1
|
Suresh K, Dahal E, Badano A. Synthetic β-sheets mimicking fibrillar and oligomeric structures for evaluation of spectral X-ray scattering technique for biomarker quantification. Cell Biosci 2024; 14:26. [PMID: 38374092 PMCID: PMC10877803 DOI: 10.1186/s13578-024-01208-6] [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: 10/19/2023] [Accepted: 01/26/2024] [Indexed: 02/21/2024] Open
Abstract
BACKGROUND Archetypical cross-β spines sharpen the boundary between functional and pathological proteins including β-amyloid, tau, α-synuclein and transthyretin are linked to many debilitating human neurodegenerative and non-neurodegenerative amyloidoses. An increased focus on development of pathogenic β-sheet specific fluid and imaging structural biomarkers and conformation-specific monoclonal antibodies in targeted therapies has been recently observed. Identification and quantification of pathogenic oligomers remain challenging for existing neuroimaging modalities. RESULTS We propose two artificial β-sheets which can mimic the nanoscopic structural characteristics of pathogenic oligomers and fibrils for evaluating the performance of a label free, X-ray based biomarker detection and quantification technique. Highly similar structure with elliptical cross-section and parallel cross-β motif is observed among recombinant α-synuclein fibril, Aβ-42 fibril and artificial β-sheet fibrils. We then use these β-sheet models to assess the performance of spectral small angle X-ray scattering (sSAXS) technique for detecting β-sheet structures. sSAXS showed quantitatively accurate detection of antiparallel, cross-β artificial oligomers from a tissue mimicking environment and significant distinction between different oligomer packing densities such as diffuse and dense packings. CONCLUSION The proposed synthetic β-sheet models mimicked the nanoscopic structural characteristics of β-sheets of fibrillar and oligomeric states of Aβ and α-synuclein based on the ATR-FTIR and SAXS data. The tunability of β-sheet proportions and shapes of structural motifs, and the low-cost of these β-sheet models can become useful test materials for evaluating β-sheet or amyloid specific biomarkers in a wide range of neurological diseases. By using the proposed synthetic β-sheet models, our study indicates that the sSAXS has potential to evaluate different stages of β-sheet-enriched structures including oligomers of pathogenic proteins.
Collapse
Affiliation(s)
- Karthika Suresh
- Division of Imaging, Diagnostics, and Software Reliability, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD, 20993, USA.
| | - Eshan Dahal
- Division of Imaging, Diagnostics, and Software Reliability, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD, 20993, USA
| | - Aldo Badano
- Division of Imaging, Diagnostics, and Software Reliability, Office of Science and Engineering Laboratories, Center for Devices and Radiological Health, Food and Drug Administration, Silver Spring, MD, 20993, USA
| |
Collapse
|
2
|
Cheng L, De Leon-Rodriguez LM, Gilbert EP, Loo T, Petters L, Yang Z. Self-assembly and hydrogelation of a potential bioactive peptide derived from quinoa proteins. Int J Biol Macromol 2024; 259:129296. [PMID: 38199549 DOI: 10.1016/j.ijbiomac.2024.129296] [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: 11/29/2023] [Revised: 12/25/2023] [Accepted: 01/05/2024] [Indexed: 01/12/2024]
Abstract
In this work the identification of peptides derived from quinoa proteins which could potentially self-assemble, and form hydrogels was carried out with TANGO, a statistical mechanical based algorithm that predicts β-aggregate propensity of peptides. Peptides with the highest aggregate propensity were subjected to gelling screening experiments from which the most promising bioactive peptide with sequence KIVLDSDDPLFGGF was selected. The self-assembling and hydrogelation properties of the C-terminal amidated peptide (KIVLDSDDPLFGGF-NH2) were studied. The effect of concentration, pH, and temperature on the secondary structure of the peptide were probed by circular dichroism (CD), while its nanostructure was studied by transmission electron microscopy (TEM) and small-angle neutron scattering (SANS). Results revealed the existence of random coil, α-helix, twisted β-sheet, and well-defined β-sheet secondary structures, with a range of nanostructures including elongated fibrils and bundles, whose proportion was dependant on the peptide concentration, pH, or temperature. The self-assembly of the peptide is demonstrated to follow established models of amyloid formation, which describe the unfolded peptide transiting from an α-helix-containing intermediate into β-sheet-rich protofibrils. The self-assembly is promoted at high concentrations, elevated temperatures, and pH values close to the peptide isoelectric point, and presumably mediated by hydrogen bond, hydrophobic and electrostatic interactions, and π-π interactions (from the F residue). At 15 mg/mL and pH 3.5, the peptide self-assembled and formed a self-supporting hydrogel exhibiting viscoelastic behaviour with G' (1 Hz) ~2300 Pa as determined by oscillatory rheology measurements. The study describes a straightforward method to monitor the self-assembly of plant protein derived peptides; further studies are needed to demonstrate the potential application of the formed hydrogels in food and biomedicine.
