flavonoids, the Family of Plant-derived Antioxidants making inroads into Novel Therapeutic Design against IR-induced Oxidative Stress in Parkinson's Disease. Curr Neuropharmacol 2021; 20:324-343. [PMID: 34030619 PMCID: PMC9413797 DOI: 10.2174/1570159x19666210524152817] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/17/2021] [Accepted: 05/05/2021] [Indexed: 11/22/2022] Open
Abstract
Background: Ionizing radiation from telluric sources is unceasingly an unprotected pitfall to humans. Thus, the foremost contributors to human exposure are global and medical radiations. Various evidences assembled during preceding years reveal the pertinent role of ionizing radiation-induced oxidative stress in the progression of neurodegenerative insults, such as Parkinson’s disease, which have been contributing to increased proliferation and generation of reactive oxygen species. Objective: This review delineates the role of ionizing radiation-induced oxidative stress in Parkinson’s disease and proposes novel therapeutic interventions of flavonoid family, offering effective management and slowing down the progression of Parkinson’s disease. Methods: Published papers were searched in MEDLINE, PubMed, etc., published to date for in-depth database collection. Results: The oxidative damage may harm the non-targeted cells. It can also modulate the functions of the central nervous system, such as protein misfolding, mitochondria dysfunction, increased levels of oxidized lipids, and dopaminergic cell death, which accelerate the progression of Parkinson’s disease at the molecular, cellular, or tissue levels. In Parkinson’s disease, reactive oxygen species exacerbate the production of nitric oxides and superoxides by activated microglia, rendering death of dopaminergic neuronal cell through different mechanisms. Conclusion: Rising interest has extensively engrossed in the clinical trial designs based on the plant-derived family of antioxidants. They are known to exert multifarious impact on neuroprotection via directly suppressing ionizing radiation-induced oxidative stress and reactive oxygen species production or indirectly increasing the dopamine levels and activating the glial cells.
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Affiliation(s)
- Tapan Behl
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Gagandeep Kaur
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Aayush Sehgal
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Gokhan Zengin
- Department of Biology, Faculty of Science, Selcuk University Campus, Konya, India
| | - Sukhbir Singh
- Chitkara College of Pharmacy, Chitkara University, Punjab, India
| | - Amirhossein Ahmadi
- Pharmaceutical Sciences Research Centre, Faculty of Pharmacy, Mazandaran University of Medical Sciences, Sari. Iran
| | - Simona Bungau
- Department of Pharmacy, Faculty of Medicine and Pharmacy, University of Oradea, Oradea. Romania
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16
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Priss A, Afitska K, Galkin M, Yushchenko DA, Shvadchak VV. Rationally Designed Protein-Based Inhibitor of α-Synuclein Fibrillization in Cells. J Med Chem 2021; 64:6827-6837. [PMID: 33970620 DOI: 10.1021/acs.jmedchem.1c00086] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Misfolding of the neuronal protein α-synuclein (αSyn) into amyloid fibrils is involved in the development of Parkinson's disease (PD), and inhibition of this process is considered to be a promising therapeutic approach. In this work, we engineered protein inhibitors that bind to fibrils with higher affinity than the monomeric αSyn. They were developed based on the recent structural data of the αSyn fibrils and were shown to prevent fibril elongation upon binding to fibril ends. These inhibitors are highly selective to the misfolded αSyn, nontoxic, and active in cytosol in small concentrations. The best-performing inhibitor shows IC50 ∼10 nM in a cell-based assay, which corresponds to the ∼1:60 molar ratio to αSyn. It can suppress the formation of αSyn aggregates in cells that can be potentially used to slow down the spreading of the pathological aggregates from cell to cell during the course of the PD.
