RNA-binding ribosome assembly factor; constituent of early pre-60S particles; genetically and physically linked to most NOP8 60s ribosome pre-assembly complex members and to ribosomal protein Rpl3p; contains two independent RNA-interacting domains; associates with helix H95 in 3' region of 25S rRNA, in close proximity to binding sites of Npa1p and Rpl3p; interacts with several snoRNAs