Component of the RIX1 complex required for processing of ITS2 sequences from 35S pre-rRNA and the nucleoplasmic transit of the pre-60S ribosomal subunits (PubMed:21385875). Regulates pre-60S association of the critical remodeling factor mdn1 (By similarity). Also required for heterochromatic gene silencing (PubMed:21385875). Component of the RIX1 complex, composed of ipi1, rix1/ipi2 and crb3/ipi3 in a 1:2:2 stoichiometry. The complex interacts (via rix1) with mdn1 (via its hexameric AAA ATPase ring) and the pre-60S ribosome particles (By similarity). Interacts with crb3/ipi3, gcr3 and Las1 (PubMed:21385875). Belongs to the RIX1/PELP1 family.