Enables microtubule binding activity. Acts upstream of or within several processes, including epithelial cilium movement involved in extracellular fluid movement; plasma membrane bounded cell projection organization; and stress fiber assembly. Located in several cellular components, including cytoskeleton; lateral wall of outer hair cell; and sperm principal piece. Orthologous to human SPAG6 (sperm associated antigen 6). [provided by Alliance of Genome Resources, Apr 2022]