1
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Dear AJ, Teng X, Ball SR, Lewin J, Horne RI, Clow D, Stevenson A, Harper N, Yahya K, Yang X, Brewerton SC, Thomson J, Michaels TCT, Linse S, Knowles TPJ, Habchi J, Meisl G. Molecular mechanism of α-synuclein aggregation on lipid membranes revealed. Chem Sci 2024; 15:7229-7242. [PMID: 38756798 PMCID: PMC11095391 DOI: 10.1039/d3sc05661a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Accepted: 03/14/2024] [Indexed: 05/18/2024] Open
Abstract
The central hallmark of Parkinson's disease pathology is the aggregation of the α-synuclein protein, which, in its healthy form, is associated with lipid membranes. Purified monomeric α-synuclein is relatively stable in vitro, but its aggregation can be triggered by the presence of lipid vesicles. Despite this central importance of lipids in the context of α-synuclein aggregation, their detailed mechanistic role in this process has not been established to date. Here, we use chemical kinetics to develop a mechanistic model that is able to globally describe the aggregation behaviour of α-synuclein in the presence of DMPS lipid vesicles, across a range of lipid and protein concentrations. Through the application of our kinetic model to experimental data, we find that the reaction is a co-aggregation process involving both protein and lipids and that lipids promote aggregation as much by enabling fibril elongation as by enabling their initial formation. Moreover, we find that the primary nucleation of lipid-protein co-aggregates takes place not on the surface of lipid vesicles in bulk solution but at the air-water and/or plate interfaces, where lipids and proteins are likely adsorbed. Our model forms the basis for mechanistic insights, also in other lipid-protein co-aggregation systems, which will be crucial in the rational design of drugs that inhibit aggregate formation and act at the key points in the α-synuclein aggregation cascade.
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Affiliation(s)
- Alexander J Dear
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Xiangyu Teng
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Sarah R Ball
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Joshua Lewin
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Robert I Horne
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Daniel Clow
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Alisdair Stevenson
- Department of Biology, Institute of Biochemistry, ETH Zurich Otto Stern Weg 3 8093 Zurich Switzerland
- Bringing Materials to Life Initiative, ETH Zurich Switzerland
| | - Natasha Harper
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Kim Yahya
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Xiaoting Yang
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Suzanne C Brewerton
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - John Thomson
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Thomas C T Michaels
- Department of Biology, Institute of Biochemistry, ETH Zurich Otto Stern Weg 3 8093 Zurich Switzerland
- Bringing Materials to Life Initiative, ETH Zurich Switzerland
| | - Sara Linse
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
- Biochemistry and Structural Biology, Lund University Lund Sweden
| | - Tuomas P J Knowles
- Yusuf Hamied Department of Chemistry, University of Cambridge Cambridge UK
- Cavendish Laboratory, University of Cambridge Cambridge UK
| | - Johnny Habchi
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
| | - Georg Meisl
- WaveBreak Therapeutics Ltd, Chemistry of Health Lensfield Road Cambridge CB2 1EW UK
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2
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Stephens AD, Villegas AF, Chung CW, Vanderpoorten O, Pinotsi D, Mela I, Ward E, McCoy TM, Cubitt R, Routh AF, Kaminski CF, Kaminski Schierle GS. α-Synuclein fibril and synaptic vesicle interactions lead to vesicle destruction and increased lipid-associated fibril uptake into iPSC-derived neurons. Commun Biol 2023; 6:526. [PMID: 37188797 PMCID: PMC10185682 DOI: 10.1038/s42003-023-04884-1] [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: 11/26/2022] [Accepted: 04/27/2023] [Indexed: 05/17/2023] Open
Abstract
Monomeric alpha-synuclein (aSyn) is a well characterised protein that importantly binds to lipids. aSyn monomers assemble into amyloid fibrils which are localised to lipids and organelles in insoluble structures found in Parkinson's disease patient's brains. Previous work to address pathological aSyn-lipid interactions has focused on using synthetic lipid membranes, which lack the complexity of physiological lipid membranes. Here, we use physiological membranes in the form of synaptic vesicles (SV) isolated from rodent brain to demonstrate that lipid-associated aSyn fibrils are more easily taken up into iPSC-derived cortical i3Neurons. Lipid-associated aSyn fibril characterisation reveals that SV lipids are an integrated part of the fibrils and while their fibril morphology differs from aSyn fibrils alone, the core fibril structure remains the same, suggesting the lipids lead to the increase in fibril uptake. Furthermore, SV enhance the aggregation rate of aSyn, yet increasing the SV:aSyn ratio causes a reduction in aggregation propensity. We finally show that aSyn fibrils disintegrate SV, whereas aSyn monomers cause clustering of SV using small angle neutron scattering and high-resolution imaging. Disease burden on neurons may be impacted by an increased uptake of lipid-associated aSyn which could enhance stress and pathology, which in turn may have fatal consequences for neurons.
