Mitochondrial GTPase that catalyzes the GTP-dependent ribosomal translocation step during translation elongation. During this step, the ribosome changes from the pre-translocational (PRE) to the post-translocational (POST) state as the newly formed A-site-bound peptidyl-tRNA and P-site-bound deacylated tRNA move to the P and E sites, respectively. Catalyzes the coordinated movement of the two tRNA molecules, the mRNA and conformational changes in the ribosome (By similarity). Essential during development as it acts as a retrograde signal from mitochondria to the nucleus to slow down cell proliferation if mitochondrial energy output is low. Protein biosynthesis; polypeptide chain elongation. Larvae are able to survive on maternal contribution until the third larval stage but they fail to initiate the rapid growth phase and die. This protein may be expected to contain an N-terminal transit peptide but none has been predicted. Belongs to the TRAFAC class translation factor GTPase superfamily. Classic translation factor GTPase family. EF-G/EF-2 subfamily.