[Accessing the features of surface neuraminidase (N1) of influenza A virus presenting on the platforms for anti-NA Abs screening].

Objective: To understand if the Neuraminidase (N1) of Influenza A virus at the surface of yeast-displaying system, eukaryotic expression system and the infected cells could be used for anti-NA Abs screening, their activities and bindings to five candidate Abs were assayed.

Methods: The surface NA expression was obtained by transfecting by recombinant NA constructors with specific tag-labels or live virus infection. The functional activity was measured by the fluorescent assay. Their bindings to the Abs were detected by flow cytometry.

Results: The surface NAs presenting on the yeast-displaying system and eukaryotic expression system exhibited functional NA activities as the NA at the surface of virus-infected cells which showed affinities to Ab1, 4, and 5. The same bindings to Abl and 5 were found in the surface NA expressed by eukaryotic expression system while minor binding was observed in the yeast displayed-NA.

Conclusion: The epitopes of yeast-displayed NA may be different from the NAs present at eukaryotic expression system and the infected cells which more likely suitable for the screening of anti-NA Abs.