Involved in the control of mitochondrial and peroxisomal division and morphology. In association with PEX11C, PEX11D, PEX11E and FIS1B, is involved in cell cycle-associated constitutive self-replication of preexisting peroxisomes. Homooligomer. Interacts with ARC5 on peroxisomes and ELM1 on mitochondria. Ubiquitous. Preferentially expressed in flowers. Reduced plant growth. Increase in the size of peroxisomes and decrease in the number of peroxisomes per cell. Elongated mitochondria. May be due to an intron retention. Belongs to the TRAFAC class dynamin-like GTPase superfamily. Dynamin/Fzo/YdjA family.