Evolution of the interactions between GII.4 noroviruses and histo-blood group antigens: Insights from experimental and computational studies

PLoS Pathog. 2021 Jul 12;17(7):e1009745. doi: 10.1371/journal.ppat.1009745. eCollection 2021 Jul.

Abstract

Norovirus (NoV) is the major pathogen causing the outbreaks of the viral gastroenteritis across the world. Among the various genotypes of NoV, GII.4 is the most predominant over the past decades. GII.4 NoVs interact with the histo-blood group antigens (HBGAs) to invade the host cell, and it is believed that the receptor HBGAs may play important roles in selecting the predominate variants by the nature during the evolution of GII.4 NoVs. However, the evolution-induced changes in the HBGA-binding affinity for the GII.4 NoV variants and the mechanism behind the evolution of the NoV-HBGA interactions remain elusive. In the present work, the virus-like particles (VLPs) of the representative GII.4 NoV stains epidemic in the past decades were expressed by using the Hansenula polymorpha yeast expression platform constructed by our laboratory, and then the enzyme linked immunosorbent assay (ELISA)-based HBGA-binding assays as well as the molecular dynamics (MD) simulations combined with the molecular mechanics/generalized born surface area (MMGBSA) calculations were performed to investigate the interactions between various GII.4 strains and different types of HBGAs. The HBGA-binding assays show that for all the studied types of HBGAs, the evolution of GII.4 NoVs results in the increased NoV-HBGA binding affinities, where the early epidemic strains have the lower binding activity and the newly epidemic strains exhibit relative stronger binding intensity. Based on the MD simulation and MMGBSA calculation results, a physical mechanism that accounts for the increased HBGA-binding affinity was proposed. The evolution-involved residue mutations cause the conformational rearrangements of loop-2 (residues 390-396), which result in the narrowing of the receptor-binding pocket and thus tighten the binding of the receptor HBGAs. Our experimental and computational studies are helpful for better understanding the mechanism behind the evolution-induced increasing of HBGA-binding affinity, which may provide useful information for the drug and vaccine designs against GII.4 NoVs.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Blood Group Antigens / metabolism*
  • Host-Parasite Interactions / physiology*
  • Humans
  • Molecular Docking Simulation
  • Norovirus / genetics
  • Norovirus / metabolism*
  • Virus Attachment

Substances

  • Blood Group Antigens

Grants and funding

This work was supported by the grant from the Major Project of National Science and Technology of China on New Drug Creation and Development to Q.M.L. (2018ZX09739002). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.