National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)
75N93019C00051
米国
引用
ジャーナル: bioRxiv / 年: 2025 タイトル: Characterization of the glycoproteins of novel fish influenza B-like viruses. 著者: Gagandeep Singh / Jiachen Huang / Disha Bhavsar / Kirill Vasilev / James A Ferguson / Geert-Jan Boons / Viviana Simon / Robert P de Vries / Julianna Han / Andrew Ward / Florian Krammer / 要旨: Novel influenza-like virus sequences previously identified in fish and amphibians were found to cluster as a sister clade of influenza B viruses, but have thus far remained uncharacterized. We ...Novel influenza-like virus sequences previously identified in fish and amphibians were found to cluster as a sister clade of influenza B viruses, but have thus far remained uncharacterized. We demonstrate that salamander influenza-like virus (SILV) HA is functionally divergent from influenza B virus HA and does not bind to α 2,3- and α2,6-linked sialic acids. However, the HAs of Siamese algae-eater influenza-like virus (SAEILV) and chum salmon influenza-like virus (CSILV) bind to α2,3 linked sialic acid. Furthermore, SAEILV HA binds to sialyated Lewis X, is activated by human airway enzymes and is fusogenic at a wide range of pH conditions. SAEILV NA has a highly conserved active site and a similar structure to other known NAs. We also determined the cryo-electron microscopy structure of the HA of a previously described virus from the same sister clade, the Wuhan spiny eel influenza virus (WSEIV). Importantly, no cross-reactive antibodies against these HAs or NAs were found in the human serum, suggesting that humans are immunologically naïve to these viruses.