Required for 60S ribosomal subunit synthesis. May be involved in assembly reactions occurring within late pre-ribosomal particles. Interacts with NIP7 and RRP43. Together with DBP6, URB1, URB2 and RSA3, forms an RNA-independent complex, which is required during early maturation of nascent 60S ribosomal subunits. Present with 2170 molecules/cell in log phase SD medium.