West Nile Virus

West Nile Virus

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Credit: Phil Degginger/SCIENCE PHOTO LIBRARY


Caption: Flaviviruses are a group of human pathogens causing severe encephalitic or haemorrhagic diseases that include West Nile, dengue and yellow fever viruses. Here, using X-ray crystallography we have defined the structure of the flavivirus cross-reactive antibody E53 that engages the highly conserved fusion loop of the West Nile virus envelope glycoprotein. Using cryo-electron microscopy, we also determined that E53 Fab binds preferentially to spikes in noninfectious, immature flavivirions but is unable to bind significantly to mature virions, consistent with the limited solvent exposure of the epitope. We conclude that the neutralizing impact of E53 and likely similar fusion-loop-specific antibodies depends on its binding to the frequently observed immature.

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Keywords: diagram, encephalitic, flaviviruses, haemorrhagic disease, illustration, microbiology, model, molecular, molecular model, molecular structure, pathogen, viral, virus, west nile virus

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