Plays an important positive role in viral symptom development and is required for viral multiplication and pathogenesis. Interacts with the helicase domain of the tobamovirus (TMV) and the tobacco etch virus (TEV) replicases. Expressed in flower buds and flowers. By tunicamycin. No visible phenotype under normal growth conditions, but the mutant plants die rapidly after challenges with the turnip mosaic virus (TuMV) and turnip vein clearing virus (TVCV). The double mutant erdj3b and p58ipk is male gametophytic lethal.