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Affiliation(s)
- Amberley D Stephens
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK.
| | - Ana Fernandez Villegas
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Chyi Wei Chung
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
- Department of Physics, Kavli Institute for Nanoscience Discovery, University of Oxford, Oxford, UK
| | - Oliver Vanderpoorten
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
- Department of Physics and Technology, UiT The Arctic University of Norway, Tromsø, Norway
| | - Dorothea Pinotsi
- Scientific Center for Optical and Electron Microscopy, ETH Zürich, Zürich, Switzerland
| | - Ioanna Mela
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
- Department of Pharmacology, University of Cambridge, Cambridge, UK
| | - Edward Ward
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Thomas M McCoy
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | | | - Alexander F Routh
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
| | - Clemens F Kaminski
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge, UK
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3
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Ma L, Li X, Petersen RB, Peng A, Huang K. Probing the interactions between amyloidogenic proteins and bio-membranes. Biophys Chem 2023; 296:106984. [PMID: 36889133 DOI: 10.1016/j.bpc.2023.106984] [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: 12/22/2022] [Revised: 02/11/2023] [Accepted: 02/22/2023] [Indexed: 03/01/2023]
Abstract
Protein misfolding diseases (PMDs) in humans are characterized by the deposition of protein aggregates in tissues, including Alzheimer's disease, Parkinson's disease, type 2 diabetes, and amyotrophic lateral sclerosis. Misfolding and aggregation of amyloidogenic proteins play a central role in the onset and progression of PMDs, and these processes are regulated by multiple factors, especially the interaction between proteins and bio-membranes. Bio-membranes induce conformational changes in amyloidogenic proteins and affect their aggregation; on the other hand, the aggregates of amyloidogenic proteins may cause membrane damage or dysfunction leading to cytotoxicity. In this review, we summarize the factors that affect the binding of amyloidogenic proteins and membranes, the effects of bio-membranes on the aggregation of amyloidogenic proteins, mechanisms of membrane disruption by amyloidogenic aggregates, technical approaches for detecting these interactions, and finally therapeutic strategies targeting membrane damage caused by amyloidogenic proteins.
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Affiliation(s)
- Liang Ma
- Department of Pharmacy, Wuhan Mental Health Center, Wuhan, China; Department of Pharmacy, Wuhan Hospital for Psychotherapy, Wuhan, China
| | - Xi Li
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Robert B Petersen
- Foundational Sciences, Central Michigan University College of Medicine, Mount Pleasant, MI, USA
| | - Anlin Peng
- Department of Pharmacy, The Third Hospital of Wuhan, Tongren Hospital of Wuhan University, Wuhan, China.
| | - Kun Huang
- Tongji School of Pharmacy, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.
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4
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Fridolf S, Pham QD, Pallbo J, Bernfur K, Linse S, Topgaard D, Sparr E. Ganglioside GM3 stimulates lipid-protein co-assembly in α-synuclein amyloid formation. Biophys Chem 2023; 293:106934. [PMID: 36493587 DOI: 10.1016/j.bpc.2022.106934] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 11/04/2022] [Accepted: 11/15/2022] [Indexed: 11/22/2022]
Abstract
Parkinson's disease is characterized by the aggregation of the presynaptic protein α-synuclein (αSyn), and its co-assembly with lipids and other cellular matter in the brain. Here we investigated lipid-protein co-assembly in a system composed of αSyn and model membranes containing the glycolipid ganglioside GM3. We quantified the uptake of lipids into the co-assembled aggregates and investigated how lipid molecular dynamics is altered by being present in the co-assemblies using solution 1H- and solid-state 13C NMR spectroscopy. Aggregate morphology was studied using cryo-TEM. The overall lipid uptake in the co-assembled aggregates was found to increase with the molar ratio of GM3 in the vesicles. The lipids present in the co-assembled aggregates have reduced acyl chain and headgroup dynamics compared to the protein-free bilayer system. These findings may improve our understanding of how different types of lipids can influence the composition of αSyn aggregates, which may have consequences for amyloid formation in vivo.
