4HG4

Crystal structure of Fab 2G1 in complex with a H2N2 influenza virus hemagglutinin

Summary for 4HG4

• Entry DOI: 10.2210/pdb4hg4/pdb
• Related: 4HFU
• Descriptor: Hemagglutinin HA1, Hemagglutinin HA2, Fab 2G1 heavy chain, ... (7 entities in total)
• Functional Keywords: viral protein/immune system, viral protein-immune system complex
• Biological source: Influenza A virus; More
• Cellular location: Host apical cell membrane ; Single-pass type I membrane protein . Virion membrane ; Single-pass type I membrane protein : Q67085 Q67085
• Total number of polymer chains: 36
• Total formula weight: 939771.82

Authors

Xu, R.,Wilson, I.A. (deposition date: 2012-10-06, release date: 2013-02-13, Last modification date: 2024-11-06)

Primary citation

Xu, R.,Krause, J.C.,McBride, R.,Paulson, J.C.,Crowe, J.E.,Wilson, I.A.
A recurring motif for antibody recognition of the receptor-binding site of influenza hemagglutinin.
Nat.Struct.Mol.Biol., 20:363-370, 2013

PubMed Abstract: 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 π-π 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.

PubMed: 23396351
DOI: 10.1038/nsmb.2500

Experimental method

X-RAY DIFFRACTION (3.2 Å)