Additional file 4.

IAV binding to bead glycan array. Binding specificity of IAV to sialylated glycoconjugates and mucus was tested on bead-glycan array. Virus binding to the array was quantified by measuring NA activity using 4MU-Neu5Ac-reporter method. Average of three independent experiments, each done in triplicates, is shown. Black line indicates the background. All virus strains bound to HSM. (A) A/PR/8/34(H1N1) showed a preference for Siaα2-3Lactose over Siaα2-6Lactose, did not bind to Neu5Gc containing structures, and showed weak binding to PSM. (B) The pandemic strain A/SD/1/2009(SOIV) exhibited a broad binding specificity, but did not bind PSM. (C) A/Aichi/2/68(H3N2) showed preference for Sia in α2-6 linkages (Siaα2-6Lactose and Sialyl Tn), had weak binding to Neu5Gc containing structures (Neu5Gc and Neu5Gc-SialylTn), and did not bind to PSM.

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Cohen et al. Virology Journal 2013 10:321   doi:10.1186/1743-422X-10-321