Binds to the C-terminal PTS1-type tripeptide peroxisomal targeting signal (SKL-type) and plays an essential role in peroxisomal protein import. 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 (By similarity). Ubiquitination at Cys-5 is UBC4-independent but requires the presence of PEX4. Ubiquitination at Lys-17 is UBC4-dependent (By similarity). Belongs to the peroxisomal targeting signal receptor family.