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Affiliation(s)
- Simon Fridolf
- Division of Physical Chemistry, Lund University, Box 124, 221 00 Lund, Sweden.
| | - Quoc Dat Pham
- Division of Physical Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
| | - Jon Pallbo
- Division of Physical Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
| | - Katja Bernfur
- Biochemistry and Structural Biology, Lund University, Box 124, 221 00 Lund, Sweden
| | - Sara Linse
- Biochemistry and Structural Biology, Lund University, Box 124, 221 00 Lund, Sweden
| | - Daniel Topgaard
- Division of Physical Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
| | - Emma Sparr
- Division of Physical Chemistry, Lund University, Box 124, 221 00 Lund, Sweden
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5
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Feng C, Flores M, Dhoj C, Garcia A, Belleca S, Abbas DA, Parres-Gold J, Anguiano A, Porter E, Wang Y. Observation of α-Synuclein Preformed Fibrils Interacting with SH-SY5Y Neuroblastoma Cell Membranes Using Scanning Ion Conductance Microscopy. ACS Chem Neurosci 2022; 13:3547-3553. [PMID: 36455298 PMCID: PMC9782390 DOI: 10.1021/acschemneuro.2c00478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
Abstract
Parkinson's disease (PD) is the second-most prevalent neurodegenerative disorder in the U.S. α-Synuclein (α-Syn) preformed fibrils (PFFs) have been shown to propagate PD pathology in neuronal populations. However, little work has directly characterized the morphological changes on membranes associated with α-Syn PFFs at a cellular level. Scanning ion conductance microscopy (SICM) is a noninvasive in situ cell imaging technique and therefore uniquely advantageous to investigate PFF-induced membrane changes in neuroblastoma cells. The present work used SICM to monitor cytoplasmic membrane changes of SH-SY5Y neuroblastoma cells after incubation with varying concentrations of α-Syn PFFs. Cell membrane roughness significantly increased as the concentration of α-Syn PFFs increased. Noticeable protrusions that assumed a more crystalline appearance at higher α-Syn PFF concentrations were also observed. Cell viability was only slightly reduced, though statistically significantly, to about 80% but independent of the dose. These observations indicate that within the 48 h treatment period, PFFs continue to accumulate on the cell membranes, leading to membrane roughness increase without causing prominent cell death. Since PFFs did not induce major cell death, these data suggest that early interventions targeting fibrils before further aggregation may prevent the progression of neuron loss in Parkinson's disease.
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Affiliation(s)
- Christina Feng
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States
| | - Marisol Flores
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States
| | - Christina Dhoj
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States
| | - Adaly Garcia
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States
| | - Sheehan Belleca
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States
| | - Dana Abou Abbas
- Department
of Biological Sciences, California State
University, Los Angeles, Los Angeles, California 90032, United States
| | - Jacob Parres-Gold
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States
| | - Aimee Anguiano
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States
| | - Edith Porter
- Department
of Biological Sciences, California State
University, Los Angeles, Los Angeles, California 90032, United States
| | - Yixian Wang
- Department
of Chemistry and Biochemistry, California
State University, Los Angeles, Los Angeles, California 90032, United States,. Telephone: +1-323-343-2353
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6
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Andersson A, Fornasier M, Makasewicz K, Pálmadóttir T, Linse S, Sparr E, Jönsson P. Single-vesicle intensity and colocalization fluorescence microscopy to study lipid vesicle fusion, fission, and lipid exchange. Front Mol Neurosci 2022; 15:1007699. [PMID: 36533132 PMCID: PMC9751204 DOI: 10.3389/fnmol.2022.1007699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Accepted: 10/18/2022] [Indexed: 12/19/2023] Open
Abstract
Interactions of lipid vesicles play important roles in a large variety of functions and dysfunctions in the human body. Vital for several biochemical functions is the interaction between monomeric proteins and lipid membranes, and the induced phenomena such as fusion between vesicles and cell membranes, lipid exchange between the membranes, or vesicle fission. Identification of single events and their frequency of occurrence would provide valuable information about protein-lipid interactions in both healthy and degenerative pathways. In this work, we present a single-vesicle intensity and colocalization fluorescence microscopy assay with a custom-written MATLAB analysis program. The assay can be used to study lipid exchange as well as vesicle fusion and fission between two vesicle populations labeled with different fluorescent dyes. Vesicles from the two populations are first mixed and docked to a glass surface. The sample is then simultaneously imaged using two separate wavelength channels monitoring intensity changes and colocalization of vesicles from the two populations. The monomeric pre-synaptic protein α-synuclein (α-syn) and small unilamellar vesicles consisting of 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC), 1,2-dioleoyl-sn-glycero-3-phospho-L-serine, (DOPS), and monosialotetrahexosylganglioside (GM1) were used as a model system to evaluate the method. From our analysis, neither α-syn induced fusion nor lipid exchange was observed for vesicles consisting of DOPC:DOPS (7:3). However, including 10% GM1 in the vesicles resulted in a 91% increase of the number of vesicles within 10 min, combined with a 57% decrease in the average fluorescence intensity per vesicle, indicating that approximately half of the vesicles underwent fission. The method facilitates the study of lipid vesicle fusion, fission, and lipid exchange under controlled conditions. It also allows these events to be studied for systems with more complex composition including exosomes and lipid-based drug carriers, to enable a better understanding of their physicochemical properties.
