Insights into Avian Influenza Virus Pathogenicity: the Hemagglutinin Precursor HA0 of Subtype H16 Has an Alpha-Helix Structure in Its Cleavage Site with Inefficient HA1/HA2 Cleavage.
Lu, X., Shi, Y., Gao, F., Xiao, H., Wang, M., Qi, J., Gao, G.F.(2012) J Virol 86: 12861-12870
- PubMed: 22993148 
- DOI: 10.1128/JVI.01606-12
- Primary Citation of Related Structures:  
4F23, 4FIU - PubMed Abstract: 
With a new serotype (H17) of hemagglutinin (HA) recently being discovered, there are now 17 serotypes (H1 to H17) of influenza A viruses in total. It is believed that HA is initially expressed as a precursor of HA0 and then cleaved into HA1 and HA2, forming a disulfide bond-linked complex, for its full function ...