E. coli-expressed recombinant norovirus capsid proteins maintain authentic antigenicity and receptor binding...

Area of Science:

• Virology
• Molecular Biology
• Biotechnology

Background:

• Norovirus (NV) capsid proteins are crucial for research in immunology, diagnostics, and host-receptor interactions.
• The baculovirus expression system is commonly used for producing NV capsid proteins that form virus-like particles (VLPs).

Purpose of the Study:

• To evaluate the efficacy of the E. coli expression system for producing recombinant Norovirus capsid proteins.
• To compare the antigenicity and receptor binding properties of E. coli-expressed NV capsid proteins with those produced via baculovirus.
• To characterize the receptor-binding patterns of additional NV strains using the E. coli system.

Main Methods:

• Recombinant Norovirus capsid proteins were produced using an E. coli expression system.
• Antigenicity and receptor binding specificity were assessed and compared to baculovirus-expressed proteins.
• Receptor-binding patterns of three additional NV strains (OIF1998, Parris Island, VA115) were characterized.

Main Results:

• E. coli-expressed NV capsid proteins maintained antigenicity and receptor binding specificity compared to baculovirus-expressed proteins.
• While E. coli-expressed VA387 proteins did not form VLPs, they retained functional properties.
• Specific binding patterns were observed for OIF1998, Parris Island, and VA115 strains, with VA115 showing no specific binding.
• VLP formation was determined to be unnecessary for receptor binding.

Conclusions:

• The E. coli expression system provides a viable and simpler alternative for large-scale production of Norovirus capsid proteins.
• This system is particularly beneficial for NV strains that yield low quantities in insect cell-based baculovirus systems.
• Bacterial expression of NV capsid proteins facilitates research into their immunological and receptor-binding characteristics.