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Mehra S, Ahlawat S, Kumar H, Datta D, Navalkar A, Singh N, Patel K, Gadhe L, Kadu P, Kumar R, Jha NN, Sakunthala A, Sawner AS, Padinhateeri R, Udgaonkar JB, Agarwal V, Maji SK. α-Synuclein aggregation intermediates form fibril polymorphs with distinct prion-like properties. J Mol Biol 2022; 434:167761. [PMID: 35907572 DOI: 10.1016/j.jmb.2022.167761] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 07/17/2022] [Accepted: 07/21/2022] [Indexed: 11/26/2022]
Abstract
α-Synuclein (α-Syn) amyloids in synucleinopathies are suggested to be structurally and functionally diverse, reminiscent of prion-like strains. But how the aggregation of the same precursor protein results in the formation of fibril polymorphs remains elusive. Here, we demonstrate the structure-function relationship of two polymorphs, pre-matured fibrils (PMFs) and helix-matured fibrils (HMFs), based on α-Syn aggregation intermediates. These polymorphs display the structural differences as demonstrated by solid-state NMR and mass spectrometry studies and also possess different cellular activities such as seeding, internalization, and cell-to-cell transfer of aggregates. HMFs with a compact core structure exhibit low seeding potency but readily internalize and transfer from one cell to another. The less structured PMFs lack transcellular transfer ability but induce abundant α-Syn pathology and trigger the formation of aggresomes in cells. Overall, the study highlights that the conformational heterogeneity in the aggregation pathway may lead to fibril polymorphs with distinct prion-like behavior.
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Affiliation(s)
- Surabhi Mehra
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Sahil Ahlawat
- Tata Institute of Fundamental Research, Sy. No. 36/P, Gopanpally, Hyderabad-500 046, India
| | - Harish Kumar
- Indian Institute of Science Education and Research, Pune- 411 008, India; National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru 560065, India
| | - Debalina Datta
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Ambuja Navalkar
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Nitu Singh
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Komal Patel
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Laxmikant Gadhe
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Pradeep Kadu
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Rakesh Kumar
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Narendra N Jha
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Arunima Sakunthala
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Ajay S Sawner
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Ranjith Padinhateeri
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India
| | - Jayant B Udgaonkar
- Indian Institute of Science Education and Research, Pune- 411 008, India; National Centre for Biological Sciences, Tata Institute of Fundamental Research, Bengaluru 560065, India
| | - Vipin Agarwal
- Tata Institute of Fundamental Research, Sy. No. 36/P, Gopanpally, Hyderabad-500 046, India
| | - Samir K Maji
- Department of Biosciences and Bioengineering, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
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Sharma K, Mehra S, Sawner AS, Markam PS, Panigrahi R, Navalkar A, Chatterjee D, Kumar R, Kadu P, Patel K, Ray S, Kumar A, Maji SK. Effect of Disease-Associated P123H and V70M Mutations on β-Synuclein Fibrillation. ACS Chem Neurosci 2020; 11:2836-2848. [PMID: 32833434 DOI: 10.1021/acschemneuro.0c00405] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Synucleinopathies are a class of neurodegenerative diseases, including Parkinson's disease (PD), Dementia with Lewy bodies (DLB), and Multiple System Atrophy (MSA). The common pathological hallmark of synucleinopathies is the filamentous α-synuclein (α-Syn) aggregates along with membrane components in cytoplasmic inclusions in the brain. β-Synuclein (β-Syn), an isoform of α-Syn, inhibits α-Syn aggregation and prevents its neurotoxicity, suggesting the neuroprotective nature of β-Syn. However, this notion changed with the discovery of disease-associated β-Syn mutations, V70M and P123H, in patients with DLB. It is still unclear how these missense mutations alter the structural and amyloidogenic properties of β-Syn, leading to neurodegeneration. Here, we characterized the biophysical properties and investigated the effect of mutations on β-Syn fibrillation under different conditions. V70M and P123H show high membrane binding affinity compared to wild-type β-Syn, suggesting their potential role in membrane interactions. β-Syn and its mutants do not aggregate under normal physiological conditions; however, the proteins undergo self-polymerization in a slightly acidic microenvironment and/or in the presence of an inducer, forming long unbranched amyloid fibrils similar to α-Syn. Strikingly, V70M and P123H mutants exhibit accelerated fibrillation compared to native β-Syn under these conditions. NMR study further revealed that these point mutations induce local perturbations at the site of mutation in β-Syn. Overall, our data provide insight into the biophysical properties of disease-associated β-Syn mutations and demonstrate that these mutants make the native protein more susceptible to aggregation in an altered microenvironment.
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Affiliation(s)
- Karan Sharma
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Surabhi Mehra
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Ajay S. Sawner
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Pratap S. Markam
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Rajlaxmi Panigrahi
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Ambuja Navalkar
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Debdeep Chatterjee
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Rakesh Kumar
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Pradeep Kadu
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Komal Patel
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Soumik Ray
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Ashutosh Kumar
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
| | - Samir K. Maji
- Department of Biosciences and Bioengineering, IIT Bombay, Powai, Mumbai, India 400076
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