1
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Schepers J, Löser T, Behl C. Lipids and α-Synuclein: adding further variables to the equation. Front Mol Biosci 2024; 11:1455817. [PMID: 39188788 PMCID: PMC11345258 DOI: 10.3389/fmolb.2024.1455817] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2024] [Accepted: 07/26/2024] [Indexed: 08/28/2024] Open
Abstract
Aggregation of alpha-Synuclein (αSyn) has been connected to several neurodegenerative diseases, such as Parkinson's disease (PD), dementia with Lewy Bodies (DLB), and multiple system atrophy (MSA), that are collected under the umbrella term synucleinopathies. The membrane binding abilities of αSyn to negatively charged phospholipids have been well described and are connected to putative physiological functions of αSyn. Consequently, αSyn-related neurodegeneration has been increasingly connected to changes in lipid metabolism and membrane lipid composition. Indeed, αSyn aggregation has been shown to be triggered by the presence of membranes in vitro, and some genetic risk factors for PD and DLB are associated with genes coding for proteins directly involved in lipid metabolism. At the same time, αSyn aggregation itself can cause alterations of cellular lipid composition and brain samples of patients also show altered lipid compositions. Thus, it is likely that there is a reciprocal influence between cellular lipid composition and αSyn aggregation, which can be further affected by environmental or genetic factors and ageing. Little is known about lipid changes during physiological ageing and regional differences of the lipid composition of the aged brain. In this review, we aim to summarise our current understanding of lipid changes in connection to αSyn and discuss open questions that need to be answered to further our knowledge of αSyn related neurodegeneration.
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Affiliation(s)
| | | | - Christian Behl
- The Autophagy Lab, Institute of Pathobiochemistry, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
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2
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Rose K, Jepson T, Shukla S, Maya-Romero A, Kampmann M, Xu K, Hurley JH. Tau fibrils induce nanoscale membrane damage and nucleate cytosolic tau at lysosomes. Proc Natl Acad Sci U S A 2024; 121:e2315690121. [PMID: 38781206 PMCID: PMC11145263 DOI: 10.1073/pnas.2315690121] [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: 09/09/2023] [Accepted: 04/08/2024] [Indexed: 05/25/2024] Open
Abstract
The prion-like spread of protein aggregates is a leading hypothesis for the propagation of neurofibrillary lesions in the brain, including the spread of tau inclusions associated with Alzheimer's disease. The mechanisms of cellular uptake of tau seeds and subsequent nucleated polymerization of cytosolic tau are major questions in the field, and the potential for coupling between the entry and nucleation mechanisms has been little explored. We found that in primary astrocytes and neurons, endocytosis of tau seeds leads to their accumulation in lysosomes. This in turn leads to lysosomal swelling, deacidification, and recruitment of ESCRT proteins, but not Galectin-3, to the lysosomal membrane. These observations are consistent with nanoscale damage of the lysosomal membrane. Live cell imaging and STORM superresolution microscopy further show that the nucleation of cytosolic tau occurs primarily at the lysosome membrane under these conditions. These data suggest that tau seeds escape from lysosomes via nanoscale damage rather than wholesale rupture and that nucleation of cytosolic tau commences as soon as tau fibril ends emerge from the lysosomal membrane.
