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Lu, Xishan; Xiao, Haixia; Li, Shihua; Pang, Xuefei; Song, Jian; Liu, Sheng; Cheng, Huijun; Li, Yan; Wang, Xiangxi; Huang, Chaobin; Guo, Tianling; ter Meulen, Jan; Daffis, Stephane; Yan, Jinghua; Dai, Lianpan; Rao, Zihe; Klenk, Hans-Dieter; Qi, Jianxun; Shi, Yi; Gao, George F.
Cell reports (Cambridge), 01/2019, Volume: 26, Issue: 2Journal Article
Yellow fever virus (YFV), a deadly human pathogen, is the prototype of the genus Flavivirus. Recently, YFV re-emerged in Africa and Brazil, leading to hundreds of deaths, with some cases imported to China. Prophylactic or therapeutic countermeasures are urgently needed. Previously, several human monoclonal antibodies against YFV were screened out by phage display. Here, we find that one of them, 5A, exhibits high neutralizing potency and good protection. Crystallographic analysis of the YFV envelope (E) protein in its pre- and post-fusion states shows conformations similar to those observed in other E proteins of flaviviruses. Furthermore, the structures of 5A in complex with the E protein in both states are resolved, revealing an invariant recognition site. Structural analysis and functional data suggest that 5A has high neutralization potency because it interferes with virus entry by preventing both virus attachment and fusion. These findings will be instrumental for immunogen or inhibitor design. Display omitted •The crystal structures of YFV-E in both pre- and post-fusion states are determined•A neutralizing monoclonal antibody engages YFV-E in both states as a double lock•This monoclonal antibody inhibits YFV infection at multiple steps of virus entry Yellow fever virus (YFV) is a deadly flavivirus. Lu et al. report the structures of YFV envelope protein in its pre- and post-fusion states and a potent neutralizing monoclonal antibody bound to both states. Structural and functional analyses reveal the double lock of the antibody to neutralize YFV infection.
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