May function by interacting with a small, flexible domain located at the C-terminus of the CP, forming a bridge between the virus particle and the internal surface of the vector nematode feeding apparatus. The genome of this virus consists of two linear, positive, single-stranded RNAs encapsidated in separate virions. They are designated RNA-1 and RNA-2. This protein was translated from the RNA-2. Belongs to the tobravirus protein 2b family.