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Affiliation(s)
- Anastasiia Priss
- Academy of Sciences of the Czech Republic, Institute of Organic Chemistry and Biochemistry, Flemingovo nam. 2, Prague 16610, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Albertov 6, Prague 12843, Czech Republic
| | - Kseniia Afitska
- Academy of Sciences of the Czech Republic, Institute of Organic Chemistry and Biochemistry, Flemingovo nam. 2, Prague 16610, Czech Republic
| | - Maksym Galkin
- Academy of Sciences of the Czech Republic, Institute of Organic Chemistry and Biochemistry, Flemingovo nam. 2, Prague 16610, Czech Republic.,Department of Biochemistry, Faculty of Science, Charles University, Albertov 6, Prague 12843, Czech Republic
| | - Dmytro A Yushchenko
- Academy of Sciences of the Czech Republic, Institute of Organic Chemistry and Biochemistry, Flemingovo nam. 2, Prague 16610, Czech Republic.,Miltenyi Biotec GmbH, Friedrich-Ebert-Straße 68, Bergisch Gladbach D-51429, Germany
| | - Volodymyr V Shvadchak
- Academy of Sciences of the Czech Republic, Institute of Organic Chemistry and Biochemistry, Flemingovo nam. 2, Prague 16610, Czech Republic
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17
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Megadalton-sized Dityrosine Aggregates of α-Synuclein Retain High Degrees of Structural Disorder and Internal Dynamics. J Mol Biol 2020; 432:166689. [PMID: 33211011 PMCID: PMC7779668 DOI: 10.1016/j.jmb.2020.10.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 10/15/2020] [Accepted: 10/15/2020] [Indexed: 02/06/2023]
Abstract
Despite their large size, αSyn dityrosine aggregates are dynamic and disordered. αSyn dityrosine aggregates specifically form in complex environments. αSyn dityrosine aggregates retain residual membrane binding activity. Dityrosine aggregates inhibit amyloid formation of monomeric αSyn. αSyn dityrosine aggregates are not cytotoxic.
Heterogeneous aggregates of the human protein α-synuclein (αSyn) are abundantly found in Lewy body inclusions of Parkinson’s disease patients. While structural information on classical αSyn amyloid fibrils is available, little is known about the conformational properties of disease-relevant, non-canonical aggregates. Here, we analyze the structural and dynamic properties of megadalton-sized dityrosine adducts of αSyn that form in the presence of reactive oxygen species and cytochrome c, a proapoptotic peroxidase that is released from mitochondria during sustained oxidative stress. In contrast to canonical cross-β amyloids, these aggregates retain high degrees of internal dynamics, which enables their characterization by solution-state NMR spectroscopy. We find that intermolecular dityrosine crosslinks restrict αSyn motions only locally whereas large segments of concatenated molecules remain flexible and disordered. Indistinguishable aggregates form in crowded in vitro solutions and in complex environments of mammalian cell lysates, where relative amounts of free reactive oxygen species, rather than cytochrome c, are rate limiting. We further establish that dityrosine adducts inhibit classical amyloid formation by maintaining αSyn in its monomeric form and that they are non-cytotoxic despite retaining basic membrane-binding properties. Our results suggest that oxidative αSyn aggregation scavenges cytochrome c’s activity into the formation of amorphous, high molecular-weight structures that may contribute to the structural diversity of Lewy body deposits.
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18
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Agerschou ED, Borgmann V, Wördehoff MM, Hoyer W. Inhibitor and substrate cooperate to inhibit amyloid fibril elongation of α-synuclein. Chem Sci 2020; 11:11331-11337. [PMID: 34094375 PMCID: PMC8162328 DOI: 10.1039/d0sc04051g] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2020] [Accepted: 09/28/2020] [Indexed: 11/21/2022] Open
Abstract
In amyloid fibril elongation, soluble growth substrate binds to the fibril-end and converts into the fibril conformation. This process is targeted by inhibitors that block fibril-ends. Here, we investigated how the elongation of α-synuclein (αS) fibrils, which are associated with Parkinson's disease and other synucleinopathies, is inhibited by αS variants with a preformed hairpin in the critical N-terminal region comprising residues 36-57. The inhibitory efficiency is strongly dependent on the specific position of the hairpin. We find that the inhibitor and substrate concentration dependencies can be analyzed with models of competitive enzyme inhibition. Remarkably, the growth substrate, i.e., wild-type αS, supports inhibition by stabilizing the elongation-incompetent blocked state. This observation allowed us to create inhibitor-substrate fusions that achieved inhibition at low nanomolar concentration. We conclude that inhibitor-substrate cooperativity can be exploited for the design of fibril growth inhibitors.
