Plays a role in the regulation of the mitochondrial ribosome assembly and of translational activity. Displays GTPase activity. Involved in the ribosome maturation process (By similarity). Associates with the mitochondrial ribosome large subunit; the association occurs in a GTP-dependent manner. Belongs to the TRAFAC class OBG-HflX-like GTPase superfamily. OBG GTPase family.