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Affiliation(s)
- Kevin Rose
- Department of Molecular and Cell Biology, University of California, Berkeley, CA94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA94720
| | - Tyler Jepson
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA94720
- Graduate Group in Biophysics, University of California, Berkeley, CA94720
| | - Sankalp Shukla
- Department of Molecular and Cell Biology, University of California, Berkeley, CA94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA94720
| | - Alex Maya-Romero
- Department of Molecular and Cell Biology, University of California, Berkeley, CA94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA94720
| | - Martin Kampmann
- Institute for Neurodegenerative Diseases, University of California, San Francisco, CA94158
- Department of Biochemistry and Biophysics, University of California, San Francisco, CA94158
| | - Ke Xu
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA94720
- Graduate Group in Biophysics, University of California, Berkeley, CA94720
- Department of Chemistry, University of California, Berkeley, CA94720
| | - James H. Hurley
- Department of Molecular and Cell Biology, University of California, Berkeley, CA94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA94720
- Graduate Group in Biophysics, University of California, Berkeley, CA94720
- Helen Wills Neuroscience Institute, University of California, Berkeley, CA94720
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3
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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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4
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Makasewicz K, Linse S, Sparr E. Interplay of α-synuclein with Lipid Membranes: Cooperative Adsorption, Membrane Remodeling and Coaggregation. JACS AU 2024; 4:1250-1262. [PMID: 38665673 PMCID: PMC11040681 DOI: 10.1021/jacsau.3c00579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2023] [Revised: 01/18/2024] [Accepted: 01/18/2024] [Indexed: 04/28/2024]
Abstract
α-Synuclein is a small neuronal protein enriched at presynaptic termini. It is hypothesized to play a role in neurotransmitter release and synaptic vesicle cycling, while the formation of α-synuclein amyloid fibrils is associated with several neurodegenerative diseases, most notably Parkinson's Disease. The molecular mechanisms of both the physiological and pathological functions of α-synuclein remain to be fully understood, but in both cases, interactions with membranes play an important role. In this Perspective, we discuss several aspects of α-synuclein interactions with lipid membranes including cooperative adsorption, membrane remodeling and α-synuclein amyloid fibril formation in the presence of lipid membranes. We highlight the coupling between the different phenomena and their interplay in the context of physiological and pathological functions of α-synuclein.
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Affiliation(s)
- Katarzyna Makasewicz
- Division
of Physical Chemistry, Center for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
| | - Sara Linse
- Biochemistry
and Structural Biology, Lund University, SE-22100 Lund, Sweden
| | - Emma Sparr
- Department
of Chemistry, Lund University, P.O. Box 124, SE-22100 Lund, Sweden
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5
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Muñoz-Juan A, Benseny-Cases N, Guha S, Barba I, Caldwell KA, Caldwell GA, Agulló L, Yuste VJ, Laromaine A, Dalfó E. Caenorhabditis elegans RAC1/ced-10 mutants as a new animal model to study very early stages of Parkinson's disease. Prog Neurobiol 2024; 234:102572. [PMID: 38253120 DOI: 10.1016/j.pneurobio.2024.102572] [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: 07/31/2023] [Revised: 11/21/2023] [Accepted: 01/15/2024] [Indexed: 01/24/2024]
Abstract
Patients with Parkinson's disease (PD) display non-motor symptoms arising prior to the appearance of motor signs and before a clear diagnosis. Motor and non-motor symptoms correlate with progressive deposition of the protein alpha-synuclein (Asyn) both within and outside of the central nervous system, and its accumulation parallels neurodegeneration. The genome of Caenorhabditis elegans does not encode a homolog of Asyn, thus rendering this nematode an invaluable system with which to investigate PD-related mechanisms in the absence of interference from endogenous Asyn aggregation. CED-10 is the nematode homolog of human RAC1, a small GTPase needed to maintain the function and survival of dopaminergic neurons against human Asyn-induced toxicity in C. elegans. Here, we introduce C. elegans RAC1/ced-10 mutants as a predictive tool to investigate early PD symptoms before neurodegeneration occurs. Deep phenotyping of these animals reveals that, early in development, they displayed altered defecation cycles, GABAergic abnormalities and an increased oxidation index. Moreover, they exhibited altered lipid metabolism evidenced by the accumulation of lipid droplets. Lipidomic fingerprinting indicates that phosphatidylcholine and sphingomyelin, but not phosphatidylethanolamine or phosphatidylserine, were elevated in RAC1/ced-10 mutant nematodes. These collective characteristics reflect the non-motor dysfunction, GABAergic neurotransmission defects, upregulation of stress response mechanisms, and metabolic changes associated with early-onset PD. Thus, we put forward an easy-to-manipulate preclinical animal model to deepen our understanding of early-stage PD and accelerate the translational path for therapeutic target discovery.