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Affiliation(s)
- Emil Dandanell Agerschou
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Germany
| | - Vera Borgmann
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Germany
| | - Michael M Wördehoff
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Germany
| | - Wolfgang Hoyer
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf 40225 Düsseldorf Germany
- Institute of Biological Information Processing, Structural Biochemistry (IBI-7), JuStruct: Jülich Center for Structural Biology, Forschungszentrum Jülich 52425 Jülich Germany
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19
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Clustering of human prion protein and α-synuclein oligomers requires the prion protein N-terminus. Commun Biol 2020; 3:365. [PMID: 32647130 PMCID: PMC7347944 DOI: 10.1038/s42003-020-1085-z] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Accepted: 06/18/2020] [Indexed: 12/31/2022] Open
Abstract
The interaction of prion protein (PrP) and α-synuclein (αSyn) oligomers causes synaptic impairment that might trigger Parkinson’s disease and other synucleinopathies. Here, we report that αSyn oligomers (αSynO) cluster with human PrP (huPrP) into micron-sized condensates. Multivalency of αSyn within oligomers is required for condensation, since clustering with huPrP is not observed for monomeric αSyn. The stoichiometry of the heteroassemblies is well defined with an αSyn:huPrP molar ratio of about 1:1. The αSynO−huPrP interaction is of high affinity, signified by slow dissociation. The huPrP region responsible for condensation of αSynO, residues 95−111 in the intrinsically disordered N-terminus, corresponds to the region required for αSynO-mediated cognitive impairment. HuPrP, moreover, achieves co-clustering of αSynO and Alzheimer’s disease-associated amyloid-β oligomers, providing a case of a cross-interaction of two amyloidogenic proteins through an interlinking intrinsically disordered protein region. The results suggest that αSynO-mediated condensation of huPrP is involved in the pathogenesis of synucleinopathies. Nadine S. Rösener et al. show that α-synuclein oligomers can cluster with human prion protein (huPrP) into condensates. The intrinsically disordered N-terminus of huPrP is necessary for this high-affinity interaction, suggesting a link between cluster formation and toxicity.
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20
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Doherty CPA, Ulamec SM, Maya-Martinez R, Good SC, Makepeace J, Khan GN, van Oosten-Hawle P, Radford SE, Brockwell DJ. A short motif in the N-terminal region of α-synuclein is critical for both aggregation and function. Nat Struct Mol Biol 2020; 27:249-259. [PMID: 32157247 PMCID: PMC7100612 DOI: 10.1038/s41594-020-0384-x] [Citation(s) in RCA: 105] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Accepted: 01/22/2020] [Indexed: 02/04/2023]
Abstract
Aggregation of human α-synuclein (αSyn) is linked to Parkinson’s disease (PD) pathology. The central region of the αSyn sequence contains the non-amyloid β-component (NAC) crucial for aggregation. However, how NAC flanking regions modulate αSyn aggregation remains unclear. Using bioinformatics, mutation, and NMR we identify a 7-residue sequence, named P1 (residues 36-42), that controls αSyn aggregation. Deletion or substitution of this ‘master-controller’ prevents aggregation at pH 7.5 in vitro. At lower pH, P1 synergises with a sequence containing the PreNAC region (P2, residues 45-57) to prevent aggregation. Deleting P1 (ΔP1) or both P1 and P2 (ΔΔ) also prevents age-dependent αSyn aggregation and toxicity in C. elegans models and prevents αSyn-mediated vesicle fusion by altering the conformational properties of the protein when lipid-bound. The results highlight the importance of a master-controller sequence motif that controls both αSyn aggregation and function- a region that could be targeted to prevent aggregation in disease.
