Required for 60S pre-ribosomal subunits export to the cytoplasm. May also be required for 60S ribosomal subunit maturation and accumulation. Involved in G1 events and passage through start, and possibly actin cytoskeleton organization. Associated with the 60S pre-ribosomal particles. Interacts with NAP1. Present with 3640 molecules/cell in log phase SD medium. Belongs to the SDA1 family.