Investigating Protein-Protein Interactions Between Grapevine Leafroll-Associated Virus 3 and Vitis vinifera

Area of Science:

• Plant Pathology
• Molecular Biology
• Virology

Background:

• Grapevine leafroll disease (GLD), primarily caused by Grapevine leafroll-associated virus 3 (GLRaV-3), significantly reduces grape yield and wine quality globally.
• Understanding the molecular mechanisms of GLRaV-3 infection, particularly its interactions with host proteins, is crucial for managing this disease.

Purpose of the Study:

• To identify and characterize protein-protein interactions between GLRaV-3 encoded proteins and proteins from the host plant, Vitis vinifera.
• To elucidate the roles of these interactions in the pathogenesis of GLD and viral spread.

Main Methods:

• A yeast two-hybrid (Y2H) system was employed to screen for interactions between GLRaV-3 proteins and a Vitis vinifera cDNA library.
• Identified interactions were validated using in planta assays.

Main Results:

• Five interacting protein pairs were identified, with three confirmed in planta.
• The GLRaV-3 minor coat protein interacts with 3-deoxy-D-arabino-heptulosonate 7-phosphate synthase 02, affecting carbohydrate metabolism.
• GLRaV-3 p20A interacts with a small heat shock protein and MAP3K epsilon protein kinase 1, both involved in plant stress responses.

Conclusions:

• This research reveals novel interactions between GLRaV-3 proteins and Vitis vinifera proteins, shedding light on viral strategies.
• The identified interactions provide a foundation for understanding GLRaV-3 pathogenesis and developing targeted disease management strategies for GLD.