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Affiliation(s)
- Ciaran P A Doherty
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Sabine M Ulamec
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Roberto Maya-Martinez
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Sarah C Good
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Jemma Makepeace
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - G Nasir Khan
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Patricija van Oosten-Hawle
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom
| | - Sheena E Radford
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom.
| | - David J Brockwell
- Astbury Centre for Structural Molecular Biology, School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, LS2 9JT, United Kingdom.
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21
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Afitska K, Priss A, Yushchenko DA, Shvadchak VV. Structural Optimization of Inhibitors of α-Synuclein Fibril Growth: Affinity to the Fibril End as a Crucial Factor. J Mol Biol 2020; 432:967-977. [DOI: 10.1016/j.jmb.2019.11.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 11/16/2019] [Accepted: 11/18/2019] [Indexed: 01/23/2023]
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22
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Killinger BA, Melki R, Brundin P, Kordower JH. Endogenous alpha-synuclein monomers, oligomers and resulting pathology: let's talk about the lipids in the room. NPJ PARKINSONS DISEASE 2019; 5:23. [PMID: 31728405 PMCID: PMC6851126 DOI: 10.1038/s41531-019-0095-3] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2019] [Accepted: 10/09/2019] [Indexed: 12/11/2022]
Abstract
Alpha-synuclein is an intrinsically disordered, highly dynamic protein that pathogenically aggregates into inclusion structures called Lewy bodies, in several neurogenerative diseases termed synucleinopathies. Despite its importance for understanding disease, the oligomerization status of alpha-synuclein in healthy cells remains unclear. Alpha-synuclein may exist predominantly as either a monomer or a variety of oligomers of different molecular weights. There is solid evidence to support both theories. Detection of apparent endogenous oligomers are intimately dependent on vesicle and lipid interactions. Here we consider the possibility that apparent endogenous alpha-synuclein oligomers are in fact conformations of membrane-bound alpha-synuclein and not a bona fide stable soluble species. This perspective posits that the formation of any alpha-synuclein oligomers within the cell is likely toxic and interconversion between monomer and oligomer is tightly controlled. This differs from the hypothesis that there is a continuum of endogenous non-toxic oligomers and they convert, through unclear mechanisms, to toxic oligomers. The distinction is important, because it clarifies the biological origin of synucleinopathy. We suggest that a monomer-only, lipid-centric view of endogenous alpha-synuclein aggregation can explain how alpha-synuclein pathology is triggered, and that the interactions between alpha-synuclein and lipids can represent a target for therapeutic intervention. This discussion is well-timed due to recent studies that show lipids are a significant component of Lewy pathology.
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Affiliation(s)
- Bryan A Killinger
- 1Department of Neurological Sciences, Rush University Medical Center, Chicago, IL 60612 USA
| | - Ronald Melki
- 2CEA and Laboratory of Neurodegenerative Diseases, Institut Francois Jacob (MIRCen), CNRS, 92265 Fontenay-Aux-Roses cedex, France
| | - Patrik Brundin
- 3Center for Neurodegenerative Science, Van Andel Research Institute, Grand Rapids, MI 49503 USA
| | - Jeffrey H Kordower
- 1Department of Neurological Sciences, Rush University Medical Center, Chicago, IL 60612 USA
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23
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Fricano A, Librizzi F, Rao E, Alfano C, Vetri V. Blue autofluorescence in protein aggregates “lighted on” by UV induced oxidation. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:140258. [DOI: 10.1016/j.bbapap.2019.07.011] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 07/18/2019] [Accepted: 07/26/2019] [Indexed: 11/27/2022]
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24
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Kyriukha YA, Afitska K, Kurochka AS, Sachan S, Galkin M, Yushchenko DA, Shvadchak VV. α-Synuclein Dimers as Potent Inhibitors of Fibrillization. J Med Chem 2019; 62:10342-10351. [DOI: 10.1021/acs.jmedchem.9b01400] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Yevhenii A. Kyriukha
