Acts as a late-stage inhibitor of pre-60S ribosome assembly by preventing pre-60S ribosome export from nucleus. Interacts with 60S ribosome assembly factors GTPBP4 and MRTO4. MINAS-60 is the product of an alternative open reading frame (alt-ORF) of transcripts coding for the RBM10 (AC Q99KG3) protein (PubMed:35393574). MINAS-60 and RBM10 ORFs are overlapping and are formed by shifting the reading frame (PubMed:35393574).