Scaffolding protein and protease involved in the icosahedric procapsid assembly. Coassembles with the capsid proteins to form the procapsid, in which the scaffolding protein is found within the external shell of icosahedrally arranged capsid protein subunits. In a subsequent step the scaffolding protein molecules are cleaved by the viral protease activity. Homomultimer. Autocleaves itself into an N-terminal fragment containing the protease activity, that remains in the capsid following maturation. Belongs to the P2likevirus scaffolding protein family.