期刊
NATURE STRUCTURAL & MOLECULAR BIOLOGY
卷 20, 期 3, 页码 363-370出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/nsmb.2500
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资金
- US National Institutes of Health (NIH) [AI058113, R01 AI106002]
- US Department of Defense [HDTRA1-08-10-BRCWMD-BAA]
- NIH [HHSN272200900047C]
- US National Institute of General Medical Sciences (NIGMS) [GM62116]
- US National Cancer Institute [Y1-00-1020]
- NIGMS [Y1-GM-1104]
- US Department of Energy (DOE), Basic Energy Sciences, Office of Science [DE-AC02-06CH11357]
- DOE Office of Biological and Environmental Research
- NIH, NIGMS [P41GM103393]
- National Center for Research Resources (NCRR) [P41RR001209]
Influenza virus hemagglutinin (HA) mediates receptor binding and viral entry during influenza infection. The development of receptor analogs as viral-entry blockers has not been successful, which suggests that sialic acid may not be an ideal scaffold to obtain broad, potent HA inhibitors. Here, we report crystal structures of Fab fragments from three human antibodies that neutralize the 1957 pandemic H2N2 influenza virus in complex with H2 HA. All three antibodies use an aromatic residue to plug a conserved cavity in the HA receptor-binding site. Each antibody interacts with the absolutely conserved HA1 Trp153 at the cavity base through pi-pi stacking with the signature Phe54 of two VH1-69 encoded antibodies or a tyrosine from HCDR3 in the other antibody. This highly conserved interaction can be used as a starting point to design inhibitors targeting this conserved hydrophobic pocket in influenza viruses.
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