Collapse
Affiliation(s)
- Lirong Cheng
- Riddet Institute, Massey University, Palmerston North 4442, New Zealand
| | | | - Elliot Paul Gilbert
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Locked Bag 2001, Kirrawee, NSW, Australia; Centre for Nutrition and Food Sciences, Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD 4072, Australia
| | - Trevor Loo
- BioProtection Aotearoa, School of Natural Sciences, Massey University, Palmerston North 4442, New Zealand
| | - Ludwig Petters
- School of Natural Sciences, Massey University, Palmerston North 4442, New Zealand
| | - Zhi Yang
- School of Food and Advanced Technology, Massey University, Auckland 0632, New Zealand.
| |
Collapse
|
3
|
Lattanzi V, André I, Gasser U, Dubackic M, Olsson U, Linse S. Amyloid β 42 fibril structure based on small-angle scattering. Proc Natl Acad Sci U S A 2021; 118:e2112783118. [PMID: 34815346 PMCID: PMC8640717 DOI: 10.1073/pnas.2112783118] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/19/2021] [Indexed: 01/30/2023] Open
Abstract
Amyloid fibrils are associated with a number of neurodegenerative diseases, including fibrils of amyloid β42 peptide (Aβ42) in Alzheimer's disease. These fibrils are a source of toxicity to neuronal cells through surface-catalyzed generation of toxic oligomers. Detailed knowledge of the fibril structure may thus facilitate therapeutic development. We use small-angle scattering to provide information on the fibril cross-section dimension and shape for Aβ42 fibrils prepared in aqueous phosphate buffer at pH = 7.4 and pH 8.0 under quiescent conditions at 37 °C from pure recombinant Aβ42 peptide. Fitting the data using a continuum model reveals an elliptical cross-section and a peptide mass-per-unit length compatible with two filaments of two monomers, four monomers per plane. To provide a more detailed atomistic model, the data were fitted using as a starting state a high-resolution structure of the two-monomer arrangement in filaments from solid-state NMR (Protein Data Bank ID 5kk3). First, a twofold symmetric model including residues 11 to 42 of two monomers in the filament was optimized in terms of twist angle and local packing using Rosetta. A two-filament model was then built and optimized through fitting to the scattering data allowing the two N-termini in each filament to take different conformations, with the same conformation in each of the two filaments. This provides an atomistic model of the fibril with twofold rotation symmetry around the fibril axis. Intriguingly, no polydispersity as regards the number of filaments was observed in our system over separate samples, suggesting that the two-filament arrangement represents a free energy minimum for the Aβ42 fibril.
Collapse
Affiliation(s)
- Veronica Lattanzi
- Biochemistry and Structural Biology, Lund University, SE-22100 Lund, Sweden;
- Division of Physical Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Ingemar André
- Biochemistry and Structural Biology, Lund University, SE-22100 Lund, Sweden
| | - Urs Gasser
- Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
| | - Marija Dubackic
- Biochemistry and Structural Biology, Lund University, SE-22100 Lund, Sweden
- Division of Physical Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Ulf Olsson
- Division of Physical Chemistry, Lund University, SE-22100 Lund, Sweden
| | - Sara Linse
- Biochemistry and Structural Biology, Lund University, SE-22100 Lund, Sweden
| |
Collapse
|
4
|
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.