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Affiliation(s)
| | | | | | | | | | | | - Peter Jönsson
- Department of Chemistry, Lund University, Lund, Sweden
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7
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Dubackic M, Liu Y, Kelley EG, Hetherington C, Haertlein M, Devos JM, Linse S, Sparr E, Olsson U. α-Synuclein Interaction with Lipid Bilayer Discs. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:10216-10224. [PMID: 35952001 PMCID: PMC9404543 DOI: 10.1021/acs.langmuir.2c01368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/27/2022] [Revised: 07/18/2022] [Indexed: 06/15/2023]
Abstract
α-Synuclein (aSyn) is a 140 residue long protein present in presynaptic termini of nerve cells. The protein is associated with Parkinson's disease, in which case it has been found to self-assemble into long amyloid fibrils forming intracellular inclusions that are also rich in lipids. Furthermore, its synaptic function is proposed to involve interaction with lipid membranes, and hence, it is of interest to understand aSyn-lipid membrane interactions in detail. In this paper we report on the interaction of aSyn with model membranes in the form of lipid bilayer discs. Using a combination of cryogenic transmission electron microscopy and small-angle neutron scattering, we show that circular discs undergo a significant shape transition after the adsorption of aSyn. When aSyn self-assembles into fibrils, aSyn molecules desorb from the bilayer discs, allowing them to recover to their original shape. Interestingly, the desorption process has an all-or-none character, resulting in a binary coexistence of circular bilayer discs with no adsorbed aSyn and deformed bilayer discs having a maximum amount of adsorbed protein. The observed coexistence is consistent with the recent finding of cooperative aSyn adsorption to anionic lipid bilayers.
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Affiliation(s)
- Marija Dubackic
- Physical
Chemistry, Department of Chemistry, Lund
University, SE-22100 Lund, Sweden
| | - Yun Liu
- Center
for Neutron Research, National Institute
of Standards and Technology, Gaithersburg, Maryland 20878, United States
- Chemical
and Biomolecular Engineering Department, University of Delaware, Newark, Delaware 19716, United States
| | - Elizabeth G. Kelley
- Center
for Neutron Research, National Institute
of Standards and Technology, Gaithersburg, Maryland 20878, United States
| | - Crispin Hetherington
- National
Center for High Resolution Electron Microscopy, Centre for Analysis
and Synthesis, Chemistry Centre, Lund University, SE-22100 Lund, Sweden
| | | | | | - Sara Linse
- Biochemistry
and Structural Biology, Department of Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Emma Sparr
- Physical
Chemistry, Department of Chemistry, Lund
University, SE-22100 Lund, Sweden
| | - Ulf Olsson
- Physical
Chemistry, Department of Chemistry, Lund
University, SE-22100 Lund, Sweden
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8
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Lin Y, Ito D, Yoo JM, Lim MH, Yu W, Kawata Y, Lee YH. Dual Effects of Presynaptic Membrane Mimetics on α-Synuclein Amyloid Aggregation. Front Cell Dev Biol 2022; 10:707417. [PMID: 35747692 PMCID: PMC9209734 DOI: 10.3389/fcell.2022.707417] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Accepted: 05/11/2022] [Indexed: 12/25/2022] Open
Abstract
Aggregation of intrinsically disordered α-synuclein (αSN) under various conditions is closely related to synucleinopathies. Although various biological membranes have shown to alter the structure and aggregation propensity of αSN, a thorough understanding of the molecular and mechanical mechanism of amyloidogenesis in membranes remains unanswered. Herein, we examined the structural changes, binding properties, and amyloidogenicity of three variations of αSN mutants under two types of liposomes, 1,2-Dioleoyl-sn-glycero-3-Phosphocholine (DOPC) and presynaptic vesicle mimetic (Mimic) membranes. While neutrally charged DOPC membranes elicited marginal changes in the structure and amyloid fibrillation of αSNs, negatively charged Mimic membranes induced dramatic helical folding and biphasic amyloid generation. At low concentration of Mimic membranes, the amyloid fibrillation of αSNs was promoted in a dose-dependent manner. However, further increases in the concentration constrained the fibrillation process. These results suggest the dual effect of Mimic membranes on regulating the amyloidogenesis of αSN, which is rationalized by the amyloidogenic structure of αSN and condensation-dilution of local αSN concentration. Finally, we propose physicochemical properties of αSN and membrane surfaces, and their propensity to drive electrostatic interactions as decisive factors of amyloidogenesis.
