The glycan core of GPI-anchored proteins modulates aerolysin binding but is not sufficient: the polypeptide moiety is required for the toxin-receptor interaction

Laurence Abrami, Marie-Claire Velluz, Yeongjin J. Hong, Kazuhito Ohishi, Angela Mehlert, Michael Ferguson, Taroh Kinoshita, F Gisou van der Goot

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    39 Citations (Scopus)

    Abstract

    Sensitivity of mammalian cells to the bacterial toxin aerolysin is due to the presence at their surface of glycosylphosphatidyl inositol (GPI)-anchored proteins which act as receptors. Using a panel of mutants that are affected in the GPI biosynthetic pathway and Trypanosoma brucei variant surface glycoproteins, we show that addition of an ethanolamine phosphate residue on the first mannose of the glycan core does not affect binding. In contrast, the addition of a side chain of up to four galactose residues at position 3 of this same mannose leads to an increase in binding. However, protein free GPIs, which accumulate in mutant cells deficient in the transamidase that transfers the protein to the pre-formed GPI-anchor, were unable to bind the toxin indicating a requirement for the polypeptide moiety, the nature and size of which seem of little importance although two exceptions have been identified. (C) 2002 Federation of European Biochemical Societies. Published by Elsevier Science B.V. All rights reserved.

    Original languageEnglish
    Pages (from-to)249-254
    Number of pages6
    JournalFEBS Letters
    Volume512
    Issue number1-3
    DOIs
    Publication statusPublished - 13 Feb 2002

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