HBGA binding modes and selectivity in noroviruses upon mutation: a docking and molecular dynamics study

Area of Science:

• Virology
• Structural Biology
• Computational Chemistry

Background:

• Norovirus is the leading cause of viral gastroenteritis and severe diarrhea in children.
• High mutation rates contribute to norovirus drug resistance, hindering therapeutic development.
• Norovirus entry into host cells involves interactions between viral proteins and histo-blood group antigens (HBGAs).

Purpose of the Study:

• To computationally analyze the binding affinity of different norovirus variants to common glycans.
• To investigate the structural basis of norovirus-HBGA interactions and identify potential therapeutic targets.

Main Methods:

• Molecular docking studies were employed to assess binding affinities using docking scores and RMSD values.
• Molecular dynamics simulations were performed to analyze the dynamic behavior of viral protein regions during ligand binding.

Main Results:

• Molecular docking revealed that binding region 1 is preferred by norovirus variants in categories 1-5.
• A significant shift in binding selectivity to region 2 was observed in norovirus variants of category 6.
• Molecular dynamics simulations indicated reduced fluctuation in the blocking loop of region 1 when it is hindered in category 6 variants.

Conclusions:

• Norovirus binding to HBGAs exhibits variant-specific selectivity, with a notable shift towards region 2 in category 6.
• Understanding these binding dynamics offers insights into norovirus-host interactions and potential strategies for antiviral drug design.