4kvn | pdb_00004kvn
Crystal structure of Fab 39.29 in complex with Influenza Hemagglutinin A/Perth/16/2009 (H3N2)
Structural highlights
FunctionC6KNH7_9INFA Binds to sialic acid-containing receptors on the cell surface, bringing about the attachment of the virus particle to the cell. This attachment induces virion internalization of about two third of the virus particles through clathrin-dependent endocytosis and about one third through a clathrin- and caveolin-independent pathway. Plays a major role in the determination of host range restriction and virulence. Class I viral fusion protein. Responsible for penetration of the virus into the cell cytoplasm by mediating the fusion of the membrane of the endocytosed virus particle with the endosomal membrane. Low pH in endosomes induces an irreversible conformational change in HA2, releasing the fusion hydrophobic peptide. Several trimers are required to form a competent fusion pore (By similarity).[RuleBase:RU003324][SAAS:SAAS001364_004_327643] Publication Abstract from PubMedRecent advances enabling the cloning of human immunoglobulin G genes have proven effective for discovering monoclonal antibodies with therapeutic potential. However, these antibody-discovery methods are often arduous and identify only a few candidates from numerous antibody-secreting plasma cells or plasmablasts. We describe an in vivo enrichment technique that identifies broadly neutralizing human antibodies with high frequency. For this technique, human peripheral blood mononuclear cells from vaccinated donors are activated and enriched in an antigen-specific manner for the production of numerous antigen-specific plasmablasts. Using this technology, we identified four broadly neutralizing influenza A antibodies by screening only 840 human antibodies. Two of these antibodies neutralize every influenza A human isolate tested and perform better than the current anti-influenza A therapeutic, oseltamivir, in treating severe influenza infection in mice and ferrets. Furthermore, these antibodies elicit robust in vivo synergism when combined with oseltamivir, thus highlighting treatment strategies that could benefit influenza-infected patients. An in vivo human-plasmablast enrichment technique allows rapid identification of therapeutic influenza a antibodies.,Nakamura G, Chai N, Park S, Chiang N, Lin Z, Chiu H, Fong R, Yan D, Kim J, Zhang J, Lee WP, Estevez A, Coons M, Xu M, Lupardus P, Balazs M, Swem LR Cell Host Microbe. 2013 Jul 17;14(1):93-103. doi: 10.1016/j.chom.2013.06.004. PMID:23870317[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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