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Affiliation(s)
- A Muñoz-Juan
- Group of Nanoparticles and Nanocomposites, Institut Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - N Benseny-Cases
- Biophysics Unit. Department of Biochemistry and Molecular Biology. Universitat Autònoma de Barcelona, Bellaterra 08193, Barcelona, Spain
| | - S Guha
- Nautilus Biotechnology, 835 Industrial Rd, San Carlos, CA 94070, USA
| | - I Barba
- Faculty of Medicine, University of Vic-Central University of Catalonia (UVic-UCC), Institute for Research and Innovation in Life Sciences and Health in Central Catalonia (IRIS-CC), Can Baumann, 08500 Vic, Spain
| | - K A Caldwell
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL 35487, USA; Department of Neurology, Center for Neurodegeneration and Experimental Therapeutics, and Nathan Shock Center of Excellence in the Basic Biology of Aging, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL 35294, USA
| | - G A Caldwell
- Department of Biological Sciences, The University of Alabama, Tuscaloosa, AL 35487, USA; Department of Neurology, Center for Neurodegeneration and Experimental Therapeutics, and Nathan Shock Center of Excellence in the Basic Biology of Aging, University of Alabama at Birmingham Heersink School of Medicine, Birmingham, AL 35294, USA
| | - L Agulló
- Faculty of Medicine, University of Vic-Central University of Catalonia (UVic-UCC), Institute for Research and Innovation in Life Sciences and Health in Central Catalonia (IRIS-CC), Can Baumann, 08500 Vic, Spain
| | - V J Yuste
- Department of Biochemistry and Molecular Biology, Institut de Neurociències, Faculty of Medicine, M2, Universitat Autònoma de Barcelona (UAB), Bellaterra Campus, Cerdanyola del Vallés, Barcelona, Spain
| | - A Laromaine
- Group of Nanoparticles and Nanocomposites, Institut Ciència de Materials de Barcelona, ICMAB-CSIC, Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - E Dalfó
- Faculty of Medicine, University of Vic-Central University of Catalonia (UVic-UCC), Institute for Research and Innovation in Life Sciences and Health in Central Catalonia (IRIS-CC), Can Baumann, 08500 Vic, Spain; Department of Biochemistry and Molecular Biology, Institut de Neurociències, Faculty of Medicine, M2, Universitat Autònoma de Barcelona (UAB), Bellaterra Campus, Cerdanyola del Vallés, Barcelona, Spain; Institute of Neurosciences, Faculty of Medicine, Universitat Autònoma de Barcelona (UAB), Campus UAB, 08193 Cerdanyola del Vallès, Spain.
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6
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Andersson A, Linse S, Sparr E, Fornasier M, Jönsson P. The density of anionic lipids modulates the adsorption of α-Synuclein onto lipid membranes. Biophys Chem 2024; 305:107143. [PMID: 38100855 DOI: 10.1016/j.bpc.2023.107143] [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: 09/22/2023] [Revised: 11/20/2023] [Accepted: 11/28/2023] [Indexed: 12/17/2023]
Abstract
α-Synuclein is an intrinsically disordered presynaptic protein associated with Parkinson's disease. The physiological role of α-Synuclein is not fully understood, but the protein is known to interact with lipid membranes. We here study how membrane charge affects the adsorption of α-Synuclein to (i) supported lipid bilayers and (ii) small unilamellar vesicles with varying amounts of anionic lipids. The results showed that α-Synuclein adsorbs onto membranes containing ≥5% anionic phosphatidylserine (DOPS) lipids, but not to membranes containing ≤1% DOPS. The density of adsorbed α-Synuclein increased steadily with the DOPS content up to 20% DOPS, after which it leveled off. The vesicles were saturated with α-Synuclein at a 3-5 times higher protein density compared to the supported bilayers, which suggests that a more deformable membrane binds more α-Synuclein. Altogether, the results show that both membrane charge density and flexibility influence the association of α-Synuclein to lipid membranes.
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Affiliation(s)
| | - Sara Linse
- Department of Chemistry, Lund University, Lund, Sweden
| | - Emma Sparr
- Department of Chemistry, Lund University, Lund, Sweden
| | | | - Peter Jönsson
- Department of Chemistry, Lund University, Lund, Sweden.
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7
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Gilbert J, Ermilova I, Fornasier M, Skoda M, Fragneto G, Swenson J, Nylander T. On the interactions between RNA and titrateable lipid layers: implications for RNA delivery with lipid nanoparticles. NANOSCALE 2024; 16:777-794. [PMID: 38088740 DOI: 10.1039/d3nr03308b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2024]
Abstract
Characterising the interaction between cationic ionisable lipids (CIL) and nucleic acids (NAs) is key to understanding the process of RNA lipid nanoparticle (LNP) formation and release of NAs from LNPs. Here, we have used different surface techniques to reveal the effect of pH and NA type on the interaction with a model system of DOPC and the CIL DLin-MC3-DMA (MC3). At only 5% MC3, differences in the structure and dynamics of the lipid layer were observed. Both pH and %MC3 were shown to affect the absorption behaviour of erythropoietin mRNA, polyadenylic acid (polyA) and polyuridylic acid (polyU). The adsorbed amount of all studied NAs was found to increase with decreasing pH and increasing %MC3 but with different effects on the lipid layer, which could be linked to the NA secondary structure. For polyA at pH 6, adsorption to the surface of the layer was observed, whereas for other conditions and NAs, penetration of the NA into the layer resulted in the formation of a multilayer structure. By comparison to simulations excluding the secondary structure, differences in adsorption behaviours between polyA and polyU could be observed, indicating that the NA's secondary structure also affected the MC3-NA interactions.
