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 (By similarity). Homodimer or multimer. Interacts with mitochondrial complex I, DAP3, MRPL12 and MRPS27 (By similarity). Belongs to the TRAFAC class YlqF/YawG GTPase family. NOA1 subfamily.