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
| | - Kseniia Afitska
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
- Department of Biochemistry, Faculty of Science, Charles University, Albertov 6, 12843 Prague, Czech Republic
| | - Andrii S. Kurochka
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
| | - Shubhra Sachan
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
| | - Maksym Galkin
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
- Department of Biochemistry, Faculty of Science, Charles University, Albertov 6, 12843 Prague, Czech Republic
| | - Dmytro A. Yushchenko
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
- Group of Bioconjugation Chemistry, Miltenyi Biotec GmbH, Friedrich-Ebert-Straße 68, D-51429 Bergisch Gladbach, Germany
| | - Volodymyr V. Shvadchak
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Flemingovo nam. 2, 16610 Prague 6, Czech Republic
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25
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de Oliveira GAP, Silva JL. Alpha-synuclein stepwise aggregation reveals features of an early onset mutation in Parkinson's disease. Commun Biol 2019; 2:374. [PMID: 31633065 PMCID: PMC6789109 DOI: 10.1038/s42003-019-0598-9] [Citation(s) in RCA: 75] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Accepted: 09/04/2019] [Indexed: 02/08/2023] Open
Abstract
Amyloid formation is a process involving interconverting protein species and results in toxic oligomers and fibrils. Aggregated alpha-synuclein (αS) participates in neurodegenerative maladies, but a closer understanding of the early αS polymerization stages and polymorphism of heritable αS variants is sparse still. Here, we distinguished αS oligomer and protofibril interconversions in Thioflavin T polymerization reactions. The results support a hypothesis reconciling the nucleation-polymerization and nucleation-conversion-polymerization models to explain the dissimilar behaviors of wild-type and the A53T mutant. Cryo-electron microscopy with a direct detector shows the polymorphic nature of αS fibrils formed by heritable A30P, E46K, and A53T point mutations. By showing that A53T rapidly nucleates competent species, continuously elongates fibrils in the presence of increasing amounts of seeds, and overcomes wild-type surface requirements for growth, our findings place A53T with features that may explain the early onset of familial Parkinson's disease cases bearing this mutation.
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Affiliation(s)
- Guilherme A. P. de Oliveira
- Institute of Medical Biochemistry Leopoldo de Meis, National Institute of Science and Technology for Structural Biology and Bioimaging, National Center of Nuclear Magnetic Resonance Jiri Jonas, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-901 Brazil
- Department of Biochemistry and Molecular Genetics, University of Virginia, Charlottesville, VA 22904 USA
| | - Jerson L. Silva
- Institute of Medical Biochemistry Leopoldo de Meis, National Institute of Science and Technology for Structural Biology and Bioimaging, National Center of Nuclear Magnetic Resonance Jiri Jonas, Federal University of Rio de Janeiro, Rio de Janeiro, RJ 21941-901 Brazil
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26
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Falke M, Victor J, Wördehoff MM, Peduzzo A, Zhang T, Schröder GF, Buell AK, Hoyer W, Etzkorn M. α-Synuclein-derived lipoparticles in the study of α-Synuclein amyloid fibril formation. Chem Phys Lipids 2019; 220:57-65. [PMID: 30826264 PMCID: PMC6451039 DOI: 10.1016/j.chemphyslip.2019.02.009] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 02/21/2019] [Accepted: 02/22/2019] [Indexed: 12/23/2022]
Abstract
Aggregation of the protein α-Synuclein (αSyn) is of great interest due to its involvement in the pathology of Parkinson’s disease. However, under in vitro conditions αSyn is very soluble and kinetically stable for extended time periods. As a result, most αSyn aggregation assays rely on conditions that artificially induce or enhance aggregation, often by introducing rather non-native conditions. It has been shown that αSyn interacts with membranes and conditions have been identified in which membranes can promote as well as inhibit αSyn aggregation. It has also been shown that αSyn has the intrinsic capability to assemble lipid-protein-particles, in a similar way as apolipoproteins can form lipid-bilayer nanodiscs. Here we show that these αSyn-lipid particles (αSyn-LiPs) can also effectively induce, accelerate or inhibit αSyn aggregation, depending on the applied conditions. αSyn-LiPs therefore provide a general platform and additional tool, complementary to other setups, to study various aspects of αSyn amyloid fibril formation.
