Abstract
The self-propagation of misfolded conformations of tau underlies neurodegenerative diseases, including Alzheimer's. There is considerable interest in discovering the minimal sequence and active conformational nucleus that defines this self-propagating event. The microtubule-binding region, spanning residues 244–372, reproduces much of the aggregation behaviour of tau in cells and animal models. Further dissection of the amyloid-forming region to a hexapeptide from the third microtubule-binding repeat resulted in a peptide that rapidly forms fibrils in vitro. We show that this peptide lacks the ability to seed aggregation of tau244–372 in cells. However, as the hexapeptide is gradually extended to 31 residues, the peptides aggregate more slowly and gain potent activity to induce aggregation of tau244–372 in cells. X-ray fibre diffraction, hydrogen–deuterium exchange and solid-state NMR studies map the beta-forming region to a 25-residue sequence. Thus, the nucleus for self-propagating aggregation of tau244–372 in cells is packaged in a remarkably small peptide.
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Acknowledgements
J.S., W.F.D., H.W., M.N. and S.B.P. are supported by grants from the National Institutes of Health (AG002132, AG031220, GM054616 and HL007731). J.S. and M.N. were supported by an award from the Glenn Foundation. J.S. is a recipient of the New Investigator Research Grant (2015-NIRG-339935) from the Alzheimer's Association. F.G. and J.R. are supported by a grant from the National Institutes of Health (GM104605). This work was also supported in part by the UCSF Research Resource Program Shared Equipment Award funded by the UCSF Office of Research, Daiichi Sankyo, the Henry M. Jackson Foundation, the Sherman Fairchild Foundation, and by a gift from the Rainwater Charitable Foundation.
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J.S., W.F.D. and S.B.P. conceived and designed the experiments; J.S., M.N., H.W., M.B., C.C., N.J., J.R., T.L., S.A., J.B., M.J.S.K. and K.R. performed the experiments; J.S., M.N., H.W.Y.W., M.B. and C.C analysed data; J.S., W.F.D. and S.B.P. co-wrote the paper; J.S., M.N. and H.W. contributed equally to this work.
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UCSF is conducting research sponsored by Daiichi Sankyo (Tokyo, Japan) to develop diagnostics and therapeutics for tau. Currently, there is no direct relationship between these agreements and this Article.
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Stöhr, J., Wu, H., Nick, M. et al. A 31-residue peptide induces aggregation of tau's microtubule-binding region in cells. Nature Chem 9, 874–881 (2017). https://doi.org/10.1038/nchem.2754
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DOI: https://doi.org/10.1038/nchem.2754