Involved in peroxisomal proliferation. May regulate peroxisome division by recruiting the dynamin-related GTPase DNM1L to the peroxisomal membrane. Promotes membrane protrusion and elongation on the peroxisomal surface. Homodimer. Heterodimer with PEX11G. Interacts with PEX19. Interacts with FIS1. Belongs to the peroxin-11 family.