Exhibits ATPase activity in vitro. Monomer (PubMed:30204880). Isoform 1 and isoform 2 interact with PEX7 (PubMed:30204880). Isoform 2 interacts with isoform 1 of PEX5 in a PEX7-dependent manner (PubMed:30204880). Localizes to peroxisomes in a PEX7-dependent manner. AA 66-79 are essential for peroxisome localization. Extended N-terminus.