6BKQ

Crystal structure of the A/Hong Kong/1/1968 (H3N2) influenza virus hemagglutinin E190D mutant in complex with 6'-SLN

Summary for 6BKQ

• Entry DOI: 10.2210/pdb6bkq/pdb
• Related PRD ID: PRD_900046
• Descriptor: Hemagglutinin, beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose, ... (10 entities in total)
• Functional Keywords: influenza, hemagglutinin, receptor, viral protein
• Biological source: Influenza A virus (strain A/Hong Kong/1/1968 H3N2); More
• Total number of polymer chains: 6
• Total formula weight: 173901.97

Authors

Wu, N.C.,Wilson, I.A. (deposition date: 2017-11-09, release date: 2018-02-28, Last modification date: 2023-10-04)

Primary citation

Wu, N.C.,Thompson, A.J.,Xie, J.,Lin, C.W.,Nycholat, C.M.,Zhu, X.,Lerner, R.A.,Paulson, J.C.,Wilson, I.A.
A complex epistatic network limits the mutational reversibility in the influenza hemagglutinin receptor-binding site.
Nat Commun, 9:1264-1264, 2018

PubMed Abstract: The hemagglutinin (HA) receptor-binding site (RBS) in human influenza A viruses is critical for attachment to host cells, which imposes a functional constraint on its natural evolution. On the other hand, being part of the major antigenic sites, the HA RBS of human H3N2 viruses needs to constantly mutate to evade the immune system. From large-scale mutagenesis experiments, we here show that several of the natural RBS substitutions become integrated into an extensive epistatic network that prevents substitution reversion. X-ray structural analysis reveals the mechanistic consequences as well as changes in the mode of receptor binding. Further studies are necessary to elucidate whether such entrenchment limits future options for immune escape or adversely affect long-term viral fitness.

PubMed: 29593268
DOI: 10.1038/s41467-018-03663-5

Experimental method

X-RAY DIFFRACTION (2.25 Å)