Targeting norovirus infection-multivalent entry inhibitor design based on NMR experiments

Area of Science:

• Virology
• Biochemistry
• Medicinal Chemistry

Background:

• Noroviruses utilize histo blood group antigens (HBGAs) for host cell attachment.
• Compounds inhibiting this interaction are valuable for therapeutic and diagnostic applications.

Purpose of the Study:

• To identify and characterize compounds that bind to the norovirus HBGA binding site.
• To develop potent multivalent entry inhibitors against norovirus infections.

Main Methods:

• Nuclear Magnetic Resonance (NMR) binding studies, including Saturation Transfer Difference (STD) NMR, spin-lock filtered NMR, and interligand NOE (ILOE) experiments.
• Utilized virus-like particles (VLPs) to identify ligands binding to the HBGA site.
• Synthesized multivalent prototype entry-inhibitors based on identified compounds.

Main Results:

• NMR studies successfully identified and differentiated binding sites for HBGA ligands and complementary ligands.
• Two multivalent prototype entry-inhibitors were synthesized and tested.
• Surface plasmon resonance assays demonstrated significant avidity gains (1000 to one million fold) compared to univalent ligands.

Conclusions:

• NMR-based screening is effective for identifying compounds that bind to the norovirus HBGA binding site.
• The developed multivalent inhibitors show greatly enhanced binding avidity.
• This strategy facilitates the rational design of potent norovirus entry inhibitors for therapeutic development.