A protective human monoclonal antibody targeting the West Nile virus E protein preferentially recognizes mature virions
NATURE MICROBIOLOGY(2018)
摘要
West Nile virus (WNV), a member of the Flavivirus genus, is a leading cause of viral encephalitis in the United States 1 . The development of neutralizing antibodies against the flavivirus envelope (E) protein is critical for immunity and vaccine protection 2 . Previously identified candidate therapeutic mouse and human neutralizing monoclonal antibodies (mAbs) target epitopes within the E domain III lateral ridge and the domain I-II hinge region, respectively 3 . To explore the neutralizing antibody repertoire elicited by WNV infection for potential therapeutic application, we isolated ten mAbs from WNV-infected individuals. mAb WNV-86 neutralized WNV with a 50% inhibitory concentration of 2 ng ml -1 , one of the most potently neutralizing flavivirus-specific antibodies ever isolated. WNV-86 targets an epitope in E domain II, and preferentially recognizes mature virions lacking an uncleaved form of the chaperone protein prM, unlike most flavivirus-specific antibodies 4 . In vitro selection experiments revealed a neutralization escape mechanism involving a glycan addition to E domain II. Finally, a single dose of WNV-86 administered two days post-infection protected mice from lethal WNV challenge. This study identifies a highly potent human neutralizing mAb with therapeutic potential that targets an epitope preferentially displayed on mature virions.
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关键词
Viral infection,West nile virus,Life Sciences,general,Microbiology,Medical Microbiology,Parasitology,Infectious Diseases,Virology
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