Members of this family are mitochondrial inner membrane proteins with a role in inner mitochondrial membrane organisation and biogenesis [1].

1: The inner membrane protein Mdm33 controls mitochondrial morphology in yeast. Messerschmitt M, Jakobs S, Vogel F, Fritz S, Dimmer KS, Neupert W, Westermann B; J Cell Biol 2003;160:553-564. PMID:12591915