K88 minor fimbrial subunit, plays an essential role in the biogenesis of the K88 fimbriae. Fimbriae (also called pili), are polar filaments radiating from the surface of the bacterium to a length of 0.5-1.5 micrometers and numbering 100-300 per cell. They enable bacteria to colonize the epithelium of specific host organs. Located in or along the K88 fimbrial structure.