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Affiliation(s)
- Jennifer Gilbert
- Division of Physical Chemistry, Department of Chemistry, Naturvetarvägen 14, Lund University, 22362 Lund, Sweden.
- NanoLund, Lund University, Professorsgatan 1, 223 63 Lund, Sweden
| | - Inna Ermilova
- Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Marco Fornasier
- Division of Physical Chemistry, Department of Chemistry, Naturvetarvägen 14, Lund University, 22362 Lund, Sweden.
| | - Maximilian Skoda
- ISIS Neutron and Muon Source, Rutherford Appleton Laboratory, Harwell, Oxford OX11 0QX, UK
| | - Giovanna Fragneto
- Institut Laue-Langevin, 71 avenue des Martyrs, CS 20156, 38042 Grenoble, France
- European Spallation Source ERIC, P.O. Box 176, SE-221 00 Lund, Sweden
| | - Jan Swenson
- Department of Physics, Chalmers University of Technology, 412 96 Gothenburg, Sweden
| | - Tommy Nylander
- Division of Physical Chemistry, Department of Chemistry, Naturvetarvägen 14, Lund University, 22362 Lund, Sweden.
- NanoLund, Lund University, Professorsgatan 1, 223 63 Lund, Sweden
- Lund Institute of Advanced Neutron and X-Ray Science, Scheelevägen 19, 223 70 Lund, Sweden
- School of Chemical Engineering and Translational Nanobioscience Research Center, Sungkyunkwan University, Suwon, Republic of Korea
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8
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Zhang N, Yan Z, Xin H, Shao S, Xue S, Cespuglio R, Wang S. Relationship among α‑synuclein, aging and inflammation in Parkinson's disease (Review). Exp Ther Med 2024; 27:23. [PMID: 38125364 PMCID: PMC10728906 DOI: 10.3892/etm.2023.12311] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Accepted: 10/19/2023] [Indexed: 12/23/2023] Open
Abstract
Parkinson's disease (PD) is a common neurodegenerative pathology whose major clinical symptoms are movement disorders. The main pathological characteristics of PD are the selective death of dopaminergic (DA) neurons in the pars compacta of the substantia nigra and the presence of Lewy bodies containing α-synuclein (α-Syn) within these neurons. PD is associated with numerous risk factors, including environmental factors, genetic mutations and aging. In many cases, the complex interplay of numerous risk factors leads to the onset of PD. The mutated α-Syn gene, which expresses pathologicalα-Syn protein, can cause PD. Another important feature of PD is neuroinflammation, which is conducive to neuronal death. α-Syn is able to interact with certain cell types in the brain, including through phagocytosis and degradation of α-Syn by glial cells, activation of inflammatory pathways by α-Syn in glial cells, transmission of α-Syn between glial cells and neurons, and interactions between peripheral immune cells and α-Syn. In addition to the aforementioned risk factors, PD may also be associated with aging, as the prevalence of PD increases with advancing age. The aging process impairs the cellular clearance mechanism, which leads to chronic inflammation and the accumulation of intracellular α-Syn, which results in DA neuronal death. In the present review, the age-associated α-Syn pathogenicity and the interactions between α-Syn and certain types of cells within the brain are discussed to facilitate understanding of the mechanisms of PD pathogenesis, which may potentially provide insight for the future clinical treatment of PD.
