Three Long-Range Distance Constraints and an Approach Towards a Model for the α-Synuclein-Fibril Fold

Autor: Vinod Subramaniam, Bart D. van Rooijen, Mireille M.A.E. Claessens, Ine M.J. Segers-Nolten, Martina Huber, Pravin Kumar, Maryam Hashemi Shabestari
Přispěvatelé: Nanobiophysics, Executive board Vrije Universiteit
Jazyk: angličtina
Rok vydání: 2015
Předmět:
Zdroj: Applied Magnetic Resonance, 46(4), 369-388. Springer
Hashemi Shabestari, M, Kumar, P, Segers-Nolten, I M J, Claessens, M M A E, van Rooijen, B D, Subramaniam, V & Huber, M 2015, ' Three Long-Range Distance Constraints and an Approach Towards a Model for the α-Synuclein-Fibril Fold ', Applied Magnetic Resonance, vol. 46, no. 4, pp. 369-388 . https://doi.org/10.1007/s00723-014-0622-7
Applied Magnetic Resonance, 46(4), 369-388. Springer Verlag
ISSN: 0937-9347
DOI: 10.1007/s00723-014-0622-7
Popis: Amyloid fibrils and plaques are the hallmark of neurodegenerative diseases. In Parkinson’s disease, plaques (Lewy bodies) consist predominantly of the α-synuclein (αS) protein. To understand aggregation, the molecular architecture of αS fibrils needs to be known. Here, we determine nm-distance constraints for the protein in the fibril by double electron–electron paramagnetic resonance (DEER) on doubly spin-labeled αS variants, diamagnetically diluted with wild-type αS to suppress intermolecular interactions. Intramolecular distances in three pairs (56/69, 56/90 and 69/90) are reported. An approach to derive a model for the fibril fold from sparse distance data assuming only parallel β-sheets is described. Using the distances obtained in this study as input, a model is obtained with three strands, comprising residues 56–90, in which the strands consist of 8–12 residues each. Limitations of the approach are discussed in detail, showing that the interpretation of the data does not yet yield an unambiguous structure model. Possible avenues to improve this situation are described.
Databáze: OpenAIRE
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