Receptor mimicry by antibody F045-092 facilitates universal binding to the H3 subtype of influenza virus.Lee, P.S., Ohshima, N., Stanfield, R.L., Yu, W., Iba, Y., Okuno, Y., Kurosawa, Y., Wilson, I.A.
(2014) Nat Commun 5: 3614-3614
- PubMed: 24717798
- DOI: https://doi.org/10.1038/ncomms4614
- Primary Citation of Related Structures:
4O58, 4O5I, 4O5L, 4O5N
- PubMed Abstract:
Influenza viruses present a significant health challenge each year, as in the H3N2 epidemic of 2012-2013. Here we describe an antibody, F045-092, that possesses broadly neutralizing activity against the entire H3 subtype and accommodates the natural variation and additional glycosylation in all strains tested from 1963 to 2011. Crystal structures of F045-092 in complex with HAs from 1975 and 2011 H3N2 viruses reveal the structural basis for its neutralization breadth through insertion of its 23-residue HCDR3 into the receptor-binding site that involves striking receptor mimicry. F045-092 extends its recognition to divergent subtypes, including H1, H2 and H13, using the enhanced avidity of its IgG to overcome lower-affinity Fab binding, as observed with other antibodies that target the receptor-binding site. This unprecedented level of antibody cross-reactivity against the H3 subtype can potentially inform on development of a pan-H3 vaccine or small-molecule therapeutics.
Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, California 92037, USA.