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Affiliation(s)
- Marcel Falke
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany
| | - Julian Victor
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany
| | - Michael M Wördehoff
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany
| | - Alessia Peduzzo
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany
| | - Tao Zhang
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany
| | - Gunnar F Schröder
- Institute of Complex Systems (ICS-6), Forschungszentrum Jülich, Germany
| | - Alexander K Buell
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany
| | - Wolfgang Hoyer
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany
| | - Manuel Etzkorn
- Institut für Physikalische Biologie, Heinrich-Heine-University Düsseldorf, Germany; Institute of Complex Systems (ICS-6), Forschungszentrum Jülich, Germany.
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27
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Amundarain MJ, Herrera MG, Zamarreño F, Viso JF, Costabel MD, Dodero VI. Molecular mechanisms of 33-mer gliadin peptide oligomerisation. Phys Chem Chem Phys 2019; 21:22539-22552. [DOI: 10.1039/c9cp02338k] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
The 33-mer gliadin peptide oligomerizes driven by its non-ionic polar character, flexible PPII secondary structure and stable glutamine H-bonds.
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Affiliation(s)
- María Julia Amundarain
- Grupo de Biofísica
- Instituto de Física del Sur
- Universidad Nacional del Sur
- Bahía Blanca
- Argentina
| | | | - Fernando Zamarreño
- Grupo de Biofísica
- Instituto de Física del Sur
- Universidad Nacional del Sur
- Bahía Blanca
- Argentina
| | - Juan Francisco Viso
- Grupo de Biofísica
- Instituto de Física del Sur
- Universidad Nacional del Sur
- Bahía Blanca
- Argentina
| | - Marcelo D. Costabel
- Grupo de Biofísica
- Instituto de Física del Sur
- Universidad Nacional del Sur
- Bahía Blanca
- Argentina
| | - Verónica I. Dodero
- Universität Bielefeld
- Fakultät für Chemie
- Organische Chemie
- 33615 Bielefeld
- Germany
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28
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Abeyawardhane DL, Fernández RD, Heitger DR, Crozier MK, Wolver JC, Lucas HR. Copper Induced Radical Dimerization of α-Synuclein Requires Histidine. J Am Chem Soc 2018; 140:17086-17094. [DOI: 10.1021/jacs.8b08947] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
| | - Ricardo D. Fernández
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Denver R. Heitger
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Madeleine K. Crozier
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Julia C. Wolver
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
| | - Heather R. Lucas
- Department of Chemistry, Virginia Commonwealth University, Richmond, Virginia 23284, United States
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29
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Copper Redox Cycling Inhibits Aβ Fibre Formation and Promotes Fibre Fragmentation, while Generating a Dityrosine Aβ Dimer. Sci Rep 2018; 8:16190. [PMID: 30385800 PMCID: PMC6212427 DOI: 10.1038/s41598-018-33935-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Accepted: 10/04/2018] [Indexed: 12/22/2022] Open
Abstract
Oxidative stress and the formation of plaques which contain amyloid-β (Aβ) peptides are two key hallmarks of Alzheimer’s disease (AD). Dityrosine is found in the plaques of AD patients and Aβ dimers have been linked to neurotoxicity. Here we investigate the formation of Aβ dityrosine dimers promoted by Cu2+/+ Fenton reactions. Using fluorescence measurements and UV absorbance, we show that dityrosine can be formed aerobically when Aβ is incubated with Cu2+ and hydrogen-peroxide, or in a Cu2+ and ascorbate redox mixture. The dityrosine cross-linking can occur for both monomeric and fibrillar forms of Aβ. We show that oxidative modification of Aβ impedes the ability for Aβ monomer to form fibres, as indicated by the amyloid specific dye Thioflavin T (ThT). Transmission electron microscopy (TEM) indicates the limited amyloid assemblies that form have a marked reduction in fibre length for Aβ(1–40). Importantly, the addition of Cu2+ and a reductant to preformed Aβ(1–40) fibers causes their widespread fragmentation, reducing median fibre lengths from 800 nm to 150 nm upon oxidation. The processes of covalent cross-linking of Aβ fibres, dimer formation, and fibre fragmentation within plaques are likely to have a significant impact on Aβ clearance and neurotoxicity.
