Structural component of the distal-half of the long-tail fiber. The long-tail fiber of T4 is about 1600 Angstroms long with a kink in the middle that divides the fiber into proximal and distal halves. The thin tip of the distal half-fiber interacts with the bacterial lipopolysaccharide receptor and specifies the host range of the phage. The long-tail fibers are trimeric, with a stoichiometry of gp34/gp37/gp36/gp35 of 3:3:3:1. Belongs to the tevenvirinae tail fiber protein p36 family.