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Affiliation(s)
- Nianping Zhang
- Postdoctoral Mobile Station, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, P.R. China
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, P.R. China
| | - Zhaoli Yan
- Department of Neurosurgery, Affiliated Hospital of Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250014, P.R. China
| | - Hua Xin
- Department of Neurology, People's Hospital of Rizhao, Rizhao, Shandong 276800, P.R. China
| | - Shuai Shao
- Department of Reproductive Medicine, Jingmen People's Hospital, Jingmen, Hubei 448000, P.R. China
| | - Song Xue
- Experimental Center, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, P.R. China
| | - Raymond Cespuglio
- Neuroscience Research Center of Lyon (CNRL), Claude-Bernard Lyon-1 University, 69500 Lyon, France
| | - Shijun Wang
- Department of Pathology, College of Traditional Chinese Medicine, Shandong University of Traditional Chinese Medicine, Jinan, Shandong 250355, P.R. China
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9
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Roeters SJ, Strunge K, Pedersen KB, Golbek TW, Bregnhøj M, Zhang Y, Wang Y, Dong M, Nielsen J, Otzen DE, Schiøtt B, Weidner T. Elevated concentrations cause upright alpha-synuclein conformation at lipid interfaces. Nat Commun 2023; 14:5731. [PMID: 37723164 PMCID: PMC10507035 DOI: 10.1038/s41467-023-39843-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Accepted: 06/23/2023] [Indexed: 09/20/2023] Open
Abstract
The amyloid aggregation of α-synuclein (αS), related to Parkinson's disease, can be catalyzed by lipid membranes. Despite the importance of lipid surfaces, the 3D-structure and orientation of lipid-bound αS is still not known in detail. Here, we report interface-specific vibrational sum-frequency generation (VSFG) experiments that reveal how monomeric αS binds to an anionic lipid interface over a large range of αS-lipid ratios. To interpret the experimental data, we present a frame-selection method ("ViscaSelect") in which out-of-equilibrium molecular dynamics simulations are used to generate structural hypotheses that are compared to experimental amide-I spectra via excitonic spectral calculations. At low and physiological αS concentrations, we derive flat-lying helical structures as previously reported. However, at elevated and potentially disease-related concentrations, a transition to interface-protruding αS structures occurs. Such an upright conformation promotes lateral interactions between αS monomers and may explain how lipid membranes catalyze the formation of αS amyloids at elevated protein concentrations.
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Affiliation(s)
- Steven J Roeters
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark.
- Department of Anatomy and Neurosciences, Amsterdam UMC, Vrije Universiteit, De Boelelaan 1108, 1081 HZ, Amsterdam, The Netherlands.
| | - Kris Strunge
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Kasper B Pedersen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Thaddeus W Golbek
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Mikkel Bregnhøj
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Yuge Zhang
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Yin Wang
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Mingdong Dong
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Janni Nielsen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Daniel E Otzen
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Birgit Schiøtt
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, 8000, Aarhus C, Denmark
| | - Tobias Weidner
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark.
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10
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Rose K, Jepson T, Shukla S, Maya-Romero A, Kampmann M, Xu K, Hurley JH. Tau fibrils induce nanoscale membrane damage and nucleate cytosolic tau at lysosomes. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.08.28.555157. [PMID: 37693477 PMCID: PMC10491128 DOI: 10.1101/2023.08.28.555157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/12/2023]
Abstract
The prion-like spread of protein aggregates is a leading hypothesis for the propagation of neurofibrillary lesions in the brain, including the spread of tau inclusions associated with Alzheimer's disease. The mechanisms of cellular uptake of tau seeds and subsequent nucleated polymerization of cytosolic tau are major questions in the field, and the potential for coupling between the entry and nucleation mechanisms has been little explored. We found that in primary astrocytes, endocytosis of tau seeds leads to their accumulation in lysosomes. This in turn leads to lysosomal swelling, deacidification and recruitment of ESCRT proteins, but not Galectin-3, to the lysosomal membrane. These observations are consistent with nanoscale damage of the lysosomal membrane. Using live cell and STORM, imaging, nucleation of cytosolic tau occurs primarily at the lysosome membrane under these conditions. These data suggest that tau seeds escape from lysosomes via nanoscale damage rather than wholesale rupture, and that nucleation of cytosolic tau commences as soon as tau fibril ends emerge from the lysosomal membrane.