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30
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Díaz-Caballero M, Fernández MR, Navarro S, Ventura S. Prion-based nanomaterials and their emerging applications. Prion 2018; 12:266-272. [PMID: 30196749 PMCID: PMC6277190 DOI: 10.1080/19336896.2018.1521235] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2018] [Revised: 08/22/2018] [Accepted: 08/23/2018] [Indexed: 12/12/2022] Open
Abstract
Protein misfolding and aggregation into highly ordered fibrillar structures have been traditionally associated with pathological processes. Nevertheless, nature has taken advantage of the particular properties of amyloids for functional purposes, like in the protection of organisms against environmental changing conditions. Over the last decades, these fibrillar structures have inspired the design of new nanomaterials with intriguing applications in biomedicine and nanotechnology such as tissue engineering, drug delivery, adhesive materials, biodegradable nanocomposites, nanowires or biosensors. Prion and prion-like proteins, which are considered a subclass of amyloids, are becoming ideal candidates for the design of new and tunable nanomaterials. In this review, we discuss the particular properties of this kind of proteins, and the current advances on the design of new materials based on prion sequences.
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Affiliation(s)
- Marta Díaz-Caballero
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autonoma de Barcelona, Bellaterra (Barcelona), Spain
| | - Maria Rosario Fernández
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autonoma de Barcelona, Bellaterra (Barcelona), Spain
| | - Susanna Navarro
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autonoma de Barcelona, Bellaterra (Barcelona), Spain
| | - Salvador Ventura
- Institut de Biotecnologia i de Biomedicina and Departament de Bioquímica i Biologia Molecular, Universitat Autonoma de Barcelona, Bellaterra (Barcelona), Spain
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31
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Jovcevski B, Andrew Aquilina J, Benesch JLP, Ecroyd H. The influence of the N-terminal region proximal to the core domain on the assembly and chaperone activity of αB-crystallin. Cell Stress Chaperones 2018; 23:827-836. [PMID: 29520626 PMCID: PMC6111084 DOI: 10.1007/s12192-018-0889-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 02/19/2018] [Accepted: 02/24/2018] [Indexed: 01/24/2023] Open
Abstract
αB-Crystallin (HSPB5) is a small heat-shock protein that is composed of dimers that then assemble into a polydisperse ensemble of oligomers. Oligomerisation is mediated by heterologous interactions between the C-terminal tail of one dimer and the core "α-crystallin" domain of another and stabilised by interactions made by the N-terminal region. Comparatively little is known about the latter contribution, but previous studies have suggested that residues in the region 54-60 form contacts that stabilise the assembly. We have generated mutations in this region (P58A, S59A, S59K, R56S/S59R and an inversion of residues 54-60) to examine their impact on oligomerisation and chaperone activity in vitro. By using native mass spectrometry, we found that all the αB-crystallin mutants were assembly competent, populating similar oligomeric distributions to wild-type, ranging from 16-mers to 30-mers. However, circular dichroism spectroscopy, intrinsic tryptophan and bis-ANS fluorescence studies demonstrated that the secondary structure differs to wild type, the 54-60 inversion mutation having the greatest impact. All the mutants exhibited a dramatic decrease in exposed hydrophobicity. We also found that the mutants in general were equally active as the wild-type protein in inhibiting the amorphous aggregation of insulin and seeded amyloid fibrillation of α-synuclein in vitro, except for the 54-60 inversion mutant, which was significantly less effective at inhibiting insulin aggregation. Our data indicate that alterations in the part of the N-terminal region proximal to the core domain do not drastically affect the oligomerisation of αB-crystallin, reinforcing the robustness of αB-crystallin in functioning as a molecular chaperone.
