C8 lactosyl(β)-ceramide (LacCer), 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) and cholesterol were obtained from Avanti Polar Lipids (Alabaster, AL, USA). Atto 647N 1,2-dioleoyl-sn-glycero-3-phosphoethanolamine (DOPE) was purchased from Sigma-Aldrich (Darmstadt, Germany). Globotriaosylceramide (Gb3) was obtained from Matreya (State College, PA, USA). Shiga toxin B-subunit (StxB) was kindly provided by enGenes Biotech (Vienna, Austria). UDP-Glo Glycosyltransferase assay kit and ultra-pure UDP-Galactose (UDP-Gal) were from Promega (Charbonnières-les-Bain, France). UDP-Gal for QCM-D analysis was purchased from Carbosynth (Compton, UK). HisTrap FF column was purchased from Cytiva (Marlborough, MA, USA) and Superdex 200 Increase 10/300 GL from GE Healthcare (Chicago, MA, USA). All other chemical reagents were of analytical or liquid chromatography grade.
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