This domain family is found in bacteria and eukaryotes, and is approximately 50 amino acids in length. The family is found in association with Pfam:PF00271. The yeast mitochondrial degradosome (mtEXO) is an NTP-dependent exoribonuclease involved in mitochondrial RNA metabolism. mtEXO is made up of two subunits: an RNase (DSS1) and an RNA helicase (SUV3). These co-purify with mitochondrial ribosomes.

1: The yeast mitochondrial degradosome. Its composition, interplay between RNA helicase and RNase activities and the role in mitochondrial RNA metabolism. Dziembowski A, Piwowarski J, Hoser R, Minczuk M, Dmochowska A, Siep M, van der Spek H, Grivell L, Stepien PP; J Biol Chem. 2003;278:1603-1611. PMID:12426313