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Affiliation(s)
- Blagojce Jovcevski
- Illawarra Health and Medical Research Institute and School of Biological Sciences, University of Wollongong, Northfields Ave, Wollongong, NSW, 2522, Australia
| | - J Andrew Aquilina
- Illawarra Health and Medical Research Institute and School of Biological Sciences, University of Wollongong, Northfields Ave, Wollongong, NSW, 2522, Australia
| | - Justin L P Benesch
- Department of Chemistry, Physical and Theoretical Chemistry Laboratory, University of Oxford, South Parks Road, Oxford, OX1 3QZ, UK
| | - Heath Ecroyd
- Illawarra Health and Medical Research Institute and School of Biological Sciences, University of Wollongong, Northfields Ave, Wollongong, NSW, 2522, Australia.
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32
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Sharma NK, Sharma R, Mathur D, Sharad S, Minhas G, Bhatia K, Anand A, Ghosh SP. Role of Ionizing Radiation in Neurodegenerative Diseases. Front Aging Neurosci 2018; 10:134. [PMID: 29867445 PMCID: PMC5963202 DOI: 10.3389/fnagi.2018.00134] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Accepted: 04/23/2018] [Indexed: 02/03/2023] Open
Abstract
Ionizing radiation (IR) from terrestrial sources is continually an unprotected peril to human beings. However, the medical radiation and global radiation background are main contributors to human exposure and causes of radiation sickness. At high-dose exposures acute radiation sickness occurs, whereas chronic effects may persist for a number of years. Radiation can increase many circulatory, age related and neurodegenerative diseases. Neurodegenerative diseases occur a long time after exposure to radiation, as demonstrated in atomic bomb survivors, and are still controversial. This review discuss the role of IR in neurodegenerative diseases and proposes an association between neurodegenerative diseases and exposure to IR.
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Affiliation(s)
- Neel K. Sharma
- Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Rupali Sharma
- Center for Neuroscience and Regenerative Medicine, Department of Pathology, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Deepali Mathur
- Neurobiology Laboratory, School of Biotechnology, KIIT University, Bhubaneswar, India
| | - Shashwat Sharad
- Center for Prostate Disease Research, Department of Surgery, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
| | - Gillipsie Minhas
- Neuroscience Research Lab, Department of Neurology, Postgraduate Institute of Medical Education & Research (PGIMER), Chandigarh, India
| | | | - Akshay Anand
- Neuroscience Research Lab, Department of Neurology, Postgraduate Institute of Medical Education & Research (PGIMER), Chandigarh, India
| | - Sanchita P. Ghosh
- Armed Forces Radiobiology Research Institute, Uniformed Services University of the Health Sciences, Bethesda, MD, United States
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33
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Wördehoff MM, Hoyer W. α-Synuclein Aggregation Monitored by Thioflavin T Fluorescence Assay. Bio Protoc 2018; 8:e2941. [PMID: 30069495 DOI: 10.21769/bioprotoc.2941] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Studying the aggregation of amyloid proteins like α-synuclein in vitro is a convenient and popular tool to gain kinetic insights into aggregation as well as to study factors (e.g., aggregation inhibitors) that influence it. These aggregation assays typically make use of the fluorescence dye Thioflavin T as a sensitive fluorescence reporter of amyloid fibril formation and are conducted in a plate-reader-based format, permitting the simultaneous screening of multiple samples and conditions. However, aggregation assays are generally prone to poor reproducibility due to the stochastic nature of fibril nucleation and the multiplicity of modulating factors. Here we present a simple and reproducible protocol to study the aggregation of α-synuclein in a plate-reader based assay.
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Affiliation(s)
- Michael M Wördehoff
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany
| | - Wolfgang Hoyer
- Institut für Physikalische Biologie, Heinrich-Heine-Universität Düsseldorf, 40204 Düsseldorf, Germany.,Institute of Complex Systems (ICS-6), Structural Biochemistry, Research Centre Jülich, 52425 Jülich, Germany
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