Abstract
Structural investigation of intermediately formed oligomers and pre-fibrillar species is of tremendous importance in order to elucidate the structural principles of fibrillation, and because intermediate species have been suggested as the pathogenic agents in several amyloid diseases. Structural investigations are however greatly complicated by the dynamic changes between structural states of very different sizes and life-times. Small angle X-ray scattering (SAXS) is an ideal method to handle this challenge. The method provides information about the fibrillation process (number of species present and their volume fractions) and low-resolution 3-dimensional structural models of individual species, notably also of the intermediately formed, in-process species from undisturbed fibrillation equilibria. Here, we provide a detailed description of the methods used for the measurement and analysis of SAXS data from fibrillating samples, exemplified using data from our own research.
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Acknowledgments
The experiences gathered in this chapter were not collected overnight, thus we would like to thank our colleagues and collaborators for significant discussions and help. In particular, we thank current and former members of the BioSAXS group at the University of Copenhagen. From EMBL-Hamburg, we warmly thank Dmitri I. Svergun and several members of his group for highly valuable help throughout this long scientific journey. It is mentioned in particular that the strong commitment of beamline staff is a crucial aspect during this kind of experiments. We greatly acknowledge plenty beamtime at beamlines X33 and P12 (EMBL-Hamburg), without which the development of the methodology described here would not have been possible. We also appreciate funding from The Lundbeck Foundation, the Novo Nordisk Foundation, the Danish Research Council for Health and Disease, and DANSCATT (A.E.L and B.V). This work was additionally supported by SPIN-HD—Chaires d’execellence 2011 from the Agence National de la Recherche, ATIP-Avenir and the French Infrastructure for Integrated Structural Biology (FRISBI—ANR-10-INSB-05-01) to P.B.
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Langkilde, A.E., Herranz-Trillo, F., Bernadó, P., Vestergaard, B. (2018). Noninvasive Structural Analysis of Intermediate Species During Fibrillation: An Application of Small-Angle X-Ray Scattering. In: Sigurdsson, E., Calero, M., Gasset, M. (eds) Amyloid Proteins. Methods in Molecular Biology, vol 1779. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-7816-8_14
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DOI: https://doi.org/10.1007/978-1-4939-7816-8_14
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