Collapse
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
| |
Collapse
|
5
|
Oliva R, Mukherjee SK, Ostermeier L, Pazurek LA, Kriegler S, Bader V, Prumbaum D, Raunser S, Winklhofer KF, Tatzelt J, Winter R. Remodeling of the Fibrillation Pathway of α-Synuclein by Interaction with Antimicrobial Peptide LL-III. Chemistry 2021; 27:11845-11851. [PMID: 34165838 PMCID: PMC8457056 DOI: 10.1002/chem.202101592] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Indexed: 12/22/2022]
Abstract
Liquid‐liquid phase separation (LLPS) has emerged as a key mechanism for intracellular organization, and many recent studies have provided important insights into the role of LLPS in cell biology. There is also evidence that LLPS is associated with a variety of medical conditions, including neurodegenerative disorders. Pathological aggregation of α‐synuclein, which is causally linked to Parkinson's disease, can proceed via droplet condensation, which then gradually transitions to the amyloid state. We show that the antimicrobial peptide LL‐III is able to interact with both monomers and condensates of α‐synuclein, leading to stabilization of the droplet and preventing conversion to the fibrillar state. The anti‐aggregation activity of LL‐III was also confirmed in a cellular model. We anticipate that studying the interaction of antimicrobial‐type peptides with liquid condensates such as α‐synuclein will contribute to the understanding of disease mechanisms (that arise in such condensates) and may also open up exciting new avenues for intervention.
Collapse
Affiliation(s)
- Rosario Oliva
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
| | - Sanjib K Mukherjee
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
| | - Lena Ostermeier
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
| | - Lilli A Pazurek
- Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and Pathobiochemistry, Ruhr University Bochum, Germany
| | - Simon Kriegler
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
| | - Verian Bader
- Department Molecular Cell Biology, Institute of Biochemistry and Pathobiochemistry, Ruhr University Bochum, Germany
| | - Daniel Prumbaum
- Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227, Dortmund, Germany
| | - Stefan Raunser
- Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Otto-Hahn-Strasse 11, 44227, Dortmund, Germany
| | - Konstanze F Winklhofer
- Department Molecular Cell Biology, Institute of Biochemistry and Pathobiochemistry, Ruhr University Bochum, Germany
| | - Jörg Tatzelt
- Department Biochemistry of Neurodegenerative Diseases, Institute of Biochemistry and Pathobiochemistry, Ruhr University Bochum, Germany
| | - Roland Winter
- Physical Chemistry I - Biophysical Chemistry, Faculty of Chemistry and Chemical Biology, TU Dortmund University, Otto-Hahn-Strasse 4a, 44227, Dortmund, Germany
| |
Collapse
|
6
|
van Dalen ME, Vaneyck J, Semerdzhiev SA, Karperien M, Post JN, Claessens MMAE. Protein Adsorption Enhances Energy Dissipation in Networks of Lysozyme Amyloid Fibrils. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:7349-7355. [PMID: 34097425 PMCID: PMC8223478 DOI: 10.1021/acs.langmuir.1c00657] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
Hydrogels of amyloid fibrils are a versatile biomaterial for tissue engineering and other biomedical applications. Their suitability for these applications has been partly ascribed to their excellent and potentially engineerable rheological properties. However, while in biomedical applications the gels have to function in compositionally complex physiological solutions, their rheological behavior is typically only characterized in simple buffers. Here we show that the viscoelastic response of networks of amyloid fibrils of the protein lysozyme in biologically relevant solutions substantially differs from the response in simple buffers. We observe enhanced energy dissipation in both cell culture medium and synovial fluid. We attribute this energy dissipation to interactions of the amyloid fibrils with other molecules in these solutions and especially to the adsorption of the abundantly present protein serum albumin. This finding provides the basis for a better understanding of the performance of amyloid hydrogels in biomedical applications.
