Partial glycosylation of the Ibaraki virus NS3 protein is sufficient to support virus propagation

Area of Science:

• Virology
• Cell Biology

Background:

• Ibaraki virus (IBAV) causes Ibaraki disease.
• IBAV NS3 protein is highly glycosylated, and N-linked glycosylation inhibition suppresses viral propagation.
• Tunicamycin, an N-linked glycosylation inhibitor, induces endoplasmic reticulum (ER) stress.

Purpose of the Study:

• To investigate the effects of ER stress and NS3 glycosylation on IBAV infection.
• To determine the relationship between ER stress, NS3 glycosylation, and viral propagation.

Main Methods:

• Utilized tunicamycin and thapsigargin to induce ER stress and inhibit NS3 glycosylation.
• Administered varying concentrations of these reagents to IBAV-infected cells.
• Monitored viral propagation and assessed levels of ER stress and NS3 glycosylation.

Main Results:

• High concentrations of tunicamycin and thapsigargin suppressed IBAV propagation.
• Lower concentrations induced ER stress and NS3 glycosylation inhibition but showed limited impact on viral propagation.
• Moderate ER stress, induced by lower thapsigargin concentrations, enhanced IBAV propagation.

Conclusions:

• Significant NS3 glycosylation inhibition and ER stress induction are required to suppress IBAV propagation.
• Moderate ER stress may be beneficial for IBAV infection, suggesting a complex interplay between host cell stress responses and viral replication.