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A Sulfonozanamivir Analogue Has Potent Anti-influenza Virus Activity.
ChemMedChem 2018 April 24
Influenza virus infection continues to cause significant, often severe, respiratory illness worldwide. A validated target for the development of anti-influenza agents is the virus surface protein sialidase. In the current study, we have discovered a highly potent inhibitor of influenza virus sialidase, based on a novel sialosyl sulfonate template. The synthesised 3-guanidino sialosyl α-sulfonate, a sulfonozanamivir analogue, inhibits viral replication in vitro at the nanomolar level, comparable to that of the anti-influenza drug zanamivir. Using protein X-ray crystallography we show that the sialosyl α-sulfonate template binds within the sialidase active site in a 1 C4 chair conformation. The C1-sulfonate moiety forms crucial and strong-binding interactions with the active site's triarginyl cluster, while the 3-guanidino moiety interacts significantly with conserved active site residues. This sulfonozanamivir analogue provides a new direction in anti-influenza virus drug development.
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