May be involved in peroxisomal proliferation and may regulate peroxisomes division. May mediate binding of coatomer proteins to the peroxisomal membrane. Promotes membrane protrusion and elongation on the peroxisomal surface. Homodimer. Heterodimer with PEX11G. Probably interacts with COPB2 and COPA. Interacts with PEX19. Interacts with FIS1. Belongs to the peroxin-11 family.