Mitochondrial GTPase involved in mitochondrial trafficking (PubMed:16630562, PubMed:22396657). Probably involved in control of anterograde transport of mitochondria and their subcellular distribution (PubMed:22396657). Interacts with the kinesin-binding proteins TRAK1/OIP106 and TRAK2/GRIF1, forming a link between mitochondria and the trafficking apparatus of the microtubules (PubMed:16630562). 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. Ubiquitously expressed. Highly expressed in heart, liver, skeletal muscle, kidney and pancreas. Ubiquitinated by PRKN in a PINK1-dependent manner, leading to its degradation. Belongs to the mitochondrial Rho GTPase family.