Mitotic spindle-associated protein; microtubule-associate protein (MAP) that inhibits dynein motility along microtubules, acting directly on the motor domain, independent of the dynactin complex; interacts with components of the Dam1 (DASH) complex, its effector Sli15p, and MAP Bim1p; localizes to nuclear microtubules, the mitotic spindle and to the bud neck in a ring-shaped structure