Mitochondrial outer membrane protein which regulates mitochondrial organization (By similarity). It is required for mitochondrial fission and promotes the recruitment and association of the fission mediator dynamin-related protein 1 (DNM1L) to the mitochondrial surface independently of the mitochondrial fission FIS1 and MFF proteins (By similarity). Regulates DNM1L GTPase activity (By similarity).
Subcellular locations: Mitochondrion outer membrane
Colocalizes with DNM1L at mitochondrial membrane. Forms foci and rings around mitochondria (By similarity).