Involved in regulation of mitochondrial protein translation and respiration. Plays a role in mitochondria-mediated cell death. May act as a scaffolding protein or stabilizer of respiratory chain supercomplexes. Binds GTP. Homodimer or multimer (By similarity). Interacts with mitochondrial complex I, DAP3, MRPL12 and MRPS27. Belongs to the TRAFAC class YlqF/YawG GTPase family. NOA1 subfamily. Truncated N-terminus.