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Affiliation(s)
- Yuxi Lin
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Ochang, South Korea
- Institute for Protein Research, Osaka University, Suita, Japan
- *Correspondence: Yuxi Lin, ; Young-Ho Lee,
| | - Dai Ito
- Department of Brain and Cognitive Science, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Je Min Yoo
- Biographene, Los Angeles, CA, United States
| | - Mi Hee Lim
- Department of Chemistry, Korea Advanced Institute of Science and Technology, Daejeon, South Korea
| | - Wookyung Yu
- Department of Brain and Cognitive Science, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
- Core Protein Resources Center, Daegu Gyeongbuk Institute of Science and Technology, Daegu, South Korea
| | - Yasushi Kawata
- Department of Chemistry and Biotechnology, Graduate School of Engineering, Tottori University, Tottori, Japan
| | - Young-Ho Lee
- Research Center for Bioconvergence Analysis, Korea Basic Science Institute, Ochang, South Korea
- Institute for Protein Research, Osaka University, Suita, Japan
- Bio-Analytical Science, University of Science and Technology, Daejeon, South Korea
- Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon, South Korea
- Research Headquarters, Korea Brain Research Institute, Daegu, South Korea
- *Correspondence: Yuxi Lin, ; Young-Ho Lee,
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9
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Dubackic M, Idini I, Lattanzi V, Liu Y, Martel A, Terry A, Haertlein M, Devos JM, Jackson A, Sparr E, Linse S, Olsson U. On the Cluster Formation of α-Synuclein Fibrils. Front Mol Biosci 2021; 8:768004. [PMID: 34738016 PMCID: PMC8560691 DOI: 10.3389/fmolb.2021.768004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 09/30/2021] [Indexed: 12/05/2022] Open
Abstract
The dense accumulation of α-Synuclein fibrils in neurons is considered to be strongly associated with Parkinson’s disease. These intracellular inclusions, called Lewy bodies, also contain significant amounts of lipids. To better understand such accumulations, it should be important to study α-Synuclein fibril formation under conditions where the fibrils lump together, mimicking what is observed in Lewy bodies. In the present study, we have therefore investigated the overall structural arrangements of α-synuclein fibrils, formed under mildly acidic conditions, pH = 5.5, in pure buffer or in the presence of various model membrane systems, by means of small-angle neutron scattering (SANS). At this pH, α-synuclein fibrils are colloidally unstable and aggregate further into dense clusters. SANS intensities show a power law dependence on the scattering vector, q, indicating that the clusters can be described as mass fractal aggregates. The experimentally observed fractal dimension was d = 2.6 ± 0.3. We further show that this fractal dimension can be reproduced using a simple model of rigid-rod clusters. The effect of dominatingly attractive fibril-fibril interactions is discussed within the context of fibril clustering in Lewy body formation.
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Affiliation(s)
- Marija Dubackic
- Division of Physical Chemistry, Department of Chemistry, Lund University, Lund, Sweden
| | - Ilaria Idini
- Division of Physical Chemistry, Department of Chemistry, Lund University, Lund, Sweden
| | - Veronica Lattanzi
- Division of Physical Chemistry, Department of Chemistry, Lund University, Lund, Sweden.,Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Yun Liu
- Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD, United States.,Chemical and Biomolecular Engineering Department, University of Delaware, Newark, DE, United States
| | | | - Ann Terry
- ISIS Neutron and Muon Source, Harwell Oxford, Didcot, United Kingdom.,Max IV Laboratory, Lund University, Lund, Sweden
| | | | | | - Andrew Jackson
- Division of Physical Chemistry, Department of Chemistry, Lund University, Lund, Sweden.,European Spallation Source, Lund, Sweden
| | - Emma Sparr
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Sara Linse
- Division of Biochemistry and Structural Biology, Department of Chemistry, Lund University, Lund, Sweden
| | - Ulf Olsson
- Division of Physical Chemistry, Department of Chemistry, Lund University, Lund, Sweden
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