RNA-binding protein that associates with the RNA exosome complex. Involved in the 3'-processing of the 7S pre-RNA to the mature 5.8S rRNA and play a role in recruiting the RNA exosome complex to pre-rRNA; this function may include C1D. Associates with the RNA exosome complex, probably mediated by EXOSC10 (PubMed:29906447). Interacts with ARHGAP18, EXOSC10 and MTREX. Cytoplasmic in M phase. Phosphorylated in M (mitotic) phase. Belongs to the MPP6 family.