Mitochondrial GTPase involved in mitochondrial trafficking. Probably involved in control of anterograde transport of mitochondria and their subcellular distribution (By similarity). Interacts with the kinesin-binding proteins TRAK1/OIP106 and TRAK2/GRIF1, forming a link between mitochondria and the trafficking apparatus of the microtubules (By similarity). Interacts with ARMCX3 (By similarity). Found in a complex with KIF5B, OGT, RHOT1 and TRAK1 (PubMed:24995978). Colocalizes with MGARP and RHOT2 at the mitochondria. Ubiquitinated by PRKN in a PINK1-dependent manner, leading to its degradation. Belongs to the mitochondrial Rho GTPase family.