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Human noroviruses (NoVs) are known to recognize histo-blood group antigens (HBGAs) as attachment factors. We report the first experimental evidence that sialic acid-containing glycosphingolipids (gangliosides) are also ligands for human NoVs. Electrospray ionization mass spectrometry-based carbohydrate binding measurements performed on assemblies (P dimer, P particle, and virus-like particle) of recombinant viral capsid proteins of two NoV strains, VA387 (GII.4) and VA115 (GI.3), identified binding to the oligosaccharides of mono-, di-, and trisialylated gangliosides. The intrinsic (per binding site) affinities measured for these ligands are similar in magnitude (10(2)-10(3) M(-1)) to those of human HBGAs. Binding of NoV VLPs, P particles, and glutathione S-transferase (GST)-P domain fusion proteins to sialic acid-containing glycoconjugates, observed in enzyme-linked immunosorbent assays, provided additional confirmation of the NoV-ganglioside interactions.

Gangliosides are Ligands for Human Noroviruses