4XKG

Crystal structure of hemagglutinin from Taiwan (2013) H6N1 influenza virus in complex with 6'-SLN

Summary for 4XKG

• Entry DOI: 10.2210/pdb4xkg/pdb
• Related: 4XKD 4XKE 4XKF
• Descriptor: Hemagglutinin HA1 chain, Hemagglutinin HA2 chain, 2-acetamido-2-deoxy-beta-D-glucopyranose, ... (6 entities in total)
• Functional Keywords: viral protein
• Biological source: Influenza A virus; More
• Total number of polymer chains: 6
• Total formula weight: 175705.71

Authors

Tzarum, N.,Zhu, X.,Wilson, I.A. (deposition date: 2015-01-11, release date: 2015-04-01, Last modification date: 2024-11-06)

Primary citation

Tzarum, N.,de Vries, R.P.,Zhu, X.,Yu, W.,McBride, R.,Paulson, J.C.,Wilson, I.A.
Structure and Receptor Binding of the Hemagglutinin from a Human H6N1 Influenza Virus.
Cell Host Microbe, 17:369-376, 2015

PubMed Abstract: Avian influenza viruses that cause infection and are transmissible in humans involve changes in the receptor binding site (RBS) of the viral hemagglutinin (HA) that alter receptor preference from α2-3-linked (avian-like) to α2-6-linked (human-like) sialosides. A human case of avian-origin H6N1 influenza virus was recently reported, but the molecular mechanisms contributing to it crossing the species barrier are unknown. We find that, although the H6 HA RBS contains D190V and G228S substitutions that potentially promote human receptor binding, recombinant H6 HA preferentially binds α2-3-linked sialosides, indicating no adaptation to human receptors. Crystal structures of H6 HA with avian and human receptor analogs reveal that H6 HA preferentially interacts with avian receptor analogs. This binding mechanism differs from other HA subtypes due to a unique combination of RBS residues, highlighting additional variation in HA-receptor interactions and the challenges in predicting which influenza strains and subtypes can infect humans and cause pandemics.

PubMed: 25766295
DOI: 10.1016/j.chom.2015.02.005

Experimental method

X-RAY DIFFRACTION (2.25 Å)