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  • Sialic acid recognition by Vibrio cholerae neuraminidase

    Author
    Moustafa, Ibrahim
    Connaris, Helen
    Taylor, Margaret
    Zaitsev, Viateslav
    Wilson, Jenny
    Kiefel, Milton
    von Itzstein, Mark
    Taylor, Garry
    Year published
    2004
    Metadata
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    Abstract
    Vibrio cholerae neuraminidase (VCNA) plays a significant role in the pathogenesis of cholera by removing sialic acid from higher order gangliosides to unmask GM1, the receptor for cholera toxin. We previously showed that the structure of VCNA is composed of a central ?-propeller catalytic domain flanked by two lectin-like domains, however the nature of the carbohydrates recognised by these lectin domains has remained unknown. We present here structures of the enzyme in complex with two substrates, ?2,3-sialyllactose and ?-2,6-sialyllactose. Both substrate complexes reveal the ?-anomer of N-acetylneuraminic acid (Neu5Ac, NANA) ...
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    Vibrio cholerae neuraminidase (VCNA) plays a significant role in the pathogenesis of cholera by removing sialic acid from higher order gangliosides to unmask GM1, the receptor for cholera toxin. We previously showed that the structure of VCNA is composed of a central ?-propeller catalytic domain flanked by two lectin-like domains, however the nature of the carbohydrates recognised by these lectin domains has remained unknown. We present here structures of the enzyme in complex with two substrates, ?2,3-sialyllactose and ?-2,6-sialyllactose. Both substrate complexes reveal the ?-anomer of N-acetylneuraminic acid (Neu5Ac, NANA) bound to the Nterminal lectin domain, thereby revealing the role of this domain. The large number of interactions suggest a relatively high binding affinity for sialic acid, which was confirmed by calorimetry, which gave a Kd~30?M. Saturation transfer difference (STD) NMR using a non-hydrolysable substrate, Neu5,9Ac2-2-S-(?-2,6)-GlcNAc?1Me, was also used to map the ligand interactions at the VCNA lectin binding site. It is well known that VCNA can hydrolyse both ?-2,3- and ?-2,6-linked sialic acid substrates. In this study using ?-2,3-sialyllactose co-crystallised with VCNA it was revealed that the inhibitor 2-deoxy-2,3-didehydro-N-acetylneuraminic acid (Neu5Ac2en, DANA) was bound at the catalytic site. This observation supports the notion that VCNA can produce its own inhibitor and has been further confirmed by 1H NMR analysis. The discovery of the sialic acid-binding site in the N-lectin-like domain suggests that this might help target VCNA to sialic acid-rich environments, thereby enhancing the catalytic efficiency of the enzyme.
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    Journal Title
    Journal of Biological Chemistry
    Volume
    279
    Issue
    39
    Publisher URI
    http://www.jbc.org/
    DOI
    https://doi.org/10.1074/jbc.M404965200
    Copyright Statement
    © 2004 American Society for Biochemistry and Molecular Biology. Please refer to the journal website for access to the definitive, published version.
    Subject
    HISTORY AND ARCHAEOLOGY
    Publication URI
    http://hdl.handle.net/10072/5050
    Collection
    • Journal articles

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