Structural component of the distal-half tail fiber. It constitutes the part of the long tail fibers that recognizes the bacterial receptor (By similarity). The distal half-fiber contains two molecules each of Gp36 and Gp37 and one molecule of Gp35. The two Gp37 protein chains run in parallel, the length of the distal half-fiber, with the amino end near the center kink of the fiber and the carboxyl end at the distal tip. The other polypeptides are distributed uniformly along the length of the distal half-fiber. Belongs to the tail fiber family.