Enables microtubule binding activity. Acts upstream of or within microtubule cytoskeleton organization. Located in several cellular components, including cytoskeleton; smooth endoplasmic reticulum; and sperm midpiece. Part of microtubule associated complex. Is expressed in retina inner plexiform layer and spinal cord. Orthologous to human GABARAP (GABA type A receptor-associated protein). [provided by Alliance of Genome Resources, Apr 2022]