Collapse
Affiliation(s)
- Maurice
C. E. van Dalen
- Nanobiophysics,
Faculty of Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede, 7500 AE, The Netherlands
- Developmental
BioEngineering, Faculty of Science and Engineering, TechMed Centre, University of Twente, Enschede, 7500 AE, The Netherlands
| | - Jonathan Vaneyck
- Nanobiophysics,
Faculty of Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede, 7500 AE, The Netherlands
| | - Slav A. Semerdzhiev
- Nanobiophysics,
Faculty of Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede, 7500 AE, The Netherlands
| | - Marcel Karperien
- Developmental
BioEngineering, Faculty of Science and Engineering, TechMed Centre, University of Twente, Enschede, 7500 AE, The Netherlands
| | - Janine N. Post
- Developmental
BioEngineering, Faculty of Science and Engineering, TechMed Centre, University of Twente, Enschede, 7500 AE, The Netherlands
| | - Mireille M. A. E. Claessens
- Nanobiophysics,
Faculty of Science and Technology, Mesa+ Institute for Nanotechnology, University of Twente, Enschede, 7500 AE, The Netherlands
- E-mail:
| |
Collapse
|
7
|
Duraffourg N, Leprince M, Crouzy S, Hamelin O, Usson Y, Signor L, Cavazza C, Forge V, Albertin L. Hybrid Amyloid-Based Redox Hydrogel for Bioelectrocatalytic H 2 Oxidation. Angew Chem Int Ed Engl 2021; 60:14488-14497. [PMID: 33871139 DOI: 10.1002/anie.202101700] [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: 02/03/2021] [Revised: 04/02/2021] [Indexed: 11/10/2022]
Abstract
An artificial amyloid-based redox hydrogel was designed for mediating electron transfer between a [NiFeSe] hydrogenase and an electrode. Starting from a mutated prion-forming domain of fungal protein HET-s, a hybrid redox protein containing a single benzyl methyl viologen moiety was synthesized. This protein was able to self-assemble into structurally homogenous nanofibrils. Molecular modeling confirmed that the redox groups are aligned along the fibril axis and are tethered to its core by a long, flexible polypeptide chain that allows close encounters between the fibril-bound oxidized or reduced redox groups. Redox hydrogel films capable of immobilizing the hydrogenase under mild conditions at the surface of carbon electrodes were obtained by a simple pH jump. In this way, bioelectrodes for the electrocatalytic oxidation of H2 were fabricated that afforded catalytic current densities of up to 270 μA cm-2 , with an overpotential of 0.33 V, under quiescent conditions at 45 °C.
Collapse
Affiliation(s)
- Nicolas Duraffourg
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000, Grenoble, France
| | - Maxime Leprince
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000, Grenoble, France
| | - Serge Crouzy
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000, Grenoble, France
| | - Olivier Hamelin
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000, Grenoble, France
| | - Yves Usson
- Univ. Grenoble Alpes, CNRS, CHU Grenoble Alpes, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), TIMC-IMAG, 38000, Grenoble, France
| | - Luca Signor
- Univ. Grenoble Alpes, CEA, CNRS, IRIG, IBS, 38000, Grenoble, France
| | - Christine Cavazza
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000, Grenoble, France
| | - Vincent Forge
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000, Grenoble, France
| | - Luca Albertin
- Univ. Grenoble Alpes, CNRS, CEA, IRIG, Laboratoire de Chimie et Biologie des Métaux, 38000, Grenoble, France
| |
Collapse
|
8
|
Duraffourg N, Leprince M, Crouzy S, Hamelin O, Usson Y, Signor L, Cavazza C, Forge V, Albertin L. Hybrid Amyloid‐Based Redox Hydrogel for Bioelectrocatalytic H
2
Oxidation. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Nicolas Duraffourg
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 38000 Grenoble France
| | - Maxime Leprince
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 38000 Grenoble France
| | - Serge Crouzy
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 38000 Grenoble France
| | - Olivier Hamelin
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 38000 Grenoble France
| | - Yves Usson
- Univ. Grenoble Alpes CNRS CHU Grenoble Alpes Grenoble INP (Institute of Engineering Univ. Grenoble Alpes) TIMC-IMAG 38000 Grenoble France
| | - Luca Signor
- Univ. Grenoble Alpes CEA CNRS IRIG IBS 38000 Grenoble France
| | - Christine Cavazza
