Protein that assembles into highly ordered structures and provides a specific site for viral DNA replication. Probably anchors the viral DNA replisome to the host membrane. Homomultimer. Self-associates into large complexes forming long filamentous structures. Interacts (via N-terminus) with the primer terminal protein. The hydrophobic C-terminus is involved in the association with the host membrane. The coiled coil region is involved assembly into protofilament sheet structures. Belongs to the phi29likevirus DNA replication protein 1 family.