Plays a role in the regulation of the mitochondrial ribosome assembly and of translational activity. Displays GTPase activity. Involved in the ribosome maturation process. 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. Truncated C-terminus.