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Das D, Mattaparthi VSK. Conformational dynamics of A30G α-synuclein that causes familial Parkinson disease. J Biomol Struct Dyn 2023; 41:14702-14714. [PMID: 36961209 DOI: 10.1080/07391102.2023.2193997] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2022] [Accepted: 02/25/2023] [Indexed: 03/25/2023]
Abstract
The first gene shown to be responsible for autosomal-dominant Parkinson's disease (PD) is the SNCA gene, which encodes for alpha synuclein (α-Syn). Recently, a novel heterozygous A30G mutation of the SNCA gene associated with familial PD has been reported. However, little research has been done on how the A30G mutation affects the structure of α-Syn. So, using atomistic molecular dynamics (MD) simulation, we demonstrate here the key structural characteristics of A30G α-Syn in the free monomer form and membrane associated state. From the MD trajectory analysis, the structure of A30G α-Syn was noticed to exhibit rapid conformational change, increase in backbone flexibility near the site of mutation and decrease in α-helical propensity. The typical torsion angles in residues (Val26 and Glu28) near the mutation site were observed to deviate significantly in A30G α-Syn. In the case of membrane bound A30G α-Syn, the regions that were submerged in the lipid bilayer (N-helix (3-37) and turn region (38-44)) found to contain higher helical content than the elevated region above the lipid surface. The bending angle in the helix-N and helix-C regions were noticed to be relatively higher in the free form of A30G α-Syn (38.50) than in the membrane bound form (370). The A30G mutation in α-Syn was predicted to have an impact on the stability and function of the protein based on ΔΔG values obtained from the online servers. Our results demonstrate that the A30G mutation in α-Syn altered the protein's α-helical structure and slightly altered the membrane binding.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Dorothy Das
- Molecular Modelling and Simulation Laboratory, Department of Molecular Biology and Biotechnology, Tezpur University, Tezpur, Assam, India
| | - Venkata Satish Kumar Mattaparthi
- Molecular Modelling and Simulation Laboratory, Department of Molecular Biology and Biotechnology, Tezpur University, Tezpur, Assam, India
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De Giorgi F, Laferrière F, Zinghirino F, Faggiani E, Lends A, Bertoni M, Yu X, Grélard A, Morvan E, Habenstein B, Dutheil N, Doudnikoff E, Daniel J, Claverol S, Qin C, Loquet A, Bezard E, Ichas F. Novel self-replicating α-synuclein polymorphs that escape ThT monitoring can spontaneously emerge and acutely spread in neurons. SCIENCE ADVANCES 2020; 6:6/40/eabc4364. [PMID: 33008896 PMCID: PMC7852382 DOI: 10.1126/sciadv.abc4364] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 08/11/2020] [Indexed: 05/17/2023]
Abstract
The conformational strain diversity characterizing α-synuclein (α-syn) amyloid fibrils is thought to determine the different clinical presentations of neurodegenerative diseases underpinned by a synucleinopathy. Experimentally, various α-syn fibril polymorphs have been obtained from distinct fibrillization conditions by altering the medium constituents and were selected by amyloid monitoring using the probe thioflavin T (ThT). We report that, concurrent with classical ThT-positive products, fibrillization in saline also gives rise to polymorphs invisible to ThT (τ-). The generation of τ- fibril polymorphs is stochastic and can skew the apparent fibrillization kinetics revealed by ThT. Their emergence has thus been ignored so far or mistaken for fibrillization inhibitions/failures. They present a yet undescribed atomic organization and show an exacerbated propensity toward self-replication in cortical neurons, and in living mice, their injection into the substantia nigra pars compacta triggers a synucleinopathy that spreads toward the dorsal striatum, the nucleus accumbens, and the insular cortex.
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Affiliation(s)
- Francesca De Giorgi
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- INSERM, Laboratoire de Neurosciences Expérimentales et Cliniques, U-1084, Université de Poitiers, Poitiers, France
| | - Florent Laferrière
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
| | - Federica Zinghirino
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Dipartimento di Scienze Biomediche e Biotecnologiche (BIOMETEC), Università degli Studi di Catania, Catania, Italia
| | - Emilie Faggiani
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
| | - Alons Lends
- Institut de Chimie et de Biologie des Membranes et des Nano-objets, Institut Européen de Chimie et Biologie, CNRS, UMR 5248, Université de Bordeaux, Pessac, France
| | - Mathilde Bertoni
- Institut de Chimie et de Biologie des Membranes et des Nano-objets, Institut Européen de Chimie et Biologie, CNRS, UMR 5248, Université de Bordeaux, Pessac, France
| | - Xuan Yu
- Institute of Laboratory Animal Sciences, China Academy of Medical Sciences, Beijing, China
| | - Axelle Grélard
- Institut de Chimie et de Biologie des Membranes et des Nano-objets, Institut Européen de Chimie et Biologie, CNRS, UMR 5248, Université de Bordeaux, Pessac, France
| | - Estelle Morvan
- Université de Bordeaux, CNRS, INSERM, UMS3033/US001, Institut Européen de Chimie et Biologie, Pessac, France
| | - Birgit Habenstein
- Institut de Chimie et de Biologie des Membranes et des Nano-objets, Institut Européen de Chimie et Biologie, CNRS, UMR 5248, Université de Bordeaux, Pessac, France
| | - Nathalie Dutheil
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
| | - Evelyne Doudnikoff
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
| | - Jonathan Daniel
- Institut des Sciences Moléculaires, CNRS, UMR 5255, Université de Bordeaux, Talence, France
| | | | - Chuan Qin
- Institute of Laboratory Animal Sciences, China Academy of Medical Sciences, Beijing, China
| | - Antoine Loquet
- Institut de Chimie et de Biologie des Membranes et des Nano-objets, Institut Européen de Chimie et Biologie, CNRS, UMR 5248, Université de Bordeaux, Pessac, France
| | - Erwan Bezard
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
| | - François Ichas
- CNRS, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France.
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, Bordeaux, France
- INSERM, Laboratoire de Neurosciences Expérimentales et Cliniques, U-1084, Université de Poitiers, Poitiers, France
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