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    Michler’s Hydrol Blue: A Sensitive Probe for Amyloid Fibril Detection

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    Type
    Article
    Authors
    Kitts, Catherine C.
    Beke-Somfai, Tamás
    Nordén, Bengt
    KAUST Grant Number
    KUK-11-008-23
    Date
    2011-05-03
    Permanent link to this record
    http://hdl.handle.net/10754/598821
    
    Metadata
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    Abstract
    Michler's hydrol blue (MHB) is investigated with respect to photophysical properties in varied solvent environment and when bound to insulin and lysozyme fibrils. The MHB chromophore is shown to act like a molecular rotor and bind well to amyloid fibrils, where it exhibits a characteristic red-shift in its excitation spectrum and an increase in the emission quantum yield upon binding. MHB is more sensitive to environmental changes than Thioflavin T (ThT) and furthermore, in contrast to the latter amyloid probe, can differentiate between insulin and lysozyme fibrils by a more red-shifted excitation spectrum for insulin fibrils. To support the experimental observations, time-dependent density functional theory (TDDFT) calculations were performed on MHB at several levels of theory. The predicted changes of spectral properties as a function of the environment are in good agreement with the experimental results. Linear dichroism (LD) is used to determine the orientation of the MHB within the fibrils. It was shown through LD and molecular modeling that MHB aligns itself preferentially parallel with the amyloid fiber at an angle of 14°-22° to the fibril axis and along the grooves of the β-sheet. © 2011 American Chemical Society.
    Citation
    Kitts CC, Beke-Somfai T, Nordén B (2011) Michler’s Hydrol Blue: A Sensitive Probe for Amyloid Fibril Detection. Biochemistry 50: 3451–3461. Available: http://dx.doi.org/10.1021/bi102016p.
    Sponsors
    B.N. was supported by grants from KAUST. C.C.K. and T.B-S. both. hold a KAUST postdoctoral fellowship.King Abdullah University of Science and Technology (KAUST) (Grant KUK-11-008-23) is gratefully acknowledged. Special thanks to Johan Johansson for assessing the purity of the Michler's hydrol blue sample used in these experiments and to Maria Abrahamsson for help collecting the fluorescence lifetime data. We also thank Per Lincoln for stimulating discussions.
    Publisher
    American Chemical Society (ACS)
    Journal
    Biochemistry
    ISSN
    0006-2960
    1520-4995
    DOI
    10.1021/bi102016p
    PubMed ID
    21480580
    ae974a485f413a2113503eed53cd6c53
    10.1021/bi102016p
    Scopus Count
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