Putative mitochondrial ATPase. Plays a role in mitochondrial morphology and mitochondrial protein metabolism. Promotes degradation of excess nuclear-encoded complex IV subunits (COX4I1, COX5A and COX6A1) and normal activity of complexes III and IV of the respiratory chain (PubMed:26759378, PubMed:27323408). Mediates mitochondrial translocation of TP53 and its transcription-independent apoptosis in response to genotoxic stress (PubMed:27323408). Found in several complexes of 140-500 kDa. Interacts with YME1L1 (PubMed:26759378). Interacts with COX4I1 (PubMed:26759378). Interacts with COX5A (PubMed:26759378). Interacts with TP53; mediates mitochondrial translocation of TP53 in response to genotoxic stress such as mitomycin C treatment (PubMed:27323408). Belongs to the AFG1 ATPase family.