Binds to the C-terminal PTS1-type tripeptide peroxisomal targeting signal (SKL-type) and plays an essential role in peroxisomal protein import. Interacts with PEX12 (By similarity). Interacts with PEX7, PEX13 and PEX14 (PubMed:11865044). Interacts (Cys-linked ubiquitinated) with ZFAND6 (By similarity). Isoform 1 but not isoform 3 interacts with isoform 2 of VWA8 in a PEX7-dependent manner (PubMed:30204880). Its distribution appears to be dynamic. It is probably a cycling receptor found mainly in the cytoplasm and as well associated to the peroxisomal membrane through a docking factor (PEX13). Monoubiquitination at Cys-11 is required for proper export from peroxisomes and recycling. Belongs to the peroxisomal targeting signal receptor family.