Plays essential roles both in the entry of the viral genome into the bacterial host and in budding process. The formation of the G3P-G6P complex termed adsorption complex is essential for correct termination of filamentous phage assembly. Interacts with G3P; this interaction is required for proper integration of G3P and G6P into the virion. Prior to assembly, G6P is found associated with the bacterial host inner membrane. There are about five copies of G6P in the mature virion. They are located together with G3P at the head side of the filamentous virion (By similarity). Belongs to the inovirus G6P protein family.