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    Structural analysis of prion proteins by means of drift cell and traveling wave ion mobility mass spectrometry

    Hilton, G.R. and Thalassinos, Konstantinos and Grabenauer, M. and Sanghera, N. and Slade, S.E. and Wyttenbach, T. and Robinson, P.J. and Pinheiro, T.J.T. and Bowers, M.T. and Scrivens, J.H. (2010) Structural analysis of prion proteins by means of drift cell and traveling wave ion mobility mass spectrometry. Journal of The American Society for Mass Spectrometry 21 (5), pp. 845-854. ISSN 1044-0305.

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    Abstract

    The prion protein (PrP) is implicitly involved in the pathogenesis of transmissible spongiform encephalopathies (TSEs). The conversion of normal cellular PrP (PrPC), a protein that is predominantly α-helical, to a β-sheet-rich isoform (PrPSc), which has a propensity to aggregate, is the key molecular event in prion diseases. During its short life span, PrP can experience two different pH environments; a mildly acidic environment, whilst cycling within the cell, and a neutral pH when it is glycosyl phosphatidylinositol (GPI)-anchored to the cell membrane. Ion mobility (IM) combined with mass spectrometry has been employed to differentiate between two conformational isoforms of recombinant Syrian hamster prion protein (SHaPrP). The recombinant proteins studied were α-helical SHaPrP(90-231) and β-sheet-rich SHaPrP(90-231) at pH 5.5 and pH 7.0. The recombinant proteins have the same nominal mass-to-charge ratio (m/z) but differ in their secondary and tertiary structures. A comparison of traveling-wave (T-Wave) ion mobility and drift cell ion mobility (DCIM) mass spectrometry estimated and absolute cross-sections showed an excellent agreement between the two techniques. The use of T-Wave ion mobility as a shape-selective separation technique enabled differentiation between the estimated cross-sections and arrival time distributions (ATDs) of α-helical SHaPrP(90-231) and β-sheet-rich SHaPrP(90-231) at pH 5.5. No differences in cross-section or ATD profiles were observed between the protein isoforms at pH 7.0. The findings have potential implications for a new ante-mortem screening assay, in bodily fluids, for prion misfolding diseases such as TSEs.

    Metadata

    Item Type: Article
    School: School of Science > Biological Sciences
    Research Centres and Institutes: Structural Molecular Biology, Institute of (ISMB)
    Depositing User: Administrator
    Date Deposited: 20 May 2013 11:41
    Last Modified: 06 Dec 2016 10:40
    URI: https://eprints.bbk.ac.uk/id/eprint/6895

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