Solid-state NMR characterization of tau in paired helical filaments and bound to microtubules as well as of toxic and non-toxic oligomers of a-synuclein and tau.
Zusammenfassung der Projektergebnisse
In this project we have investigated different pathological states of the proteins α-synuclein and tau, which play a role in Parkinson’s and Alzheimer’s disease, respectively. Using solid-state NMR (ssNMR) spectroscopy we could determine the core regions of paired helical filaments (PHFs) formed by a three-repeat variant of tau and also of α-synuclein (mouse) fibrils. In tau PHFs, three β-strands located all in microtubule-binding repeat three could be identified. For mouse α-synuclein fibrils, we found that the rigid core structure comprises six β-strands located between residues G41 and V95. In both cases we could determine the supramolecular arrangement to be a parallel, in-register β-sheet structure. This latter aspect also involved the application of tailored methods to study supramolecular arrangements. Additionally, we then applied these methods that we had originally developed for amyloid fibrils to the study of a functional supramolecular assembly, the type three secretion system (T3SS) needle. This molecular machine is used by pathogenic bacteria to inject virulence factors into host cells. Using our new methods we could determine an atomic model of the T3SS needle whose structure was unknown before (see also the press release of the Max Planck Society: http://www.mpibpc.mpg.de/590161/news_publication_5801544). Subsequently we have presented a refined structure of the type III secretion needle on the basis of solid-state NMR data and a 7.7-Å cryo-EM density map. This collaborative work has also led to the development of a new hybrid structural determination approach which integrates ssNMR and cryo-EM data. We have also investigated a variety of oligomeric species of α-synuclein. On the one hand we studied on-pathway toxic pore-forming oligomers obtained by colddissociation of amyloid fibrils. On the other hand we studied off-pathway oligomers induced by the presence of small aggregation-inhibiting compounds. Lastly, we have installed a dynamic nuclear polarization setup at the Max Planck Institute for Biophysical Chemistry, Göttingen that allows to enhance the ssNMR sensitivity dramatically (14.1 T wide-bore spectrometer; first test measurements yielded an enhancement factor ~30 for type iii secretion needles). This setup will be available for future work on tau-microtubule interactions.
Projektbezogene Publikationen (Auswahl)
- Structural properties of pore-forming oligomers of α-synuclein, Journal of the American Chemical Society, 131 (2009), pp. 17482-17489
H. Y. Kim, M. K. Cho, A. Kumar, E. Maier, C. Siebenhaar, S. Becker, C. O. Fernandez, H. A. Lashuel, R. Benz, A. Lange, and M. Zweckstetter
- Supramolecular interactions probed by 13C-13C solid-state NMR spectroscopy, Journal of the American Chemical Society, 132 (2010), pp. 15164-15166
A. Loquet, K. Giller, S. Becker, and A. Lange
- 13C spin dilution for simplified and complete solid-state NMR resonance assignment of insoluble biological assemblies, Journal of the American Chemical Society, 133 (2011), pp. 4722-4725
A. Loquet, G. Lv, K. Giller, S. Becker, and A. Lange
- Atomic model of the type III secretion system needle, Nature, 486 (2012), pp. 276-279
A. Loquet, N. G. Sgourakis, R. Gupta, K. Giller, D. Riedel, C. Goosmann, C. Griesinger, M. Kolbe, D. Baker, S. Becker, and A. Lange
(Siehe online unter https://doi.org/10.1038/nature11079) - Structural comparison of mouse and human α-synuclein amyloid fibrils by solid-state NMR, Journal of Molecular Biology, 420 (2012), pp. 99-111
G. Lv, A. Kumar, K. Giller, M. L. Orcellet, D. Riedel, C. O. Fernández, S. Becker, and A. Lange
(Siehe online unter https://doi.org/10.1016/j.jmb.2012.04.009) - β-sheet core of tau paired helical filaments revealed by solid-state NMR, Journal of the American Chemical Society, 134 (2012), pp. 13982-13989
V. Daebel, S. Chinnathambi, J. Biernat, M. Schwalbe, B. Habenstein, A. Loquet, E. Akoury, K. Tepper, H. Müller, M. Baldus, C. Griesinger, M. Zweckstetter, E. Mandelkow, V. Vijayan, and A. Lange
(Siehe online unter https://doi.org/10.1021/ja305470p) - Atomic structure and handedness of the building block of a biological assembly, Journal of the American Chemical Society, 135 (2013), pp. 19135-19138
A. Loquet, B. Habenstein, V. Chevelkov, S. K. Vasa, K. Giller, S. Becker, and A. Lange
(Siehe online unter https://doi.org/10.1021/ja411362q) - The common structural architecture of Shigella flexneri and Salmonella typhimurium type three secretion needles, PLOS Pathogens, 9 (2013), e1003245
J.-P. Demers, N. G. Sgourakis, R. Gupta, A. Loquet, K. Giller, D. Riedel, B. Laube, M. Kolbe, D. Baker, S. Becker, and A. Lange
(Siehe online unter https://doi.org/10.1371/journal.ppat.1003245) - High-resolution structure of the Shigella type-III secretion needle by solid-state NMR and cryo-electron microscopy, Nature Communications, 5 (2014), 4976
J.-P. Demers, B. Habenstein, A. Loquet, S. K. Vasa, K. Giller, S. Becker, D. Baker, A. Lange, and N. G. Sgourakis
(Siehe online unter https://doi.org/10.1038/ncomms5976) - Studies on the MxiH protein in T3SS needles using DNP-enhanced ssNMR spectroscopy, ChemPhysChem, 15 (2014), pp. 57-60
P. Fricke, J.-P. Demers, S. Becker, and A. Lange
(Siehe online unter https://doi.org/10.1002/cphc.201300994)
