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Influenza virus binds its host cell using multiple dynamic interactions
Christian Sieben, Christian Kappel, Rong Zhu, Anna Wozniak, Christian Rankl, Peter Hinterdorfer, Helmut Grubmüller and Andreas Herrmann
Proceedings of the National Academy of Sciences of the United States of America
Vol. 109, No. 34 (August 21, 2012), pp. 13626-13631
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/41700982
Page Count: 6
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Influenza virus belongs to a wide range of enveloped viruses. The major spike protein hemagglutinin binds sialic acid residues of glycoproteins and glycolipids with dissociation constants in the millimolar range [Sauter NK, et al. (1992) Biochemistry 31:9609-9621], indicating a multivalent binding mode. Here, we characterized the attachment of influenza virus to host cell receptors using three independent approaches. Optical tweezers and atomic force microscopy-based single-molecule force spectroscopy revealed very low interaction forces. Further, the observation of sequential unbinding events strongly suggests a multivalent binding mode between virus and cell membrane. Molecular dynamics simulations reveal a variety of unbinding pathways that indicate a highly dynamic interaction between HA and its receptor, allowing rationalization of influenza virus-cell binding quantitatively at the molecular level.
Proceedings of the National Academy of Sciences of the United States of America © 2012 National Academy of Sciences