Neutralization of West Nile virus by cross-linking of its surface proteins with Fab fragments of the human monoclonal antibody CR4354

Bärbel Kaufmann, Matthew R. Vogt, Jaap Goudsmit, Heather A. Holdaway, Anastasia A. Aksyuk, Paul R. Chipman, Richard J. Kuhn, Michael S. Diamond, Michael G. Rossmann

Research output: Contribution to journalArticle

97 Scopus citations

Abstract

Many flaviviruses are significant human pathogens, with the humoral immune response playing an essential role in restricting infection and disease. CR4354, a human monoclonal antibody isolated froma patient, neutralizesWest Nile virus (WNV) infection at a postattachment stage in the viral life-cycle. Here, we determined the structure of WNV complexed with Fab fragments of CR4354 using cryoelectron microscopy. The outer glycoprotein shell of a mature WNV particle is formed by 30 rafts of three homodimers of the viral surface protein E. CR4354 binds to a discontinuous epitope formed by protein segments from two neighboring E molecules, but does not cause any detectable structural disturbance on the viral surface. The epitope occurs at two independent positions within an icosahedral asymmetric unit, resulting in 120 binding sites on the viral surface. The cross-linking of the six E monomers within one raft by four CR4354 Fab fragments suggests that the antibody neutralizes WNV by blocking the pH-induced rearrangement of the E protein required for virus fusion with the endosomal membrane.

Original languageEnglish
Pages (from-to)18950-18955
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume107
Issue number44
DOIs
StatePublished - Nov 2 2010

Keywords

  • Antibody
  • Cryoelectron microscopy
  • Flavivirus

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