Involved in the positive control of both endoplasmic reticulum (ER) and mitochondrion inheritance during cell divison. Required for the MYO2-dependent retention of newly inherited mitochondria at the bud tip in developing daughter cells (By similarity). Interacts with MYO2 (via C-terminal tail domain). Interacts with YIF1, YIP3, YIP4 and YIP5 (By similarity). Enriched in the peripheral ER of small buds and daughter cells. Concentrates at the site of bud emergence, at the bud tip of the growing bud, and at the bud neck during the M phase. Interaction with MYO2 is required for proper localization to the bud (By similarity). Belongs to the small GTPase superfamily. Rab family.