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 38000 Grenoble France
| | - Vincent Forge
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 38000 Grenoble France
| | - Luca Albertin
- Univ. Grenoble Alpes CNRS CEA IRIG Laboratoire de Chimie et Biologie des Métaux 38000 Grenoble France
| |
Collapse
|
9
|
Hardenberg MC, Sinnige T, Casford S, Dada ST, Poudel C, Robinson EA, Fuxreiter M, Kaminksi CF, Kaminski Schierle GS, Nollen EAA, Dobson CM, Vendruscolo M. Observation of an α-synuclein liquid droplet state and its maturation into Lewy body-like assemblies. J Mol Cell Biol 2021; 13:282-294. [PMID: 33386842 DOI: 10.1093/jmcb/mjaa075] [Citation(s) in RCA: 47] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 10/09/2020] [Accepted: 10/29/2020] [Indexed: 12/12/2022] Open
Abstract
Misfolded α-synuclein is a major component of Lewy bodies, which are a hallmark of Parkinson's disease (PD). A large body of evidence shows that α-synuclein can aggregate into amyloid fibrils, but the relationship between α-synuclein self-assembly and Lewy body formation remains unclear. Here, we show, both in vitro and in a Caenorhabditis elegans model of PD, that α-synuclein undergoes liquid‒liquid phase separation by forming a liquid droplet state, which converts into an amyloid-rich hydrogel with Lewy-body-like properties. This maturation process towards the amyloid state is delayed in the presence of model synaptic vesicles in vitro. Taken together, these results suggest that the formation of Lewy bodies may be linked to the arrested maturation of α-synuclein condensates in the presence of lipids and other cellular components.
Collapse
Affiliation(s)
- Maarten C Hardenberg
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Tessa Sinnige
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Sam Casford
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Samuel T Dada
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Chetan Poudel
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, UK
| | - Elizabeth A Robinson
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Monika Fuxreiter
- MTA-DE Laboratory of Protein Dynamics, Department of Biochemistry and Molecular Biology, University of Debrecen, Hungary
| | - Clemens F Kaminksi
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Cambridge CB3 0AS, UK
| | | | - Ellen A A Nollen
- European Research Institute for the Biology of Aging, University Medical Center Groningen, University of Groningen, Groningen 9713 AV, The Netherlands
| | - Christopher M Dobson
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| | - Michele Vendruscolo
- Centre for Misfolding Diseases, Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, UK
| |
Collapse
|
10
|
Anomalous Salt Dependence Reveals an Interplay of Attractive and Repulsive Electrostatic Interactions in α-synuclein Fibril Formation. QRB DISCOVERY 2020. [PMID: 37528959 PMCID: PMC10392692 DOI: 10.1017/qrd.2020.7] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Abstractα-Synuclein (α-syn) is an intrinsically disordered protein with a highly asymmetric charge distribution, whose aggregation is linked to Parkinson’s disease. The effect of ionic strength was investigated at mildly acidic pH (5.5) in the presence of catalytic surfaces in the form of α-syn seeds or anionic lipid vesicles using thioflavin T fluorescence measurements. Similar trends were observed with both surfaces: increasing ionic strength reduced the rate of α-syn aggregation although the surfaces as well as α-syn have a net negative charge at pH 5.5. This anomalous salt dependence implies that short-range attractive electrostatic interactions are critical for secondary nucleation as well as heterogeneous primary nucleation. Such interactions were confirmed in Monte Carlo simulations of α-syn monomers interacting with surface-grafted C-terminal tails, and found to be weakened in the presence of salt. Thus, nucleation of α-syn aggregation depends critically on an attractive electrostatic component that is screened by salt to the extent that it outweighs the screening of the long-range repulsion between negatively charged monomers and negative surfaces. Interactions between the positively charged N-termini of α-syn monomers on the one hand, and the negatively C-termini of α-syn on fibrils or vesicles surfaces on the other hand, are thus critical for nucleation.
