Microtubule-associated force-producing protein that participates mitochondrial fission. Fission of mitochondria occurs in many cell types and constitutes an important step in mitochondria morphology, which is balanced between fusion and fission. Functions antagonistically with FZO1. GTP + H2O = GDP + H(+) + phosphate Interacts with FIS1 and MDV1. Cytoplasm, localizes to the cytoplasmic outer membrane of mitochondria. The GTPase domain modulates a rate-limiting step in mitochondrial membrane fission. Present with 9600 molecules/cell in log phase SD medium. Belongs to the TRAFAC class dynamin-like GTPase superfamily. Dynamin/Fzo/YdjA family.