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Affiliation(s)
- Kevin Rose
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720
| | - Tyler Jepson
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720
- Graduate Group in Biophysics, University of California, Berkeley, CA 94720
| | - Sankalp Shukla
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720
| | - Alex Maya-Romero
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720
| | - Martin Kampmann
- Institute for Neurodegenerative Diseases, University of California, San Francisco, California 94158
- Department of Biochemistry and Biophysics, University of California, San Francisco, California 94158
| | - Ke Xu
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720
- Graduate Group in Biophysics, University of California, Berkeley, CA 94720
- Department of Chemistry, University of California, Berkeley, CA 94720
| | - James H. Hurley
- Department of Molecular and Cell Biology, University of California, Berkeley, CA 94720
- California Institute for Quantitative Biosciences, University of California, Berkeley, CA 94720
- Graduate Group in Biophysics, University of California, Berkeley, CA 94720
- Helen Wills Neuroscience Institute, University of California, Berkeley, CA 94720
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11
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Pálmadóttir T, Waudby CA, Bernfur K, Christodoulou J, Linse S, Malmendal A. Morphology-Dependent Interactions between α-Synuclein Monomers and Fibrils. Int J Mol Sci 2023; 24:5191. [PMID: 36982264 PMCID: PMC10049171 DOI: 10.3390/ijms24065191] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Revised: 03/03/2023] [Accepted: 03/04/2023] [Indexed: 03/11/2023] Open
Abstract
Amyloid fibrils may adopt different morphologies depending on the solution conditions and the protein sequence. Here, we show that two chemically identical but morphologically distinct α-synuclein fibrils can form under identical conditions. This was observed by nuclear magnetic resonance (NMR), circular dichroism (CD), and fluorescence spectroscopy, as well as by cryo-transmission electron microscopy (cryo-TEM). The results show different surface properties of the two morphologies, A and B. NMR measurements show that monomers interact differently with the different fibril surfaces. Only a small part of the N-terminus of the monomer interacts with the fibril surface of morphology A, compared to a larger part of the monomer for morphology B. Differences in ThT binding seen by fluorescence titrations, and mesoscopic structures seen by cryo-TEM, support the conclusion of the two morphologies having different surface properties. Fibrils of morphology B were found to have lower solubility than A. This indicates that fibrils of morphology B are thermodynamically more stable, implying a chemical potential of fibrils of morphology B that is lower than that of morphology A. Consequently, at prolonged incubation time, fibrils of morphology B remained B, while an initially monomorphic sample of morphology A gradually transformed to B.
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Affiliation(s)
- Tinna Pálmadóttir
- Biochemistry and Structural Biology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden; (K.B.); (A.M.)
| | - Christopher A. Waudby
- Institute of Structural and Molecular Biology, University College and Birkbeck College, London WC1E 7HX, UK; (C.A.W.); (J.C.)
- School of Pharmacy, University College London, London WC1N 1AX, UK
| | - Katja Bernfur
- Biochemistry and Structural Biology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden; (K.B.); (A.M.)
| | - John Christodoulou
- Institute of Structural and Molecular Biology, University College and Birkbeck College, London WC1E 7HX, UK; (C.A.W.); (J.C.)
| | - Sara Linse
- Biochemistry and Structural Biology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden; (K.B.); (A.M.)
| | - Anders Malmendal
- Biochemistry and Structural Biology, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden; (K.B.); (A.M.)
- Department of Science and Environment, Roskilde University, P.O. Box 260, DK-4000 Roskilde, Denmark
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12
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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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13
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Iyer A, Sidhu A, Subramaniam V. How important is the N-terminal acetylation of alpha-synuclein for its function and aggregation into amyloids? Front Neurosci 2022; 16:1003997. [PMID: 36466161 PMCID: PMC9709446 DOI: 10.3389/fnins.2022.1003997] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Accepted: 10/26/2022] [Indexed: 08/27/2023] Open
Abstract
N-α-acetylation is a frequently occurring post-translational modification in eukaryotic proteins. It has manifold physiological consequences on the regulation and function of several proteins, with emerging studies suggesting that it is a global regulator of stress responses. For decades, in vitro biochemical investigations into the precise role of the intrinsically disordered protein alpha-synuclein (αS) in the etiology of Parkinson's disease (PD) were performed using non-acetylated αS. The N-terminus of α-synuclein is now unequivocally known to be acetylated in vivo, however, there are many aspects of this post-translational modifications that are not understood well. Is N-α-acetylation of αS a constitutive modification akin to most cellular proteins, or is it spatio-temporally regulated? Is N-α-acetylation of αS relevant to the as yet elusive function of αS? How does the N-α-acetylation of αS influence the aggregation of αS into amyloids? Here, we provide an overview of the current knowledge and discuss prevailing hypotheses on the impact of N-α-acetylation of αS on its conformational, oligomeric, and fibrillar states. The extent to which N-α-acetylation of αS is vital for its function, membrane binding, and aggregation into amyloids is also explored here. We further discuss the overall significance of N-α-acetylation of αS for its functional and pathogenic implications in Lewy body formation and synucleinopathies.
