Structural basis for a human broadly neutralizing influenza A hemagglutinin stem-specific antibody including H17/18 subtypes

Yulu Chen, Fei Wang, Liwei Yin, Haihai Jiang, Xishan Lu, Yuhai Bi, Wei Zhang, Yi Shi, Roberto Burioni, Zhou Tong, Hao Song, Jianxun Qi () and George F. Gao ()
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Yulu Chen: Chinese Academy of Sciences
Fei Wang: Chinese Academy of Sciences
Liwei Yin: Chinese Academy of Sciences
Haihai Jiang: Chinese Academy of Sciences
Xishan Lu: Chinese Academy of Sciences
Yuhai Bi: Chinese Academy of Sciences
Wei Zhang: Chinese Academy of Sciences
Yi Shi: Chinese Academy of Sciences
Roberto Burioni: Università Vita-Salute San Raffaele
Zhou Tong: Chinese Academy of Sciences
Hao Song: University of Chinese Academy of Sciences
Jianxun Qi: Chinese Academy of Sciences
George F. Gao: Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-13

Abstract: Abstract Influenza infection continues are a persistent threat to public health. The identification and characterization of human broadly neutralizing antibodies can facilitate the development of antibody drugs and the design of universal influenza vaccines. Here, we present structural information for the human antibody PN-SIA28’s heterosubtypic binding of hemagglutinin (HA) from circulating and emerging potential influenza A viruses (IAVs). Aside from group 1 and 2 conventional IAV HAs, PN-SIA28 also inhibits membrane fusion mediated by bat-origin H17 and H18 HAs. Crystallographic analyses of Fab alone or in complex with H1, H14, and H18 HA proteins reveal that PN-SIA28 binds to a highly conserved epitope in the fusion domain of different HAs, with the same CDRHs but different CDRLs for different HAs tested, distinguishing it from other structurally characterized anti-stem antibodies. The binding characteristics of PN-SIA28 provides information to support the design of increasingly potent engineered antibodies, antiviral drugs, and/or universal influenza vaccines.

Date: 2022
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DOI: 10.1038/s41467-022-35236-y

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