ATP-dependent chaperone, which plays an essential role in the cytoplasmic maturation steps of pre-60S ribosomal particles by promoting the release of shuttling protein RSL24D1/RLP24 from the pre-ribosomal particles. Acts together with SPATA5, C1orf109 ortholog and CINP. ATP + H2O = ADP + H(+) + phosphate Associates with pre-60S ribosomal particles. Interacts with C1orf109 ortholog. In adult ear, expressed at low levels in neurosensory hair cells (inner and outer) and supporting cells (pillar and Deiter cells). Belongs to the AAA ATPase family. AFG2 subfamily.