Involved in nucleolar processing of pre-18S ribosomal RNA and ribosome assembly. Interacts with snoRNA U3 (PubMed:15590835). Interacts with MPP10 (PubMed:15590835). Component of the ribosomal small subunit (SSU) processome composed of at least 40 protein subunits and snoRNA U3 (PubMed:15590835). Interacts with UBP10 (PubMed:22902402, PubMed:26149687). Present with 3260 molecules/cell in log phase SD medium. Belongs to the NRAP family.