Shotgun glycomics of pig lung identifies natural endogenous receptors for influenza viruses

Significance Studies using novel “shotgun glycan microarray” technology identify, for the first time to our knowledge, the endogenous receptors for influenza viruses from a natural host, the pig. Libraries of total N-glycans from pig lung were probed for binding properties using a panel of influenza viruses isolated from humans, birds, and swine. Natural glycan receptors were identified for all viruses examined, and although some displayed the rather broad α2,3 or α2,6 sialic acid linkage specificity conventionally associated with avian or human viruses, other strains were highly specific, revealing a complexity that has not been demonstrated previously. Because pigs are often implicated as intermediate hosts for pandemic viruses, these results and the approaches described will transform our understanding of influenza host range, transmission, and pathogenicity. Influenza viruses bind to host cell surface glycans containing terminal sialic acids, but as studies on influenza binding become more sophisticated, it is becoming evident that although sialic acid may be necessary, it is not sufficient for productive binding. To better define endogenous glycans that serve as viral receptors, we have explored glycan recognition in the pig lung, because influenza is broadly disseminated in swine, and swine have been postulated as an intermediary host for the emergence of pandemic strains. For these studies, we used the technology of “shotgun glycomics” to identify natural receptor glycans. The total released N- and O-glycans from pig lung glycoproteins and glycolipid-derived glycans were fluorescently tagged and separated by multidimensional HPLC, and individual glycans were covalently printed to generate pig lung shotgun glycan microarrays. All viruses tested interacted with one or more sialylated N-glycans but not O-glycans or glycolipid-derived glycans, and each virus demonstrated novel and unexpected differences in endogenous N-glycan recognition. The results illustrate the repertoire of specific, endogenous N-glycans of pig lung glycoproteins for virus recognition and offer a new direction for studying endogenous glycan functions in viral pathogenesis.

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