Promotes tail assembly by creating a scaffold for the tail tube proteins. The tail assembly proteins Gp24 and Gp25 would wrap the linear tape measure protein to create a tail assembly scaffold. It would allow polymerization of tail tube protein during which Gp24 and Gp25 are released and therefore are absent from the mature virion. The tail assembly protein Gp25 is produced by a rare -1 ribosomal frameshift. The ratio Gp24/Gp25 is important for proper tail assembly. Interacts with tail assembly protein Gp24 and tape measure protein. A readthrough event might also occur in addition to the frameshifting event. Produced by -1 ribosomal frameshifting. Belongs to the L5likevirus tail assembly protein family.