Collapse
|
11
|
Rüter A, Kuczera S, Gentile L, Olsson U. Arrested dynamics in a model peptide hydrogel system. SOFT MATTER 2020; 16:2642-2651. [PMID: 32119019 DOI: 10.1039/c9sm02244a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We report here on a peptide hydrogel system, which in contrast to most other such systems, is made up of relatively short fibrillar aggregates, discussing resemblance with colloidal rods. The synthetic model peptides A8K and A10K, where A denotes alanine and K lysine, self-assemble in aqueous solutions into ribbon-like aggregates having an average length 〈L〉 on the order of 100 nm and with a diameter d≈ 6 nm. The aggregates can be seen as weakly charged rigid rods and they undergo an isotropic to nematic phase transition at higher concentrations. Translational motion perpendicular to the rod axis gets strongly hindered when the concentration is increased above the overlap concentration. Similarly, the rotational motion is hindered, leading to very long stress relaxation times. The peptide self-assembly is driven by hydrophobic interactions and due to a net peptide charge the system is colloidally stable. However, at the same time short range, presumably hydrophobic, attractive interactions appear to affect the rheology of the system. Upon screening the long range electrostatic repulsion, with the addition of salt, the hydrophobic attraction becomes more dominant and we observe a transition from a repulsive glassy state to an attractive gel-state of the rod-like peptide aggregates.
Collapse
Affiliation(s)
- Axel Rüter
- Division of Physical Chemistry, Lund University, SE-22100 Lund, Sweden.
| | | | | | | |
Collapse
|
12
|
Peduzzo A, Linse S, Buell AK. The Properties of α-Synuclein Secondary Nuclei Are Dominated by the Solution Conditions Rather than the Seed Fibril Strain. ACS Chem Neurosci 2020; 11:909-918. [PMID: 32069013 DOI: 10.1021/acschemneuro.9b00594] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Amyloid fibrils of α-synuclein (α-syn) are a component of Lewy bodies, the characteristic hallmark of Parkinson's disease. Amyloid fibrils arise through primary nucleation from monomers, which in the case of α-syn is often heterogeneous, followed by the growth of the nuclei by monomer addition. Secondary nucleation corresponds to the formation of new fibrils facilitated by pre-existing fibrils. While it is well-established that the newly added monomer in fibril elongation adopts the conformation of the monomers in the seed ("templating"), it is unclear whether fibrils formed through secondary nucleation of monomers on the surface of seed fibrils copy the structure of the "parent" fibril. Here we show by biochemical and microscopical methods that the secondary nucleation of α-syn, enabled at mildly acidic pH, leads to fibrils that structurally resemble more closely those formed de novo under the same conditions, rather than the seeds if these are formed under different solution conditions. This result has important implications for the mechanistic understanding of the secondary nucleation of amyloid fibrils and its role in the propagation of aggregate pathology in protein misfolding diseases.
Collapse
Affiliation(s)
- Alessia Peduzzo
- Institute of Physical Biology, Heinrich-Heine University, 40225 Düsseldorf, Germany
| | - Sara Linse
- Department of Biochemistry and Structural Biology, Centre for Molecular Protein Science, Lund University, SE-221 00 Lund, Sweden
| | - Alexander K. Buell
- Institute of Physical Biology, Heinrich-Heine University, 40225 Düsseldorf, Germany
- Technical University of Denmark, Department of Biotechnology and Biomedicine, 2800 Lyngby, Denmark
| |
Collapse
|