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Affiliation(s)
- Aditya Iyer
- Department of Biochemistry, Groningen Biomolecular Sciences and Biotechnology Institute, University of Groningen, Groningen, Netherlands
| | - Arshdeep Sidhu
- Nitte University Centre for Science Education and Research, Nitte University (DU), Mangalore, India
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14
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Lipidomics: An excellent tool for chronic disease detection. Curr Res Transl Med 2022; 70:103346. [PMID: 35487168 DOI: 10.1016/j.retram.2022.103346] [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: 03/27/2021] [Revised: 03/10/2022] [Accepted: 04/04/2022] [Indexed: 01/31/2023]
Abstract
It has been known as almost all the cells consists a lipid molecule which has a considerable impact in various biological processes. Lipids have been investigated with a potential role for the formation of cellular membrane and thereby maintaining the structural integrity. Omics has placed as a combined technologies utilized for an exploaration of mechanistic actions in several kinds of molecules that make up the cells of an organism. Lipidomics has been recognized as a newly emerged branch of omics technology. This technology has the captivating factors to classify and characterize almost all the cellular lipids with the help of various analytical techniques and computational biological plateform. In lipidomics studies, structural display of several lipid biomarkers could also be analyzed and considered for actual disease diagnosis procedures. This could also replace certain traditional diagnostics method at all over the globe. Our review focuses how important this lipidomics particularly in disease diagnosis and also covers various analytical techniques and computational methods or bioinformatics tools in for the diagnosis of disease. In addtion, we also pinponted the possible role of lipids in several kinds of cellular disorders including cancer, neurodegenerative diseases, cardiovascular diseases, diabetes and obesity in human population. .
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15
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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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16
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A Palette of Fluorescent A β42 Peptides Labelled at a Range of Surface-Exposed Sites. Int J Mol Sci 2022; 23:ijms23031655. [PMID: 35163577 PMCID: PMC8836192 DOI: 10.3390/ijms23031655] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/23/2022] [Accepted: 01/27/2022] [Indexed: 01/27/2023] Open
Abstract
Fluorescence-based single molecule techniques provide important tools towards understanding the molecular mechanism of complex neurodegenerative diseases. This requires efficient covalent attachment of fluorophores. Here we create a series of cysteine mutants (S8C, Y10C, S26C, V40C, and A42C) of Aβ42, involved in Alzheimer’s disease, based on exposed positions in the fibril structure and label them with the Alexa-fluorophores using maleimide chemistry. Direct stochastic optical reconstruction microscopy imaging shows that all the labelled mutants form fibrils that can be detected by virtue of Alexa fluorescence. Aggregation assays and cryo-electron micrographs establish that the careful choice of labelling position minimizes the perturbation of the aggregation process and fibril structure. Peptides labelled at the N-terminal region, S8C and Y10C, form fibrils independently and with wild-type. Peptides labelled at the fibril core surface, S26C, V40C and A42C, form fibrils only in mixture with wild-type peptide. This can be understood on the basis of a recent fibril model, in which S26, V40 and A42 are surface exposed in two out of four monomers per fibril plane. We provide a palette of fluorescently labelled Aβ42 peptides that can be used to gain understanding of the complex mechanisms of Aβ42 self-assembly and help to develop a more targeted approach to cure the disease.
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Abstract
Abstract
α-Synuclein is a small neuronal protein that reversibly associates with lipid membranes. The membrane interactions are believed to be central to the healthy function of this protein involved in synaptic plasticity and neurotransmitter release. α-Synuclein has been speculated to induce vesicle fusion as well as fission, processes which are analogous to each other but proceed in different directions and involve different driving forces. In the current work, we analyse α-synuclein-induced small unilamellar vesicle deformation from a thermodynamics point of view. We show that the structures interpreted in the literature as fusion intermediates are in fact a stable deformed state and neither fusion nor vesicle clustering occurs. We speculate on the driving force for the observed deformation and put forward a hypothesis that α-synuclein self-assembly on the lipid membrane precedes and induces membrane remodelling.
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